AutoCodes – Generic – P0631

P0631 Code - VIN Not Programmed or Incompatible - TCM

Quick Answer

On some vehicle the Vehicle Identification Number (VIN) is stored in the Engine Control Module (ECM). Common causes include VIN Not Programmed to Transmission Control Module (TCM), VIN Incompatible to Transmission Control Module (TCM). Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P0631 indicates VIN Not Programmed or Incompatible - TCM.
Common causes: Common causes include VIN Not Programmed to Transmission Control Module (TCM), VIN Incompatible to Transmission Control Module (TCM).
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 3,724

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 01, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0631 Description

On some vehicle the Vehicle Identification Number (VIN) is stored in the Engine Control Module (ECM).

OBDII Code P0631 - VIN Not Programmed or Incompatible - TCM - AutoCodes.com — P0631 Code - VIN Not Programmed or Incompatible - TCM

What does this mean?

What are the Possible Causes of the DTC P0631?

VIN Not Programmed to Transmission Control Module (TCM)
VIN Incompatible to Transmission Control Module (TCM)

How to Fix the DTC P0631?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0631 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.