P00CBFuel Volume Regulator Solenoid Supply Voltage Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The fuel volume regulator is the solenoid valve that meters how much fuel the high-pressure pump delivers (metering unit on diesels, pump control valve on some gasoline direct-injection engines). Many control modules switch such solenoids on both sides; P0001 to P0004 cover the control side, while these codes cover the supply side (high-side driver). P00CB reports an open circuit on the supply side. Rail pressure may then deviate, with reduced power or hard starting. None of the published manufacturer documents searched uses this code; the explanation follows regulations and comparable manufacturer monitors.
- What you may notice
- Check engine light on
- Loss of power or limp mode
- Hard starting or jerking
- Likely causes
- LikelySupply wire broken or connector corroded
- PossibleRegulator coil open or shorted (often built into the pump)
- 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: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.