Chrysler OBD2 Codes: Your Guide to Understanding and Troubleshooting Engine Problems

Understanding the complexities of your vehicle can be daunting, especially when the check engine light illuminates. For Chrysler, Dodge, Jeep, and RAM owners, On-Board Diagnostics II (OBD2) codes are invaluable tools for diagnosing potential issues. This guide provides a comprehensive look at Chrysler OBD2 codes, helping you understand what they mean and how to retrieve them, empowering you to take informed steps towards vehicle maintenance and repair.

Before diving into the codes, it’s crucial to understand a few key points. This list, while extensive, is not exhaustive and should be used as a troubleshooting aid, not a definitive repair manual. Modern vehicle computer systems (ECUs) are sophisticated but not infallible. They interpret sensor data and may sometimes misdiagnose problems or not detect intermittent faults. A professional OBD2 scanner can provide more detailed and accurate information than the methods described below. Therefore, always consult with a certified mechanic for accurate diagnosis and repair verification.

Disclaimer: This information is intended for educational purposes and should not be considered a substitute for professional automotive diagnostic services. Accuracy is not guaranteed, and this guide is a work in progress. Consult a qualified technician for diagnosis and repairs.

Retrieving Chrysler OBD Codes: Key Tricks for DIY Diagnostics

There are different methods to retrieve diagnostic codes from your Chrysler vehicle, depending on its model year and OBD system. Here’s a breakdown of the “key trick” methods for both older (OBD1) and newer (OBD2) Chrysler models.

Retrieving OBD1 Codes on Older Chrysler Models (Pre-1996)

For older Chrysler vehicles equipped with OBD1 systems, you can use a simple “key trick” to display the fault codes through the check engine light. Here’s how:

Start with the ignition OFF. Ensure your key is not in the ignition or is turned to the “Lock” position.
Perform the “Key Trick”: Within five seconds, cycle the ignition key between the “ON” and “OFF” positions three times, ending in the “ON” position. Remember, “ON” is just before starting the engine, and “OFF” is not “Lock.” The sequence is: ON-OFF-ON-OFF-ON.
Observe the Check Engine Light: The “check engine” light will begin to flash. Count the flashes to decipher the two-digit codes.
Decoding the Flashes: Each code is represented by a series of flashes. For example, code 23 would be FLASH-FLASH (pause) FLASH-FLASH-FLASH (longer pause). Pay close attention to the pauses to differentiate between codes. Codes are not repeated, and code 55 (FLASH-FLASH-FLASH-FLASH-FLASH) indicates the “end of codes” and is a normal signal.
Parking Brake Consideration: In some older models, you might need to engage the parking brake for the codes to display correctly.

Important Notes for OBD1 Retrieval:

Flash Uniformity: On older systems, the blink spacing might not be perfectly uniform. If you see a sequence like 23 23, it is likely a single code 55 (end of codes).
Two-Digit Codes: OBD1 Chrysler codes are always two-digit numbers.

Retrieving OBD2 Codes on Newer Chrysler Models (1996 and Newer)

For newer Chrysler vehicles with OBD2 systems, there are a couple of methods to retrieve codes using “key tricks,” including an odometer-based method.

Odometer Reset Button Method:
a. Key and Button Position: Insert the key into the ignition. Press and hold down the odometer reset button.
b. Turn Key to RUN: While holding the odometer reset button, turn the ignition key to the “RUN” position (just before starting the engine). Then, release the odometer reset button.
c. Observe Odometer Display: The odometer will cycle through a series of numbers (e.g., 111111 to 999999), then display the vehicle’s serial number. After this, it should display any stored error codes, often starting with a “P” (for Powertrain codes).
OBD1 “Key Trick” Method (Alternative for OBD2): If the odometer method doesn’t work, try the OBD1 “key trick” method described above for older models. Sometimes, newer models may also respond to this sequence.
Digital Odometer Display: On many newer Chrysler models equipped with a digital odometer, the diagnostic codes are typically displayed directly on the odometer screen rather than through check engine light flashes.

Limp-In Mode: In critical failure situations, the vehicle’s computer might activate “Limp-In” mode. This is a safety feature that allows you to drive the car to a repair shop when a major malfunction is detected. A common symptom of Limp-In mode is the loss of third and/or fourth gear in automatic transmissions.

Understanding Chrysler OBD Codes: Decoding the Trouble

Once you have retrieved the codes from your Chrysler vehicle, the next step is to understand what they mean. OBD codes are standardized across the automotive industry, but specific manufacturer codes and nuances exist. Below are comprehensive lists of both older OBD1 and newer OBD2 Chrysler codes to help you decipher the trouble your vehicle is reporting.

Older Model Computer Codes (OBD1) – Chrysler, Dodge, Jeep (Pre-1996)

Important Note: OBD1 codes can vary for vehicles manufactured around 1996. This list is generally applicable to older models.

11: No ignition reference signal detected during cranking OR timing belt skipped one or more teeth; OR loss of either camshaft or crankshaft position sensor.
12: Battery or computer recently disconnected. This code often appears after battery replacement or ECU reset and may not indicate a current problem if the vehicle is running normally.
13: MAP sensor or vacuum line may not be working. Manifold Absolute Pressure (MAP) sensor issues can affect fuel delivery and engine performance.
14: MAP sensor voltage below .16V or over 4.96V. Indicates an electrical issue with the MAP sensor circuit.
15: No speed/distance sensor signal. Vehicle Speed Sensor (VSS) problems can affect speedometer readings, transmission shifting, and cruise control.
16: Loss of battery voltage detected with engine running. Indicates a charging system problem or voltage drop.
17: Engine stays cool too long (bad thermostat or coolant sensor?). May indicate a thermostat stuck open or a faulty coolant temperature sensor. OR 17 (1985 turbo only): knock sensor circuit.
21: Oxygen sensor signal doesn’t change (stays at 4.3-4.5V). Probably bad oxygen sensor. Indicates a likely failure of the oxygen sensor, which monitors exhaust gases for fuel mixture adjustments.
22: Coolant sensor signal out of range – May have been disconnected to set timing. Similar to code 17, but indicating a more significant sensor issue.
23: Incoming air temperature sensor may be bad. Intake Air Temperature (IAT) sensor issues can affect fuel mixture calculations.
24: Throttle position sensor over 4.96V. Throttle Position Sensor (TPS) problems can affect idle and acceleration.
25: Automatic Idle Speed (AIS) motor driver circuit shorted or target idle not reached. Issues with the idle control system.
26: Peak injector circuit voltage has not been reached (need to check computer signals, voltage reg, injectors). Fuel injector electrical problem.
27: Injector circuit isn’t switching when it’s told to (TBI). OR (MPI) injector circuit #1 not switching right. OR (turbo) injector circuit #2 not switching right. OR (all 1990-) injector output driver not responding – check computer, connections. Various fuel injector circuit problems depending on engine type and year.
31: Bad evaporator purge solenoid circuit or driver. Evaporative Emission Control System (EVAP) purge solenoid issue.
32: (1984 only) power loss/limited lamp or circuit. OR 32 EGR gases not working (1988) – check vacuum, valve. OR 32 (1990-92) computer didn’t see change in air/fuel ratio when EGR activated – check valve, vacuum lines, and EGR electrical. Exhaust Gas Recirculation (EGR) system problems, varying by year.
33: Air conditioning clutch relay circuit open or shorted (may be in the wide-open-throttle cutoff circuit or normal on early 80’s models if you don’t have air conditioning). A/C system electrical issue.
34: (1984-86) EGR solenoid circuit shorted or open. OR 34 (1987-1991) speed control shorted or open. EGR or Speed Control system electrical problem, depending on year.
35: Cooling fan relay circuit open or shorted. OR 35 idle switch motor fault – check connections. Cooling fan or idle switch issue.
36: (turbo only) Wastegate control circuit open or shorted. Turbocharger wastegate control problem.
37: Shift indicator light failure, 5-speed. OR part throttle lock/unlock solenoid driver circuit (87-89). OR solenoid coil circuit (85-87 Turbo only). OR Trans temperature sensor voltage low (1995 and on). Transmission-related issue, varies by year and transmission type.
41: Alternator field control circuit open or shorted. Charging system alternator field control circuit issue.
42: Automatic shutdown relay circuit open or shorted. OR 42 Fuel pump relay control circuit. OR 42 Fuel level unit – no change over miles. OR 42 Z1 voltage missing when autoshutdown circuit energized. Automatic Shutdown (ASD) relay, fuel pump relay, or fuel level sensor problem.
43: Peak primary coil current not achieved with max dwell time. OR 43 Cylinder misfire. OR 43 Problem in power module to logic module interface. Ignition coil, misfire, or ECU interface issue.
44: No FJ2 voltage present at logic board. OR 44 Logic module self-diagnostics indicate problem. OR 44 Battery temperature out of range. ECU (Logic Module) or battery temperature sensor problem.
45: Turbo boost limit exceeded (engine was shut down by logic module). Turbo overboost condition.
46: Battery voltage too high during charging or charging system voltage too low. Charging system voltage problem (over or under voltage).
47: Battery voltage too low and alternator output too low. Charging system under voltage and low alternator output.
51: Oxygen sensor stuck at lean position (this may be tripped by a bad MAP sensor system causing a rich condition. If you get hot rough idle and stalling, especially on deceleration, accompanied by flooded engine and difficulty restarting, that can be a bad MAP sensor causing the O2 sensor to try to compensate. If you get poor cold driveability, stumbling and bucking, and acceptable warm driving with poor gas mileage (a drop of 10 mpg or more), that is usually the O2 sensor. OR 51 Internal logic module fault (’84 turbo only). Oxygen sensor or potentially MAP sensor issue causing a lean condition. ECU fault in some older models.
52: Oxygen sensor stuck at rich position. OR 52 Internal logic module fault (’84 turbo only). Oxygen sensor or ECU fault causing a rich condition.
53: Logic module internal problem. ECU (Logic Module) internal fault.
54: No sync pickup signal during engine rotation (turbo only). OR 54 Internal logic module fault (’84 turbo only) – or camshaft sensor/distributor timing. Sync pickup signal issue (turbo models), ECU fault, or timing issue.
55: End of codes. Normal code indicating the end of diagnostic trouble codes.
61: “Baro” sensor open or shorted. Barometric pressure sensor issue.
62: EMR mileage cannot be stored in EEPROM. OR 62 PCM failure SRI mile not stored. EEPROM or PCM (Powertrain Control Module) memory issue related to mileage storage.
63: Controller cannot write to EEPROM. ECU cannot write to EEPROM memory.
64: Catalytic converter efficiency failure. Catalytic converter efficiency below threshold.
65: Power steering switch failure. Power steering pressure switch problem.
66: No CCD Message From TCM and/or No CCD Message From BCM. Communication issue with Transmission Control Module (TCM) or Body Control Module (BCM) on the CCD bus.

Newer Model Computer Codes (OBD2) – Chrysler, Dodge, Jeep, RAM (1996+)

OBD2 codes are generally five characters long, starting with a letter followed by four numbers. “P” codes are Powertrain related (engine, transmission). This list focuses on common numeric codes referenced in the original article. For full OBD2 code definitions, always consult a reliable OBD2 resource or repair manual, as there are subcategories and more detailed descriptions within the OBD2 standard.

30/36/130: Sensor heater relay problem. Indicates an issue with the sensor heater relay circuit, often related to oxygen sensors.
106: MAP sensor voltage out of range detected at startup. MAP sensor voltage issue specifically at engine startup.
107: MAP sensor voltage too low. Low voltage signal from the MAP sensor.
108: MAP sensor voltage too high. High voltage signal from the MAP sensor.
112: Intake air temperature sensor voltage low. Low voltage signal from the Intake Air Temperature (IAT) sensor.
113: Intake air (charge) temperature sensor voltage high. High voltage signal from the IAT sensor.
116: Coolant temperature sensor reading doesn’t make sense. Implausible reading from the Coolant Temperature Sensor.
117: Engine coolant temperature sensor voltage low. Low voltage signal from the Coolant Temperature Sensor.
118: Engine coolant temperature sensor voltage high. High voltage signal from the Coolant Temperature Sensor.
121: Throttle position sensor and MAP sensor disagree with each other. Inconsistent readings between TPS and MAP sensors, potentially indicating a vacuum leak or sensor malfunction.
122: Throttle position sensor voltage low. Low voltage signal from the Throttle Position Sensor (TPS).
123: Throttle position sensor voltage high. High voltage signal from the TPS.
125: Taking too long to reach proper operating temperature and switch to energy-efficient mode. Engine taking too long to warm up, potentially related to thermostat issues.
130-147: O2 Sensor Circuit Malfunction (Bank 1/Bank 2, Sensor 1/Sensor 2/Sensor 3). Various issues with oxygen sensor circuits, including malfunction, low/high voltage, slow response, no activity, and heater circuit problems. Bank 1 and Bank 2 refer to engine cylinder bank locations, and Sensor 1, 2, and 3 refer to sensor positions relative to the catalytic converter.
147, 155, 161: Oxygen sensor heater element not working properly (this device helps to reduce emissions more quickly). Oxygen sensor heater circuit malfunction, affecting sensor warm-up and emissions control.
151, 157: Oxygen sensor voltage problem – short circuit to ground? Oxygen sensor circuit short to ground.
152, 158: Oxygen sensor voltage problem – short circuit to active 12V? Oxygen sensor circuit short to voltage.
153, 159: Oxygen sensor response too slow. Slow response time from the oxygen sensor, indicating potential sensor degradation.
154, 160: Oxygen sensor does not show either a rich or lean condition – may need replacement. Oxygen sensor stuck or not switching between rich and lean, likely requiring replacement.
171, 174: The oxygen sensor is saying that the system air/fuel mix is far too lean (too much fuel is being added as a correction). Lean fuel mixture condition, indicated by oxygen sensor readings.
172, 175: The oxygen sensor is saying that the system air/fuel mix is far too rich (too much air is being added as a correction). Rich fuel mixture condition, indicated by oxygen sensor readings.
176, 178, 179: Flex fuel sensor can’t be seen/problem. Issues with the Flex Fuel Sensor in vehicles equipped with flex-fuel capability.
182, 183: Compressed natural gas temperature sensor problem. Problems with the CNG temperature sensor in CNG-fueled vehicles.
201-208: Injector #1-#8 control circuit problem (open or shorted). Fuel injector circuit problems for specific cylinders (1 through 8).
300: Misfire detected in multiple cylinders. Random misfire detected across multiple cylinders.
301-308: Misfire detected in cylinder #1-#8. Misfire detected in a specific cylinder (1 through 8).
320: Crankshaft position sensor reference signal cannot be found while the engine is cranking. Crankshaft Position Sensor (CKP) signal missing during engine cranking.
325, 330: Knock sensor (#1/#2) signal is wrong. Issues with Knock Sensor signals from sensor 1 or 2.
340: No camshaft signal being received by the computer. Camshaft Position Sensor (CMP) signal missing.
350: A coil is drawing too much current. Ignition coil drawing excessive current.
