Fuel Level Sensor Circuit High
The engine control module (ECM) has detected a problem with the fuel level sensor circuit, indicating a high voltage condition.
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What it means (plain English)
The fuel level sensor is sending a signal to the engine computer that the fuel tank is fuller than it actually is, which could mean the sensor or wiring has a fault.
What the computer is actually seeing
The ECM expects the fuel level sensor to output a voltage between 0.5V to 4.5V; if it sees a voltage above this range, it triggers the fault code.
What a healthy reading looks like
Expected voltage from fuel level sensor: 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 wiring and connectors for the fuel level sensor for frays, corrosion, or loose connections. If any issues found, repair them and retest.
- 22. Measure the voltage at the fuel level sensor connector with the ignition on but the engine off. Expected voltage should be within 0.5V to 4.5V. If voltage is over 4.5V, suspect a faulty sensor.
- 33. If the voltage is within spec, disconnect the fuel level sensor and check the resistance of the sensor; it should change from near 0 ohms (empty) to around 60 ohms (full). If out of spec, replace the sensor.
Common causes
- Faulty fuel level sensor
- Shorted wiring in sensor circuit
- Poor connection at the fuel level sensor connector
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the vehicle if this code is present?
Yes, it is drivable but you may inaccurately judge fuel levels.
Will this code come back after clearing?
It can if the underlying issue is not resolved.
Why does this code sometimes pair with SPN 3890?
SPN 3890 indicates an invalid fuel level data, often caused by the same sensor or circuit issues.
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