Code Definition

P0631 — VIN programing error TCM

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0631

P0631 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0631 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0631 fault code is set when the Transmission Control Module (TCM) detects an issue with the Vehicle Identification Number (VIN) programmed into its memory. This typically occurs when the VIN stored in the TCM does not match the VIN of the vehicle, or the VIN has not been programmed correctly following a replacement or reprogramming of the TCM. Proper VIN programming is essential for the TCM to ensure compatibility and correct operation of the transmission system according to the vehicle's specific parameters.

Quick Facts