Powertrain, generic (extended)

P2C00 Fuel Pressure Regulator C Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2C00 reports that a third fuel pressure regulator, labelled C, cannot hold the pressure the engine module asks for, although its circuit tests fine. Letters beyond A and B are only needed on fuel systems with several pressure control elements, for example engines with two high-pressure pumps or separate control of low and high pressure. No manufacturer documents P2C00 publicly; regulator C's electrical faults have their own codes P233A to P233C. As a comparable performance check, GM's 2023 table 23OBDG07 watches the high-pressure controller output for its first and second quantity control valves (P0089, P2C01) and flags a fault when it stays beyond plus or minus 7.5 MPa for 10 seconds, on two trips. CARB requires fuel system and pressure control parts to be checked for proper function.

Likely causes

Regulator C or the pump it controls worn or sticking
Insufficient feed pressure to the controlled pump
Fuel pressure sensor drifting, so the regulator appears off target

Symptoms

  • Check engine light on
  • Reduced power at high load
  • Extended cranking

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 chigh pressure fuel pumpfuel rail

Related codes

P2C01P233AP2293P0089

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