P1243 – Fuel Level Sensor Low Input
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Symptoms
- Gauge stuck on empty
- Premature low fuel warning
- Incorrect range estimate
- Check engine light
- Possible no start from empty tank
Causes
- Short to ground
- Open circuit
- Faulty sensor
- Connector issue
- ECU input fault
Diagnosis
- Measure sensor voltage
- Check continuity
- Inspect wiring
- Inspect connector
- Compare to actual fuel level
Repair
- Repair wiring
- Replace fuel level sensor
- Clean connectors
- Correct open circuits
- Update ECU if needed