Class-Action Lawsuit Filed Against GM Over Alleged Defects with its 8-Speed Automatic Transmission


Class-Action Lawsuit Filed Against GM Over Alleged Defects with its 8-speed Automatic Transmission

General Motors is already facing a lawsuit over alleged cooling problems with some of its C7 Corvette Z06 models.

Now the U.S. carmaker has been hit with another class-action lawsuit citing problems with its 8-speed automatic transmission that debuted in several GM vehicles as early as 2015.

Affected vehicles include 2015-19 Corvettes as well as the following:

  • 2015-2019 Chevrolet Silverado
  • 2017-2019 Chevrolet Colorado
  • 2016-2019 Chevrolet Camaro
  • 2015-2017 Cadillac Escalade and Escalade ESV
  • 2016-2019 Cadillac ATS and ATS-V
  • 2016-2019 Cadillac CTS and CTS-V
  • 2016-2019 Cadillac CT6
  • 2015-2019 GMC Sierra
  • 2015-2019 GMC Yukon and Yukon XL
  • 2017-2019 GMC Canyon.

The lawsuit claims that the defect makes the vehicles shake, jerk or “hard shift” when accelerating or decelerating.

GM has already issued 13 technical service bulletins about shifting issues, but the lawsuit alleges that none of the solutions has cured the problem.

Class-Action Lawsuit Filed Against GM Over Alleged Defects with its 8-speed Automatic Transmission

Among the dozens of complaints received by the NHTSA are the following:

Known transmission issue which causes the vehicle to buck and surge when you pull up to at a stop light, Stop sign, on highway, or in traffic. Extremely Dangerous…We are afraid to drive the vehicle as it surges forward at any given moment. Contacted Cadillac and they are unwilling to do anything to help with the issue. They are concerned that this would start them down a slippery slope for repairing many 2015,16,17’s that have the same issue…Someone is going to get seriously injured or killed as a result of this transmission issue.”

— Lexington, MA, September 13th, 2018

The gmc 2017 canyon vibrates at highway speed 60mph to 70mph. The 2nd day after I bought it took it on long Trip found it had vibration problems…this concerns me. For being stranded or worse causing an Accident from something coming loose. I`ve already had to tighten up my spare tire. I bought this pickup for long trips since I’ve retired. I also feel if they’re going to sell crap like this, they need to put the vibration issues on the accessory list so buyers will have the option whether to buy or not. I would have not bought a $40,000.00 vibrator!!”

— Norman, OK, February 5th, 2018

[My torque converter] failed at 16000 miles and the one they replaced will likely fail again in another 16k miles. This is bad. I noticed it when I pressed on the accelerator and as I increased speed up to 45 mph. It rattled and rocked badly. The gmc repairman said, ‘yeap…. ever since 2016 all these damn Torque converters have been failing in the canyons And Colorado’s because gm and Chevy changed the size and strength of the metal used in order to reduce the weight of the vehicle. We will replace it, But I can assure you it will fail again and you’ll have to bring it back…[to] change out again.’”

— Vero Beach, FL, December 31st, 2018

Purchased my 17 Chevrolet Silverado 1500 on 11/28/17 and returned it to the dealership on 12/1/17. This was due to a severe shuddering & shifting in the transmission & severe shake in the front end at 70-90mph. They balanced & rotated the tires, saying the issue was fixed, I picked the vehicle back up on 12/4/17 but the issue was not fixed & an electrical issue had also occurred. I took the vehicle back on 12/7 /18 with the same complaints…They had to replace the torque converter…I picked it up on 12/22/17, issue with the transmission was still not resolved…Owners with the same issues are being told gm knows but can’t fix transmission issue.”

— Sophia, NC, March 22, 2018

The lawsuit blames the shuddering and jerking problems on internal transmission issues that lead to “undue friction” and cause the hydraulic systems and gears not to work correctly. Eventually this leads to metal shavings circulating throughout the transmission, which has caused some consumers to have to flush out their transmissions. Other vehicles have required new transmissions, torque converters or valve bodies because of the alleged defect.

Source: via

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  1. Some if these complaints could be from many things besides the tranny. Shudder in front end but only at 70-90 mph? Balance the wheels correctly and check the entire running gear before simply blaming the transmission.

  2. My 2016 Z51 Stingray has transmission issues also. Not serious yet but aggravating and makes me think hard about road trips. I have 23K miles on it.
    How can one join in the lawsuit.

    [email protected]

  3. My 2017C7 base also has some quirks. When cold and during the first few miles, the transmission is very laggy when upshifting from 1st to 2nd gear. this remains in place until the temperature gauge starts to climb, then is slowly disappears as the car warms up. This is very annoying and I hope no damage is being done during this laggy slipping shift!

  4. 2016 Cadillac CTS-V: dealer replaced torque converter, did the 3 flush program, reflushed again and reprogrammed. Total mileage 24,000

    2016 Corvette ZO6: dealer did the fluid flush program. Total mileage 29,000

    All of the above actions done by GM dealers under warranty….things seem to be ok now but who knows what tomorrow will bring.

  5. All of the defect allegations are true and every C7 automatic owner knows it. Most dealers just blow you off when you take the car in for service. This class action lawsuit was inevitable, and frankly, GM’s failure to fix the problem is inexcusable. Makes you wonder what major problems will surface once the C8 starts production.

  6. I have a 2015 C7 2LT Z51 package I have been having problems with my rotors. I continue to get pulsation and vibration from them and they get hot and warp. I had them replaced 3 times and resurfaced twice.
    GM is doing nothing about this problem.

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