P1615 – NATS ECM/IMMU Communication (Nissan)

Description

The ECM detected a communication malfunction between ECM and immobilizer unit.

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Symptoms

  • No start
  • Security light

Causes

  • Wiring issue
  • ECM mismatch
  • IMMU fault

Diagnosis

  • Check wiring
  • Scan NATS data
  • Verify ECM pairing

Repair

  • Repair wiring
  • Replace IMMU