Fuel Level Sensor Circuit Low
The fuel level sensor circuit voltage is lower than expected.
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What it means (plain English)
The fuel level sensor is telling the computer there's less fuel in the tank than there actually is, likely due to a faulty sensor or wiring issue.
What the computer is actually seeing
The Engine Control Unit (ECU) expects a voltage signal between 0.5V to 4.5V corresponding to the fuel level. A lower voltage than 0.5V indicates an issue.
What a healthy reading looks like
Normal sensor output 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.
- 1Check the fuel level in the tank; ensure it's not too low. Decision Point: Is fuel level adequate? (Yes: proceed to next step, No: fill tank)
- 2Inspect wiring and connectors leading to the fuel level sensor for damage, corrosion, or loose connections. Decision Point: Are wiring and connectors in good condition? (Yes: proceed to next step, No: repair/replacement needed)
- 3Using a multimeter, measure the voltage at the fuel level sensor. Expect a voltage between 0.5V and 4.5V. Decision Point: Is the voltage within range? (Yes: replace sensor, No: trace wiring back to the ECU for further testing)
Common causes
- Faulty fuel level sensor
- Wiring issues or shorts to ground
- Bad connectors or pins
- Low fuel level or contamination in fuel tank
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but you may not know the accurate fuel level, so fill the tank regularly.
Will this code come back after resetting?
It can come back if the underlying issue isn't fixed, such as a bad sensor or wiring.
Why does this code pair with SPN 546?
SPN 546 indicates high fuel level sensor circuit issues, which can be related to the same physical components.
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