Low or High Fuel Temperature
The ECM detects a fuel temperature reading out of range.
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What it means (plain English)
The engine computer (ECM) is getting a fuel temperature reading that’s either too low or too high for normal operation. This can affect fuel delivery and engine performance.
What the computer is actually seeing
The ECM monitors the temperature of the fuel in relation to normal operational parameters, typically expecting values between 0°C and 85°C (32°F to 185°F).
What a healthy reading looks like
Fuel temperature should generally be between 10°C and 70°C (50°F to 158°F) during standard operation.
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 temperature sensor wiring for damage or loose connections. Decision: If wiring is good, proceed to step 2. If bad, repair the wiring.
- 22. Measure the voltage from the fuel temperature sensor while the engine is running. Expected voltage: 0.5V to 4.5V. Decision: If within range, proceed to step 3. If out of range, replace the sensor.
- 33. Inspect fuel quality. Contaminants can cause incorrect readings. Decision: If fuel quality is good, system may need recalibration. If poor, drain and replace fuel.
Common causes
- Faulty fuel temperature sensor
- Wiring issues or poor connections
- Incorrect fuel type or contaminants in fuel
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix this soon, as it can affect engine performance, but it's generally drivable.
Will this code come back after clearing?
If the underlying issue is not fixed, yes, the code will likely return.
Why does this code appear with low power issues?
Temperature affects fuel viscosity and combustion efficiency; incorrect readings can lead to performance problems.
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