Invalid Data - Fuel Level Sensor
Fuel level sensor is providing invalid data to the ECM.
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What it means (plain English)
The fuel level sensor is supposed to send a percentage of how much fuel is in the tank, usually between 0-100%. If it’s reading incorrectly, the computer thinks it has more or less fuel than it actually does, which can lead to incorrect readings on your dash.
What the computer is actually seeing
The Engine Control Module (ECM) expects a fuel level input signal that correlates with fuel levels. A typical signal range is 0.5V to 4.5V, with 0.5V indicating an empty tank and 4.5V indicating a full tank. If it sees values outside this range or inconsistent fluctuations, it will trigger the code.
What a healthy reading looks like
Fuel level sensor output should be within the voltage range of 0.5V (empty) to 4.5V (full) when the key is on and should vary proportionately during operation.
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 sensor for visible damage or corrosion. If damaged, replace the sensor.
- 22. Inspect wiring and connectors leading to the fuel level sensor for any frays, breaks, or corrosion. Repair or replace as necessary.
- 33. Verify fuel level readings with a multimeter while manually moving the float or when the tank is filled. If readings are inconsistent or out of expected range, replace the fuel level sensor.
- 44. If all components test okay, check for ECM updates or software issues according to manufacturer guidelines.
Common causes
- Faulty fuel level sensor
- Wiring issues (shorts or breaks)
- ECM software issues
- Corroded or loose connectors
- Mechanical obstruction in the fuel tank
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it's typically safe to drive, but you may experience incorrect fuel level readings.
Will this code come back after clearing?
If the issue isn’t resolved, the code will likely reappear.
Why does this code sometimes pair with other SPN codes?
Multiple sensor failures or wiring issues can trigger several related codes at once, such as those for other sensors in the fuel system.
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