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2003 FORD F-150
5.4L V8 Supercharged•4WD•AUTOMATIC•gas•supercharged
11 active safety recalls on this vehicle — view recalls
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Repairs0Labor326Torque3064Fluid9DTC1704Battery1Maintenance0Recalls11
P0946moderate severityPowertrain

Hydraulic Pump Relay Circuit Range/Performance

on 2003 Ford F-150 5.4L V8 Supercharged · 4WD

What this code means

The hydraulic pump relay circuit is reading a value outside the expected range. The signal is present but not performing as the PCM expects.

Symptoms

  • Erratic shifting
  • Transmission warning light on
  • Intermittent transmission problems

Common causes

  • Failing hydraulic pump relay
  • Poor electrical connection or corrosion
  • Damaged relay circuit wiring
  • Faulty PCM/TCM

Diagnostic steps

  1. Inspect relay and connector for corrosion
  2. Monitor relay circuit voltage with scan tool
  3. Test relay under load
  4. Check wiring for high resistance
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