Fuel Level Sensor Over-Voltage
The fuel level sensor is reporting a voltage higher than normal.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The fuel level sensor is sending more voltage than it should, which makes the computer think the fuel level is higher than it really is. It might be sending over 5 volts instead of the normal range.
What the computer is actually seeing
The engine control module (ECM) expects a fuel level signal between 0.5V (empty) and 3.5V (full). When it sees values above 3.5V, it triggers the code.
What a healthy reading looks like
0.5V to 3.5V for correct fuel level. Values above 3.5V indicate an issue.
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.
- 1Check the fuel level sensor connector for corrosion or damage. Repair if necessary.
- 2Measure the voltage at the fuel level sensor connector. Expected range is 0.5V to 3.5V.
- 3If voltage is above 3.5V, inspect the wiring between the sensor and the ECM for short circuits.
- 4Test the fuel level sensor by replacing it with a known good unit if the wiring is fine and the voltage is still high.
Common causes
- Damaged fuel level sensor
- Shorted wiring or connector issues
- Faulty ECM
- Incorrect fuel level reading due to tank design
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it’s drivable but the fuel level may not be accurate, so fill up regularly.
Will this code come back after clearing?
It might if the underlying issue isn't fixed — monitor fuel levels and wiring.
Why does this code pair with SPN 4757?
SPN 4757 also relates to fuel level sensor issues, often showing similar symptoms.
Working a real vehicle right now?
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