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2015 FORD F-150
3.5L V6 EcoBoost•RWD•AUTOMATIC•gas•turbo
14 active safety recalls on this vehicle — view recalls
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Repairs418Labor1009Torque7006Fluid18DTC3190Battery2Maintenance0Recalls14
P0685high severityPowertrain

ECM/PCM Power Relay Control Circuit /Open

on 2015 Ford F-150 3.5L V6 EcoBoost · RWD

What this code means

The PCM has detected an open condition in the power relay control circuit that supplies power to the ECM/PCM. This can cause no-start or intermittent shutdown.

Symptoms

  • Engine no-start
  • Intermittent stalling
  • Loss of PCM power

Common causes

  • Faulty PCM power relay
  • Open control circuit wiring
  • Corroded relay socket or connector
  • PCM internal fault

Diagnostic steps

  1. Check PCM power relay operation
  2. Inspect relay control circuit for open
  3. Test relay and socket connections
  4. Verify PCM power and ground
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