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2015 FORD F-150
5.0L V8 Coyote•RWD•AUTOMATIC•gas
14 active safety recalls on this vehicle — view recalls
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Repairs420Labor1001Torque8720Fluid18DTC3190Battery2Maintenance0Recalls14
P0690moderate severityPowertrain

ECM/PCM Power Relay Sense Circuit High

on 2015 Ford F-150 5.0L V8 Coyote · RWD

What this code means

The PCM detected a high voltage on the power relay sense circuit when it should be low. This usually means the main power relay is staying energized or there is a wiring fault feeding voltage back to the PCM.

Symptoms

  • Check engine light on
  • Hard starting or no start
  • Battery drain when parked

Common causes

  • Faulty main/ECM power relay
  • Short to voltage in sense circuit wiring
  • Corroded or damaged relay connector
  • Failed PCM

Diagnostic steps

  1. Scan and record freeze frame data
  2. Inspect power relay and connector for corrosion
  3. Test relay operation and sense circuit voltage
  4. Check wiring for short to power
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