Fuel Level Sensor Voltage Out of Range
The fuel level sensor is reading a voltage that is out of its expected range.
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What it means (plain English)
The fuel level sensor measures how much fuel is in the tank by sending a voltage signal to the computer. If this signal is too high or too low, like over 4.5 volts or under 0.5 volts, the computer thinks there's a problem with the sensor or the wiring.
What the computer is actually seeing
The Engine Control Module (ECM) looks for a voltage between 0.5V and 4.5V from the fuel level sensor. Any value outside this range triggers the fault code.
What a healthy reading looks like
Normal fuel level sensor voltage 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. Check the fuel level sensor connector for corrosion and make sure it is securely attached. Decision: If damaged, repair as needed.
- 22. Use a multimeter to test the voltage at the fuel level sensor connector. Key points: Should read 0.5V to 4.5V. Decision: If voltage is out of range, continue troubleshooting; if in range, suspect ECM.
- 33. Inspect the wiring between the sensor and the ECM for any visible damage or shorts. Decision: Repair or replace damaged wiring as necessary.
- 44. If wiring and connectors check out, replace the fuel level sensor. Decision: If problem persists after replacement, consider a faulty ECM.
Common causes
- Faulty fuel level sensor
- Damaged wiring or poor connections
- Corrosion at the connector
- Faulty ECM
- Incorrect fuel depth or a floating issue in the tank
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but fuel gauge might be inaccurate, so keep track of fuel manually.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will likely return.
Why do I see this code with SPN 370?
SPN 370 refers to a similar fuel sensor issue; they can trigger together.
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