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1996 TOYOTA TACOMA
3.4L V6•RWD•AUTOMATIC•gas
6 active safety recalls on this vehicle — view recalls
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Repairs0Labor1006Torque2952Fluid18DTC3322Battery2Maintenance0Recalls6
P0631low severityPowertrain

VIN Not Programmed or Incompatible - TCM

on 1996 Toyota Tacoma 3.4L V6 · RWD

What this code means

The vehicle identification number is missing or mismatched in the transmission control module. Commonly seen after TCM replacement or flashing.

Symptoms

  • Check engine light on
  • Transmission-related configuration errors
  • Scan tool VIN mismatch

Common causes

  • TCM replaced without VIN programming
  • Incorrect VIN programmed
  • Module software mismatch
  • Faulty TCM

Diagnostic steps

  1. Read VIN stored in TCM with scan tool
  2. Compare stored VIN to actual VIN
  3. Program correct VIN into TCM
  4. Clear code and verify
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