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ECM/PCM Power Relay Control Circuit Open

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1 source
  • Official data (NHTSA)official_feed

What P0685 means

Avoid long trips

The main power relay control circuit for the engine control module is open.

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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.

Common causes

  • ECM/PCM Power Relay Control Circuit Open

What to check first

  1. Test the main power relay
  2. Check related fuses
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