Fuel Temperature Sensor Circuit Low
Fuel temperature sensor reading is too low.
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What it means (plain English)
The fuel temperature sensor is telling the computer the fuel is colder than it should be, which can lead to performance issues because fuel won't atomize properly if it's too cold.
What the computer is actually seeing
The engine control module (ECM) sees voltage from the fuel temperature sensor at or near 0 volts instead of the expected range of 0.5V to 4.5V, indicating an issue with the sensor or its circuit.
What a healthy reading looks like
Fuel temperature should typically be between 0°C and 100°C (32°F - 212°F) for normal operation, corresponding to a sensor voltage of 0.5V to 4.5V depending on the specific sensor design.
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 temperature sensor wiring for damage or corrosion. If damaged, repair or replace the wiring.
- 2Inspect the connector at the fuel temperature sensor. Make sure it's clean and free of debris. Secure any loose connections.
- 3Test the voltage at the fuel temperature sensor harness: it should be within 0.5V to 4.5V. If it’s outside of this range, continue diagnostics.
- 4If voltage is good, replace the fuel temperature sensor. Monitor for any further codes after replacement.
Common causes
- Faulty fuel temperature sensor
- Wiring or connector issues in the sensor circuit
- Open or shorted circuit
- Cold ambient temperatures affecting readings
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but fuel performance could be inconsistent, especially in extreme temperatures.
Will this code come back after resetting the ECM?
Yes, if the underlying issue isn't fixed, the code will likely return.
Why does it pair with other fuel temperature codes?
Multiple codes can trigger due to similar issues in the fuel system or sensor malfunction.
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