Fuel Level Sensor Circuit High
The fuel level sensor is reporting a high voltage signal.
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What it means (plain English)
The fuel level sensor is like a float in a tank that tells the computer how much fuel is there. If it sees a voltage that's too high, it thinks there's a problem with the sensor or wiring instead of the actual fuel level.
What the computer is actually seeing
The computer sees a voltage reading from the fuel level sensor that exceeds 4.5 volts, indicating a fault in the sensor circuit.
What a healthy reading looks like
The normal voltage from a functional fuel level sensor should be between 0.5 to 4.5 volts depending on the fuel 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.
- 1Check the fuel level sensor connector. Look for frayed wires or corrosion.
- 2Measure the voltage at the connector with the key on and the engine off. Expect between 0.5 to 4.5 volts. If it's over 4.5V, go to step 3.
- 3Inspect the wiring harness from the fuel level sensor to the ECM for shorts or damage. Look for pinched wires or areas rubbing against metal.
- 4If wiring is good, replace the fuel level sensor. Recheck connector and wiring after replacement.
Common causes
- Faulty fuel level sensor
- Damaged wiring or connectors
- Short circuits in the sensor circuit
- Corrosion in the connector plugs
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It may be drivable, but fuel level reading could be inaccurate.
Will this problem come back after fixing?
If all damaged parts are replaced and connections restored, it shouldn't return.
Why is this paired with SPN 4091?
SPN 4091 indicates a low voltage condition on the same sensor circuit.
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