Fuel Temperature Sensor 2 Circuit High
The fuel temperature sensor signal is above the normal range.
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What it means (plain English)
The fuel temperature sensor measures how hot the fuel is, and if it reads too high, it means the sensor is either damaged or there's an issue with the wiring.
What the computer is actually seeing
The engine control unit (ECU) receives a voltage signal from the fuel temperature sensor that typically ranges from 0.5V (low temp) to 4.5V (high temp). A value above 4.5V triggers this code.
What a healthy reading looks like
Normal fuel temperature sensor outputs should be between 0.5V and 4.5V under normal operating conditions, with oil temperatures around 40°C (104°F) to 100°C (212°F).
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. Inspect wiring and connectors to the fuel temperature sensor for any signs of damage or corrosion. Decision: If damaged, repair or replace.
- 22. Measure the voltage at the fuel temperature sensor connector with the key on, engine off. Expected voltage is between 0.5V and 4.5V. Decision: If voltage is out of range, suspect a bad sensor or wiring issue.
- 33. If the sensor voltage is in range but the code persists, check ECU for faults or replace the fuel temperature sensor.
- 44. Clear the fault code and run the engine to see if the code returns. If it does, further diagnose ECU or related circuitry.
Common causes
- Faulty fuel temperature sensor
- Shorted wiring or connector
- Corroded pins or connections
- ECU malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive excessively as high fuel temperature might impact performance and emissions.
Will this code come back after clearing?
If the underlying issue isn’t fixed, yes, the code will likely return.
What should I check first?
Always start with inspecting the wiring and connectors for any visible issues.
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