Engine Fuel Temperature Sensor 1 - Voltage Above Normal
Fuel temperature sensor reading is too high.
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 gets too high, the engine computer thinks there might be an issue, like overheating fuel.
What the computer is actually seeing
The engine control module expects a fuel temperature between 20°C and 80°C (68°F to 176°F). If it sees a temperature reading above 80°C for more than 2 seconds, it sets this code.
What a healthy reading looks like
Expected fuel temperature range is 20°C to 80°C (68°F to 176°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. Check the fuel temperature sensor wiring for damage or corrosion. Repair or replace as needed. Decision: If wiring is okay, go to step 2.
- 22. Measure the voltage at the fuel temperature sensor connector with the engine running. Expected voltage is around 0.5V to 4.5V depending on temperature. Decision: If voltage is outside expected range, replace the sensor. If within range, go to step 3.
- 33. Inspect the fuel system for any overheating issues, such as low fuel level or poor cooling flow. Check coolant levels and pump operation. Decision: If overheating is found, address the cause. If no overheating, further diagnose ECM or other related issues.
Common causes
- Faulty fuel temperature sensor
- Wiring issue between the sensor and ECM
- Fuel system overheating due to lack of coolant flow
- Engine running too hot due to other issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's better to fix this soon as overheating fuel can lead to engine damage.
Will this code come back after a reset?
If the underlying issue isn't fixed, yes, it'll likely return.
Why is this code paired with other SPN codes?
Related codes can indicate a larger fuel system issue, often linked to temperature problems.
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 →