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.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Fuel pressure regulator c
- Fuel rail
- Fuel pump supply
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Open circuit in harness or connector
- Regulator solenoid winding open
- Pin pushed back out of connector body
Possible 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
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.