P2373Fuel Volume Regulator B Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2373 points to too much voltage or current in the control circuit of fuel volume regulator B, typically from a short to battery voltage or a shorted coil. No manufacturer publishes the B version; P0004 on regulator A is the model. Ford's 2023 diesel sets that code when the energised valve draws more than 3.7 A, while 2.2 A is the normal maximum. Deutz's EMR controller lists a short to battery on the high side as P0004-00 and treats critically high output current separately. Ford's gasoline summary explains why ECMs guard this circuit closely: the coil can overheat and fail when battery voltage sits on it permanently. A protecting driver switches off, so regulator B stops metering and rail pressure drifts, often with reduced power.
- What you may notice
- Check engine light on
- Reduced power or limp-home mode
- Rail pressure deviation codes stored as well
- Likely causes
- LikelyControl wire shorted to battery voltage
- PossibleRegulator coil with shorted turns drawing excess current
- RareECM output stage faulty
- 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.