Ensuring you are Ready for the Road Ahead , the Dorman Automatic Transmission Speed Sensor monitors the speed of the semi truck and transfers the data to the Transmission Control Module (TCM). This ensures the cruise control function maintains a specific speed set by the driver. This sensor can also aid several Anti-Llock Braking Systems (ABS) to prevent wheel lock-up during hard braking. If this module fails or malfunctions, it can lead to issues with shifting, cruise control, or other speed-dependent systems in the vehicle. Gain smooth operation of the vehicle with this transmission speed sensor. Dorman has a distinguished reputation in the heavy duty truck and trailer aftermarket, manufacturing a variety of parts for a complete repair. Through advanced engineering, Dorman successfully checks into today’s most common failures to figure out the why, ultimately delivering modern solutions that not only match OEM parts, but solve known issues. FleetPride is your First Click in Heavy Duty .