P0631 OBD II Trouble Code VIN Not Programmed or Incompatible ? TCM

How to easily diagnose, repair, and info on causes of a P0631 trouble code that indicates a VIN that is not programmed or incompatible.

Symptoms of P0631 OBD II Trouble Code

  • Erratic or harsh transmission shift patterns
  • Engine shutdown (especially when rolling to a halt)
  • Vehicle security system may be activated
  • Other diagnostic codes will likely be stored

Common Causes of P0631 OBD II Trouble Code

  • TCM programming error
  • TCM swapped between vehicles or replaced without being properly programmed
  • TCM failure

Severity of P0631 OBD II Trouble Code

Since automatic transmission function will be adversely affected without VIN recognition by the TCM, a stored code P0631 should be categorized as severe.