OBD-II code · Powertrain (generic)
P00C9 Fuel Pressure Regulator A Solenoid Supply Voltage Control Circuit Low
Supply voltage to fuel pressure regulator A solenoid below expected range — fuse, relay or wiring fault.
Is it safe to drive with P00C9?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySupply fuse blown or relay failed
- 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
- 0.3–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Regulator Supply, Fuse, Relay
Related codes
- P233EFuel Pressure Regulator B Solenoid Supply Voltage Control Circuit Low
- P00C6Fuel Rail Pressure Too Low - Engine Cranking Bank 1
- P00C7Intake Air Pressure Measurement System - Multiple Sensor Correlation Bank 1
- P00C8Fuel Pressure Regulator A Solenoid Supply Voltage Control Circuit/Open
- P00CAFuel Pressure Regulator A Solenoid Supply Voltage Control Circuit High
- P00CBFuel Volume Regulator Solenoid Supply Voltage Control Circuit/Open
- P00CCFuel Volume Regulator Solenoid Supply Voltage Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.