Contributing Writer, GM-Trucks.com
Back in December, GM-Trucks.com member Jammin87SS posted a note here about a class-action suit related to GM 8-speed automatic transmissions. This transmission was used widely by GM, including in the Sierra, Silverado, Colorado, and Canyon pickup trucks. Owners have been complaining of shuddering and hesitation. Owner of a Silverado, Ed T., wrote a typical description for CarComplaints. He says, "Ever since I bought this truck new there has always been a shifting problem. This problem occurs whenever I slow down to a fairly low speed and then accelerate. When I accelerate there is a hesitation for a second or 2. This is very annoying and could potentially be dangerous. I have contacted my dealer and he just says "that's the way they shift, no fix"??? Dealer also stated that the transmissions have a learning chip and shifts the way a person normally drives - that's total BS. I have had my truck for over 2 years and it still shifts poorly. Besides the above I love my truck very much, GM just has to fix this problem..."
GM knows there is a problem. It has issued both notices to its dealer's technicians and also TSBs. However, it has yet to find a solution that works.
There is a class action suit that you can learn more about here. Our questions for our members are; 1) Have you experienced any issues with your 8-speed, and 2) was the dealer able to fix it? Let us know in the comments below.
Looking for some help. I have a 2019 Crew Cab LT Trail Boss with 4,600 mi, 5.3 engine. Blew an oil cooler line a few weeks ago, drove 200ft with the blown line and shut the truck off. After telling the dealer and tow company not to start it the first thing I hear from the dealer is that the truck was stalling out as they drove it into the shop/moved it and that a nice feature on these new trucks is that the engines don't blow with low oil, they just stall out. Next day the dealer tells me that it's a blown engine. I've been telling the dealer for a week now that I want a new truck. What's a reasonable course of action for the dealer here? What should I expect as a solution or should I ask for as a solution? They're currently tearing apart the engine so GM can evaluate what exactly is wrong and do a cost analysis.
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