P00CB code meaning
Fuel Volume Regulator Solenoid Supply Voltage Control Circuit/Open
Powertrain system Generic code P00xx codes Check engine light
What P00CB means
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.
P00CB at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P00CB
- Check engine light on
- Loss of power or limp mode
- Hard starting or jerking
Common causes of P00CB
- Most likelySupply wire broken or connector corroded
- PossibleRegulator coil open or shorted (often built into the pump)
- Less likelyHigh-side driver in the engine control module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel volume regulatorFuel volume regulator wiringHigh pressure fuel pumpEngine control module
What each part of P00CB 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. |
| CB | The exact fault in that area. |
What to do next
- Note P00CB 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 P00CB
What does P00CB mean?
P00CB means "Fuel Volume Regulator Solenoid Supply Voltage Control Circuit/Open". 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). It is a generic code, so it means the same on every make.
Is it safe to drive with P00CB?
Drive gently and only to a workshop. With P00CB the car can go into limp mode (reduced power) to protect itself.
Will P00CB fail an emissions test?
Yes, it can. P00CB 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 P00CB to fix?
Difficulty: medium. A typical repair takes 1 to 4 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P00CB clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.