P0002 code meaning
Fuel Volume Regulator A Control Circuit Range/Performance
Powertrain system Generic code P00xx codes Check engine light
What P0002 means
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.
P0002 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P0002
- Check engine light on
- Loss of power or limp mode
- Jerking or unstable idle
- Hard starting or stalling
Common causes of P0002
- Most 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
- Less likelyRail pressure sensor reading wrong values
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel volume regulatorHigh pressure fuel pumpFuel volume regulator wiring
What each part of P0002 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| 02 | The exact fault in that area. |
What to do next
- Note P0002 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0002
What does P0002 mean?
P0002 means "Fuel Volume Regulator A Control Circuit Range/Performance". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0002?
Drive gently and only to a workshop. With P0002 the car can go into limp mode (reduced power) to protect itself.
Will P0002 fail an emissions test?
Yes, it can. P0002 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0002 to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P0002 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.