Fuel Temperature Sensor Circuit Voltage High
The fuel temperature sensor is reading a voltage that is too high.
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What it means (plain English)
The fuel temperature sensor measures how hot the fuel is; if it's getting too high, the engine control module thinks there's something wrong and throws this code.
What the computer is actually seeing
The fuel temperature sensor sends a signal typically between 0.5V to 4.5V to the ECM, depending on the temperature. If the voltage exceeds 4.5V, the ECM triggers the fault code.
What a healthy reading looks like
0.5V (at -40°C) to 4.5V (at 125°C) is normal; check for values outside this range.
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 any visible damage or corrosion.
- 2Inspect the connector for loose pins or corrosion; correct as needed.
- 3Measure the voltage at the fuel temperature sensor connector; should be within 0.5V to 4.5V. If it's above 4.5V, locate the cause of the excess voltage.
- 4If the wiring and connections are good, replace the fuel temperature sensor.
Common causes
- Faulty fuel temperature sensor
- Wiring issues (short to voltage)
- Corroded or damaged connector
- ECM malfunction
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive long distances; monitor performance.
Will this code come back after clearing?
If the underlying issue isn't fixed, the code will likely come back.
Why does this code show up with other codes?
Codes often appear together when they relate to the same system or sensor issue.
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