P0231 – Fuel Pump Primary Circuit Low
Description
The ECM detects low voltage in the fuel pump primary circuit, reducing fuel pressure.
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Compare Diagnostic ScannersSymptoms
- Hard starting
- Engine stalls
- Poor acceleration
- No start
Causes
- Weak battery voltage
- Faulty fuel pump relay
- Damaged wiring
- Failing fuel pump
Diagnosis
- Check battery voltage
- Inspect wiring and connectors
- Test fuel pump relay
- Measure fuel pressure
Repair
- Replace relay
- Repair wiring
- Replace fuel pump