What does the transmission input sensor do?

Transmission input/output sensors calculate the transmission’s actual gear ratio during usage. Typically, two sensors communicate the transmission data to the vehicle’s powertrain control module. The first sensor, referred to as the input sensor, monitors the speed of the transmission’s input shaft.

What is a transmission input shaft speed sensor?

The Input Shaft Speed Sensor measures the rotational speed of the Input Shaft, taken from the upper countershaft drive gear. The Main Shaft Speed Sensor measures the rotational speed of the transmission gearing exiting the main case, taken from the auxiliary upper countershaft gear.

Are the input and output speed sensors the same?

As the name indicates, input shaft speed (ISS) sensor is used for monitoring the speed of the input shafts of the transmission, whereas the output shaft speed (OSS) sensor is used to monitor the speed of the transmissions’ output shafts.

What happens when input speed sensor goes bad?

One of the most common signs of a bad speed sensor is abnormal automatic transmission operation. If the VSS is faulty, the transmission may exhibit symptoms such as delayed shifts, hard shifts, and limited gear operation.

Can you drive with a bad transmission speed sensor?

That is why in general, it is unsafe to drive a vehicle with a broken wheel speed sensor. If the wheel speed sensor becomes damaged or wears out, initially you probably won’t notice much difference in the way your car performs if your ABS light comes on unless you are driving on slippery pavement.

How can you tell if the transmission sensor is bad?

Common signs include harsh or improper shifting, cruise control not working, and the Check Engine Light coming on.

Can I drive my car with the speed sensor failing?

However, when it comes to wheel speed sensors, a minor-seeming glitch may turn into a major safety risk. That is why in general, it is unsafe to drive a vehicle with a broken wheel speed sensor.