Fuel Level Sensor Input - Invalid Value
The fuel level sensor is reporting an incorrect value to the ECM.
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What it means (plain English)
The fuel level sensor, which measures how much fuel is in the tank, is sending wrong information to the engine control module (ECM), making it think there's more or less fuel than there actually is.
What the computer is actually seeing
The ECM expects a fuel level signal within a range (typically 0.5V to 4.5V), but it detects out-of-range values, indicating a problem with the sensor or its wiring.
What a healthy reading looks like
Fuel level should be between 0 to 100% as a voltage signal of 0.5V (empty) to 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 fuel level sensor wiring for damage or corrosion. Check for voltage at the sensor connector while the key is on; expect between 0.5V and 4.5V. If voltage is missing, go to step 2.
- 22. Test the fuel level sensor by measuring resistance; should change as the fuel level varies. If using a multimeter, normal range is typically 5-10 ohms at empty to 150-200 ohms at full. If it’s out of spec, replace the sensor and retest.
- 33. If the sensor checks out, connect a scanner and observe the fuel level reading while manipulating the float (vary fuel level). If the reading doesn't change, inspect ECM connections. If no faults found, consider replacing the ECM.
Common causes
- Faulty fuel level sensor
- Damaged wiring or connectors
- Corrosion in connectors
- Faulty ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
While you can drive, be aware of potential fuel gauge inaccuracies which can lead to running out of fuel unexpectedly.
Will this code come back after resetting it?
If the underlying issue with the sensor or wiring isn't fixed, the code will likely return.
Why does it pair with codes like SPN 1727?
SPN 1727 is often related as it indicates high or low fuel level, which can originate from the same faulty sensor.
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