OBD-II code · Powertrain (generic, extended)
P233A Fuel Pressure Regulator C Control Circuit Open
The ECU detects an open circuit on the control line for the third (C) fuel pressure regulator. Either the regulator solenoid coil is internally open, the harness is broken, or the connector has lost contact - the ECU cannot drive the regulator and rail pressure cannot be controlled by this stage.
Is it safe to drive with P233A?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen circuit in harness or connector
- PossibleRegulator solenoid winding open
- Less likelyPin pushed back out of connector body
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, Fuel Pump Supply
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.