Powertrain, generic (extended)

P2372 Fuel Volume Regulator B Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Control wire chafed through to ground
Moisture in the regulator connector
Internal short in the regulator coil

Symptoms

  • Check engine light on
  • Rail pressure too high or too low depending on the affected side
  • Limp-home with reduced power

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

P2373P2370P2371P0003P0087

References: fordservicecontent.com, serdia.deutz.com, law.cornell.edu.