Transmission Oil Temperature Sensor: Importance and Signs of Failure

When the transmission oil temperature sensor has a problem, the car may experience phenomena such as smooth gear shifting, high fuel consumption, or even the transmission warning light is on.

In this article, we will learn about the gearbox oil temperature sensor, operating principles, signs of damage, causes of errors and effective repair solutions to ensure the gearbox always works best.

1. What is a transmission oil temperature sensor?

The transmission oil temperature sensor is an important device in the automatic transmission control system of a car. It continuously measures the transmission oil temperature, helping the central control system (TCM) optimize the gear shifting process.

This sensor works on the principle of changing resistance according to temperature, helping to protect the gearbox from overheating and damage.

2. Signs of damaged transmission oil temperature sensor

When this sensor fails, the transmission control system cannot receive an accurate signal about the oil temperature, causing symptoms such as:

- Vehicle enters limp mode: Vehicle speed is limited, usually from 40-60 km/h.
- Gearbox shifting is not smooth: The car jerks slightly when shifting gears, shifting gears at the wrong time.
- Check Engine Light is on: Warning of a problem with the sensor or gearbox.

Increased fuel consumption: The system cannot optimize the shifting process, resulting in high fuel consumption.
3. Causes of damaged transmission oil temperature sensor

Oil temperature sensors can fail for a variety of reasons, including:

- Degraded gearbox oil: Oil that is not changed regularly or is contaminated can increase temperature and damage the sensor.
- Electrical circuit fire: Faults in the circuit or wiring can cause erroneous signals.

- Water entering the gearbox: Damage to sensors and other components.
- Sensor life: After a period of use, the sensor may wear out and become inaccurate.
- Mechanical impact during repair: Improper oil change or repair may damage the sensor.
4. Repair solution when sensor fails

When the oil temperature sensor fails, early diagnosis and treatment are important to protect the transmission. Repairs include:

- Replace oil temperature sensor with correct part number: Make sure to select the correct compatible part number.

- Replace valve body assembly if sensor is integrated: Some cars like Mercedes, BMW require replacing the entire control unit.
- TCU Software Update: Some vehicles require a software update after replacing the sensor.

- Change transmission oil and check cooling system: Ensure oil is always at a high quality level and cooling system operates efficiently.

5. Gear Oil Temperature Sensor and Service From Gartz

To protect the transmission system and enhance vehicle performance, the use ofhigh quality gear oilis very important. Gartz offers automatic transmission fluid products to suit every need, fromATF oilfor automatic transmission toCVT oilfor CVT.

Regular maintenance and use of genuine transmission fluid will help prolong the life of the oil temperature sensor and the entire transmission system. Come toGartzto ensure your car always runs smoothly, saves fuel and is safe on every journey.