Honda Civic OBD2 Codes List: Your Comprehensive Guide to Diagnostic Trouble Codes

Navigating car troubles can be frustrating, especially when your Honda Civic’s check engine light illuminates. The On-Board Diagnostics system, or OBD2, is your car’s built-in self-diagnostic system, and it communicates potential issues through standardized Diagnostic Trouble Codes (DTCs). Understanding these Honda Civic OBD2 codes is the first step towards effective vehicle maintenance and repair.

This comprehensive guide provides an extensive Honda Civic Obd2 Codes List, helping you decipher what your car is trying to tell you. Whether you’re a seasoned mechanic or a Honda Civic owner looking to understand your vehicle better, this list will serve as a valuable resource. We’ll break down the codes by category, offering clear descriptions to help you pinpoint potential problems and take informed action.

Understanding Honda Civic OBD2 Codes: A Detailed List

OBD2 codes are five-digit alphanumeric codes. The first character indicates the system:

P – Powertrain (Engine and Transmission)
B – Body (Body control modules)
C – Chassis (Braking and suspension systems)
U – Network & Vehicle Integration (Communication)

The second character specifies the code type:

0 – Generic (SAE standardized codes)
1, 2, 3 – Manufacturer specific (Enhanced codes)

The third character indicates the subsystem:

1 – Fuel and Air Metering
2 – Fuel and Air Metering – Injector Circuit
3 – Ignition System or Misfire
4 – Auxiliary Emission Controls
5 – Vehicle Speed Controls and Idle Control System
6 – Computer Output Circuit
7, 8 – Transmission

The fourth and fifth characters are specific fault indicators.

Let’s dive into the Honda Civic OBD2 codes list, categorized for easier navigation:

P0000 – P0099: Fuel and Air Metering

These codes often relate to issues with the air-fuel mixture, which is crucial for engine performance and emissions.

P0010 – Variable Valve Timing Control (VTC) Oil Control Solenoid Valve Malfunction: Indicates a problem with the VTC solenoid valve circuit, affecting engine timing and efficiency.
P0011 – Variable Valve Timing Control (VTC) System Malfunction: Signifies a general issue with the VTC system, potentially affecting engine performance and fuel economy.

P0100 – P0199: Fuel and Air Metering (MAF, MAP, IAT Sensors)

These codes are related to sensors that measure air flow, pressure, and temperature, all vital for correct fuel delivery.

P0101 – Mass Airflow (MAF) Sensor Range/Performance Problem: The MAF sensor signal is out of expected range, which can lead to incorrect air-fuel mixture.
P0102 – Mass Airflow (MAF) Sensor Circuit Low Voltage: Low voltage detected in the MAF sensor circuit, potentially due to wiring or sensor issues.
P0103 – Mass Airflow (MAF) Sensor Circuit High Voltage: High voltage in the MAF sensor circuit, indicating a possible short or sensor malfunction.
P0106 – Manifold Absolute Pressure (MAP) Sensor Range/Performance Problem: MAP sensor reading is outside the expected range, affecting fuel delivery and potentially causing rough idling or poor performance.
P0107 – Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage: Low voltage detected in the MAP sensor circuit, potentially due to wiring or sensor issues.
P0108 – Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage: High voltage in the MAP sensor circuit, indicating a possible short or sensor malfunction.
P0111 – Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem: IAT sensor reading is out of expected range, which can affect fuel calculations, especially in varying temperatures.
P0112 – Intake Air Temperature (IAT) Sensor Circuit Low Voltage: Low voltage in the IAT sensor circuit, possibly due to wiring or sensor issues.
P0113 – Intake Air Temperature (IAT) Sensor Circuit High Voltage: High voltage in the IAT sensor circuit, indicating a potential short or sensor malfunction.
P0116 – Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance Problem: ECT sensor reading is outside the expected range, affecting engine temperature monitoring and fuel mixture adjustments.
P0117 – Engine Coolant Temperature (ECT) Sensor Circuit Low Input: Low voltage from the ECT sensor, suggesting a possible short or sensor issue.
P0118 – Engine Coolant Temperature (ECT) Sensor Circuit High Input: High voltage from the ECT sensor, indicating a potential open circuit or sensor malfunction.
P0122 – Throttle Position (TP) Sensor Circuit Low Input: Low voltage from the TP sensor, which could cause idle issues or poor acceleration.
P0123 – Throttle Position (TP) Sensor Circuit High Input: High voltage from the TP sensor, potentially leading to high idle or engine surging.
P0125 – Engine Coolant Temperature (ECT) Sensor Slow Response: ECT sensor is not responding quickly enough to temperature changes, affecting fuel control during warm-up.
P0128 – Cooling System Malfunction: General cooling system issue detected, which could range from thermostat problems to radiator issues.
P0191 – Fuel Pressure Sensor Range/Performance Problem: Fuel pressure sensor reading is out of the expected range, affecting fuel delivery and potentially causing engine performance issues.
P0192 – Fuel Pressure Sensor Circuit Low Voltage: Low voltage in the fuel pressure sensor circuit, potentially due to wiring or sensor issues.
P0193 – Fuel Pressure Sensor Circuit High Voltage: High voltage in the fuel pressure sensor circuit, indicating a possible short or sensor malfunction.
P0196 – Engine Oil Temperature (EOT) Sensor/Range Performance Problem: EOT sensor reading is out of range, affecting engine oil temperature monitoring.
P0197 – Engine Oil Temperature (EOT) Sensor Circuit Low Voltage: Low voltage in the EOT sensor circuit, potentially due to wiring or sensor issues.
P0198 – Engine Oil Temperature (EOT) Sensor Circuit High Voltage: High voltage in the EOT sensor circuit, indicating a possible short or sensor malfunction.

P0130 – P0169: Oxygen Sensor and Air/Fuel Ratio Sensor Codes

These codes deal with sensors that measure oxygen levels in the exhaust, crucial for emissions control and fuel efficiency.

P0131 – Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Circuit Low Voltage: Low voltage from the primary oxygen sensor (upstream), indicating a lean condition or sensor issue.
P0132 – Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Circuit High Voltage: High voltage from the primary oxygen sensor, suggesting a rich condition or sensor problem.
P0133 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Circuit Slow Response: Slow response from the rear air/fuel ratio sensor, affecting emissions control and potentially fuel trim.
P0134 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) No Activity Detected: No signal from the air/fuel ratio sensor, indicating a sensor failure or circuit issue.
P0135 – Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Heater Circuit Malfunction: Problem with the heater circuit of the primary oxygen sensor, affecting sensor warm-up and accuracy.
P0137 – Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit Low Voltage: Low voltage from the secondary oxygen sensor (downstream), indicating a lean condition or sensor issue.
P0138 – Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit High Voltage: High voltage from the secondary oxygen sensor, suggesting a rich condition or sensor problem.
P0139 – Secondary Heated Oxygen Sensor (Secondary HO2S) Slow Response: Slow response from the secondary oxygen sensor, affecting catalytic converter monitoring.
P0141 – Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) Heater Circuit Malfunction: Problem with the heater circuit of the secondary oxygen sensor.
P0143 – Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit Low Voltage: Low voltage from the third oxygen sensor (if applicable).
P0144 – Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit High Voltage: High voltage from the third oxygen sensor (if applicable).
P0145 – Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit Slow Response: Slow response from the third oxygen sensor (if applicable).
P0147 – Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Heater Circuit Malfunction: Problem with the heater circuit of the third oxygen sensor (if applicable).
P0153 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Circuit Slow Response: Slow response from the front air/fuel ratio sensor on Bank 2.
P0154 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater System Malfunction: Problem with the heater system of the front air/fuel ratio sensor on Bank 2.
P0155 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater Circuit Malfunction: Problem with the heater circuit of the front air/fuel ratio sensor on Bank 2.
P0157 – Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit Low Voltage: Low voltage from the front secondary oxygen sensor on Bank 2.
P0158 – Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit High Voltage: High voltage from the front secondary oxygen sensor on Bank 2.
P0159 – Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit Slow Response: Slow response from the front secondary oxygen sensor on Bank 2.
P0161 – Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Heater Circuit Malfunction: Problem with the heater circuit of the front secondary oxygen sensor on Bank 2.

