Fuel Level Sensor 1 Circuit Low
Indicates a low signal from the fuel level sensor.
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What it means (plain English)
The computer is seeing a lower-than-expected signal from the fuel level sensor, meaning it thinks the fuel level is much lower than it really is.
What the computer is actually seeing
The control module receives a voltage signal from the fuel level sensor. It expects to see a value between 0.5V (empty) and 4.5V (full). If the voltage drops below 0.5V, the fault code triggers.
What a healthy reading looks like
0.5V to 4.5V from the fuel level sensor signal; 0V indicates a problem.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the fuel level in the tank. If it’s low, fill it and clear the code. Test drive to see if it returns.
- 22. Inspect the wiring and connectors at the fuel level sensor for damage or corrosion. Repair as needed.
- 33. Measure the voltage at the fuel level sensor harness. It should be between 0.5V and 4.5V. If it’s below 0.5V, replace the fuel level sensor.
- 44. If the sensor is new and the wiring is intact, check the ECM for proper operation and possible software updates.
Common causes
- Faulty fuel level sensor
- Wiring issues or short circuit in the sensor circuit
- Corrosion in connector terminals
- Low fuel level affecting sensor readings
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive the vehicle if this code is present?
Yes, but the fuel gauge may be inaccurate, so fill up to avoid running out of fuel unexpectedly.
Will this code return after clearing?
It may return if the underlying issue, like a faulty sensor or wiring, isn't fixed.
Why do I see this code with low fuel codes?
It often pairs with low fuel signals because the sensor may fail to read correctly when fuel is low.
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