P1240 – Fuel Level Sensor Circuit
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Symptoms
- Incorrect fuel gauge reading
- Gauge stuck
- Low fuel warning issues
- Check engine light
- Range estimate incorrect
Causes
- Faulty level sensor
- Wiring issue
- Connector corrosion
- Worn resistor track
- ECU input fault
Diagnosis
- Check sensor resistance
- Inspect wiring
- Check connector condition
- Compare gauge to actual level
- Scan live data
Repair
- Replace fuel level sensor
- Repair wiring
- Clean connectors
- Replace pump module if integrated
- Update ECU if needed