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2006 MAZDA MPV
3.0L V6•FWD•AUTOMATIC•gas
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor486Torque3100Fluid7DTC1789Battery1Maintenance0Recalls2
P1603high severityPowertrain

Immobilizer System Malfunction (ECM/Immobilizer)

on 2006 Mazda MPV 3.0L V6 · FWD

What this code means

The PCM detects a malfunction between the ECM and immobilizer system. This can prevent normal engine starting.

Symptoms

  • No-start condition
  • Security indicator on
  • Key not recognized

Common causes

  • Faulty immobilizer module
  • Unprogrammed or faulty key
  • Damaged wiring or connector
  • Faulty PCM

Diagnostic steps

  1. Scan for immobilizer fault codes
  2. Verify key programming
  3. Inspect module wiring and connections
  4. Reprogram or replace faulty component
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Other Powertrain codes on this vehicle

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