OBD-II code · Powertrain (generic, extended)
P2371 Fuel Volume Regulator B Control Circuit Performance
The ECU sees implausible feedback on the control loop for fuel volume regulator B - duty cycle does not match measured rail pressure response. The regulator either reacts too slowly, sticks, or has shifted from its calibration.
Is it safe to drive with P2371?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyRegulator stem sticking due to debris or wear
- PossibleHigh-pressure pump wear changes regulator response
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Volume Regulator B, High Pressure Pump B, Fuel Rail
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.