What does code P1625 mean?

Q: What does code P1625 mean?

PCM System Reset / TCM Flash Checksum Fault. P1625 on a GM vehicle indicates that the Powertrain Control Module (PCM) has detected a checksum error in the flash memory of the Transmission Control Module (TCM), or that the PCM itself has reset unexpectedly. The PCM monitors the integrity of the TCM's calibration data and sets this code when the calculated checksum does not match the stored value, often after a failed reprogramming event or a voltage interruption.

DTC codes / GM codes / P1625

P1625 · GMPCM System Reset / TCM Flash Checksum Fault

P1625 on a GM vehicle indicates that the Powertrain Control Module (PCM) has detected a checksum error in the flash memory of the Transmission Control Module (TCM), or that the PCM itself has reset unexpectedly. The PCM monitors the integrity of the TCM's calibration data and sets this code when the calculated checksum does not match the stored value, often after a failed reprogramming event or a voltage interruption.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyProfessional

AreaComputer and output circuits

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