Non-Exhaust Emissions System, Incorrect Fuel Level Sensor Input
The fuel level sensor input is reading an unexpected value.
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What it means (plain English)
The computer is getting a fuel level reading that doesn’t match what it should be based on how much fuel is in the tank, which can confuse how the system monitors emissions.
What the computer is actually seeing
The computer expects the fuel level sensor to deliver a linear voltage signal, typically from 0.5V (empty) to 4.5V (full). If it gets a voltage outside of this range or a drop in voltage indicating an erroneous signal, it flags this code.
What a healthy reading looks like
Fuel level sensor output should range between 0.5V (empty) and 4.5V (full) with variations based on the fuel amount in the tank.
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. Inspect the wiring and connectors for the fuel level sensor for any signs of damage or loose connections. Repair as necessary.
- 22. Check the fuel level sensor output voltage using a multimeter while the ignition is on (engine off). It should read between 0.5V and 4.5V. If not, replace the sensor.
- 33. If the sensor outputs a proper voltage but the code persists, check the ECU for faults. Use a scan tool to see if there are any related codes or freeze frame data.
- 44. Ensure the correct fuel is being used. Some vehicles can be sensitive to fuel quality affecting sensor readings.
Common causes
- Faulty fuel level sensor
- Wiring issues between the sensor and the ECU
- Faulty ECU
- Incorrect fuel type or fuel quality issues
Typical repair cost
$$ - $$$ (sensor replacement, wiring repair, or ECU reprogramming)
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but it's advisable to fix it soon as it can affect fuel monitoring and emissions.
Will this code come back if I clear it?
It can come back, especially if the underlying issue isn't fixed.
Why is this code related to fuel quality?
Bad fuel can affect the readings from the fuel level sensor, causing incorrect outputs.
Working a real vehicle right now?
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