P0233: Reports an intermittent condition in the fuel-pump secondary circuit.
Meaning, symptoms, causes and checks
Reports an intermittent condition in the fuel-pump secondary circuit. The definition concerns that circuit and does not specify a continuously low fuel pressure.
Affected system: Powertrain
Symptoms
- Check Engine light
- Hard starting or engine stalling
- Hesitation, weak acceleration, or rough idle
- Abnormal fuel consumption
Possible causes
- Open, shorted, corroded, or loose fuel-system wiring
- Faulty pressure sensor, regulator, pump, relay, or injector
- Restricted fuel supply or incorrect pressure
- Control-module driver or calibration problem
What to check
- Record all codes and freeze-frame conditions
- Check for fuel leaks and follow fuel-system safety procedures
- Inspect the relevant electrical circuit and verify supply voltage and ground
- Compare commanded pressure or injector operation with actual behavior
- Confirm the repair under the conditions that originally set the code
- Inspect fuel-system fuses, connectors, wiring, and grounds
- Compare commanded and measured fuel pressure where supported
- Test the affected pump, regulator, sensor, or injector circuit
Also written as: P0233-00, P023300, PO233 (some scan tools add the fault-type byte, e.g. -00).