Fuel Level Sensor Circuit Low
The fuel level sensor is reporting a low signal.
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What it means (plain English)
The fuel level sensor in your tank is sending a low voltage signal, which indicates that the fuel level is low or there's an issue with the sensor or its wiring.
What the computer is actually seeing
The engine control unit (ECU) expects fuel level sensor readings to be between 0.5V (empty) to 4.5V (full). A consistent reading below 0.5V typically triggers this code.
What a healthy reading looks like
Fuel level should be 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.
- 11. Check the fuel level; ensure it's above the reserve level to eliminate a low fuel condition.
- 22. Inspect the wiring and connectors to the fuel level sensor for any visible damage or corrosion; repair as needed.
- 33. Measure the voltage at the sensor connector with the ignition on; it should read between 0.5V and 4.5V.
- 4 a. If voltage is low (below 0.5V), replace the fuel level sensor.
- 54. If voltage is within range, check ECU input for the sensor; use scan tool to see real-time data.
- 6 a. If ECU reads incorrectly, suspect a faulty ECU or poor communication.
Common causes
- Faulty fuel level sensor
- Damaged wiring or connectors
- Faulty ECU
- Low fuel condition
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but keep an eye on the fuel level since you may not be accurately informed about how much fuel is left.
Can this issue fix itself?
Unlikely. If the wiring or sensor is damaged, it will need to be repaired or replaced.
Why does this code sometimes pair with low power issues?
If the fuel level is inaccurately reported low, the fuel supply to the engine can be affected, causing reduced power.
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