P0170 – P0190: Fuel Trim and System Lean/Rich Codes

These codes indicate issues with the overall fuel mixture being too lean or too rich.

P0171 – Fuel System Too Lean: Engine is running lean, meaning there’s too much air and not enough fuel in the mixture. This can be caused by vacuum leaks, fuel delivery issues, or sensor problems.
P0172 – Fuel System Too Rich: Engine is running rich, meaning there’s too much fuel and not enough air in the mixture. This can be due to faulty injectors, fuel pressure regulator problems, or sensor issues.
P0174 – Front Bank (Bank 2) Fuel System Too Lean: Fuel system on Bank 2 is running lean.
P0175 – Front Bank (Bank 2) Fuel System Too Rich: Fuel system on Bank 2 is running rich.

P0200 – P0299: Injector Circuit & Throttle Position Sensor

These codes are related to fuel injectors and the throttle position sensor, which controls engine power.

P0222 – Throttle Position (TP) Sensor 2 Circuit Low Voltage: Low voltage from the secondary TP sensor, potentially causing issues with electronic throttle control.
P0223 – Throttle Position (TP) Sensor 2 Circuit High Voltage: High voltage from the secondary TP sensor, possibly leading to problems with electronic throttle control.

P0300 – P0399: Misfire and Ignition System Codes

Misfire codes indicate that one or more cylinders are not firing correctly, leading to rough running and potential engine damage.

P0300 – Random Misfire: Misfire detected in multiple cylinders or the system cannot determine which cylinder is misfiring.
P0301 – No. 1 Cylinder Misfire: Misfire detected in cylinder number 1.
P0302 – No. 2 Cylinder Misfire: Misfire detected in cylinder number 2.
P0303 – No. 3 Cylinder Misfire: Misfire detected in cylinder number 3.
P0304 – No. 4 Cylinder Misfire: Misfire detected in cylinder number 4.
P0305 – No. 5 Cylinder Misfire: Misfire detected in cylinder number 5 (if applicable).
P0306 – No. 6 Cylinder Misfire: Misfire detected in cylinder number 6 (if applicable).
P0325 – Knock Sensor Circuit Malfunction: Problem with the knock sensor circuit, which can affect the engine’s ability to detect and prevent detonation.

P0330 – P0399: Crankshaft and Camshaft Position Sensor Codes

These sensors are critical for engine timing and synchronization.

P0335 – Crankshaft Position (CKP) Sensor Circuit No Signal: No signal from the crankshaft position sensor, which will usually prevent the engine from starting.
P0336 – P0339 Crankshaft Position (CKP) Sensor Circuit Intermittent Interruption: Intermittent signal from the crankshaft position sensor, potentially causing stalling or rough running.
P0340 – Camshaft Position (CMP) Sensor No Signal: No signal from the camshaft position sensor, which can cause starting issues or poor performance.
P0341 – Camshaft Position (CMP) Sensor A Intermittent Interruption: Intermittent signal from camshaft position sensor A.
P0341 – Variable Valve Timing Control (VTC) Phase Gap: Problem with the VTC system related to camshaft position.
P0344 – Camshaft Position (CMP) Sensor Intermittent Interruption: Intermittent signal from the camshaft position sensor.
P0365 – Camshaft Position (CMP) Sensor B No Signal: No signal from camshaft position sensor B (if applicable).
P0366 – P0369 Camshaft Position (CMP) Sensor B Intermittent Interruption: Intermittent signal from camshaft position sensor B (if applicable).
P0385 – Crankshaft Position (CKP) Sensor B No Signal: No signal from crankshaft position sensor B (if applicable).
P0389 – Crankshaft Position (CKP) Sensor B Intermittent Interruption: Intermittent signal from crankshaft position sensor B (if applicable).

P0400 – P0499: Emission Control System Codes (EGR, EVAP, Air Injection)

These codes relate to various emission control systems designed to reduce pollutants.

P0401 – Exhaust Gas Recirculation (EGR) Insufficient Flow: Insufficient EGR flow, which can increase NOx emissions and affect engine performance.
P0404 – Exhaust Gas Recirculation (EGR) Control Circuit Range/Performance Problem: Problem with the EGR control circuit, affecting EGR system operation.
P0406 – Exhaust Gas Recirculation (EGR) Valve Position Sensor Circuit High Voltage: High voltage from the EGR valve position sensor, indicating a possible sensor or wiring issue.
P0410 – Air Pump Circuit Malfunction: Problem with the secondary air injection system, which helps reduce emissions during cold starts.
P0411 – Secondary Air Injection System Incorrect Flow: Incorrect flow in the secondary air injection system.
P0420 – Catalyst System Efficiency Below Threshold: Catalytic converter efficiency is below the required level, indicating a potential catalytic converter failure or upstream emission issues.
P0430 – Front Bank Catalyst System Efficiency Below Threshold (Bank 2): Catalytic converter efficiency on Bank 2 is below threshold.
P0441 – Evaporative Emission (EVAP) Control System Incorrect Purge Flow: Incorrect purge flow in the EVAP system, which manages fuel vapors to prevent them from escaping into the atmosphere.
P0442 – Evaporative Emission (EVAP) System Small Leak Detected: Small leak detected in the EVAP system.
P0443 – Evaporative Emission (EVAP) Canister Purge Valve Circuit Malfunction: Problem with the EVAP canister purge valve circuit.
P0451 – Fuel Tank Pressure (FTP) Sensor Range/Performance Problem: FTP sensor reading is out of range, affecting EVAP system monitoring.
P0452 – Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage: Low voltage in the FTP sensor circuit.
P0453 – Fuel Tank Pressure (FTP) Sensor Circuit High Voltage: High voltage in the FTP sensor circuit.
P0456 – Evaporative Emission (EVAP) System Very Small Leak Detected: Very small leak detected in the EVAP system.
P0457 – Evaporative Emission (EVAP) System Leak Detected Fuel Fill Cap Loose/Off: Leak detected in the EVAP system, often caused by a loose or missing fuel cap.
P0461 – Fuel Gauge Sending Unit Range/Performance Problem: Fuel level sensor reading is out of range.
P0462 – Fuel Gauge Sending Unit Circuit Low Voltage: Low voltage in the fuel level sensor circuit.
P0463 – Fuel Gauge Sending Unit Circuit High Voltage: High voltage in the fuel level sensor circuit.
P0496 – Evaporative Emission (EVAP) System High Purge Flow: High purge flow in the EVAP system.
P0497 – Evaporative Emission (EVAP) System Low Purge Flow: Low purge flow in the EVAP system.
P0498 – Evaporative Emission (EVAP) Canister Vent Shut Valve Control Circuit Low Voltage: Low voltage in the EVAP canister vent shut valve control circuit.
P0499 – Evaporative Emission (EVAP) Canister Vent Shut Valve Control Circuit High Voltage: High voltage in the EVAP canister vent shut valve control circuit.

