The 8-Speed GM Transmission Defect
GM's 8-speed automatic transmissions have generated widespread consumer complaints about shuddering, hesitation, and harsh shift behavior -- particularly during low-speed acceleration. GM has issued multiple technical service bulletins with software recalibrations, but plaintiffs allege these fixes are temporary and fail to address the underlying hardware defect in the torque converter.
Internal GM documents obtained in discovery allegedly showed early awareness of the shudder issue, supporting the fraud claims that GM sold affected vehicles without adequate disclosure.
How to Join the GM Transmission Class Action
You do not need to take active steps -- if you own an affected vehicle and the class is certified, you are automatically included unless you opt out. When a settlement is reached, you'll receive notice with instructions to submit a claim form.
To best position your claim: document all transmission complaints and service visits with dates and service order numbers; keep all correspondence with GM or dealers; get documentation showing the TSB applied and any ongoing symptoms.
Who Qualifies
Owners of GM vehicles with 8L90 or 8L45 transmissions -- primarily 2015-2022 Silverado, Sierra, Camaro, Colorado, Canyon, and some Cadillac models -- who experienced unresolved shuddering or harsh shifting may qualify. Related: how to file a class action lawsuit.
Status 2026
Class action proceedings are active. No settlement has been announced. Monitor class action settlement databases for your specific model.
How to Get Legal Help
If you believe you qualify based on the eligibility criteria described above, the next step is a free consultation with an experienced attorney. Most plaintiff-side attorneys handling these cases work on contingency -- meaning you pay nothing unless your case results in a recovery. Bring any relevant documentation including receipts, correspondence, or evidence of the harm you experienced.
To stay current on case developments, claim deadlines, and settlement news, bookmark this page and subscribe to LawsuitWatch alerts. Coverage is updated as new court filings, settlement announcements, and eligibility changes are made public.
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How to Join GM Transmission Class Action: 8-Speed Shudder Lawsuit: Frequently Asked Questions
Answers to the most common questions about this case and your legal options.
How do I join the GM transmission class action?
You're automatically included if your vehicle is covered and a class is certified. Submit a claim form when a settlement is announced.
What GM vehicles have this problem?
2015-2022 Silverado, Sierra, Colorado, Canyon, Camaro, and some Cadillac models with 8L90 or 8L45 transmissions.
Did GM fix the shudder?
TSB software updates provide partial improvement. Plaintiffs allege the root hardware defect is not fully resolved.
What can I recover?
Settlement terms TBD -- likely repair reimbursement, extended warranty, or partial vehicle credit.
What should I document?
All service visits, technician notes, TSB applications, and records of the shudder continuing after service.