OBD-II code · Powertrain (generic)
P009F Fuel Pressure Relief Control Stuck On
Pressure relief solenoid stays open when not commanded — rail pressure cannot build up properly.
Is it safe to drive with P009F?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySolenoid stuck open
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Pressure Relief Solenoid
Related codes
- P009CFuel Pressure Relief Control Circuit Low
- P009DFuel Pressure Relief Control Circuit High
- P009EFuel Pressure Relief Control Performance/Stuck Off
- P00A0Charge Air Cooler Temperature Sensor Circuit Bank 2
- P00A1Charge Air Cooler Temperature Sensor Circuit Range/Performance Bank 2
- P00A2Charge Air Cooler Temperature Sensor Circuit Low Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.