Fuel Temperature Sensor 1
Indicates an issue with the fuel temperature sensor reading.
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What it means (plain English)
The fuel temperature sensor measures how hot the fuel is. If it reads wrong, the engine might not run right because the computer can't make good decisions about fuel delivery and combustion.
What the computer is actually seeing
The engine control module (ECM) detects a fault with the fuel temperature sensor, usually when the resistance is outside normal limits (like below 10 ohms or above 100 ohms).
What a healthy reading looks like
Normal fuel temperature readings should be between -40°C to 100°C (-40°F to 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 at the fuel temperature sensor. Look for corrosion, damage, or loose connections. Replace or repair as needed. Decision: Is the wiring intact? Yes: Go to step 2. No: Repair wiring/connectors and retest.
- 22. Measure resistance at the fuel temperature sensor connector. It should be around 2.5k ohms at room temperature. Decision: Is the resistance within normal range? Yes: Go to step 3. No: Replace the fuel temperature sensor.
- 33. Check the fuel temperature against actual engine operation. Use a scan tool to compare the readings to the expected range (between -40°C to 100°C). Decision: Is the sensor reading accurate? Yes: Further diagnose ECM. No: Replace the fuel temperature sensor.
Common causes
- Faulty fuel temperature sensor
- Wiring issues or damaged connectors
- Corroded terminals at the sensor or ECM
- Excessive fuel contamination affecting sensor readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity. You can drive it short distances but should fix it soon to avoid running issues.
Will this code come back after I clear it?
If the underlying issue isn’t fixed, yes, it will likely return.
Why does this code sometimes pair with SPN 2806 or SPN 2808?
These codes relate to other temperature sensors in the fuel system, which may indicate a broader issue with temperature readings.
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