OBD-II code · Powertrain (generic)
P009D Fuel Pressure Relief Control Circuit High
Pressure relief solenoid control voltage above expected range — short to power or open 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 P009D?
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 battery
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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
- P009AIntake Air Temperature/Ambient Air Temperature Correlation
- P009BFuel Pressure Relief Control Circuit/Open
- P009CFuel Pressure Relief Control Circuit Low
- P009EFuel Pressure Relief Control Performance/Stuck Off
- P009FFuel Pressure Relief Control Stuck On
- P00A0Charge Air Cooler Temperature Sensor Circuit Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.