What does code P0601 mean?

Q: What does code P0601 mean?

Internal Control Module Memory Checksum Error. P0601 means the engine control module (ECM) or powertrain control module (PCM) has detected a checksum error in its own internal memory, indicating that the data stored in its non-volatile memory has become corrupted. The computer runs a self-test on its memory at key-on and during operation, and when the calculated checksum does not match the expected value, it sets this code and may illuminate the check engine light.

DTC codes / P06xx · Computer and output circuits / P0601

P0601Internal Control Module Memory Checksum Error

P0601 means the engine control module (ECM) or powertrain control module (PCM) has detected a checksum error in its own internal memory, indicating that the data stored in its non-volatile memory has become corrupted. The computer runs a self-test on its memory at key-on and during operation, and when the calculated checksum does not match the expected value, it sets this code and may illuminate the check engine light.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaComputer and output circuits

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.