GM Lemon Law Claims in California: Chevrolet, GMC, Buick, and Cadillac

Is my Silverado's transmission shudder covered by the lemon law?

Yes, a persistent transmission shudder that the dealer cannot fix under warranty can support a lemon law claim, because it affects the use, value, and safety of the truck. The Song-Beverly Consumer Warranty Act requires GM to buy back or replace a vehicle when it fails to repair a warranty-covered defect after a reasonable number of attempts, under Civil Code section 1793.2(d)(2).

The shudder complaint is well documented. Owners of 2015 to 2019 trucks and SUVs equipped with GM's 8L45 and 8L90 eight-speed automatics reported hesitation, hard shifts, and a shudder or shake under acceleration, and GM issued technical service bulletins addressing the condition. A federal class action over these transmissions was allowed to proceed as a certified class in 2024 and then decertified by the Sixth Circuit in June 2025, which means affected owners now generally pursue individual claims. That is exactly what a Song-Beverly case is. We cover the repair history that wins these cases in our GM transmission shudder deep dive.

What other GM defects show up in lemon law claims?

Beyond the 8-speed shudder, the most heavily documented GM defect in recent years is the Chevrolet Bolt battery fire risk. NHTSA announced recalls that eventually covered every Bolt EV and EUV from the 2017 through 2022 model years after GM and its battery supplier identified manufacturing defects in battery cells that could cause a fire, and the remedies ranged from full battery pack replacement to diagnostic software that initially limited charging.

A recall repair does not end your lemon law rights. If your Bolt sat for months waiting for a battery, or if the vehicle still is not right after the recall work, those facts feed directly into the "reasonable number of repair attempts" analysis. Days out of service count, whether the visit is called a recall, a TSB, or an ordinary warranty repair.

Did General Motors opt in to the new AB 1755 procedures?

Yes. As of July 6, 2026, the DCA's published list shows General Motors LLC elected in to the AB 1755 procedures codified at Code of Civil Procedure sections 871.20 through 871.30 on April 23, 2025. An election covers the manufacturer's brands, which for GM means Chevrolet, GMC, Buick, and Cadillac, and it binds GM for five years, so it runs into 2030.

Manufacturers can elect in at any time, so it is worth confirming GM's current status on the Department of Consumer Affairs' published list at dca.ca.gov when your claim starts.

Because GM has elected in, your claim runs on the new track: you generally must sue within one year after your warranty expires, and no later than six years after the vehicle was originally delivered; you must send a written notice at least 30 days before filing suit to preserve civil penalties; and the case goes through mandatory mediation early on. If a manufacturer has not opted in, the older rules apply, with a longer limitations period and no pre-suit notice requirement. Our AB 1755 hub walks through both tracks in detail.

How many repair attempts does GM get?

GM gets a reasonable number of attempts, and for a serious defect that can be as few as two. The Tanner Consumer Protection Act, Civil Code section 1793.22, creates a presumption in your favor if, within 18 months or 18,000 miles, there were two or more attempts to fix a defect that could cause death or serious injury, four or more attempts for the same problem, or a cumulative total of more than 30 calendar days out of service.

Transmission shudder cases often hit the four-attempt threshold because dealers commonly try a fluid exchange first, then a torque converter, then further repairs. Bolt battery cases often hit the 30-day threshold instead, because packs were backordered. Keep every repair order either way.

What does a GM buyback involve, step by step?

A GM buyback is a repurchase of the vehicle: GM refunds your down payment and monthly payments, pays off the remaining loan balance, and reimburses official fees and incidental costs like towing and rentals. The process typically runs through a written demand supported by your repair orders and purchase contract, review by GM's repurchase staff or an outside administrator, a written offer with the mileage offset calculation, and then a surrender appointment at a dealership where GM takes the truck back and issues payment. California law then requires the title to be branded as a lemon law buyback before GM can resell the vehicle.

Two cautions. First, GM's opening offer often understates what the statute requires, especially on incidental expenses. Second, under the opted-in procedures, the pre-suit notice and mediation steps have deadlines that can quietly cost you the civil penalty if handled wrong.

How is the mileage offset calculated on a GM buyback?

The offset divides the miles at the first repair attempt for the defect by 120,000, then multiplies by the price you paid, under Civil Code section 1793.2(d)(2)(C). Say you paid $58,000 for a Sierra Denali and first reported the shudder at 14,400 miles: 14,400 divided by 120,000 is 0.12, times $58,000 is a $6,960 deduction. Miles driven after that first visit cost you nothing. You can estimate your buyback with our calculator.

What if GM stalls or lowballs?

A manufacturer that willfully fails to honor its buyback obligation can be ordered to pay a civil penalty of up to two times your actual damages under Civil Code section 1794(c). And fee-shifting under Civil Code section 1794(d) makes GM responsible for a prevailing consumer's attorney fees and costs, which is why hiring counsel does not come out of your recovery.

Comparing brands? See our guides to Ford and Lincoln, which also opted in to AB 1755, and to Jeep, Ram, Dodge, and Chrysler, whose parent FCA US also opted in.