Fuel Level Sensor Circuit Low Input
The fuel level sensor is sending a lower than expected voltage signal.
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What it means (plain English)
The computer thinks the fuel tank is nearly empty because the sensor is not measuring the fuel level correctly due to a low voltage signal.
What the computer is actually seeing
The fuel level sensor typically outputs a voltage between 0.5V (empty) to 4.5V (full). In this case, the voltage is less than the expected threshold, usually below 0.5V.
What a healthy reading looks like
Fuel level sensor should output between 0.5V and 4.5V depending on the tank level.
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. Is it low? If yes, add fuel and recheck code. If the code returns, proceed to step 2.
- 22. Inspect the wiring and connectors at the fuel level sensor. Look for corrosion, frayed wires, or loose connections. Repair any found issues and retest.
- 33. Measure the voltage at the fuel level sensor connector with the key on (engine off). Is it between 0.5V and 4.5V? If yes, the sensor might be faulty. If no, proceed to step 4.
- 44. Check the ground circuit for the sensor. Is it good? If no, fix the ground issue. If yes, replace the fuel level sensor.
Common causes
- Faulty fuel level sensor
- Wiring issues (short to ground or open circuit)
- Corroded connectors
- Low fuel level causing improper reading
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but fuel gauge may not work properly, and you risk running out of fuel unexpectedly.
Will this code come back?
If the underlying issue isn't fixed, the code is likely to return.
Why does this code pair with other fuel codes?
Fuel system codes often point to related issues, such as incorrect readings or sensor failures.
Working a real vehicle right now?
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