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2017 FORD F-150
3.5L V6 EcoBoost•RWD•AUTOMATIC•gas•turbo
18 active safety recalls on this vehicle — view recalls
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Repairs418Labor1009Torque7006Fluid18DTC3814Battery2Maintenance0Recalls18
P0891high severityPowertrain

TCM Power Relay Sense Circuit Signal Stuck Off

on 2017 Ford F-150 3.5L V6 EcoBoost · RWD

What this code means

The transmission control module sees the power relay sense signal stuck in the off state. The relay is not energizing when commanded on.

Symptoms

  • Transmission warning light on
  • Transmission enters limp mode
  • No shifting response

Common causes

  • Faulty TCM power relay
  • Open circuit in sense wiring
  • Corroded or loose connectors
  • Faulty transmission control module

Diagnostic steps

  1. Scan for related transmission codes
  2. Test relay energizing operation
  3. Check sense circuit for open
  4. Inspect connectors and wiring
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