Engine and gearbox (P)
P0004: Fuel Volume Regulator A Circuit High
The engine control unit (ECU) detects that the control voltage for the fuel volume regulator A is higher than expected. This usually indicates a short to power or an open ground return.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Check engine light on
- Poor fuel economy
- Engine hesitation
- Rough idle
Common causes
- Wiring shorted to battery voltage
- Open ground return path
- Corroded connector pins
How to check it yourself
- Inspect wiring for shorts to power
- Check ground connections for continuity
- Examine connector pins for corrosion
Can I keep driving?
The car can still be driven, but it is advisable to address the issue soon to avoid further problems.
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