OBD-II code · Powertrain (generic)
P009B Fuel Pressure Relief Control Circuit/Open
Open circuit at fuel pressure relief solenoid (used to bleed off rail pressure during certain operating modes).
Is it safe to drive with P009B?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyWiring break
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
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
- Parts involved
- Pressure Relief Solenoid, Solenoid Wiring
Related codes
- P0098Intake Air Temperature Sensor 2 Circuit High Bank 1
- P0099Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1
- P009AIntake Air Temperature/Ambient Air Temperature Correlation
- P009CFuel Pressure Relief Control Circuit Low
- P009DFuel Pressure Relief Control Circuit High
- P009EFuel Pressure Relief Control Performance/Stuck Off
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.