P1629 – Immobilizer ECM Signal Fault (Nissan)

Description

The ECM detected an abnormal immobilizer signal related to ECM authorization.

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Symptoms

  • No start
  • Security light

Causes

  • ECM mismatch
  • Signal corruption
  • Wiring issue

Diagnosis

  • Check ECM ID
  • Scan NATS data
  • Inspect wiring

Repair

  • Reprogram ECM
  • Repair wiring