351-358: Coil #1-#8 is not reaching peak current at the right time. Ignition coil peak current issue for specific cylinders (1 through 8).
401: A required change in air/fuel mixture was not detected during diagnostic test. EGR system flow insufficient.
403: An problem was detected in the EGR solenoid control circuit. EGR solenoid circuit malfunction.
404: The EGR sensor’s reported position makes no sense. EGR position sensor signal illogical.
405, 406: EGR position sensor voltage wrong. EGR position sensor voltage out of range.
412: The secondary air solenoid control circuit seems bad (this is used for the aspirator). Secondary Air Injection (SAI) solenoid circuit issue.
420, 432: The catalyst seems inefficient (#1/#2). Catalytic converter efficiency below threshold (Bank 1 or Bank 2).
441: Evaporative purge flow system not working properly. EVAP purge flow system problem.
442: A leak has been detected in the evaporative system! Small EVAP system leak detected.
443: Evaporative purge flow system solenoid not working properly. EVAP purge solenoid malfunction.
455: A large leak has been detected in the evaporative system! Large EVAP system leak detected.
456: A small leak has been detected in the evaporative system! Small EVAP system leak detected.
460, 461: The fuel level sender is not reporting any change over a long distance/time. Fuel level sensor signal issue (no change detected).
462, 463: Fuel level sender voltage wrong. Fuel level sensor voltage out of range.
500: Haven’t heard from the speed sensor lately. Vehicle Speed Sensor (VSS) signal missing or intermittent.
505: The idle speed air control motor doesn’t seem to be working correctly. Idle Air Control (IAC) motor malfunction.
522, 523: Oil pressure sensor problems. Oil pressure sensor circuit issues.
551: The power steering switch may not be working. (Neons: high pressure is showing up at high speed). Power steering pressure switch problem.
600: Oh-oh! The coprocessors aren’t talking to each other within the computer! Internal ECU communication error.
601, 604, 605: Internal computer error! (RAM check/ROM). Internal ECU memory (RAM or ROM) error.
615: Starter relay circuit problem. Starter relay circuit malfunction.
622: Generator field control problem. Alternator field control circuit issue.
645: A/C clutch relay circuit problem. A/C clutch relay circuit malfunction.
700: The automatic transmission computer or Aisin computer has a problem – ask it what’s going on. I don’t know. Generic transmission control system fault. Requires further diagnosis using transmission-specific codes.
703: Brake switch circuit information seems wrong. Brake switch circuit signal issue.
711: Based on the transmission temperature and its operations, it looks like the transmission temperature sensor’s gone bad. Transmission Temperature Sensor malfunction suspected based on transmission behavior.
712, 713: Transmission fluid temperature sensor voltage wrong. Transmission Fluid Temperature (TFT) sensor voltage out of range.
720: The Output Shaft Speed Sensor doesn’t match the reported vehicle speed. Output Shaft Speed Sensor (OSS) signal inconsistent with vehicle speed.
740: The engine’s running faster than it should for these speeds, so I think the torque converter clutch lock-up system is bad. Torque Converter Clutch (TCC) lock-up system problem.
743: Torque converter clutch (part throttle unlock) solenoid circuit problem – shift solenoid C electrical fault. TCC part throttle unlock solenoid circuit issue.
748: Governor Pressure Solenoid circuit problem (Transmission relay circuit problem in Jeep RE transmissions). Governor Pressure Solenoid circuit malfunction (or transmission relay issue in specific Jeep transmissions).
751: Overdrive override switch has been pressed for over five minutes. Just thought you should know. Informational code indicating prolonged overdrive override switch activation.
753: Overdrive solenoid control circuit problem (transmission relay circuit in Jeep RE transmissions.). Overdrive solenoid circuit issue (or transmission relay problem in specific Jeep transmissions).
756: Shift solenoid B (2-3) fault. Transmission Shift Solenoid B (2-3 shift) malfunction.
783: The overdrive solenoid can’t go from 3rd gear to the overdrive gear. Transmission overdrive solenoid unable to engage overdrive.
801: Transmission reverse gear lockout solenoid circuit problem! Transmission Reverse Gear Lockout Solenoid circuit malfunction.
833: Problem with the clutch-released switch circuit? Manual transmission clutch release switch circuit issue.
