Powertrain, generic · Computer and auxiliary outputs

P0631 VIN Not Programmed or Incompatible TCM

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P0631 is the transmission module counterpart of P0630: the transmission control module holds no VIN, an invalid one, or one that does not match the vehicle – usually compared with the VIN of the engine or body module. Typical is a replaced transmission module or mechatronic unit (on dual-clutch and automatic gearboxes with integrated control) that was not VIN-programmed, or a used part. Depending on the architecture the transmission module itself or the engine module sets the code. No manufacturer table or bulletin available to us names P0631; the description follows CARB's VIN rules and the documented P0630 procedure (Hyundai, Ford), where the VIN is distributed to all modules that need it and stored once. Shifting is usually normal, but adaptations or configuration may be blocked.

Likely causes

Transmission module or mechatronic unit replaced, VIN not written
Used transmission module from another vehicle
Interrupted transmission module programming
CAN communication fault during the VIN comparison

Symptoms

  • Check engine light or transmission warning
  • Scan tool shows no or a wrong VIN in the transmission module
  • Transmission adaptation possibly impossible
  • Driving often normal

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–250
Time0.3–1 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission control modulevehicle configuration data

Related codes

P0630P0614P0613P0610

References: law.cornell.edu, static.nhtsa.gov, newtonnet.co.uk.