P00C9Fuel Pressure Regulator A Solenoid Supply Voltage Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Some engine control modules switch the solenoid of fuel pressure regulator A on both sides: the ground side is monitored by P0090 to P0092, the supply side (high-side driver) by P00C8 to P00CA. On gasoline direct injection the regulator is typically the control valve on the high-pressure pump; on some diesels it is the regulator designated as regulator 1. P00C9 reports a short to ground on the supply side. Rail pressure can then not be controlled, causing starting problems, stalling or reduced power; documented systems turn on the warning light in the first drive cycle.
- What you may notice
- Check engine light on
- Hard starting or stalling
- Loss of power or limp mode
- Likely causes
- LikelySupply wire to the solenoid chafed and shorted to ground
- PossibleSolenoid coil shorted
- PossibleWater or corrosion in the connector
- RareHigh-side driver in the engine control module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.