How to detect a bad speed sensor

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The speed sensor is responsible for measuring how fast the vehicle is moving and sends this signal to the automotive computer (ECU). The ECU uses this signal to calculate the exact moment when the automatic transmission should change gear.

Also, this sensor makes the speedometer work properly. Without a doubt, this is a very important element and that is why it must always work properly.

The speed sensor is located in the transmission of the caron the output shaft, or also on the crankshaft of the car and like most elements, it can stop working and affect the proper functioning of the vehicle.

It’s best to learn to spot when it’s failing and change it before it breaks. That’s why, Here we tell you how to detect a bad speed sensor.

1.- Sudden or inappropriate speed changes

When there are symptoms of a faulty transmission speed sensor, the powertrain control module is unable to properly control gear shifting within the transmission. This can cause the transmission to rev higher before shifting into gear or the overdrive transmission to be late and unable to shift up to the highest gear.

Hard shifting can damage internal components such as valve bodies, hydraulic lines, and even mechanical gears in some cases.

2.- Cruise control inactive

The transmission speed sensor not only monitors input and output shaft speed, it also plays a role in monitoring cruise control. When there are some pproblems with engine speed sensor, an error code will be sent to the car’s ECU. The cruise control will then turn off and will not activate when you press the button.

3.- The light comes on check engine

If your car has some engine speed sensor problemsthe powertrain control module (PCM) will set a diagnostic trouble code and illuminate the light check engine Light on the dashboard of the vehicle. Then the check light engine comes on sporadically and intermittently when accelerating. The overdrive light may also come on or off for no apparent reason.


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