What it means
Fuel pressure regulator C is not meeting its calibrated performance criteria. The code does not identify the cause of the fault.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
- The engine or gearbox may go into limp mode
How it works
Fuel pressure regulator C helps control fuel pressure in the fuel system. The control module assesses whether pressure responds as expected under its operating conditions; P2C00 means regulator C’s performance has fallen outside its calibrated criteria, without identifying the cause.
Common causes
Most likely first.
- Regulator aged
- Contamination affecting regulator seat
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
How to diagnose it
- Use freeze-frame data and live fuel-pressure readings to identify when pressure deviated and whether the engine was starting, idling, or under load.
- Check for related fuel-pressure or mixture codes and inspect accessible fuel lines and regulator C’s connector for leaks, damage, or contamination.
- Compare commanded and measured fuel pressure under the conditions in the freeze frame, following the manufacturer’s test procedure and specification.
- Check the regulator control circuit and fuel supply for faults that could prevent regulator C from controlling pressure correctly.
- If supply and control checks pass, assess regulator C for sticking or contamination at its seat using the manufacturer’s procedure.
Common fixes
- Repair any confirmed fuel-system connection or control-circuit fault affecting regulator C.
- Clean or correct contamination affecting regulator C’s seat if the manufacturer’s procedure allows it.
- Replace regulator C if pressure response remains outside specification after other causes are ruled out.
Can I keep driving?
Hard starting, stalling, or power loss under load can make driving unpredictable; avoid high-load driving and stop if the engine stalls or will not maintain power. A pressure fault can worsen and leave the vehicle unable to start.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.