Fuel Temperature Sensor 1
Fuel temperature sensor is out of range or faulty.
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 reads too high or too low compared to what’s expected, the engine control unit (ECU) gets a warning.
What the computer is actually seeing
The engine control unit (ECU) monitors input from the fuel temperature sensor. It expects a signal voltage typically between 0.5V (cold) to 4.5V (hot). If it sees a value outside of this range, it sets the SPN 0713 code.
What a healthy reading looks like
0.5V to 4.5V for normal operation; expected fuel temperature around 50-80 °C (122-176 °F) under normal conditions.
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.
- 1Check wiring and connectors for the fuel temperature sensor. Look for corrosion or damage. If found, repair or replace accordingly.
- 2Measure the voltage at the fuel temperature sensor connector while the engine is running. It should be within 0.5V to 4.5V. If it's out of range, proceed to the next step.
- 3If the voltage is out of range, replace the fuel temperature sensor. If the sensor is new, inspect the wiring back to the ECU for damage.
- 4Clear the code and test drive the vehicle. If the code returns, check the ECU for faults.
Common causes
- Faulty fuel temperature sensor
- Wiring issues like shorts or opens in the circuit
- Connector problems such as corrosion or loose connections
- ECU software glitch
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity indicates it’s best to repair this soon but the vehicle can still be driven short distances.
Will this code come back after I clear it?
If the issue isn’t fixed, it will likely return.
Why does this code sometimes appear with other fuel system codes?
It can be related to overall fuel temperature affecting the fuel system performance, which can trigger other faults.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →