P2C01Fuel Pressure Regulator D Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine light on after two trips
- Reduced power or stumbling at full load
- Hard or slow starting
- Likely causes
- PossibleSecond high-pressure pump or its quantity control valve worn or sticking
- PossibleLow tank level or weak low-pressure supply
- RareRail pressure sensor reading implausibly
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.