P0631

VIN Not Programmed or Incompatible - TCM

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

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

Related codes

P0630 P0614 P0613 P0632 P0700