P1285 – Fuel Rail Pressure Control Fault
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Symptoms
- Loss of power
- Hesitation
- Surging
- Hard starting
- Check engine light
Causes
- Faulty pressure regulator
- Control solenoid fault
- Wiring issue
- Fuel pump problem
- ECU control fault
Diagnosis
- Compare commanded vs actual pressure
- Check regulator control
- Inspect wiring
- Measure pump output
- Scan live data
Repair
- Replace regulator or control solenoid
- Repair wiring
- Replace fuel pump
- Update ECU software
- Clear codes and road test