Fuel Level Sensor Circuit Low
The fuel level sensor circuit is reporting a low voltage condition.
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What it means (plain English)
The fuel level sensor is not detecting the right amount of fuel in the tank, which means the gauge might show empty even when there's fuel.
What the computer is actually seeing
The engine control module sees a voltage lower than the expected range from the fuel level sensor, typically below 0.5 volts when it should be around 5 volts.
What a healthy reading looks like
Fuel level sensor should read between 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.
- 11. Check the fuel level in the tank. Ensure it’s not actually empty.
- 22. Inspect the wiring and connector for the fuel level sensor for damage, corrosion, or loose connections; repair as necessary.
- 33. With the ignition on, use a multimeter to measure the voltage at the fuel level sensor connector. Expected: 0.5V-4.5V.
- 44. If voltage is out of range, confirm ground integrity by checking voltage between the ground pin and battery negative; should be 0V.
- 55. If the sensor appears faulty or readings are outside expected values, replace the fuel level sensor and clear codes.
- 66. After replacement, ensure the system resets and does not throw the code again. Check for consistent fuel level readings.
Common causes
- Faulty fuel level sensor
- Damaged wiring between the sensor and ECM
- Poor ground connection
- ECM malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but you might not know how much fuel you have left, so fill up often.
Will this code come back after I fix it?
If you correctly identify and fix the underlying issue, it shouldn't come back.
Why does this code pair with SPN 1726 or SPN 1718?
Those codes also deal with fuel system readings, often indicating related sensor or wiring issues.
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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