Powertrain, generic · Fuel and air metering, auxiliary emission controls

P00CB Fuel Volume Regulator Solenoid Supply Voltage Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The fuel volume regulator is the solenoid valve that meters how much fuel the high-pressure pump delivers (metering unit on diesels, pump control valve on some gasoline direct-injection engines). Many control modules switch such solenoids on both sides; P0001 to P0004 cover the control side, while these codes cover the supply side (high-side driver). P00CB reports an open circuit on the supply side. Rail pressure may then deviate, with reduced power or hard starting. None of the published manufacturer documents searched uses this code; the explanation follows regulations and comparable manufacturer monitors.

Likely causes

Supply wire broken or connector corroded
Regulator coil open or shorted (often built into the pump)
High-side driver in the engine control module faulty

Symptoms

  • Check engine light on
  • Loss of power or limp mode
  • Hard starting or jerking

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–900
Time1–4 h

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

Parts involved

fuel volume regulatorfuel volume regulator wiringhigh pressure fuel pumpengine control module

Related codes

P00CCP00CDP0001P0003P0004P00C8

References: law.cornell.edu, newtonnet.co.uk, gsi.ext.gm.com.