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.
Affected components
- Fuel pressure regulator c
- Fuel rail
- Fuel pump supply
Common causes
- High likelihood: Open circuit in harness or connector
- Medium likelihood: Regulator solenoid winding open
- Low likelihood: 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
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.