Tank Fuel Level Sensor - Invalid Data
The fuel level sensor is providing data that the ECU considers invalid.
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What it means (plain English)
The fuel level sensor in the tank isn't sending usable information to the computer, which might show an incorrect fuel level on the gauge or may cause warning lights to activate.
What the computer is actually seeing
The ECM expects fuel level readings in a certain range (0-100% or 0-5 volts). If the readings are outside this range or inconsistent over time, it triggers this fault code.
What a healthy reading looks like
Fuel level sensor outputs should be between 5 to 10 volts for full, and 0 to 1 volt for empty. Any value outside this range is considered invalid by the ECU.
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. Inspect the wiring and connector for the fuel level sensor for any visible damage or corrosion. If damaged, repair or replace as needed. Decision: If wiring is good, proceed to step 2. If wiring is bad, fix it and recheck.
- 22. Check the fuel level sensor signal using a multimeter. You should see voltage changes between 0 to 5 volts as the tank is filled. Decision: If readings are within range, proceed to step 3. If not, replace the fuel level sensor.
- 33. Verify the ground connection for the fuel level sensor is solid. A weak or broken ground can cause erroneous readings. Decision: If ground is good, proceed to step 4. If ground is bad, fix it and recheck.
- 44. If both the sensor and wiring are fine, check the ECM for proper function and any other active fault codes. Decision: If no other faults, consider reprogramming the ECM or replacing it.
Common causes
- Faulty fuel level sensor
- Wiring issues between sensor and ECU
- Bad ground connection
- Tank float sticking or broken
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but you may run out of fuel unexpectedly due to incorrect gauge readings.
Will the code come back after fixing?
If all repairs are done correctly, it should not reappear.
Why might this code appear alongside others?
It often pairs with other fuel-related codes indicating a broader issue with the fuel system.
Working a real vehicle right now?
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