1192, 1193: Inlet air temperature sensor voltage is wrong. Inlet Air Temperature (IAT) sensor voltage out of range.
1194: Oxygen sensor heater performance is faulty. Oxygen sensor heater performance issue.
1195, 1196, 1197: The oxygen sensor switched too slowly (bank 1/bank 2). Slow oxygen sensor response time (Bank 1 or Bank 2).
1198, 1199: Radiator coolant temperature sensor voltage is wrong. Radiator Coolant Temperature sensor voltage out of range.
1281: The engine is staying cold too long – check your thermostat. Engine taking too long to reach operating temperature, likely thermostat related.
1282: The fuel pump relay circuit seems to be having a problem. Fuel pump relay circuit malfunction.
1288: The intake manifold short runner tuning valve circuit seems to be having a problem. Intake Manifold Runner Control (IMRC) valve circuit issue.
1289: There’s a problem in the manifold tuning valve solenoid control circuit. IMRC solenoid control circuit malfunction.
1290: Compressed natural gas system pressure is too high. CNG system pressure too high.
1291: The heated air intake sensor does not seem to be working. Heated Air Intake (HAI) sensor malfunction.
1292, 1293: Natural gas pressure sensor issue. CNG pressure sensor problem.
1294: Can’t get to target engine speed, check for vacuum leaks and idle speed motor issues. Idle speed control issue, potentially due to vacuum leak or IAC motor.
1295: The throttle position sensor doesn’t seem to be getting enough electricity. TPS low voltage supply.
1296: The MAP sensor doesn’t seem to be getting enough electricity. MAP sensor low voltage supply.
1297: The MAP sensor doesn’t change its reading when the engine is running! MAP sensor signal stuck or unchanging.
1298: During wide-open throttle, the engine runs lean. Lean condition at Wide Open Throttle (WOT).
1299: MAP Sensor and Throttle Position Sensor signals don’t match, check for a vacuum leak. Inconsistent MAP and TPS signals, suggesting a vacuum leak.
1388: Auto shutdown relay circuit problems? Automatic Shutdown (ASD) relay circuit malfunction.
1389: No Z1 or Z2 voltage seen by the computer when the auto shutdown relay is used. ASD relay voltage supply issue.
1390: Cam and crank signals don’t match – did the timing belt skip a tooth? Camshaft and Crankshaft sensor signals out of sync, potentially timing belt/chain issue.
1391: Sometimes, I can’t see the crank or cam sensor signal. Intermittent Crankshaft or Camshaft sensor signal loss.
1398: I can see the Crank Sensor’s signal when I prepare for Misfire Diagnostics. Try replacing it. Crankshaft sensor issue detected during misfire diagnostics, suggesting sensor replacement.
1399: Problem in the Wait to Start Lamp circuit – (diesels only?). Diesel “Wait to Start” lamp circuit issue.
1403: EGR position sensor not getting (enough) voltage. EGR position sensor low voltage supply.
1476: Too little secondary air injection during aspirator test. Secondary Air Injection (SAI) system flow too low during test.
1477: Too much secondary air injection during aspirator test. SAI system flow too high during test.
1478: Battery temperature sensor voltage wrong. Battery Temperature Sensor voltage out of range.
1479: Transmission fan relay circuit problems? Transmission fan relay circuit malfunction.
1480: PCV solenoid circuit problems? Positive Crankcase Ventilation (PCV) solenoid circuit issue.
1481: Transmission RPM pulse generator signal for misfire detection seems wrong. Transmission RPM sensor signal issue for misfire detection.
1482: Catalyst temperature sensor circuit shorted low. Catalyst Temperature Sensor circuit short to ground.
1483: Catalyst temperature sensor circuit shorted high. Catalyst Temperature Sensor circuit short to voltage.
1484: The catalyst seems to be overheating! Catalytic converter overheating condition.
1485: Air injection solenoid circuit problems. Air Injection solenoid circuit malfunction.
1486: Pinched or blocked hose in the evaporative hose system. EVAP system hose blockage or restriction.
1487: Control circuit of the #2 high-speed radiator fan control relay is having problems. High-speed radiator fan relay #2 control circuit issue.
1488: Auxiliary 5-volt sensor feed is too low. Auxiliary 5V sensor reference voltage low.
1489, 1498: High speed radiator fan control circuit problem. High-speed radiator fan control circuit malfunction.
1490: Low speed radiator fan control circuit problem. Low-speed radiator fan control circuit malfunction.
