Fuel Temperature Sensor
Fuel temperature sensor reading is out of range or faulty.
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What it means (plain English)
The fuel temperature sensor measures how hot the fuel is, helping the engine control computer ensure it runs efficiently. If it's not working properly, it can send bad information, affecting how the engine runs.
What the computer is actually seeing
The engine control module (ECM) expects to receive fuel temperature readings between 10°C to 90°C (50°F to 194°F). If the signal is below 10°C or above 90°C or if it sees an open circuit (no signal), it triggers a fault code.
What a healthy reading looks like
Fuel temperatures usually range from 25°C to 70°C (77°F to 158°F) during normal operation; expect 12V signal when operational.
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.
- 1Inspect the fuel temperature sensor wiring and connectors for any damage or corrosion. Is there visible damage?
- 2Check the resistance of the fuel temperature sensor at different temperatures. Should be around 2kΩ at 25°C, rising with temperature. Is it within range?
- 3Verify fuel level in the tank. Is it adequate?
- 4Using a scan tool, check for other related codes. Are there any additional codes logged?
- 5If no issues found but fault persists, consider replacing the fuel temperature sensor. Did replacing it solve the issue?
Common causes
- Faulty fuel temperature sensor
- Damaged wiring or connectors
- ECM issues
- Low fuel level or contamination in the fuel system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's usually safe to drive if there are no drivability issues, but fix it soon as it can affect engine performance.
Will this code come back after repair?
If the root cause is properly addressed, the code should not return.
Why does this code pair with SPN 487?
SPN 487 is often related as it tracks fuel pressure which can also be influenced by temperature variations.
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