OBD-II code · Powertrain (generic, extended)
P233C Fuel Pressure Regulator C Control Circuit High
Same as P233A but with the control line shorted to supply - the ECU measures a high voltage that does not match the commanded duty cycle.
Is it safe to drive with P233C?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl line shorted to battery or supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–2 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Pressure Regulator C, Fuel Rail
Related codes
- P0092Fuel Pressure Regulator A Control Circuit High
- P2C04Fuel Pressure Regulator D Control Circuit High
- P2339Cylinder 4 Above Knock Threshold
- P233AFuel Pressure Regulator C Control Circuit Open
- P233BFuel Pressure Regulator C Control Circuit Low
- P233DFuel Pressure Regulator B Solenoid Supply Voltage Control Circuit Open
- P233EFuel Pressure Regulator B Solenoid Supply Voltage Control Circuit Low
- P233FFuel Pressure Regulator B Solenoid Supply Voltage Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.