Engine and gearbox (P)
P0002: Fuel Volume Regulator A Issue
This code means that the fuel volume regulator A is not performing as expected. The control signal is present, but the actual fuel rail pressure does not match the target value.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Engine may run rough
- Reduced power
- Poor fuel economy
- Check engine light on
Common causes
- High-pressure pump worn or leaking internally
- Regulator valve sticking from contamination
- Rail pressure sensor reading drifted
How to check it yourself
- Inspect for fuel leaks around the high-pressure pump
- Check the fuel filter for contamination
- Test the fuel rail pressure sensor
- Examine the regulator valve for sticking
Can I keep driving?
The car can be driven, but performance may be reduced.
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer