Fuel Temperature Sensor Circuit Low
This code indicates that the fuel temperature sensor is reporting a low voltage condition.
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 temperature sensor measures how hot the fuel is. If it sends a signal below what the engine expects (like under 0.5V), the system thinks the fuel is too cold or the sensor is faulty.
What the computer is actually seeing
Engine control unit detects a voltage reading from the fuel temperature sensor that is lower than 0.5 volts, which suggests a possible sensor failure or wiring issue.
What a healthy reading looks like
Normal voltage from a functioning fuel temperature sensor should range from 0.5V to 4.5V, depending on temperature.
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.
- 1Inspect the wiring and connectors for the fuel temperature sensor. Look for fraying, corrosion, or loose connections. Fix any issues found.
- 2Using a multimeter, measure the voltage at the fuel temperature sensor connector. If the voltage is below 0.5V, go to step 3. If above 0.5V, consider replacing the sensor first.
- 3Disconnect the sensor and test the wiring harness for continuity to the engine control unit (ECU). If there's no continuity, repair the wiring. If there is continuity, replace the sensor.
Common causes
- Faulty fuel temperature sensor
- Wiring issue (short to ground or open circuit)
- Bad connector or corrosion
- Electrical interference from other components
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive with this code?
Yes, but performance may be affected and emissions could increase. Fix it soon.
Will this code come back after clearing it?
If the underlying issue is not resolved, it likely will.
Why does this code appear with other codes?
Faulty sensors or wiring can trigger multiple issues simultaneously.
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 →