FUEL TEMPERATURE SENSOR (FTS) SIGNAL VOLTAGE HIGH
The fuel temperature sensor voltage is higher than expected.
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 diesel fuel is. If it's sending a signal that's too high, the engine control unit (ECU) thinks the fuel is hotter than it really is and may adjust performance based on that incorrect data.
What the computer is actually seeing
The computer expects a voltage signal from the fuel temperature sensor between 0.5V and 4.5V based on the fuel temperature range. A voltage above this range indicates a fault.
What a healthy reading looks like
The fuel temperature sensor should output between 0.5V (around -40°C or -40°F) and 4.5V (around 125°C or 257°F).
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 connector and wiring for damage or corrosion. If any issues are found, repair them. If not, proceed to step 2.
- 22. Measure the voltage output of the fuel temperature sensor using a multimeter. It should read between 0.5V and 4.5V. If the reading is above 4.5V, replace the sensor.
- 33. If the sensor is within spec, inspect the ECU for faults or updates. If updates are needed, apply them. Then retest the system.
Common causes
- Faulty fuel temperature sensor
- Wiring short to voltage
- Poor ground connection
- Corroded connectors
- ECU software issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity, so you can drive but may experience reduced engine performance. It's best to check it soon.
Could this code come back after fixing?
Yes, if there are underlying issues like wiring faults, it can reappear.
Why does this code sometimes pair with SPN 2519?
SPN 2519 indicates a low voltage signal, which can happen if the same wiring issues affect both the high and low signals.
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 →