OBD-II code · Powertrain (generic)
P009C Fuel Pressure Relief Control Circuit Low
Pressure relief solenoid control voltage below expected range — short to ground. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P009C?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyWiring shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
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
- P0099Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1
- P009AIntake Air Temperature/Ambient Air Temperature Correlation
- P009BFuel Pressure Relief Control Circuit/Open
- P009DFuel Pressure Relief Control Circuit High
- P009EFuel Pressure Relief Control Performance/Stuck Off
- P009FFuel Pressure Relief Control Stuck On
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.