Because both the engine and the transmission can rotate at different speeds, it’s vital that the vehicle’s computer is able to calculate the speed of the transmission’s torque converter or input shaft. The transmission speed sensor is a magnetic sensor that provides this information, allowing the transmission to shift smoothly. The sensor counts the internal number of revolutions of the transmission and transmits that information to the transmission control unit, where the data is used to determine the rotational speed. If the speed is too great, the gears need to be changed – it’s the same principle as watching the tachometer and shifting before the RPMs get too high while driving a vehicle with a manual transmission.
The transmission speed sensor isn’t a part that can be inspected during normal maintenance, nor does it have a specific service interval for replacement. If you notice abnormal shifting or speedometer readings, have one of our expert mechanics diagnose the sensor.
With a defective transmission speed sensor, the transmission control unit will be unable to determine the actual speed, which can make shifting gears difficult or even impossible. This will render the car unusable, so it is very important to have the sensor replaced as soon as it is determined to be faulty.
Tell us what the problem is (e.g the car is not starting or I need new shock absorbers). What kind of car you drive and your contact information.
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