Fuel Level Sensor Circuit Malfunction
The fuel level sensor is not providing a valid signal to the engine control module.
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What it means (plain English)
The fuel level sensor tells the computer how much fuel is in the tank. If it breaks, the computer can't know if you have enough fuel, which could lead to running out.
What the computer is actually seeing
The engine control module (ECM) expects a voltage signal from the fuel level sensor correlating to the fuel level. A range from 0.5 volts (empty) to 4.5 volts (full) is typical, but if it sees an open circuit or a voltage outside this range, it triggers a fault.
What a healthy reading looks like
0.5V to 4.5V from the fuel level sensor; 0 ohms (short) to infinite resistance (open circuit) when tested at the connector.
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 wiring and connector at the fuel level sensor for damage or corrosion. Repair or replace as necessary.
- 22. Test the fuel level sensor with a multimeter. Expect 0.5V (empty) to 4.5V (full) depending on fuel level. If out of range, replace the sensor.
- 33. Inspect the ECM connector for pin damage and ensure it's secure. Repair any issues found.
- 44. If both sensor and wiring check out, test the signal output at the ECM. If faulty, consider replacing the ECM.
Common causes
- Damaged fuel level sensor
- Wiring issues (broken or shorted wires)
- Bad connector or corroded terminals
- Faulty ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive my vehicle with this code active?
It's drivable, but keep an eye on the fuel level manually; the gauge might not work.
Will this code come back after I reset it?
If the issue isn't fixed, the code will likely return after running the vehicle.
Why does this code sometimes pair with SPN 433?
SPN 433 relates to excessive voltage; both often reflect failures in the fuel level sensor circuit.
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