P0233Fuel Pump Secondary Circuit Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- The fuel pump circuit has two sides: the primary circuit is the engine module's output to the fuel pump relay coil (or to a pump control module), the secondary circuit is the power circuit from relay contact or module to the pump itself. P0233 reports brief, recurring dropouts in the pump power circuit that count neither as steadily low nor high. The secondary circuit is the power side of the same pump, not a second pump. No manufacturer using this code was found – GM counts intermittent faults within P0231/P0232/P023F, Ford's relay systems only use P0230–P0232; the description follows CARB's output monitoring requirement and Ford's description of the power circuit. Symptoms are occasional stumbling, stalling or starting problems.
- What you may notice
- Occasional stumbling or jerking
- Engine stalls now and then
- Occasional starting problems
- Check engine light on
- Likely causes
- LikelyLoose contact at pump connector, tank flange or relay socket
- PossibleRelay contacts burnt (intermittently high resistance)
- PossibleHarness chafing at underbody or tank with intermittent contact
- RarePump motor with commutator or brush dropouts
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.