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Information On TCM

  1. The Transmission Control Module (TCM) is located in the engine room and is the control center of the electronic transmission control system.
  2. The TCM must be maintained at a temperature below 85°C (185°F) at all times. This is most essential if the vehicle is put through a paint baking process. The TCM will become inoperative if its temperature exceeds 85°C (185°F). Therefore, it is recommended that the TCM be removed or that temporary insulation be placed around the TCM during the time the vehicle is in a paint oven or other high temperature process.
  3. The TCM is designed to process the various inputs and then respond by sending the appropriate electrical signals to control transmission upshift, downshift, shift feel and torque converter clutch engagement.
  4. The TCM constantly interprets information from the various sensors, and controls the systems that affect transmission and vehicle performance. By analyzing operational problems, the TCM is able to perform a diagnostic function by displaying DTC(s) and aid the technician in making repairs.
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