Tank Level Sensor Unavailable
The system can't read the fuel tank level sensor input.
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What it means (plain English)
The truck's computer is not getting a signal from the fuel tank level sensor, which tells how full the tank is.
What the computer is actually seeing
The ECM expects a voltage between 0.5V (empty) and 4.5V (full) from the level sensor as a signal to determine the fuel level.
What a healthy reading looks like
0.5V to 4.5V from tank level sensor under normal operation conditions.
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 tank level. Is it very low? If yes, fill the tank and retest. If the code returns, go to step 2.
- 22. Inspect the wiring and connectors at the tank level sensor. Are there any signs of damage or corrosion? If yes, repair as necessary and retest. If no, go to step 3.
- 33. Measure the voltage at the tank level sensor connector with the key on (engine off). Is the voltage between 0.5V and 4.5V? If yes, suspect the ECM might be faulty. If no, check the sensor and wiring for issues. Replace as required.
Common causes
- Damaged wiring or connectors on the tank level sensor harness
- Faulty fuel tank level sensor
- ECM software issue
- Low fuel level affecting sensor reading
Typical repair cost
$$ (100 - 500)
Related codes
Frequently asked questions
Is it safe to drive with this fault code?
Yes, but you'll want to fill the tank by approximately 1/4 full so you can monitor the gauge and avoid running out of fuel.
Will this code return after I fix it?
If the underlying issue is resolved, the code should not return; however, if the ECM is the issue, further diagnosis may be needed.
Why does this code come with other SPNs?
This code is commonly paired with other tank level codes due to the interconnected nature of fuel level sensing and tank monitoring systems.
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