Fuel Level Sensor Circuit Fault
Indicates a malfunction in the fuel level sensor circuit.
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What it means (plain English)
The computer is not getting a correct reading from the fuel level sensor, which tells how much fuel is in the tank.
What the computer is actually seeing
The fuel level sensor is providing readings outside the expected range, often showing open circuit or short to ground.
What a healthy reading looks like
Typically, the fuel level should be between 0-100% full, and the sensor voltage should vary between 0.5-4.5 volts according to the level of fuel 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 at the fuel level sensor for damage or corrosion. Repair as needed. Decision: Are the connections clean and secure? If yes, go to step 2. If no, repair and retest.
- 22. Measure the voltage at the fuel level sensor while the vehicle is on. It should vary between 0.5V and 4.5V. Decision: Is the voltage within range? If yes, the sensor is likely faulty. If no, there may be a wiring issue to investigate further.
- 33. Check the resistance of the fuel level sensor. It should vary when you move the float. Decision: Is the resistance varying correctly? If yes, the issue is likely in the computer. If no, replace the sensor.
Common causes
- Faulty fuel level sensor
- Damaged wiring or connectors to the sensor
- Open or short circuit in the fuel level sensor circuit
- Fuel contamination affecting sensor readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but keep an eye on fuel levels as the gauge may not work.
Will this code come back after clearing it?
It may return if the underlying issue isn't fixed, especially if there's a wiring issue or a faulty sensor.
Why does this code sometimes pair with SPN 5100?
SPN 5100 can indicate a related issue with the fuel gauge performance, often occurring with fuel level sensor faults.
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