Faulty Sensor - FUEL TANK LEVEL
The fuel tank level sensor is reporting an invalid signal.
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What it means (plain English)
The computer is getting weird data from the fuel tank level sensor, which tells it how much fuel is in the tank.
What the computer is actually seeing
The ECM expects a voltage signal from the fuel tank level sensor that ranges from 0.5 volts (empty) to 4.5 volts (full), depending on the actual fuel level. If it sees a voltage outside this range, such as 0 volts or 5 volts, it throws this code.
What a healthy reading looks like
Look for a fuel tank level sensor voltage that should be between 0.5V (empty) and 4.5V (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. Inspect the wiring and connectors from the fuel tank level sensor for damage, corrosion, or loose connections.
- 22. Check the fuel level sensor voltage reading using a multimeter. It should be within 0.5V to 4.5V when the ignition is on and the engine is off.
- 33. If voltage is outside the expected range, replace the fuel level sensor and retest.
- 44. If the sensor is good, check continuity in the wiring harness back to the ECM.
- 55. Verify ECM calibration is correct; update or reflash if necessary.
Common causes
- Open or shorted wiring in the fuel level sender circuit
- Faulty fuel level sensor
- Corroded or damaged connectors
- Software calibration issue in the Engine Control Module (ECM)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but you won't know your fuel level accurately, so fill up regularly.
Will this code come back after clearing it?
If the issue is unresolved, yes, it will likely return.
Why might this code show up alongside other SPN codes?
Multiple related faults can affect sensor readings, indicating system-wide issues.
Working a real vehicle right now?
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