Engine fuel temperature sensor 2 - faulty signal
The engine fuel temperature sensor 2 is sending an incorrect signal.
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What it means (plain English)
The computer uses the fuel temperature sensor to monitor how hot the fuel is. If it's too high, it can cause performance issues. When the sensor fails, it can send the wrong signals, making the engine run poorly or not at all.
What the computer is actually seeing
The engine control module (ECM) expects a voltage range from the fuel temperature sensor between 0.5V (cold fuel) to 4.5V (hot fuel). If the sensor sends a voltage outside this range for a set period, it triggers the fault code.
What a healthy reading looks like
Normal fuel temperature should be approximately 100°F to 180°F (38°C to 82°C) with voltage between 0.5V to 4.5V.
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 wiring and connectors to fuel temperature sensor 2 for damage or corrosion. Fix any issues found.
- 22. Measure the voltage at the fuel temperature sensor while the engine is running. It should be between 0.5V and 4.5V under normal conditions.
- 3 - If voltage is out of range, proceed to step 3. - If voltage is within range, suspect a faulty ECM or further sensor issues.
- 43. Disconnect the fuel temperature sensor and measure resistance according to manufacturer specifications.
- 5 - If resistance is faulty, replace the fuel temperature sensor. - If resistance is good, further diagnose the ECM.
Common causes
- Damaged or corroded wiring to fuel temperature sensor 2
- Faulty fuel temperature sensor
- Poor connection at the sensor or ECM
- Contaminated fuel affecting the sensor reading
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity, so you can drive but expect reduced performance and possible stalling.
Will this code come back after clearing?
It may return if the underlying issue isn't fixed, like a faulty sensor or wiring problem.
Why does this code pair with other codes?
This code can trigger alongside others related to fuel system performance due to shared components or issues.
Working a real vehicle right now?
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