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P1639 – Vehicle Identification Number (VIN) Mismatch

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Symptoms

  • Warning lights
  • No start (some models)

Causes

  • ECM replacement
  • Incorrect coding
  • Immobilizer mismatch

Diagnosis

  • Scan ECU
  • Check VIN coding
  • Inspect immobilizer

Repair

  • Recode ECM
  • Program immobilizer
  • Repair wiring
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