Fuel Temperature Sensor 1
Indicates an issue with the fuel temperature sensor input.
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What it means (plain English)
The fuel temperature sensor measures how hot the fuel is. If it fails, it can send wrong signals, which messes with engine performance and fuel efficiency.
What the computer is actually seeing
The Engine Control Module (ECM) looks for a signal from the fuel temperature sensor that should range between 0.5 to 4.5 volts, corresponding to temperature values from -40°C to 120°C. If it sees a reading outside of this expected range, it triggers the fault code.
What a healthy reading looks like
Expected signal between 0.5V (low temp) to 4.5V (high temp) based on -40°C to 120°C fuel temperature.
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 wiring and connector for damage or corrosion at the fuel temperature sensor. Repair any issues found.
- 22. Measure the voltage at the fuel temperature sensor connector. The reading should be between 0.5V to 4.5V with the engine running. If out of range, sensor or wiring issue is likely.
- 33. If wiring is good, replace the fuel temperature sensor. Retest the system for proper operation and code clearance.
- 44. If the problem persists after sensor replacement, check the ECM for software updates or faults.
Common causes
- Faulty fuel temperature sensor
- Damaged wiring or connector to the sensor
- Poor fuel quality causing inaccurate readings
- ECM software issue
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It is generally safe to drive, but performance may be affected. Monitor how the vehicle runs.
Why does this code sometimes pair with SPN 2290?
SPN 2290 is also related to fuel temperature measurements, indicating a possible multiple sensor issue.
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