Fuel Temperature Sensor Circuit High Input
This code indicates a high voltage signal from the fuel temperature sensor.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The fuel temperature sensor measures how hot the fuel is. If it sends a signal that's too high (like over 5 volts), the computer gets worried and sets a code.
What the computer is actually seeing
The engine control module (ECM) expects a signal around 0.5 to 4.5 volts from the fuel temperature sensor. Anything significantly higher signals a problem.
What a healthy reading looks like
Expected fuel temperature sensor voltage range is 0.5V to 4.5V corresponding to fuel temperatures of -40°C to 150°C.
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 wiring and connectors of the fuel temperature sensor for damage or corrosion.
- 2Check for a high voltage (above 4.5V) at the fuel temperature sensor signal wire with the key on, engine off.
- 3If above 4.5V, check for a short circuit to voltage elsewhere in the wiring harness.
- 4If the wiring is good and the voltage is normal, replace the fuel temperature sensor and retest.
Common causes
- Shorted fuel temperature sensor wiring
- Faulty fuel temperature sensor
- Corrosion in connector terminals
- ECM software issues
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive with this code active?
It may still be drivable, but expect potential fuel delivery issues and possible damage to related components.
Will this code come back after clearing it?
If the underlying issue is not fixed, the code is likely to return.
Why is this related to fuel temperature?
Fuel temperature affects engine performance, so monitoring it is critical for optimal running.
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