Low Fuel Level
Indicates low fuel level in the tank.
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)
When the fuel level is low in the tank, the sensor sends a signal to the engine control module (ECM), alerting it to potential fuel supply issues. This can lead to performance problems and engine stalling if not addressed.
What the computer is actually seeing
The ECM reads a voltage signal from the fuel level sensor, typically ranging from 0.5 volts (full) to 2.5 volts (empty) depending on the fuel level. A voltage reading below 0.5 volts triggers the SPN 514 code.
What a healthy reading looks like
Normal fuel level readings should generally be between 0.5V (100% filled) to 2.5V (empty).
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: Ensure there is enough fuel in the tank. If low, fill it up and see if the code clears.
- 22. Visually inspect the fuel level sensor wiring: Look for damage or corrosion. Repair as needed and retest.
- 33. Measure voltage at the fuel level sensor connector: Expect between 0.5 to 2.5 volts when the tank is full to empty. If readings are outside this range, replace the sensor.
- 44. Check ground continuity: Ensure the sensor ground is good to prevent false readings. Repair any issues found and retest.
Common causes
- Faulty fuel level sensor
- Corroded or damaged wiring
- Bad ground connection
- Dirty fuel tank or filters
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you can drive, but low fuel might cause stalling or poor performance.
Will this code come back after clearing?
If the underlying issue isn't fixed, it will likely return, especially if running on low fuel.
Why does this code pair with SPN 520?
SPN 520 indicates the fuel level sensor is out of range, often triggered by similar issues as SPN 514.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →