Fuel Level Sensor Circuit Low
The fuel level sensor circuit is reporting a low signal.
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What it means (plain English)
Inside the fuel tank, there's a sensor that measures how much gas is in there. If it sends a signal that's too low, the computer thinks there's almost no fuel, even if there is.
What the computer is actually seeing
The Engine Control Module (ECM) sees a fuel level voltage drop below 0.5 volts when it should typically be around 0.5 to 4.5 volts depending on the amount of fuel in the tank.
What a healthy reading looks like
Expected fuel level sensor voltage is between 0.5V (empty) and 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 fuel level in the tank to ensure it is not empty. If fuel level is low, fill the tank and see if the code returns.
- 2Inspect the wiring harness and connectors at the fuel level sensor for damage, corrosion, or loose connections. Repair any issues found.
- 3Using a multimeter, measure the voltage at the fuel level sensor connector. If it is below 0.5 volts or not within expected range, replace the sensor.
- 4If the sensor voltage is normal, check the ECM for proper operation. This may require advanced diagnostics or scanning tools.
Common causes
- Faulty fuel level sensor
- Wiring issues in the sensor circuit
- Bad connector at the fuel level sensor
- Low fuel level in tank (but should trigger warnings)
Typical repair cost
$$ to $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It is generally safe to drive, but you may run out of fuel unexpectedly due to inaccurate readings.
Will the fault come back after clearing?
If the underlying issue isn't fixed, yes, the fault will likely return.
Why does this code sometimes pair with other SPNs?
Other SPNs can often indicate problems in the same circuit, like a short or malfunctioned components affecting fuel measurement.
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