P0234 — Fuel Pump Secondary Circuit Intermittent
Drivable short-term, but fix now to avoid damage.
What P0234 means
This code means the engine computer detected an intermittent, on-and-off fault in the secondary circuit that powers the fuel pump. Because the problem comes and goes, it often points to a loose connector, chafed wiring, or a relay that only acts up under certain conditions like heat or vibration. Common fixes include cleaning or repairing connectors, fixing damaged wiring, or replacing the fuel pump relay or driver module.
Common symptoms
- Check engine light is on or flickers on and off
- Intermittent stalling or hesitation
- Occasional hard starting or no-start
- Random loss of power while driving
- Symptoms that come and go with heat or bumps
Common causes
- Loose or corroded electrical connectors
- Chafed or intermittently shorting wiring
- Failing fuel pump relay that acts up with heat
- Intermittent fault in the fuel pump driver module
- Loose ground connection
Typical repair cost
$120 – $700
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0234 code?
You can often drive, but intermittent fuel pump faults are unpredictable and can cause sudden stalling or a no-start. It's best to get it diagnosed soon so a loose connection doesn't leave you stranded.
How much does it cost to fix a P0234 code?
Repairs usually range from about $120 to $700. Cleaning or repairing connectors is inexpensive, while replacing a relay, driver module, or fuel pump costs more.
Is a P0234 code serious?
It can be. Even though the car may run fine most of the time, an intermittent fuel pump circuit fault can cause stalling or a no-start without warning, so it deserves prompt attention.
Why are intermittent codes like P0234 hard to fix?
Because the fault comes and goes, it may not be present when the mechanic tests the car. Technicians often have to wiggle-test wiring and connectors or monitor the circuit over time to catch the problem.