OBD-II code · Powertrain (generic, extended)
P233B Fuel Pressure Regulator C Control Circuit Low
Same as P233A but with the control line shorted to ground - the ECU measures a low voltage that does not match the commanded duty cycle.
Is it safe to drive with P233B?
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 ground
- PossibleRegulator solenoid shorted internally
- Less likelyConnector pins corroded - high contact resistance
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
- P0091Fuel Pressure Regulator A Control Circuit Low
- P2C03Fuel Pressure Regulator D Control Circuit Low
- P2338Cylinder 3 Above Knock Threshold
- P2339Cylinder 4 Above Knock Threshold
- P233AFuel Pressure Regulator C Control Circuit Open
- P233CFuel Pressure Regulator C Control Circuit High
- P233DFuel Pressure Regulator B Solenoid Supply Voltage Control Circuit Open
- P233EFuel Pressure Regulator B Solenoid Supply Voltage Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.