P2372Fuel Volume Regulator B Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2372 says the line driving fuel volume regulator B is pulled too low, as a rule by contact with ground. No manufacturer documents this B code publicly; it mirrors P0003 on regulator A. Ford's 2023 diesel detects that condition with the valve switched off: the voltage reported by the driver chip then falls below 2.8 V, where about 5 V would be normal. Deutz's EMR controller files a ground short on the feeding (high-side) wire of its volume control valve under P0003-00. Which side the short touches matters: on the feed side the valve loses its current, on the switched ground side it can be energised all the time, so delivery of pump B no longer follows the command. Chafed harness sections near hot engine parts are the classic finding.
- What you may notice
- Check engine light on
- Rail pressure too high or too low depending on the affected side
- Limp-home with reduced power
- Likely causes
- LikelyControl wire chafed through to ground
- PossibleMoisture in the regulator connector
- RareInternal short in the regulator coil
- 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: €50 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.