Where is the Tcm located

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your vehicle. The Transmission Control Module (TCM) on your Yukon is typically located under the hood, mounted in the left front corner behind the engine control module. It will be secured with bolts and plugged into the wiring harness, so once you find it, be careful when removing and handling it. These components are pretty delicate, so getting a trusted mechanic involved may be a good idea. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!