As GM Authority reported back in May 2023, General Motors was hit with a Canadian class action lawsuit related to the 8LXX eight-speed automatic transmission found in a plethora of GM vehicles. Now, another similar lawsuit has been filed in Quebec, Canada.
According to a report from Car Complaints, the lawsuit alleges that affected transmissions have a tendency to shudder, jerk, shift hard, shake and hesitate. The plaintiff claims that these issues are dangerous because the affected vehicles have the potential to suddenly decelerate while driving and without warning.
The lawsuit stated that it included, “All the persons in Quebec (including but not limited to individuals, corporations, and estates) who, prior to the date of authorization of this action as a class action, bought or leased vehicles (new or used) designed, manufactured, marketed, distributed, sold, warranted, or serviced by GM and equipped with GM’s Hydra-Matic 8L90 transmission or Hydra-Matic 8L45 transmission.”
The lawsuit lists a wide range of GM vehicles equipped with affected transmissions, including:
- 2015 – 2019 Chevy Corvette
- 2015 – 2023 Chevy Colorado
- 2015 – 2023 Chevy Silverado
- 2016 – 2023 Chevy Camaro
- 2017 – 2023 Chevy Express (4.3L LV1 V6 and 2.8L LWN I4)
- 2015 – 2017 GMC Yukon Denali XL
- 2015 – 2019 GMC Canyon
- 2015 – 2019 GMC Sierra
- 2017 – 2023 GMC Savana (4.3L LV1 V6 and 2.8L LWN I4)
- 2015 – 2017 Cadillac Escalade
- 2016 – 2023 Cadillac ATS-V
- 2016 – 2023 Cadillac CTS-V
- 2016 – 2023 Cadillac CT6
For those who may be unaware, GM Authority has covered the various class-action lawsuits filed against General Motors over the past few years. In fact, we’ve even gone so far as to call on the Detroit-based automaker to address the purported problems in an op-ed published back in 2019. Looking forward, many GM vehicles have replaced the eight-speed transmission with the newer GM 10-speed that was co-developed with Ford. However, it’s worth noting that certain models like the Camaro, Colorado and Silverado still use this transmission in certain applications.
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Comments
Strange, every 8 speed we have had through our shop, flush with updated fluid and all good, never have replaced one or have had any further issues with one, and we have been doing that bulletin for about 6 years now. Stronger transmission than the 6 speed in my opinion.
I have this transmission in my Cadillac which just turned 100,000 miles. Never had a problem with it. People comment on the smooth luxurious ride.
Update: my ATS developed the dreaded transmission vibration a few weeks ago. I took it to the dealer for a fluid flush and filter change and crossed my fingers. It works perfectly again! With my coupon and Cadillac rewards points it only cost $160.
GM should pay for the $400- $500 flush on the transmission. Thy did the mistakes.
The flush is a short term patch or a workaround and not a fix. It’s an attempt to push the issue down the road until customers are out of warranty or until they decide to trade their problems away. I speak from experience, if you would like to see the problem, come on over. I have (2) I can show you. These transmissions have serious issues and GM is turning a blind eye. It’s why I’m NEVER buying another GM, they are not looking out for their customers.
I have a 2020 express
Been in the shop 5 times.
Two valve bodies and at the shop currently
Scary $hit when your passing at 120 km then your vehicle goes dead
Well that is not what this is about.
You have other issues.
Fluid flush and fine.
No, the fluid flush is a temporary workaround to buy GM tie until you are out of warranty. I speak from experience. I’ve had the flush, problems persist. Truck is still well under 100k KM……
Why would you be passing someone at 120 anyway??
Mountain roads. You have an opportunity to pass a semi truck you don’t much time
Km not mph
Paul, my special friend,,, 120 “KILOMETERS” “KPH” (75MPH) “is the max legal speed in Canada.
What bugs me is GM in the US has acknowledged problems with canyon and Colorado pick up with Frame rot always appearing drivers side just forward of the leaf spring buckle. In Canada nothing.
Truck just broke 160k and the frame is finished.
I have owned fleets of Gm and never hot a nickle out of them.
6 visit in GM authorized a tear down and inspection
Results were transmission not worth repairing. Too many clutch packs and damage cheaper for replacement unit
They did a flush and reprogram twice then hard and delayed shifting. Changed the valve body twice.
The last time I was passing then the van would not accelerate. I couldn’t pass. Had to hit the brakes and go back behind the vehicle I was trying to pass. Scary $hit
How do I latch on to this law suit. I have a 2019 Colorado that Rev at 5600-6500 at 110-120km/h. It delays and jacks terrible on shifting to drive or reverse.
the previous comment from PAUL…..WHAT YEARS OF COLORADO/CANYON TRUCKS is he referring to that have FRAME ROT
I purchased a 2015 Chevrolet Silverado High Country new in 2015. One month a after i got it the dealer said to bring it in for a recall onthe transmission. They reprogrammed the transmission suttel valve and it has not shifted right sence. I have had it back and finally over two years later they said GM recommend changing the fluid and filter to fix the problem. It didn’t help. Like the class action suite says,they told me it’s supposed to shift like that. They just kept putting me off until the warranty ran out..
Yeah, my truck lurches forward when I put it in D as though my foot is on the gas. It shudders at constant highway speeds. The transmission whines. It jerk shifts between 1-2 especially first drive of the day and it pushes the truck forward when I’m trying to stop.. This transmission has serious issues and GM is ignoring us. The flush and valve body replacement did nothing to help (except ntroduce that whine I mention above, it started after the flush / valve replacement). I leart that the only thing important to GM is my money, not my satisfaction. Last one I buy — at the price they want for them, I need them to fix problems and not push them down the road or sweeep them under the rug.