P0002Fuel Volume Regulator A Control Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The fuel volume regulator (also called metering unit or suction control valve) is a solenoid valve on the inlet side of the high-pressure pump, used mainly on common-rail diesel engines. The engine control module pulses it to set how much fuel the pump draws in and delivers to the rail, and in this way controls rail pressure. With P0002 the circuit is electrically intact, but command and effect do not match: the measured current does not fit the duty cycle, or rail pressure does not follow the regulator position plausibly. The cause is often mechanical, for example a sticking valve, rather than the wiring.
- What you may notice
- Check engine light on
- Loss of power or limp mode
- Jerking or unstable idle
- Hard starting or stalling
- Likely causes
- LikelyRegulator sticking or worn due to dirt, debris or water in the fuel
- PossibleHigh resistance at connector or wiring causing wrong current
- PossibleLow-pressure supply problem: clogged filter or air in the fuel
- RareRail pressure sensor reading wrong values
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.