GM Transmission Lawsuit, Were You Affected? — Barba v. General Motors, No. 4:26-cv-13030

If you drive a 2019 Sierra or Silverado and the transmission jerks, hesitates, or shifts like it’s fighting itself — you weren’t imagining it. General Motors is now facing a class action in the U.S. District Court for the Eastern District of Michigan claiming exactly that. Two California truck owners say GM knew about the flaw for years and sold the trucks anyway. Here’s what that means for you.

More related articles: GM’s other transmission and engine defect cases

GM Transmission Lawsuit — Key Facts

Field	Detail
Lawsuit Filed	August 25, 2026
Defendant	General Motors LLC
Alleged Harm	Harsh shifting, jerking and hesitation in lower gears from Hydra-Matic 8L90/8L45 transmissions
Law Alleged	UNVERIFIED — specific causes of action not yet available in public docket summaries
Who Is Affected	California buyers/lessees of 2019 GMC Sierra, Chevrolet Silverado, GMC Canyon or Chevrolet Colorado built after March 1, 2019 with the 8L90 or 8L45 transmission
Court & Case Number	U.S. District Court, Eastern District of Michigan — No. 4:26-cv-13030
Current Stage	Newly filed; no rulings on class certification or dismissal yet
Lead Plaintiff Deadline	UNVERIFIED — not yet set
Settlement Status	No settlement. No claim form exists.
Last Updated	September 17, 2026

Who Is General Motors and Why Are They Being Sued for This?

GM designs, builds and sells trucks under the Chevrolet and GMC brands, including the Silverado and Sierra — two of the best-selling pickups in the country. The lawsuit says GM put its Hydra-Matic 8L90 and 8L45 eight-speed transmissions in these trucks knowing the design had a shifting flaw. That put GM in a position to profit from trucks it allegedly knew wouldn’t shift the way buyers expected.

What Did GM Do to Sierra and Silverado Owners Between 2019 and Today?

Plaintiffs Matthew Barba and Renzo Calvo-Saez both bought new 2019 Silverados equipped with the 8L90 or 8L45 transmission. Both say the trucks shifted hard, jerked, and hesitated — especially when slowing down. Barba brought his truck to a dealership more than once and was told the behavior was normal. Calvo-Saez brought his in three separate times over about a year. He says the problem got bad enough that his wife won’t drive the truck anymore.

The lawsuit claims GM knew about the transmission flaw as early as 2013 — six years before these specific trucks rolled off the line. As evidence, the complaint points to GM’s own “Gen 2” transmission redesign, which the company approved internally in early 2018 but didn’t introduce until the 2023 model year. That’s a four-year gap between GM recognizing the fix was needed and actually shipping it — and every truck sold in between kept the older design.

This case is separate from, but related to, the broader multidistrict litigation already underway against GM over the same 8L90 and 8L45 transmissions — including Speerly v. General Motors and Battle v. General Motors, both also pending in the Eastern District of Michigan. Those cases cover different model years and states. If you also want the fuller picture on GM’s other active transmission and engine defect litigation, we’ve broken that down separately.

That four-year gap is the detail worth sitting with. GM didn’t just miss the problem — the lawsuit says it had already engineered the fix and chose not to put it in your truck.

Are You Part of the GM Transmission Lawsuit?

Here’s exactly how to know if this case includes you.

The complaint covers California consumers who:

• Purchased or leased a new or used 2019 model year GMC Sierra
• Bought a 2019 Chevrolet Silverado built after March 1, 2019
• Own a 2019 GMC Canyon or Chevrolet Colorado with the same transmission
• Have a truck equipped specifically with the Hydra-Matic 8L90 or 8L45 transmission

Not included: owners of 2015–2018 model year trucks (those fall under the separate Speerly case), and anyone outside the covered model years regardless of transmission type.

GM Truck Owners Outside California — Are You Still Covered?

Not under this specific case. Barba v. GM is currently filed on behalf of California consumers only. If you live in another state and have the same transmission complaint, your claim would likely fall under one of GM’s other pending transmission cases or would need to be evaluated separately by an attorney in your state.

Not sure if you qualify for the GM transmission lawsuit? A free consultation with a product liability attorney can help you figure out where your truck fits before any deadlines are set.

What Are GM Truck Owners Asking the Court to Award?

No money yet. No claim form yet. The lawsuit asks the court to certify a class, find GM liable, and award damages — but none of that has happened. This is a newly filed complaint, not a settlement.

What Could GM Truck Owners Receive If This Case Settles?