P0500 – P0599: Vehicle Speed, Idle Control, and Auxiliary Inputs

These codes cover vehicle speed sensing, idle control systems, and other auxiliary inputs.

P0500 – Vehicle Speed Sensor (VSS) Circuit Malfunction: Problem with the vehicle speed sensor circuit, which can affect speedometer operation, transmission shifting, and cruise control.
P0501 – Vehicle Speed Sensor (VSS) Range/Performance Problem: VSS signal is out of range.
P0505 – Idle Control System Malfunction: General problem with the idle control system, potentially causing unstable idle speed.
P0506 – Idle Control System RPM Lower Than Expected: Engine idle speed is lower than the target RPM.
P0507 – Idle Control System RPM Higher Than Expected: Engine idle speed is higher than the target RPM.
P0511 – Idle Air Control (IAC) Valve Circuit Malfunction: Problem with the IAC valve circuit, which controls idle speed.
P0521 – Engine Oil Pressure (EOP) Sensor Range/Performance Problem: EOP sensor reading is out of range.
P0522 – Engine Oil Pressure (EOP) Sensor Circuit Low Voltage: Low voltage in the EOP sensor circuit.
P0523 – Engine Oil Pressure (EOP) Sensor Circuit High Voltage: High voltage in the EOP sensor circuit.
P0560 – ECM Back-up Circuit Low Voltage: Low voltage in the ECM backup circuit, which can affect memory retention in the engine control module.
P0563 – Engine Control Module (ECM)/Powertrain Control Module (PCM) Power Source Circuit Unexpected Voltage: Unexpected voltage in the ECM/PCM power source circuit.

P0600 – P0699: Computer/Output Circuit Malfunctions

These codes indicate problems with the vehicle’s computer modules or their output circuits.

P0600 – Multiplex Control System Troubleshooting: General issue with the multiplex communication system, which can affect communication between different modules.
P0603 – ECM/PCM Internal Control Module Keep Alive Memory (KAM) Error: Error in the ECM/PCM’s KAM, which stores learned values and settings.
P0606 – ECM/PCM Processor Malfunction: Internal processor malfunction within the ECM/PCM, potentially requiring module replacement.
P0661 – Intake Manifold Runner Control (IMRC) Valve Position Sensor Circuit Low Voltage: Low voltage in the IMRC valve position sensor circuit.
P0662 – Intake Manifold Runner Control (IMRC) Valve Position Sensor Circuit High Voltage: High voltage in the IMRC valve position sensor circuit.
P0685 – ECM/PCM Power Relay Control Circuit Malfunction: Problem with the ECM/PCM power relay control circuit.

P0700 – P0999: Transmission Codes

These codes are specific to automatic transmission issues.

