Powertrain, generic (extended)

P2C01 Fuel Pressure Regulator D Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

GM uses P2C01 in its 2023 and 2024 summary tables 23OBDG07 and 24OBDG07 for an engine control module that drives two fuel quantity control valves on the high-pressure side: P0089 covers the first, P2C01 the second, labelled regulator D. The ECM compares the filtered output of the high-pressure controller with fixed bounds. If it stays above 7.5 MPa for 10 seconds, the pump cannot reach the target even at full demand; a shorter 6 second path applies when the tank is empty or on reserve. Below minus 7.5 MPa for 10 seconds means pressure stays too high despite maximum reduction. Both require two trips. Wiring faults of the same valve are separate codes, P2C02 to P2C04. Drivers usually notice a lack of power, hard starting or the MIL after the second trip.

Likely causes

Second high-pressure pump or its quantity control valve worn or sticking
Low tank level or weak low-pressure supply
Rail pressure sensor reading implausibly

Symptoms

  • Check engine light on after two trips
  • Reduced power or stumbling at full load
  • Hard or slow starting

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–1,500
Time1–5 h

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

Parts involved

fuel pressure regulator dhigh pressure fuel pumpfuel rail

Related codes

P2C02P2C00P0089P0087P0088

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