On or about [XXX], the Transmission Control Module, FAILED, on my 2011GMC Denali 2500 6.6 diesel. It was a KNOWN faulty part.General Motors was aware of the issue years ago. This part should have been deemed a Safety Recall item. Imagine, pulling a trailer down a busy Freeway, with Semi's presence. Module goes out, truck goes idle, people hurt or worse. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Lagrande , OR, USA

TCM failed. Couldn-??t find the parts required. Truck sat 700 miles away from me for four weeks. Had to have part repaired in hopes it worked. As of now I still have some issues but would not have the truck at all if I had to wait for a part

- Covington, GA, USA

When vehicle is warm and shut off, upon restart it will not go in to any gear, there was no warning lamps. An independent repair facility determined the Transmission Control Module was defective. General Motors has no parts available, and I know fro a fact it is a rather large issue.

- Bull Shoals, AR, USA

Transmission control module put my truck in limp mode while drinking down the highway.

- Pulaski , WI, USA

Vehicle was exhibiting harsh shifting; upshifts/downshifts. Pulling into driveway from rural highway vehicle downshifted and passenger was thrown forward and almost hit the dash with her head, felt like it was shifting into park. Had vehicle towed to dealership. Vehicle would not shift into any gear for mechanic. Transmission repaired along with a wiring harness that prevented the main computer to communicate with the transmission. Reporting this because this is dangerous if this wiring harness fails as we could be out in the middle of nowhere with a vehicle that will not drive. Attaching invoice of repairs that show what parts were replaced by the dealer.

- Grand Ronde, OR, USA