Impossible to predict this early. Related GM transmission cases have sought compensation for the amount owners overpaid for a defective vehicle, plus the cost of repairing or replacing the transmission itself. What Barba and Calvo-Saez actually recover — if anything — depends on class certification, the evidence GM is forced to produce, and any eventual settlement or verdict. Talk to a product liability attorney if you want to understand your options now rather than wait.

What Should GM Truck Owners Do Right Now?

1. Most affected owners don’t need to do anything to preserve their rights yet — no claim form exists, so there’s nothing to file. No panic.
2. Save your records now: repair invoices, service advisor notes, and anything in writing where a dealership called the shifting “normal.”
3. Write down when the jerking or hesitation happens — write it down with dates and mileage, not just memory.
4. There’s no lead plaintiff deadline set yet for this case. That will matter more once the court schedules a class certification hearing.
5. Monitor the docket for Case No. 4:26-cv-13030 in the U.S. District Court for the Eastern District of Michigan for motions and rulings.
6. If your truck falls outside this specific case — different state, different model year — an individual claim under your state’s consumer protection or lemon laws may still be an option. A Ford F-150 owner facing a similar 10-speed transmission defect is in a comparable spot right now.

That paperwork sitting in your glovebox right now might be the only proof you’ll have. Start the folder today.

GM Transmission Lawsuit — Full Timeline

Milestone	Date
GM allegedly knew of transmission defect	2013 (per complaint)
Class period begins	2019 model year production
“Gen 2” transmission redesign approved internally	Early 2018
Class vehicles built	After March 1, 2019
Redesigned transmission introduced	2023 model year
Lawsuit filed	August 25, 2026
Lead plaintiff deadline	UNVERIFIED — not yet set
Next scheduled hearing	UNVERIFIED — no hearing date public yet

GM Transmission Lawsuit — Frequently Asked Questions, No. 4:26-cv-13030

Is there a class action lawsuit against GM for transmission problems right now? 

Yes. Barba, et al. v. General Motors LLC, No. 4:26-cv-13030, was filed August 25, 2026 in the U.S. District Court for the Eastern District of Michigan over 8L90/8L45 transmissions in 2019 Sierra, Silverado, Canyon and Colorado trucks.

Do I need to do anything right now to be part of the GM lawsuit? 

No. There’s no claim form and no deadline yet. If a class is certified later, eligible owners will typically be notified automatically.

When will the GM transmission case settle? 

There’s no way to know yet. The case was just filed, and cases like this often take a year or more to reach class certification, let alone a settlement.

Can I file my own lawsuit against GM instead of joining the class? 

Yes, in most cases you can pursue an individual claim, especially under your state’s lemon law, instead of waiting on the class. An attorney can tell you if that’s a better option than staying in the class.

How will I find out if the GM lawsuit settles? 

Court-approved notice typically goes out by mail or email to affected owners if a settlement is reached. Watch the docket for Case No. 4:26-cv-13030 or check back on this page for updates.

What does “lead plaintiff” mean for the GM case and why does the deadline matter? 

The lead plaintiffs — Barba and Calvo-Saez — represent the whole proposed class. No lead plaintiff deadline has been set publicly yet for this case.

What specific laws does GM allegedly violate? 

UNVERIFIED. The complaint’s specific causes of action weren’t available in public docket summaries at the time of writing. We’ll update this once the full complaint is reviewed.

How much could GM Sierra and Silverado owners get if this case settles? 

There’s no figure yet — no settlement exists. Related GM transmission litigation has sought reimbursement for overpayment and repair costs, but any number here would be a guess.

Sources Used in This GM Transmission Article

• Court Docket — Barba, et al. v. General Motors LLC, No. 4:26-cv-13030, U.S. District Court, Eastern District of Michigan (filed August 25, 2026): https://companyprofiles.justia.com/company/general-motors/dockets/case
• GM Form 10-Q, Q1 2026 — status of related 8L90/8L45 transmission litigation: https://www.sec.gov/Archives/edgar/data/0001467858/000146785826000035/gm-20260331.htm
• Sixth Circuit ruling on related Speerly v. General Motors class certification — Cohen Milstein case summary: https://www.cohenmilstein.com/case-study/general-motors-litigation/
• Reuters — “GM must face big class action over faulty transmissions”: https://www.aol.com/gm-must-face-big-191425891.html

Researched and written by Israr Ahmad, legal content researcher and founder of AllAboutLawyer.com. All facts verified against the Eastern District of Michigan court docket, General Motors’ SEC filings, and Reuters reporting as of September 17, 2026. Last Updated: September 17, 2026.

This article is for informational purposes only and does not constitute legal advice. Laws vary by state and individual circumstances differ. For advice about your specific situation, consult a qualified attorney.