P0700 – Automatic Transmission Control System: General transmission control system fault. Requires further diagnosis of the transmission control module.
P0705 – Short in Transmission Range Switch Circuit (Multiple Shift-position Input): Short circuit in the transmission range switch, indicating incorrect gear position readings.
P0706 – Open in Transmission Range Switch Circuit: Open circuit in the transmission range switch.
P0710 – P0711 Problem in ATF Temperature Sensor Circuit: Problem with the automatic transmission fluid temperature sensor circuit.
P0712 – Short in ATF Temperature Sensor Circuit: Short circuit in the ATF temperature sensor.
P0713 – Open in ATF Temperature Sensor Circuit: Open circuit in the ATF temperature sensor.
P0715 – P0716 Problem in Mainshaft Speed Sensor Circuit: Problem with the mainshaft speed sensor circuit.
P0717 – Problem in Mainshaft Speed Sensor Circuit (No Signal Input): No signal from the mainshaft speed sensor.
P0718 – Mainshaft Speed Sensor Intermittent Failure: Intermittent failure of the mainshaft speed sensor.
P0720 – Countershaft Speed Sensor Circuit Malfunction: Malfunction in the countershaft speed sensor circuit.
P0720 – P0721 Problem in Countershaft Speed Sensor Circuit: Problem with the countershaft speed sensor circuit.
P0722 – Problem in Countershaft Speed Sensor Circuit (No Signal Input): No signal from the countershaft speed sensor.
P0723 – Countershaft Speed Sensor Intermittent Failure: Intermittent failure of the countershaft speed sensor.
P0725 – Engine Speed Input Circuit Malfunction: Problem with the engine speed input to the transmission control module.
P0730 – Problem in Shift Control System: General problem with the transmission shift control system.
P0731 – Problem in 1st Clutch and 1st Clutch Hydraulic Circuit: Problem with the 1st gear clutch or hydraulic circuit.
P0732 – Problem in 2nd Clutch and 2nd Clutch Hydraulic Circuit: Problem with the 2nd gear clutch or hydraulic circuit.
P0733 – Problem in 3rd Clutch and 3rd Clutch Hydraulic Circuit: Problem with the 3rd gear clutch or hydraulic circuit.
P0734 – Problem in 4th Clutch and 4th Clutch Hydraulic Clutch: Problem with the 4th gear clutch or hydraulic circuit.
P0735 – Problem in 5th Clutch and 5th Clutch Hydraulic Circuit: Problem with the 5th gear clutch or hydraulic circuit (if applicable).
P0740 – Problem in Lock-up Control System: Problem with the torque converter lock-up control system.
P0741 – Torque Converter Clutch Hydraulic Clutch Stuck OFF: Torque converter clutch is stuck in the OFF position.
P0743 – Problem in Torque Converter Clutch Solenoid Valve Circuit: Problem with the torque converter clutch solenoid valve circuit.
P0745 – Problem in Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve A Circuit: Problem with the hydraulic control of clutch pressure solenoid valve A.
P0746 – A/T Clutch Pressure Control Solenoid Valve A Stuck OFF: Clutch pressure control solenoid valve A is stuck OFF.
P0747 – A/T Clutch Pressure Control Solenoid Valve A Stuck ON: Clutch pressure control solenoid valve A is stuck ON.
P0748 – Problem in A/T Clutch Pressure Control Solenoid Valve A Circuit: Problem with the circuit of clutch pressure control solenoid valve A.
P0750 – Problem in Hydraulic Control System of Shift Solenoid Valve A Circuit: Problem with the hydraulic control of shift solenoid valve A.
P0751 – Shift Solenoid Valve A Stuck OFF: Shift solenoid valve A is stuck OFF.
P0752 – Shift Solenoid Valve A Stuck ON: Shift solenoid valve A is stuck ON.
P0753 – Problem in Shift Solenoid Valve A Circuit: Problem with the circuit of shift solenoid valve A.
P0756 – Shift Solenoid Valve B Stuck OFF: Shift solenoid valve B is stuck OFF.
P0757 – Shift Solenoid Valve B Stuck ON: Shift solenoid valve B is stuck ON.
P0758 – Problem in Shift Solenoid Valve B Circuit: Problem with the circuit of shift solenoid valve B.
P0761 – Shift Solenoid Valve C Stuck OFF: Shift solenoid valve C is stuck OFF.
P0762 – Shift Solenoid Valve C Stuck ON: Shift solenoid valve C is stuck ON.
P0763 – Problem in Shift Solenoid Valve C Circuit: Problem with the circuit of shift solenoid valve C.
P0771 – Shift Solenoid Valve E Stuck OFF: Shift solenoid valve E is stuck OFF (if applicable).
P0773 – Problem in Shift Solenoid Valve E Circuit: Problem with the circuit of shift solenoid valve E (if applicable).
P0775 – Problem in the Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve B Circuit: Problem with hydraulic control of clutch pressure solenoid valve B.
P0776 – A/T Clutch Pressure Control Solenoid Valve B Stuck OFF: Clutch pressure control solenoid valve B is stuck OFF.
P0777 – A/T Clutch Pressure Control Solenoid Valve B Stuck ON: Clutch pressure control solenoid valve B is stuck ON.
P0778 – Problem in A/T Clutch Pressure Control Solenoid Valve B Circuit: Problem with the circuit of clutch pressure control solenoid valve B.
P0780 – Problem in Shift Control System: General shift control system problem.
P0795 – Problem in Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve C Circuit: Problem with hydraulic control of clutch pressure solenoid valve C.
P0796 – A/T Clutch Pressure Control Solenoid Valve C Stuck OFF: Clutch pressure control solenoid valve C is stuck OFF.
P0797 – A/T Clutch Pressure Control Solenoid Valve C Stuck ON: Clutch pressure control solenoid valve C is stuck ON.
P0798 – Problem in A/T Clutch Pressure Control Solenoid Valve C Ciruit: Problem with the circuit of clutch pressure control solenoid valve C.
P0812 – Open in Transmission Range Switch ATP RVS Switch Circuit: Open circuit in the transmission range switch for the reverse position.
P0842 – Short in 2nd Clutch Transmission Fluid Pressure Switch Clutch, or 2nd Clutch Transmission Fluid Pressure Switch (Clutch) Stuck ON: Short circuit or stuck ON condition of the 2nd clutch fluid pressure switch.
P0843 – Open in 2nd Clutch Transmission Fluid Pressure Switch Circuit, or 2nd Clutch Transmission Fluid Pressure Switch Stuck OFF: Open circuit or stuck OFF condition of the 2nd clutch fluid pressure switch.
P0845 – Problem in 3rd Clutch Pressure Switch Circuit: Problem with the 3rd clutch pressure switch circuit.
P0847 – Short in 3rd Clutch Transmission Fluid Pressure Switch Circuit, or 3rd Clutch Transmission Fluid Pressure Switch Stuck ON: Short circuit or stuck ON condition of the 3rd clutch fluid pressure switch.
P0848 – Open in 3rd Clutch Transmission Fluid Pressure Switch Circuit, or 3rd Clutch Transmission Fluid Pressure Switch Stuck OFF: Open circuit or stuck OFF condition of the 3rd clutch fluid pressure switch.
P0872 – Short in 4th Clutch Transmission Fluid Pressure Switch Circuit, or 4th Clutch Transmission Fluid Pressure Switch Stuck ON: Short circuit or stuck ON condition of the 4th clutch fluid pressure switch.
P0873 – Open in 4th Clutch Transmission Fluid Pressure Switch Circuit, or 4th Clutch Transmission Fluid Pressure Switch Stuck OFF: Open circuit or stuck OFF condition of the 4th clutch fluid pressure switch.
P0962 – Problem in A/T Clutch Pressure Control Solenoid Valve A Circuit: Problem with the circuit of clutch pressure control solenoid valve A.
P0963 – Problem in A/T Clutch Pressure Control Solenoid Valve A: General problem with clutch pressure control solenoid valve A.
P0966 – Problem in A/T Clutch Pressure Control Solenoid Valve B Circuit: Problem with the circuit of clutch pressure control solenoid valve B.
P0967 – Problem in A/T Clutch Pressure Control Solenoid Valve B: General problem with clutch pressure control solenoid valve B.
P0970 – Problem in A/T Clutch Pressure Control Solenoid Valve C Circuit: Problem with the circuit of clutch pressure control solenoid valve C.
P0971 – Problem in A/T Clutch Pressure Control Solenoid Valve C: General problem with clutch pressure control solenoid valve C.
P0973 – Short in Shift Solenoid Valve A Circuit: Short circuit in shift solenoid valve A.
P0974 – Open in Shift Solenoid Valve A Circuit: Open circuit in shift solenoid valve A.
P0976 – Short in Shift Solenoid Valve B Circuit: Short circuit in shift solenoid valve B.
P0977 – Open in Shift Solenoid Valve B Circuit: Open circuit in shift solenoid valve B.
P0979 – Short in Shift Solenoid Valve C Circuit: Short circuit in shift solenoid valve C.
P0980 – Open in Shift Solenoid Valve C Circuit: Open circuit in shift solenoid valve C.
P0982 – Short in Shift Solenoid Valve D Circuit: Short circuit in shift solenoid valve D (if applicable).
P0983 – Open in Shift Solenoid Valve D Circuit: Open circuit in shift solenoid valve D (if applicable).
P0985 – Short in Shift Solenoid Valve E Circuit: Short circuit in shift solenoid valve E (if applicable).
P0986 – Open in Shift Solenoid Valve E Circuit: Open circuit in shift solenoid valve E (if applicable).

P1000 – P1099 & P1100 – P1299: Manufacturer Specific Codes (Fuel/Air & VTEC)

These codes are Honda specific and often relate to enhanced systems or specific Honda technologies.

