P0233 — Fuel Pump Secondary Circuit Intermittent
High severityWhat it means
P0233 is stored when the engine control unit sees a fault involving the fuel pump control circuit. The fuel pump delivers fuel from the tank to the engine at the required pressure; a control-circuit fault can starve the engine of fuel. An “intermittent” fault appears and clears on its own, which almost always means a connection problem rather than a dead part.
Common symptoms
- A warning light that comes and goes
- Hard starting or a no-start
- Stalling or power loss under load
- Sputtering at higher speed
Likely causes
- Loose, backed-out or corroded connector pins
- Chafed wiring that shorts with movement or vibration
- A worn fuel pump or pump relay/driver module
- A wiring, connector or ground fault
What to check first
- Wiggle-test the connector and harness while watching the live signal
- Check fuel pressure and listen for the pump priming at key-on
- Inspect the pump relay, fuse and wiring
Can you keep driving?
A failing fuel pump can leave you stranded without warning — treat it as urgent.
Frequently asked questions
What is the most common cause of P0233?
The most likely cause is: Loose, backed-out or corroded connector pins. Several other faults can set P0233 as well, so confirm the real cause with live data and the checks above before replacing any parts.
Can I just clear P0233 and keep driving?
Clearing P0233 with an OBD2 scanner turns the warning light off, but if the underlying fault has not been repaired the code will usually come back within a few drive cycles. Fix the cause first, then clear the code to confirm the repair worked.
How serious is P0233?
P0233 is a high-severity code. Diagnose and repair it as soon as possible, because continuing to drive can cause further damage or leave you stranded.
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