Fuel Level Sensor Circuit Low Input
Fuel level sensor is reading too low a voltage.
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What it means (plain English)
The fuel level sensor is supposed to send a signal to the engine control module (ECM) to show how much fuel is in the tank. If it's reading low voltage, the ECM thinks there's little to no fuel, even if there is.
What the computer is actually seeing
The engine control module expects a voltage between 0.5V and 5V from the fuel level sensor corresponding to the fuel level. A reading below 0.5V indicates low input.
What a healthy reading looks like
0.5V to 5V depending on fuel level, with 0.5V being empty and 5V being 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 there is fuel in the tank. Decision: If empty, fill and retest. If not, proceed.
- 22. Inspect the wiring and connector at the fuel level sensor for damage or corrosion. Decision: If damaged, repair or replace. If not, proceed.
- 33. Using a multimeter, measure the voltage at the fuel level sensor connector with the key on. You should see between 0.5V and 5V. Decision: If low voltage, sensor likely faulty. If normal voltage, proceed.
- 44. Test the fuel level sensor by removing it and manually measuring its resistance at different fuel levels. Decision: Replace if readings are outside of specifications. If readings are correct, ECM may be at fault.
Common causes
- Faulty fuel level sensor
- Wiring issue in the fuel level sensor circuit
- Corroded connector
- Low fuel level or fuel pump failure
- ECM issue.
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but expect potential misreading of fuel level, which may leave you stranded.
Will the code come back after I fix it?
If the issue is addressed properly, the code should clear and not return.
Why does this code sometimes pair with other codes?
Multiple sensor failures or wiring issues can trigger more than one code.
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