1491: Radiator fan control circuit problem (may be solid state relays as well as other circuits). Generic radiator fan control circuit issue.
1492, 1493: Ambient or battery temperature sensor voltage wrong. Ambient or Battery Temperature sensor voltage out of range.
1494: Leak Detection Pump (LDP) pressure switch problem – electrical or the pump itself. Leak Detection Pump (LDP) pressure switch electrical or mechanical issue.
1495: Leak Detection Pump (LDP) pressure switch problem – the solenoid circuit. LDP pressure switch solenoid circuit malfunction.
1496: Sensor feed is below an acceptable limit. (under 4v for 4 seconds – should be 5v). Generic sensor reference voltage low.
1594: Voltage too high in charging system. Charging system over voltage.
1595: Speed control vacuum or vent solenoid control circuits shorted or lost. Speed control vacuum/vent solenoid circuit issue.
1596: Speed control switch always high. Speed control switch signal stuck high.
1597: Speed control switch always low. Speed control switch signal stuck low.
1598: A/C pressure sensor voltage high. A/C pressure sensor voltage high.
1599: A/C pressure sensor voltage low. A/C pressure sensor voltage low.
1681: No messages received from the cluster control module (dashboard computer). Communication loss with Instrument Cluster Control Module (ICCM).
1682: Charging system doesn’t seem to be working well. Check alternator, etc. Charging system malfunction, requiring alternator and related component inspection.
1683: Speed control servo power control circuit problem. Speed control servo power circuit malfunction.
1684: The battery has been disconnected within the last 50 starts. Informational code indicating recent battery disconnection.
1685: Invalid key received from the Smart Key Immobilizer Module. Smart Key Immobilizer Module (SKIM) invalid key detected.
1686: No messages received from the Smart Key Immobilizer Module. Communication loss with SKIM.
1687: No messages received from the Mechanical Instrument Cluster module. Communication loss with Mechanical Instrument Cluster (MIC).
1693: The companion engine control module has shown a fault. Fault detected in companion ECU (in multi-ECU systems).
1694: No messages received from the powertrain control module-Aisin transmission. Communication loss with Powertrain Control Module (PCM) for Aisin transmission.
1695: No messages received from the body control module. Communication loss with Body Control Module (BCM).
1696: Unsuccessful attempt to write to an EEPROM location! ECU EEPROM write failure.
1697: Unsuccessful attempt to update Service Reminder Indicator (SRI or EMR) mileage! Service Reminder Indicator (SRI) mileage update failure.
1698: No messages received from the electronic transmission control module or the Aisin transmission controller. Communication loss with Electronic Transmission Control Module (ETCM) or Aisin transmission controller.
1719: Transmission 2-3 gear lockout solenoid control circuit problem. Transmission 2-3 gear lockout solenoid circuit issue.
1740: Either the tcc solenoid or overdrive solenoid systems doesn’t seem to be making much sense. Torque Converter Clutch (TCC) or Overdrive solenoid system fault.
1756, 1757: Transmission control pressure not equal to target. (Mid/Zero pressure problem). Transmission control pressure deviation from target (mid or zero pressure).
1762: The Governor Pressure Sensor input was too high or too low for 3 consecutive park/neutral calibrations. Governor Pressure Sensor signal out of range during park/neutral calibration.
1763: The Governor Pressure Sensor input is too high. Governor Pressure Sensor signal too high.
1764: The Governor Pressure Sensor input is too low. Governor Pressure Sensor signal too low.
1765: Open or short in the Transmission Relay control circuit. Transmission relay control circuit open or short.
1899: The Park/Neutral switch seems to be stuck! Park/Neutral (PNP) switch malfunction or stuck.

Conclusion: Empowering Chrysler Owners with OBD2 Knowledge

Understanding Chrysler OBD2 codes is a powerful first step in diagnosing and addressing vehicle issues. By learning how to retrieve these codes and decipher their meanings, you can gain valuable insights into your vehicle’s health. While this guide provides a comprehensive overview, remember that it is essential to consult with a qualified automotive technician for accurate diagnosis and professional repairs. Armed with this knowledge, you can approach vehicle maintenance with greater confidence and ensure your Chrysler, Dodge, Jeep, or RAM vehicle remains reliable on the road.