P1020 – Valve Pause System Stuck Off: Problem with the valve pause system being stuck OFF.
P1021 – Valve Pause System Stuck On: Problem with the valve pause system being stuck ON.
P1025 – Valve Pause System Sticking Off: Valve pause system is sticking in the OFF position.
P1026 – Valve Pause System Sticking On: Valve pause system is sticking in the ON position.
P1077 – Intake Manifold Runner Control (IMRC) System Malfunction (Low rpm): IMRC system malfunction at low RPM.
P1078 – Intake Mainfold Runner Control (IMRC) System Malfunction (High rpm): IMRC system malfunction at high RPM.
P1106 – Barometric Pressure (BARO) Sensor Circuit Range/Performance Problem: BARO sensor reading is out of range.
P1107 – Barometric Pressure (BARO) Sensor Circuit Low Voltage: Low voltage in the BARO sensor circuit.
P1108 – Barometric Pressure (BARO) Sensor Circuit High Voltage: High voltage in the BARO sensor circuit.
P1121 – Throttle Position (TP) Sensor Lower Than Expected: TP sensor reading is lower than expected.
P1122 – Throttle Position (TP) Sensor Higher Than Expected: TP sensor reading is higher than expected.
P1128 – Manifold Absolute Pressure (MAP) Sensor Circuit Lower Than Expected: MAP sensor reading is lower than expected.
P1129 – Manifold Absolute Pressure (MAP) Sensor Circuit Higher Than Expected: MAP sensor reading is higher than expected.
P1130 – Demand for Changing Both Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) and Third Heated Oxygen Sensor (Third HO2S) (Sensor 3): Request to change both secondary and third oxygen sensors.
P1149 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem: Air/Fuel ratio sensor performance issue.
P1149 – Air/Fuel Ratio Sensor (Sensor 1) Circuit Lean Range: Air/Fuel ratio sensor indicating a lean condition.
P1157 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS Line High Voltage: High voltage on the AFS line of the air/fuel ratio sensor.
P1157 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Circuit High Voltage: High voltage in the air/fuel ratio sensor circuit.
P1157 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem: Air/Fuel ratio sensor performance issue.
P1158 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS- Terminal Low Voltage: Low voltage on the AFS- terminal of the air/fuel ratio sensor.
P1159 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS+ Terminal Low Voltage: Low voltage on the AFS+ terminal of the air/fuel ratio sensor.
P1162 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Slow Response: Slow response from the air/fuel ratio sensor.
P1163 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Slow Response: Slow response from the air/fuel ratio sensor.
P1163 – Air/Fuel Ratio Sensor (Sensor 1) Slow Response: Slow response from the air/fuel ratio sensor.
P1164 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem: Air/Fuel ratio sensor performance issue.
P1164 – Air/Fuel Ratio (AF) Sensor (Sensor 1) Circuit Range/Performance: Air/Fuel ratio sensor circuit performance issue.
P1165 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem: Air/Fuel ratio sensor performance issue.
P1165 – Air/Fuel Ratio Sensor (Sensor 1) Circuit Range/Performance: Air/Fuel ratio sensor circuit performance issue.
P1166 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Heater System Electrical Problem: Electrical problem in the air/fuel ratio sensor heater system.
P1166 – Heated Oxgen Sensor Sensor1 (Primary HO2S) Heater Circuit Malfunction: Heater circuit malfunction in the primary oxygen sensor.
P1167 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Heater System Malfunction: Heater system malfunction in the air/fuel ratio sensor.
P1167 – Heated Oxygen Sensor Sensor1 (Primary LAF HO2S) Heater System Malfunction: Heater system malfunction in the primary LAF oxygen sensor.
P1168 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) LABEL Low Voltage: Low voltage on the LABEL line of the air/fuel ratio sensor.
P1169 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) LABEL High Voltage: High voltage on the LABEL line of the air/fuel ratio sensor.
P1182 – Fuel Temperature Sensor Circuit Low Voltage: Low voltage in the fuel temperature sensor circuit.
P1183 – Fuel Temperature Sensor Circuit High Voltage: High voltage in the fuel temperature sensor circuit.
P1253 – VTEC System Malfunction: General VTEC (Variable Valve Timing and Lift Electronic Control) system malfunction.
P1259 – VTEC System Malfunction: General VTEC system malfunction.
P1297 – Electric Load Detector (ELD) Circuit Low Voltage: Low voltage in the ELD circuit, which monitors electrical load on the system.
P1298 – Electric Load Detector (ELD) Circuit High Voltage: High voltage in the ELD circuit.

P1300 – P1399: Misfire, Knock Sensor, and Timing Codes (Honda Specific)

Honda specific codes within the P13xx range often relate to misfires and timing issues.

P1300 – Random Misfire: Random misfire detected (Honda specific context).
P1324 – Knock Sensor Power Source Circuit Low Voltage: Low voltage in the knock sensor power source circuit.
P1336 – Engine Speed (RPM) Fluctuation Sensor Intermittent Interruption: Intermittent signal from the engine speed fluctuation sensor.
P1337 – Engine Speed (RPM) Fluctuation Sensor No Signal: No signal from the engine speed fluctuation sensor.
P1355 – Front Ignition Coil Power Circuit Malfunction: Problem with the power circuit to the front ignition coil(s).
P1359 – Crankshaft Position (CKP)/Top Dead Center (TDC) Sensor Circuit Malfunction: Problem with the CKP/TDC sensor circuit.
P1361 – Camshaft Position (CMP) Sensor A (Top Dead Center (TDC) Sensor) Intermittent Interruption: Intermittent signal from CMP/TDC sensor A.
P1361 – Top Dead Center (TDC) Sensor Intermittent Interruption: Intermittent signal from the TDC sensor.
P1362 – Camshaft Position (CMP) Sensor A (Top Dead Center (TDC) Sensor) No Signal: No signal from CMP/TDC sensor A.
P1362 – Top Dead Center (TDC) Sensor No Signal: No signal from the TDC sensor.
P1366 – Camshaft Position (CMP) Sensor B (Top Dead Center (TDC) Sensor) Intermittent Interruption: Intermittent signal from CMP/TDC sensor B.
P1366 – Top Dead Center (TDC) Sensor 2 Intermittent Interruption: Intermittent signal from TDC sensor 2.
P1367 – Camshaft Position (CMP) Sensor B (Top Dead Center (TDC) Sensor) No Signal: No signal from CMP/TDC sensor B.
P1367 – Top Dear Center (TDC) Sensor 2 No Signal: No signal from TDC sensor 2.
P1381 – Cylinder Position (CYP) Sensor Intermittent Interruption: Intermittent signal from the cylinder position sensor.
P1382 – Cylinder Position (CYP) Sensor No Signal: No signal from the cylinder position sensor.

P1400 – P1499: Emission Control & Auxiliary System Codes (Honda Specific)

Honda specific emission and auxiliary system codes.

P1410 – Air Pump Malfunction: Air pump system malfunction (Honda specific context).
P1415 – Air Pump Electric Current Sensor Circuit Low Voltage: Low voltage in the air pump current sensor circuit.
P1416 – Air Pump Electric Current Sensor Circuit High Voltage: High voltage in the air pump current sensor circuit.
P1420 – NOx Adsorptive Catalyst System Efficiency Below Threshold: NOx catalyst efficiency below threshold.
P1438 – Motor Drive Module (MDM) Overheating Signal Circuit: Overheating signal from the motor drive module.
P1438 – Motor Drive Module (MDM) Overheating: Motor drive module overheating.
P1439 – Motor Drive Module (MDM) Short Circuit Sensor Problem: Short circuit sensor problem in the motor drive module.
P1439 – Motor Drive Module (MDM) Short Circuit: Short circuit in the motor drive module.
P1440 – IMA System Problem: Integrated Motor Assist (IMA) system problem (Hybrid models).
P1445 – Bypass Control Problem: Bypass control system issue, possibly related to emissions or cooling.
P1448 – Battery Module Overheating: Battery module overheating (Hybrid models).
P1449 – Battery Module Overheating: Battery cell overheating (Hybrid models).
P1449 – Battery Cell Overheating: Battery module individual voltage input deviation (Hybrid models).
P1449 – Battery Module Individual Voltage Input Deviation: Battery module deterioration (Hybrid models).
P1449 – Battery Module Deterioration: Battery module deviation (Hybrid models).
P1449 – Battery Module Deviation: Fuel Tank Pressure (FTP) Sensor Range/Performance Problem: FTP sensor reading out of range (duplicate code – likely P0451).
P1454 – Fuel Tank Pressure (FTP) Sensor Range/Performance Problem: FTP sensor reading out of range.
P1456 – Evaporative Emissions (EVAP) Control System Leakage (Fuel Tank System): EVAP system leak in the fuel tank system.
P1457 – Evaporative Emissions (EVAP) Control System Leakage (EVAP Canister System): EVAP system leak in the EVAP canister system.
P1459 – Evaporative Emission (EVAP) Purge Flow Switch Malfunction: Problem with the EVAP purge flow switch.
P1491 – Exhaust Gas Recirculation (EGR) Valve Insufficient Lift: EGR valve not lifting sufficiently.
P1486 – Cooling System Malfunction: Cooling system malfunction (duplicate code – likely P0128).
P1491 – Exhaust Gas Recirculation (EGR) Valve Insufficient Lift: EGR valve not lifting sufficiently (duplicate code – likely P1491).
P1498 – Exhaust Gas Recirculation (EGR) Valve Position Sensor Circuit High Voltage: High voltage in the EGR valve position sensor circuit.

