Fuel Level Sensor Malfunction
Fuel level sensor is out of range or not working correctly.
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What it means (plain English)
The fuel level sensor inside the tank measures how much fuel is left and sends this info to the engine control unit. If it's not reading right, the gauge can show inaccurate fuel levels.
What the computer is actually seeing
The engine control unit (ECU) sees voltage readings from the fuel level sensor that are outside the expected range (0.5V to 4.5V for typical sensors).
What a healthy reading looks like
Expected voltage output from fuel level sensor: 0.5V (empty) to 4.5V (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.
- 1Check the wiring and connectors at the fuel level sensor for damage or corrosion. Repair as necessary.
- 2Measure the voltage at the fuel level sensor connector with the key on and engine off. Expected values: 0.5V to 4.5V. If out of range, proceed to step 3.
- 3Test the resistance of the fuel level sensor while moving the float (if accessible). Resistance should change smoothly between specified limits. If not, replace the sensor.
- 4Inspect the fuel gauge cluster for proper function; if other gauges are malfunctioning, consider replacing the cluster or checking the ECU.
Common causes
- Faulty fuel level sensor
- Wiring issues or connector problems
- Fuel gauge cluster malfunction
- ECU software issues
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive with this code?
Yes, but be aware your fuel gauge may not work correctly, leading to potential run-outs.
Will this code come back after I clear it?
If the underlying issue isn't resolved, yes, it will likely return.
Why does this code also pair with SPN 1705?
SPN 1705 often indicates a fault in the fuel gauge system, which is related to the fuel level sensor.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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