P2370 code meaning
Fuel Volume Regulator B Control Circuit/Open
Powertrain system Generic code P23xx codes Check engine light
What P2370 means
A fuel volume regulator is the solenoid valve at the high-pressure pump that decides how much of the pump's stroke reaches the rail. Regulator B only exists where a second valve or second pump is fitted – the 5.2 litre V10 of Audi and Lamborghini, for instance, has two cam-driven high-pressure pumps for its two rails. No manufacturer documents P2370 publicly; GM's 2025 diesel table handles a second metering valve under P233A–P233C instead. The A counterparts show the logic: Ford wires its gasoline FVR with both high and low side to the PCM and monitors it continuously, and Ford's 2023 diesel sees an open valve as 2.8–4.8 V at the driver while the valve is off. Without current, delivery from pump B depends on the valve's resting state.
P2370 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2370
- Check engine light on
- Rail pressure deviation and possible reduced power
- Hard starting
Common causes of P2370
- Most likelyConnector at regulator B loose or corroded
- PossibleRegulator coil burnt open
- PossibleBroken high-side or low-side wire
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel volume regulator bHigh pressure fuel pumpFuel volume regulator wiring
What each part of P2370 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| 70 | The exact fault in that area. |
What to do next
- Note P2370 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 P2370
What does P2370 mean?
P2370 means "Fuel Volume Regulator B Control Circuit/Open". A fuel volume regulator is the solenoid valve at the high-pressure pump that decides how much of the pump's stroke reaches the rail. It is a generic code, so it means the same on every make.
Is it safe to drive with P2370?
Drive gently and only to a workshop. With P2370 the car can go into limp mode (reduced power) to protect itself.
Will P2370 fail an emissions test?
Yes, it can. P2370 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 P2370 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2370 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.