P1500 – P1599: Idle Control and Auxiliary System Codes (Honda Specific)

Honda specific codes related to idle control and auxiliary systems.

P1505 – Positive Crankcase Ventilation (PCV) Air Leakage: Air leak in the PCV system.
P1508 – Idle Air Control Valve (IACV) Circuit Malfunction: Problem with the IACV circuit.
P1519 – Idle Air Control Valve (IACV) Circuit Malfunction: Problem with the IACV circuit (duplicate code – likely P1508).
P1509 – Idle Air Control Valve (IACV) Circuit Failure: IACV circuit failure.
P1522 – Brake Booster Pressure Sensor Circuit Low Voltage: Low voltage in the brake booster pressure sensor circuit.
P1523 – Brake Booster Pressure Sensor Circuit High Voltage: High voltage in the brake booster pressure sensor circuit.
P1524 – Brake Booster Pressure Sensor Range/Performance Problem: Brake booster pressure sensor reading out of range.
P1541 – Climate Control Unit Signal Circuit Low Voltage: Low voltage in the climate control unit signal circuit.
P1542 – Climate Control Unit Signal Circuit High Voltage: High voltage in the climate control unit signal circuit.
P1565 – Motor Commutation Signal Problem: Problem with the motor commutation signal, possibly related to electric power steering or hybrid systems.
P1568 – Battery Module Individual Voltage Input Problem: Battery module voltage input problem (Hybrid models).
P1568 – Battery Module Temperature Signal Circuit Problem: Battery module temperature signal circuit problem (Hybrid models).
P1568 – Battery Cell Temperature Signal Circuit Problem: Battery cell temperature signal circuit problem (Hybrid models).
P1572 – Motor Drive Module (MDM) Temperature Signal Circuit Low Input: Low input in the MDM temperature signal circuit.
P1572 – Motor Drive Module (MDM) Temperature Signal Circuit High Input: High input in the MDM temperature signal circuit.
P1576 – Motor Drive Module (MDM) Voltge Signal Circuit Low Input: Low input in the MDM voltage signal circuit.
P1577 – High Voltage Detection Signal Circuit Problem: Problem with the high voltage detection signal circuit, likely related to hybrid systems.
P1580 – Battery Current Circuit Problem: Battery current circuit problem (Hybrid models).
P1581 – Motor Power Inverter (MPI) Module Current Signal Circuit Low Input: Low input in the MPI module current signal circuit.
P1581 – Motor Power Inverter (MPI) Module Current Signal Circuit High Input: High input in the MPI module current signal circuit.
P1581 – Motor Power Inverter (MPI) Module Current Signal Circuit Problem: Problem with the MPI module current signal circuit.
P1582 – Motor Current U Phase Signal Circuit Low Input: Low input in the motor current U phase signal circuit.
P1582 – Motor Current U Phase Signal Circuit High Input: High input in the motor current U phase signal circuit.
P1583 – Motor Current V Phase Signal Circuit Low Input: Low input in the motor current V phase signal circuit.
P1583 – Motor Current V Phase Signal Circuit High Input: High input in the motor current V phase signal circuit.
P1584 – Motor Current W Phase Signal Circuit Low Input: Low input in the motor current W phase signal circuit.
P1584 – Motor Current W Phase Signal Circuit High Input: High input in the motor current W phase signal circuit.
P1585 – Motor Current Signal Circuit Problem: Problem with the motor current signal circuit.
P1586 – Motor Power Inverter (MPI) Module Current Signal/Battery Current Signal Circuit Problem: Problem with MPI module current signal/battery current signal circuit.

P1600 – P1899: Transmission Control, Module Communication, and Honda Specific Codes

These codes include transmission control module issues, communication problems, and more Honda specific codes.

