Tank Fuel Level Sensor Fault
Indicates a problem with the fuel level sensor in the tank.
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What it means (plain English)
The vehicle's computer is not getting accurate readings from the fuel level sensor in the tank, which can cause incorrect fuel level displays and may affect fuel management.
What the computer is actually seeing
The engine control unit (ECU) expects a fuel level signal between 0.5V (empty) and 4.5V (full) from the sensor as it operates between 0-100% tank capacity.
What a healthy reading looks like
0.5V (0% full) to 4.5V (100% full), readings dependent on actual tank level.
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 fluid level in the fuel tank; ensure it's not low, as this can cause sensor issues.
- 22. Inspect wiring and connectors from the fuel level sensor to the ECU for damage or corrosion; repair any issues found.
- 33. Measure the voltage at the fuel level sensor connector with the ignition on and the engine off. Expected voltage should be between 0.5V and 4.5V. If not, replace the sensor.
- 44. If the sensor measures correctly, use a scan tool to check ECU for other fault codes indicating a possible internal ECU failure.
Common causes
- Faulty fuel level sensor
- Damaged wiring or connectors
- Faulty engine control unit (ECU)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code set?
Yes, but monitor fuel levels manually until repaired, as inaccurate fuel readings may cause issues.
Will this problem come back after repair?
If the faulty component is replaced and wiring is intact, it shouldn't return unless there’s another underlying issue.
Why does this code sometimes pair with others?
Other related codes can indicate a broader issue with the fuel system or ECU, so check all codes for a comprehensive diagnosis.
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