Powertrain, generic (extended)

P2373 Fuel Volume Regulator B Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Control wire shorted to battery voltage
Regulator coil with shorted turns drawing excess current
ECM output stage faulty

Symptoms

  • Check engine light on
  • Reduced power or limp-home mode
  • Rail pressure deviation codes stored as well

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–2,500
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel volume regulator bhigh pressure fuel pumpfuel volume regulator wiring

Related codes

P2372P2370P2371P0004P0088

References: fordservicecontent.com, serdia.deutz.com, newtonnet.co.uk.