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P1678 – CAN Communication Error (Body Control Module)

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Symptoms

  • Warning lights
  • Electrical issues

Causes

  • Wiring fault
  • BCM failure
  • CAN bus issue

Diagnosis

  • Inspect wiring
  • Check CAN signals
  • Scan BCM

Repair

  • Repair wiring
  • Replace BCM
  • Repair CAN network
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