Two Major American Car Brands Just Suffered the Biggest Drop in Customer SatisfactionFirst for AutosWhitney DanhauerFri, September 25, 2026 at 3:23 PM UTCAdd us on GoogleGeneral MotorsTwo well-known American car brands saw customer satisfaction take a dive over the past year.Buick and Cadillac had particularly steep declines in the 2026 American Customer Satisfaction Index Automobile Study (ACSI). Both General Motor brands fell significantly compared with their 2025 scores.Buick was hit the hardest out of any brand included in the study. Its score fell 16 percent, from 81 out of 100 in 2025 to just 68 in 2026.AdvertisementAdvertisementThat dropped Buick to nearly the bottom of the mass-market category, ahead of only Chrysler, which scored 67.Cadillac didn't fare much better. The luxury brand's satisfaction score dropped 15 percent, falling from 81 to 69, and it finished last among the luxury brands included in the study.General MotorsPart of the reason those declines were so noticeable is that customer satisfaction across the entire auto industry fell just 1 percent overall. Satisfaction with mass-market brands also dropped 1 percent, while the luxury segment declined 3 percent.The American Customer Satisfaction Index surveyed 6,699 customers between July 2025 and June 2026. It looks at several parts of ownership experience, including vehicle safety, dependability, driving performance, comfort, technology, gas mileage and expected resale or trade-in value.AdvertisementAdvertisementWhile the ACSI didn't attribute Buick or Cadillac's plunging numbers to one specific problem, it did find some common complaints among car owners.For mass-market vehicles, the main complaints revolved around electrical, battery and software problems, service and dealer issues and engine or powertrain problems. Luxury owners generally reported the same complaints, with service, dealer and customer support issues landing on top of the list.Read More From First For AutosNASCAR Star Ryan Blaney Admits Carson Hocevar Got the Better of Him in Wild FightHonda CR-V Driver Goes in for Oil Change, Mechanic Says Dealership Tried to Sell Him a Fake RepairFlock Cameras That Track Cars and License Plates Blasted With Shotguns in KentuckyThis story Two Major American Car Brands Just Suffered the Biggest Drop in Customer Satisfaction first appeared on First For Autos. Follow First For Autos on Yahoo so you don't miss what's coming next.