P2371 code meaning
Fuel Volume Regulator B Control Circuit Performance
Powertrain system Generic code P23xx codes Check engine light
What P2371 means
P2371 is a functional fault of the second fuel volume regulator: the control circuit works electrically, but the valve does not achieve what the ECM asks of it. No manufacturer publishes a definition for regulator B, so the A side helps. Deutz's EMR controller, for example, compares the regulator current with its set point and records separate faults when it stays above or below it, plus a plausibility check of the current. Ford's 2023 diesel uses its P0002 for a different case – the driver stage in the ECM getting hotter than 170 °C. CARB also requires a fault when fuel pressure control reaches its limits and the commanded pressure can no longer be delivered. A sticking valve, dirt in the fuel or a worn pump are the usual causes.
P2371 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 P2371
- Check engine light on
- Rail pressure fluctuates or misses its target
- Reduced power under load
Common causes of P2371
- Most likelyRegulator B valve sticking from dirt or wear
- PossibleHigh-pressure pump B worn
- Less likelyECM driver stage overheating
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 P2371 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. |
| 71 | The exact fault in that area. |
What to do next
- Note P2371 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 P2371
What does P2371 mean?
P2371 means "Fuel Volume Regulator B Control Circuit Performance". P2371 is a functional fault of the second fuel volume regulator: the control circuit works electrically, but the valve does not achieve what the ECM asks of it. It is a generic code, so it means the same on every make.
Is it safe to drive with P2371?
Drive gently and only to a workshop. With P2371 the car can go into limp mode (reduced power) to protect itself.
Will P2371 fail an emissions test?
Yes, it can. P2371 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 P2371 to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P2371 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.