OBD Guide
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P0631

VIN Not Programmed or Incompatible - TCM

P0631 is an OBD-II diagnostic trouble code meaning: VIN Not Programmed or Incompatible - TCM. Common causes: installing a used or new tcm without vin programming, damage to tcm memory storing vin. Estimated repair cost: $22–89.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–89 (est.)

Symptoms

  • The Check Engine light comes on
  • Automatic transmission in emergency mode
  • TCM and Engine ECU Compatibility Errors
  • Problems after replacing the transmission ECU
  • Possible malfunctions of the immobilizer

Causes

  • Installing a used or new TCM without VIN programming
  • Damage to TCM memory storing VIN
  • Incompatible TCM from a different model or year
  • Error when reprogramming TCM
  • Physical corruption of TCM memory

How to Fix

  1. Read VIN from TCM via professional diagnostic scanner
  2. Compare with actual vehicle VIN
  3. Program VIN into TCM via dealer scanner
  4. Check TCM compatibility according to the spare parts catalog
  5. Perform the TCM pairing procedure with the engine ECU
  6. Adapt the automatic transmission after programming

Related codes

P0630P0614P0613P0632P0700

Error P0631 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0631 code mean?

P0631 is an OBD-II diagnostic trouble code that indicates: VIN Not Programmed or Incompatible - TCM

What causes a P0631 error code?

The most common causes of P0631 include: Installing a used or new TCM without VIN programming; Damage to TCM memory storing VIN; Incompatible TCM from a different model or year; Error when reprogramming TCM.

How do I fix a P0631 diagnostic trouble code?

To fix P0631: Read VIN from TCM via professional diagnostic scanner. Compare with actual vehicle VIN. Program VIN into TCM via dealer scanner. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0631?

Yes, but get it checked soon

How much does it cost to fix P0631?

The estimated repair cost for P0631 is $22–89. Actual cost depends on your vehicle, location, and labor rates.

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