Fuel Temperature Sensor Circuit Low
Indicates a problem with the fuel temperature sensor circuit.
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What it means (plain English)
The fuel temperature sensor is sending a low voltage signal, which suggests it's either damaged or there's an issue in the wiring or connectors leading to it.
What the computer is actually seeing
The engine control module (ECM) is monitoring the fuel temperature sensor. It expects a voltage signal in a specific range (typically 0.5V to 4.5V under normal conditions). If it sees a voltage below 0.5V, it flags this code.
What a healthy reading looks like
Normal fuel temperature sensor voltage varies between 0.5V (0°C) and 4.5V (100°C), depending on your 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 fuel temperature sensor wiring and connectors for damage or corrosion. If found, repair or replace as necessary. → Decision Point: Are there visible issues? Yes: Repair/replace. No: Go to step 2.
- 22. Measure the voltage at the fuel temperature sensor connector with the engine on. It should be between 0.5V and 4.5V. → Decision Point: Is the voltage within range? Yes: Go to step 3. No: Replace the sensor or repair the wiring if necessary.
- 33. Disconnect the sensor and test continuity of the wiring back to the ECM. Check for shorts to ground. → Decision Point: Is continuity good? Yes: Replace the sensor. No: Repair the wiring.
Common causes
- Faulty fuel temperature sensor
- Damaged wiring or connectors
- Corrosion at connector pins
- Short circuit to ground in sensor circuit
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity indicates a potential drivability issue, so it's best to repair soon.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will likely return.
Why is this code paired with SPN 3568?
SPN 3568 is linked to the same fuel temperature sensor and can indicate related issues.
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