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P1693 – DTC Detected in Companion Module

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Symptoms

  • Warning lights
  • Reduced performance

Causes

  • TCM/ABS/BCM fault
  • Wiring issue
  • CAN bus issue

Diagnosis

  • Scan all modules
  • Inspect wiring
  • Check CAN signals

Repair

  • Repair wiring
  • Replace faulty module
  • Repair CAN network
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