Fuel Level Sensor Circuit Low Voltage
Indicates a low voltage reading from the fuel level sensor.
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What it means (plain English)
The fuel level sensor measures how much fuel is in the tank, and this code means it's sending back a signal that's too low, indicating a problem with the sensor or its wiring.
What the computer is actually seeing
The Vehicle Control Module (VCM) expects a voltage reading from the fuel level sensor between 0.5 volts (empty) to 4.5 volts (full). A reading below 0.5 volts suggests a fault in the circuit.
What a healthy reading looks like
Fuel level sensor output should be between 0.5V (empty) and 4.5V (full) when the ignition is on.
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 fuel level sensor wiring and connectors for damage or corrosion. Disconnect and clean connections if necessary.
- 22. Measure the voltage at the fuel level sensor connector with the ignition on. Expected voltage is between 0.5V and 4.5V.
- 33. If voltage is below 0.5V, check for shorts to ground or continuity issues in the wiring.
- 44. If wiring checks out, replace the fuel level sensor. If the issue persists, consider ECM/VCM fault.
Common causes
- Faulty fuel level sensor
- Wiring issues (shorts, opens)
- Corrosion or poor connections at the sensor or connector
- Faulty ECM/VCM
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it’s drivable but fix it soon to avoid running out of fuel unexpectedly.
Will this code come back after clearing?
If the underlying issue isn't fixed, it will likely return.
Why does this code pair with SPN 3750?
Both codes relate to fuel level sensor functionality, indicating possible issues in the sensor circuit.
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