P1607 – Engine Control Module (ECM)/Powertrain Control Module (PCM) Internal Circuit Malfunction: Internal circuit malfunction within the ECM/PCM.
P1630 – Transmission Control Module: General transmission control module issue.
P1635 – Battery Condition Monitor (BCM) Module Proble: Problem with the battery condition monitor module.
P1639 – MOTB Signal Circuit Malfunction: Malfunction in the MOTB (Motor On Throttle Body) signal circuit.
P1640 – ACTTRQ Motor Torque Signal Circuit Low Input: Low input in the ACTTRQ (Actual Torque) motor torque signal circuit.
P1641 – ACTTRQ Motor Torque Signal Circuit High Input: High input in the ACTTRQ motor torque signal circuit.
P1642 – QBATT Battery Signal Circuit Low Input: Low input in the QBATT (Battery Quality) signal circuit.
P1643 – QBATT Battery Signal Circuit High Input: High input in the QBATT signal circuit.
P1644 – MOTFSA Signal Malfunction: Malfunction in the MOTFSA signal (Motor Torque Feedback Sensor A).
P1645 – MOTFSB Signal Malfunction: Malfunction in the MOTFSB signal (Motor Torque Feedback Sensor B).
P1646 – MOTSTB Signal Malfunction: Malfunction in the MOTSTB signal (Motor Torque State B).
P1647 – Power Command Signal Circuit Low Input: Low input in the power command signal circuit.
P1647 – Power Command Signal Circuit High Input: High input in the power command signal circuit.
P1647 – Engine Torque Signal Circuit Low Input: Low input in the engine torque signal circuit.
P1647 – Engine Torque Signal Circuit High Input: High input in the engine torque signal circuit.
P1647 – Mode Signal Circuit 1 Low Input: Low input in mode signal circuit 1.
P1647 – Mode Signal Circuit 1 High Input: High input in mode signal circuit 1.
P1647 – Mode Signal Circuit 2 Problem: Problem with mode signal circuit 2.
P1647 – Engine Speed Signal Circuit Problem: Problem with the engine speed signal circuit.
P1648 – Battery Condition Monitor (BCM) Module Communication Signal Circuit Problem: Communication signal problem with the BCM module.
P1648 – Motor Control Module (MCM) Communication Signal Circuit Problem: Communication signal problem with the MCM module.
P1655 – CVT-FI TMA/TMB Signal Line Failure: Signal line failure in the CVT-FI TMA/TMB system (Continuously Variable Transmission – Fuel Injection).
P1656 – Problem in PCM-toVTM-4 Control Unit Communications Circuit: Communication problem between PCM and VTM-4 (Variable Torque Management 4-Wheel Drive) control unit.
P1660 – A/T-FI Data Line Failure/TCM – ECM Halt: Data line failure in the automatic transmission fuel injection system or TCM-ECM communication halt.
P1676 – FPTDR Signal Line Failure: Signal line failure in the FPTDR (Fuel Pump Transistor Drive Relay) system.
P1678 – FPTDR Signal Line Failure: Signal line failure in the FPTDR (Fuel Pump Transistor Drive Relay) system (duplicate code – likely P1676).
P1679 – RSCD Signal Circuit Malfunction: Malfunction in the RSCD (Roll Stability Control Device) signal circuit.
P1681 – A/T FI Signal A Cicuit Low Voltage: Low voltage in A/T FI (Automatic Transmission Fuel Injection) signal A circuit.
P1682 – A/T FI Signal A Circuit High Voltage: High voltage in A/T FI signal A circuit.
P1683 – Throttle Valve Default Position Spring Performance Problem: Performance issue with the throttle valve default position spring.
P1684 – Throttle Valve Return Spring Performance Problem: Performance issue with the throttle valve return spring.
P1686 – A/T FI Signal B Circuit Low Voltage: Low voltage in A/T FI signal B circuit.
P1687 – A/T FI Signal B Circuit High Voltage: High voltage in A/T FI signal B circuit.
P1705 – Short in Transmission Range Switch Circuit (More than one range position is on at the same time): Short circuit in the transmission range switch, indicating multiple gear positions are active simultaneously.
P1706 – Open in Transmission Range Switch Circuit: Open circuit in the transmission range switch.
P1709 – Problem Transmission Gear Selection Switch Circuit: Problem with the transmission gear selection switch circuit.
P1730 – Problem in Shift Control System: Shift Solenoid Valve A and D Stuck OFF Shift Solenoid Valve B Stuck ON Shift Valves A, B, and D Stuck: Complex shift control system problem involving multiple solenoid valves.
P1731 – Problem in Shift Control System: Shift Solenoid Valve E Stuck ON Shift Valve E Stuck A/T Clutch Pressure Control Solenoid Valve A Stuck OFF: Complex shift control system problem involving solenoid valve E and clutch pressure solenoid A.
P1732 – Problem in Shift Control System: Shift Solenoid Valve B and C Stuck ON Shift Valves B and C Stuck: Complex shift control system problem involving solenoid valves B and C.
P1733 – Problem in Shift Control System: Shift Solenoid Valve D Stuck ON Shift Valve D Stuck A/T Clutch Pressure Control Solenoid Valve C Stuck OFF: Complex shift control system problem involving solenoid valve D and clutch pressure solenoid C.
P1734 – Problem in Shift Control System: Shift Solenoid Valves B and C Stuck ON Shift Valves B and C Stuck: Complex shift control system problem involving solenoid valves B and C (duplicate code – likely P1732).
P1738 – Problem in 2nd Clutch Pressure Switch Circuit: Problem with the 2nd clutch pressure switch circuit.
P1739 – Problem in 3rd Clutch Pressure Switch Circuit: Problem with the 3rd clutch pressure switch circuit.
P1740 – Problem in 4th Clutch Pressure Switch Circuit: Problem with the 4th clutch pressure switch circuit.
P1750 – Mechanical Problem in Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve Assemblies A and B, or Problem in the Hydraulic Control System: Mechanical problem in hydraulic control system related to clutch pressure solenoids A and B.
P1751 – Mechanical Problem in Hydraulic Control System of Shift Solenoid Valve B and A/T Clutch Pressure Control Solenoid Valves A and B, or Problem in the Hydraulic Control System: Complex mechanical problem in hydraulic control system involving shift solenoid B and clutch pressure solenoids A and B.
P1753 – Problem in Torque Converter Clutch Solenoid Valve Circuit: Problem with the torque converter clutch solenoid valve circuit (duplicate code – likely P0743).
P1751 – Problem in Torque Converter Clutch Solenoid Valve B Circuit: Problem with the torque converter clutch solenoid valve B circuit (duplicate code – likely P1768).
P1768 – Problem in Torque Converter Clutch Solenoid Valve B Circuit: Problem with the torque converter clutch solenoid valve B circuit.
P1773 – Problem in A/T Clutch Pressure Control Solenoid Valve B Circuit: Problem with the circuit of clutch pressure control solenoid valve B (duplicate code – likely P0778).
P1790 – Throttle Position (TP) Sensor Circuit Malfunction: Throttle position sensor circuit malfunction (duplicate code – likely P0122/P0123).
P1791 – Vehicle Speed Sensor (VSS) Range/Performance Problem: Vehicle speed sensor range/performance problem (duplicate code – likely P0501).
P1792 – Problem in Engine Coolant Temperature (ECT) Sensor Circuit: Problem in the ECT sensor circuit (duplicate code – likely P0116/P0117/P0118).
P1793 – Manifold Absolute Pressure Sensor Circuit: Manifold absolute pressure sensor circuit problem (duplicate code – likely P0106/P0107/P0108).
P1870 – Problem in CVT Speed Change Control Valve Assembly Circuit: Problem with the CVT speed change control valve assembly circuit.
P1873 – Problem in CVT Pulley Pressure Control Valve Assembly Circuit: Problem with the CVT pulley pressure control valve assembly circuit.
P1879 – Problem in CVT Start Clutch Pressure Control Valve Assembly Circuit: Problem with the CVT start clutch pressure control valve assembly circuit.
P1882 – Problem in Inhibitor Solenoid Circuit: Problem with the inhibitor solenoid circuit, possibly related to transmission safety features.
P1884 – Secondary Gear Speed Sensor 2 Circuit Malfunction: Malfunction in the secondary gear speed sensor 2 circuit.
P1885 – CVT Drive Pulley Speed Sensor Circuit: Problem with the CVT drive pulley speed sensor circuit.
P1886 – CVT Driven Pulley Speed Sensor Circuit: Problem with the CVT driven pulley speed sensor circuit.
P1888 – CVT Speed Sensor: General CVT speed sensor problem.
P1889 – Problem in CVT Speed Sensor 2 Circuit: Problem with CVT speed sensor 2 circuit.
P1890 – Shift Control System: Shift control system problem (duplicate code – likely P0730/P0780/P1730 etc.).
P1891 – Problem in Start Clutch System: Problem with the start clutch system, likely related to CVT transmissions.
P1894 – CVT Speed Change Control Valve Circuit: Problem with the CVT speed change control valve circuit (duplicate code – likely P1870).
P1895 – CVT Pulley Pressure Control Valve Circuit: Problem with the CVT pulley pressure control valve circuit (duplicate code – likely P1873).

P2000 – P2999: Powertrain Codes – Fuel and Air Metering, Auxiliary Emission Controls

These codes continue to cover powertrain issues, especially related to fuel and air and emissions systems.

