Powertrain, generic (extended)

P2C02 Fuel Pressure Regulator D Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2C02 is the open-circuit check on the control line of fuel pressure regulator D. In GM's tables 23OBDG07 and 24OBDG07 this is the second fuel quantity control valve of the high-pressure system, the twin of the valve watched by P0090. While the driver is switched off, the ECM expects a defined voltage on the line; if it reads low, it treats the load as disconnected, which corresponds to more than 200 kilohms between the ECU pin and the valve. Battery voltage must exceed 10.9 V and the engine must turn faster than 80 rpm, and the fault has to persist for 20 seconds. GM rates it as a one-trip fault. A broken wire, a corroded plug at the pump or an open valve coil are the usual causes; the affected pump can no longer be regulated.

Likely causes

Broken wire or loose terminal in the valve circuit
Corroded or unplugged connector at the high-pressure pump
Open coil in the quantity control valve

Symptoms

  • Check engine light on
  • Power reduction because one pump is no longer controlled
  • Possible rail pressure fault codes alongside

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–900
Time0.5–3 h

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

Parts involved

fuel pressure regulator dhigh pressure fuel pumpwiring harness

Related codes

P2C03P2C04P2C01P0090

References: gsi.ext.gm.com, gsi.ext.gm.com, law.cornell.edu.