Encountering OBD2 fault codes after vehicle repairs can be perplexing, especially when these codes persist despite your best efforts. This article delves into the intricacies of historic fault codes, specifically addressing the P0603 (Internal Control Module Keep Alive Memory (KAM) error) and P1217 (Powertrain Engine Over Temperature (Overheat)) codes. We’ll explore why these Historic Fault Obd2 codes can lead to smog test failures and discuss potential solutions for vehicle owners facing this frustrating situation.
Historic fault codes, unlike active or pending codes, represent past issues that are no longer currently detected by the vehicle’s computer. In the case of a recently repaired 2012 Nissan Altima 2.5S, which was in an accident and experienced airbag deployment and a brief engine overheat, the presence of P0603 and P1217 as historic codes is noteworthy. Even after crash sensor and seat belt replacement, SRS module reset, and general repairs, these codes stubbornly remain. Standard OBD2 scanners like Torque Pro, Autel Maxisys Elite, and Launch X431 may report these codes, but attempting to erase them often proves unsuccessful, with the codes reappearing immediately.
The P0603 code indicates a Keep Alive Memory (KAM) error within the internal control module, often related to power interruptions or ECU issues. The P1217 code signals a past Engine Over Temperature event. While the vehicle may be running smoothly without a check engine light or pending codes, these historic faults can still trigger a smog test failure. This is because emissions testing centers often check for all stored codes, not just active ones.
One commonly cited solution for clearing historic DTCs is to complete numerous warm-up cycles – sometimes suggested as forty consecutive cycles without recurrence of the fault. Another recommendation might be to drive a significant distance, such as 400 miles, to allow the system to fully reset. However, the practicality of such advice can be questionable, especially when facing vehicle registration deadlines or limited driving opportunities. Furthermore, the effectiveness of these methods in definitively clearing persistent historic fault obd2 codes is not always guaranteed.
For vehicle owners struggling with non-erasable historic fault codes and facing smog test failures, it’s crucial to consider further diagnostic steps. While driving cycles might work in some scenarios, persistent codes like P0603 and P1217 may indicate underlying issues requiring professional attention. Consulting a qualified mechanic or a specialist in automotive electronics may be necessary to accurately diagnose and resolve the root cause of these historic faults and ensure successful smog test completion. It’s possible that a more advanced diagnostic scan or ECU inspection is needed to properly address these persistent historic OBD2 codes.
