P0685

2017-10-10

Description:

  • The fault code P0685 indicates that there is an issue with the power relay control circuit that controls the Engine Control Module/Powertrain Control Module (ECM/PCM). This may cause the vehicle to not start or the engine to run poorly.

Possible Symptoms:

  • Engine may not start

  • Illuminated check engine light

  • Poor engine performance

  • Reduced fuel efficiency

  • Stalling or hesitation during acceleration

Possible Causes:

  • Failed ECM/PCM power relay

  • Faulty wiring or connections in the circuit

  • Loose or corroded electrical connections

  • Failed ECM/PCM

Related Parts:

  • Engine Control Module (ECM): ECM is the part of the car computer that controls the engine system and performance. Problems lead to poor fuel economy, engine stalling & unwanted engine vibrations

Possible Solutions:

  • Replace the ECM/PCM power relay

  • Check and repair any damaged wiring or connections

  • Tighten or clean any loose or corroded electrical connections

  • Replace the ECM/PCM if necessary

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