Fuel Level Sensor 1 Out of Range
The fuel level sensor is reporting an invalid fuel level reading.
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What it means (plain English)
The fuel level sensor tells the computer how much fuel is in the tank, but it's giving a reading that's outside of the normal range, like showing empty when it's actually half full or reporting no fuel at all.
What the computer is actually seeing
The ECM expects fuel level feedback voltages between 0.5V (empty) and 4.5V (full). When it reads below 0.5V or above 4.5V, it triggers SPN 1718.
What a healthy reading looks like
Valid fuel level sensor voltage should be between 0.5V and 4.5V, corresponding to 0% to 100% fuel 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 fuel level sensor wiring for any signs of damage or corrosion. Repair any issues found. Decision: Is wiring good? (Yes/No)
- 22. Measure the voltage at the fuel level sensor connector with the ignition on (engine off). Expect 0.5V to 4.5V for proper function. Decision: Is voltage in range? (Yes/No)
- 33. If voltage is out of range, disconnect the sensor and check the resistance of the sensor. It should change according to fuel level readings. Decision: Is sensor resistance in expected range? (Yes/No)
- 44. If both voltage and resistance are out of range, consider replacing the fuel level sensor. If the wiring is good but the ECM readings remain off, perform a reset and check for available updates or replacements for the ECM.
Common causes
- Faulty fuel level sensor
- Wiring issues or shorts
- Corroded connectors
- ECM malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix this soon as it affects fuel gauge accuracy but typically it's safe to drive if you monitor fuel levels manually.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, it will likely reappear.
Why does this code pair with SPN 1717?
SPN 1717 indicates a similar issue with the fuel level sensor but typically shows a different fault condition, often related to wiring or output.
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