Fuel Level Sensor Circuit
Fuel level sensor signal is out of range or not present.
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 not sending the correct signal to the computer, making it think the fuel level is wrong.
What the computer is actually seeing
The Engine Control Module (ECM) expects a fuel level reading between 0-5 volts. If the reading is above or below this range, it triggers the code.
What a healthy reading looks like
A functional fuel level sensor should output 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.
- 11. Check the vehicle's fuel level. Ensure it has fuel, above the minimum level.
- 22. Inspect the wiring and connectors at the fuel level sensor. Look for broken wires, corrosion, or poor connections. Repair as necessary.
- 33. Measure the voltage output from the fuel level sensor with a multimeter. It should be between 0.5V and 4.5V.
- 44. If the voltage is out of range, replace the fuel level sensor and retest.
- 55. If the voltage is correct, check for proper ground and power supply to the sensor. Ensure a good ground at the ECM as well.
- 66. If all checks are correct and the code persists, consider testing or replacing the ECM.
Common causes
- Faulty fuel level sensor
- Wiring or connector issues
- Faulty ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's driveable, but you may see inaccurate fuel level readings, so fill up to avoid running out unexpectedly.
Will this code come back after clearing?
If the issue isn't resolved, the code will likely return after a few drive cycles.
Why does it pair with different codes?
SPN 1750 can trigger alongside other fuel system codes related to sensor performance or circuit issues.
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 →