Fuel Level Sensor Circuit
Fuel level sensor is reporting an issue.
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What it means (plain English)
The fuel level sensor isn't working right, so the computer can't tell how much fuel is in the tank.
What the computer is actually seeing
The engine control module (ECM) expects to see a voltage signal from the fuel level sensor that varies proportionally with the amount of fuel in the tank, typically 0.5 to 4.5 volts for full range. If it detects a constant voltage outside this range, it triggers the code.
What a healthy reading looks like
Expected sensor voltage range is typically between 0.5 volts (empty) to 4.5 volts (full).
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 fuel level in the tank. Ensure it's not too low to affect readings.
- 22. Inspect wiring and connectors for visible damage or corrosion—specifically the sensor connector.
- 33. Measure the voltage at the fuel level sensor connector with the key on (engine off). Expected should be between 0.5-4.5 volts.
- 44. If voltage is out of range, check the continuity of the wires back to the ECM. Repair any issues found.
- 55. If all wiring is good and voltage is still incorrect, replace the fuel level sensor and recheck system operation.
Common causes
- Faulty fuel level sensor
- Wiring issues or short circuits
- Bad ground connection
- ECM failure
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but keep an eye on fuel levels manually, as the gauge may not work.
Will this code come back after clearing it?
If the underlying issue isn't fixed, it will likely return after the vehicle is run again.
Why does this code often pair with other codes?
Issues with fuel level can affect other systems like fuel delivery, triggering related codes.
Working a real vehicle right now?
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