P1254 – Fuel Pump A Speed Control Fault
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Symptoms
- Loss of power
- Hesitation
- Surging
- Hard starting
- Check engine light
Causes
- Faulty pump module
- Control driver fault
- Wiring issue
- Poor ground
- Sensor feedback error
Diagnosis
- Check commanded vs actual pressure
- Scope control signal
- Inspect wiring
- Check grounds
- Scan live data
Repair
- Replace pump module
- Repair wiring
- Clean grounds
- Replace control module if needed
- Clear codes and retest