Tank Fuel Level Sensor Input - Invalid Signal

The computer is expecting a specific fuel level signal from the tank sensor, usually a voltage between 0.5V (empty) to 4.5V (full), but it's getting something out of that range or no signal.

Typically, the ECM (Engine Control Module) sees a voltage reading from the fuel level sensor. A normal reading is between 0.5V to 4.5V, corresponding to the fuel level. When it detects a voltage lower than 0.1V (which indicates a fault) or a flat line signal (no signal), it triggers this code.

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.

1. 11. Inspect the fuel level sensor wiring and connectors for damage or corrosion. - Decision: If damaged, repair or replace the wiring.
2. 22. Check the fuel level sensor output voltage using a multimeter. Connect the negative to ground and the positive to the signal wire - Decision Point: If voltage is not between 0.5V and 4.5V, go to step 3.
3. 33. Ensure the ground connection for the fuel level sensor is solid. Use a multimeter to test for continuity. - Decision Point: If no continuity, repair the ground.
4. 44. If all wiring is good and the sensor voltage is still out of range, replace the fuel level sensor. - Decision Point: Check if the code returns after replacing the sensor.

• Faulty fuel level sensor
• Damaged wiring or connectors to the sensor
• Faulty engine control module (ECM)
• Ground issues with the fuel level sensor wiring

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