P0631

2017-10-10

Description:

  • The fault code P0631 indicates that there is a problem with the Vehicle Identification Number (VIN) not being programmed or being incompatible with the Transmission Control Module (TCM). This may cause the vehicle to not start or have issues with shifting gears.

Possible Symptoms:

  • Vehicle may not start

  • Issues with shifting gears

  • Illuminated check engine light

  • Reduced engine power or acceleration

Possible Causes:

  • TCM software needs to be updated

  • TCM or PCM has been replaced and VIN needs to be programmed

  • TCM or PCM has failed

  • Wiring or connections in the circuit are faulty

Related Parts:

  • Engine Control Module (ECM): ECM is the part of the car computer that controls the engine system and performance. Problems lead to poor fuel economy, engine stalling & unwanted engine vibrations

Possible Solutions:

  • Update the TCM software

  • Program the VIN into the TCM or PCM

  • Replace the TCM or PCM if necessary

  • Check and repair any damaged wiring or connections

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