P2370Fuel Volume Regulator B Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Check engine light on
- Rail pressure deviation and possible reduced power
- Hard starting
- Likely causes
- LikelyConnector at regulator B loose or corroded
- PossibleRegulator coil burnt open
- PossibleBroken high-side or low-side wire
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.