P2101 – Throttle Actuator System Malfunction: General malfunction in the throttle actuator system, which controls electronic throttle.
P2108 – Throttle Actuator Control Module Problem: Problem with the throttle actuator control module.
P2118 – Throttle Actuator Current Range/Performance Problem: Throttle actuator current is out of range.
P2122 – Accelerator Pedal Position (APP) Sensor 1 (Throttle Position Sensor D) Circuit Low Voltage: Low voltage from APP sensor 1.
P2123 – Accelerator Pedal Position (APP) Sensor 1 (Throttle Position Sensor D) Circuit High Voltage: High voltage from APP sensor 1.
P2127 – Accelerator Pedal Position (APP) Sensor 2 (Throttle Position Sensor E) Circuit Low Voltage: Low voltage from APP sensor 2.
P2128 – Accelerator Pedal Position (APP) Sensor 2 (Throttle Position Sensor E) Circuit High Voltage: High voltage from APP sensor 2.
P2135 – Throttle Position (TP) Sensor 1/2 Incorrect Voltage Correlation: Incorrect voltage correlation between TP sensors 1 and 2.
P2138 – Accelerator Pedal Position (APP) Sensor 1/2 (Throttle Position Sensor D/E) Incorrect Voltage Correlation: Incorrect voltage correlation between APP sensors 1 and 2.
P2176 – Throttle Actuator Control System Idle Position Not Learned: Throttle actuator idle position not learned after reset or replacement.
P2195 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Signal Stuck Lean: Air/Fuel ratio sensor signal is stuck indicating a lean condition.
P2197 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Signal Stuck Lean: Air/Fuel ratio sensor signal on Bank 2 is stuck lean.
P2227 – Barometric Pressure (BARO) Sensor Circuit Range/Performance Problem: BARO sensor reading out of range (duplicate code – likely P1106).
P2228 – Barometric Pressure (BARO) Sensor Circuit Low Voltage: Low voltage in the BARO sensor circuit (duplicate code – likely P1107).
P2229 – Barometric Pressure (BARO) Sensor Circuit High Voltage: High voltage in the BARO sensor circuit (duplicate code – likely P1108).
P2237 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) IP Line High Voltage: High voltage on the IP line of the rear air/fuel ratio sensor.
P2238 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS+ Line Low Voltage: Low voltage on the AFS+ line of the air/fuel ratio sensor (duplicate code – likely P1159).
P2238 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) IP Line Low Voltage: Low voltage on the IP line of the rear air/fuel ratio sensor.
P2240 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) IP Line High Voltage: High voltage on the IP line of the front air/fuel ratio sensor.
P2241 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) IP Line Low Voltage: Low voltage on the IP line of the front air/fuel ratio sensor.
P2243 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VCENT Line High Voltage: High voltage on the VCENT line of the rear air/fuel ratio sensor.
P2245 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VCENT Line Low Voltage: Low voltage on the VCENT line of the rear air/fuel ratio sensor.
P2247 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VCENT Line High Voltage: High voltage on the VCENT line of the front air/fuel ratio sensor.
P2249 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VCENT Line Low Voltage: Low voltage on the VCENT line of the front air/fuel ratio sensor.
P2251 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VS Line High Voltage: High voltage on the VS line of the rear air/fuel ratio sensor.
P2252 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS- Line Low Voltage: Low voltage on the AFS- line of the air/fuel ratio sensor (duplicate code – likely P1158).
P2254 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VS Line High Voltage: High voltage on the VS line of the front air/fuel ratio sensor.
P2255 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VS Line Low Voltage: Low voltage on the VS line of the front air/fuel ratio sensor.
P2279 – Intake Air System Leak: Leak detected in the intake air system, potentially causing lean running conditions.
P2413 – Exhaust Gas Recirculation (EGR) System Range/Performance Problem: EGR system performance issue (duplicate code – likely P0404).
P2422 – Evaporative Emission (EVAP) System Vent Shut Valve Close Malfunction: EVAP vent shut valve stuck closed.
P2552 – Throttle Actuator Control Module Relay Malfunction: Malfunction in the throttle actuator control module relay.
P2627 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage: Low voltage on the LABEL circuit of the rear air/fuel ratio sensor.
P2628 – Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) LABEL Circuit High Voltage: High voltage on the LABEL circuit of the rear air/fuel ratio sensor.
P2630 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) LABEL Circuit Low Voltage: Low voltage on the LABEL circuit of the front air/fuel ratio sensor.
P2631 – Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) LABEL Circuit High Voltage: High voltage on the LABEL circuit of the front air/fuel ratio sensor.
P2646 – VTEC Oil Pressure Switch Circuit Low Voltage: Low voltage in the VTEC oil pressure switch circuit.
P2647 – VTEC Oil Pressure Switch Circuit High Voltage: High voltage in the VTEC oil pressure switch circuit.
P2648 – VTEC Solenoid Valve Circuit Low Voltage: Low voltage in the VTEC solenoid valve circuit.
P2649 – VTEC Solenoid Valve Circuit High Voltage: High voltage in the VTEC solenoid valve circuit.
P2769 – Short in Torque Converter Clutch Solenoid Valve Circuit: Short circuit in the torque converter clutch solenoid valve (duplicate code – likely P0743).
P2770 – Open in Torque Converter Clutch Solenoid Valve Circuit: Open circuit in the torque converter clutch solenoid valve (duplicate code – likely P0743).
P2A00 – Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem: Air/Fuel ratio sensor performance issue (duplicate code – likely P1149/P1164/P1165).
P2A03 – Front A/F Sensor Circuit (Bank 2, Sensor 1) Circuit Range/Performance Problem: Air/Fuel ratio sensor performance issue on Bank 2.

U0000 – U0999: Network Communication Codes

These codes relate to communication issues within the vehicle’s network.

U0073 – FCAN Malfunction (Bus-off): FCAN (Fault-Tolerant Controller Area Network) communication bus is off or malfunctioning.
U0107 – Lost Communication With Throttle Actuator Control Module: Communication loss with the throttle actuator control module.
U0121 – FCAN Malfunction (TCS-PCM): FCAN communication issue between TCS (Traction Control System) and PCM.
U0155 – FCAN Malfunction (Gauge Control Module-ECM/PCM): FCAN communication issue between the gauge control module and ECM/PCM.

Using the Honda Civic OBD2 Codes List for Diagnosis

This list provides a starting point for understanding potential issues indicated by OBD2 codes in your Honda Civic. However, it’s crucial to remember:

OBD2 codes are not definitive diagnoses. They point to potential problem areas but further investigation is always needed to pinpoint the root cause.
Context is important. The same code can have different causes depending on the specific model year, engine type, and driving conditions of your Honda Civic.
Professional diagnosis is recommended. While this list is helpful for initial understanding, it’s best to consult a qualified mechanic for accurate diagnosis and repair, especially for complex or intermittent issues.

Using an OBD2 scanner to read the codes is the first step. Once you have the code, refer to this list to understand its potential meaning. Then, proceed with further troubleshooting steps, which may include:

Visual inspection: Check for any obvious signs of damage, leaks, or loose connections related to the suspected system.
Sensor testing: Use a multimeter or scan tool to test the sensors indicated by the code.
Component testing: Test actuators, solenoids, and other components to ensure they are functioning correctly.
Wiring checks: Inspect wiring harnesses and connectors for damage, corrosion, or shorts.

By combining this comprehensive Honda Civic OBD2 codes list with careful troubleshooting, you can effectively diagnose and address issues with your vehicle, ensuring its optimal performance and longevity.