Fuel Level Sensor Circuit High
The fuel level sensor signal is too high for normal operation.
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What it means (plain English)
The fuel level sensor is reporting that the fuel tank is fuller than it actually is, like if your car thinks it's got a tank full of gas but it's really empty.
What the computer is actually seeing
The engine control module (ECM) sees a voltage signal from the fuel level sensor that's consistently above the normal range, typically above 4.5 volts, indicating full or more than full fuel level.
What a healthy reading looks like
A properly functioning fuel level sensor should output a voltage between 0.5 volts (empty) and 4.5 volts (full); anything above 4.5 volts could trigger this code.
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 for the fuel level sensor for any visible damage or corrosion. If found, repair or replace as needed. Check connections for secure fit.
- 22. Measure the voltage at the fuel level sensor connector with the ignition on and the engine off. Expected reading should be between 0.5V and 4.5V. If it's above 4.5V, proceed to step 3; if normal, replace the sensor.
- 33. Disconnect the fuel level sensor and measure the resistance across the sensor terminals. If the resistance is not within 10-500 ohms, replace the sensor.
- 44. If all previous checks are normal, consider checking the ECM for faults or performing a reset to clear the code once repairs are completed.
Common causes
- Faulty fuel level sensor
- Short in wiring to the sensor
- Corrosion in connectors at the sensor or ECM
- Faulty ECM calculation or input error
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but be aware that the fuel gauge may be inaccurate, leading to potential runs out of fuel.
Will this problem come back after I fix it?
If the sensor or wiring issues are resolved, it shouldn't return, but monitor for any new issues.
Why does this code pair with SPN 654?
SPN 654 is related to the same fuel level sensor circuit, indicating a progression of the fault that may include sensor voltage issues.
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