Fuel Temperature Sensor A
Fault with the Fuel Temperature Sensor A input signal.
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What it means (plain English)
The fuel temperature sensor measures how hot the fuel is as it moves through the system. If it’s too hot or cold, the engine may not run properly.
What the computer is actually seeing
The engine control module (ECM) expects a voltage signal between 0.5V (cold fuel) and 4.5V (hot fuel). If the signal is outside this range or missing, it triggers the fault code.
What a healthy reading looks like
Signal should be within 0.5V to 4.5V under normal operating conditions; typical operational range is around 1.0V to 3.5V depending on fuel temp.
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 to the fuel temperature sensor for damage or loose connections. Are they all intact? Yes: go to step 2; No: repair wiring/connectors and retest.
Common causes
- Open circuit in the fuel temperature sensor wiring
- Faulty fuel temperature sensor
- Short circuit to ground or power in the sensor circuit
- Corroded connector pins
- Contaminated or poor-quality fuel affecting sensor readings
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive as it may affect fuel delivery and engine performance, fix soon.
Will this code come back after clearing it?
If the root cause isn't fixed, yes, the code is likely to return.
What happens if I ignore this code?
Ignoring it can lead to poor engine performance and potential fuel system damage.
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