Auto blog

Fullsize GM SUVs have a problem that's making owners sick

Some fullsize SUV owners are getting sick, thanks to a buffeting and vibration problem in 2015 model year examples of the Chevy Tahoe and Suburban, Cadillac Escalade, and GMC Yukon. According to owners' complaints to the National Highway Traffic Safety Administration, the issue can vary from an annoying vibration inside the cabin to an experience so severe that it leads to dizziness and headaches. General Motors is aware of the complaints, but the fix isn't so simple. According to spokesperson Tom Wilkinson to Autoblog, the company "has been tracking this issue for a while." The problem has a fairly low incidence rate, but when it does occur the issue can be "uncomfortable and annoying for owners." There's no precise cause for the issue, Wilkinson claims, and in some cases, simply balancing the tires or changing the door seals can make it go away. However, not all of the fixes are so simple. AutoGuide dug deep into the problem and discovered a GM preliminary information bulletin that advised dealers to remove the headliner and to check the roof's bonds to the bows that go across the vehicle. However, that document included a note that the solution might not entirely eliminate things. According to AutoGuide, adding Dynamat insulation to the roof sometimes helped the problem. A GM spokesperson also told AutoGuide the company fixed the problem at the end of the 2015 model year, and didn't go into any more detail. This roof issue seems linked to some of the worst droning in these SUVs. According to one complaint from a 2015 Suburban owner to NHTSA: "Roof will not remain attached to the roof bows. This causes the buffeting similar to a window being down when all are up. The results span from annoying to painful." A 2015 Yukon owner claims to have another alleged cause for the problem in a NHTSA complaint from February 2015. This person brought their SUV to the dealer seven times over the course of four weeks for vibrations. The dealer replaced the driveshaft, suspension components, and more, but nothing worked. According to an engineer to the service adviser: "In an effort to prevent roll overs, they designed the frame and body mounts too stiff. There are 40 engineers working on issues, they have no solutions that work across the board." Wilkinson told Autoblog that GM is working with customers on an individual basis to rectify things. Since these are newer vehicles, dealers should also fix the problem under warranty.

How GM's grueling 24-hour test gets the kinks out of its performance cars

One of the biggest challenges automakers face when designing a high-performance car is making sure that it is both fast and reliable. For General Motors, any car that might be taken to the track by its owner - like the Corvette, Camaro Z/28 (shown above) and the Cadillac CTS-V, for example - undergoes a rigorous and strenuous 24-hour test by engineers at the Milford Proving Grounds, as pointed out by Car and Driver.
We've posted on this topic in the past - on a video showing the Camaro ZL1 being brutalized, for instance - but this article gives a more in-depth look at what actually happens behind the scenes... including what that poor ZL1 went through. Though the test isn't for 24 hours straight, the cars are pushed as hard as possible by some of GM's best drivers with only the brakes and tires replaced frequently.
We don't want to ruin the fun for you, but it is an interesting article that tells just some of what GM does to develop its sports cars. Check out the full article over at Car and Driver for the rest of the story.

GM Cadillac chief: New CT5 will replace 3 sedans; EVs coming

DETROIT - The head of General Motors' Cadillac luxury division said on Thursday the brand will shrink its lineup of sedans and expand its offerings of sport utility vehicles and hybrid and electric vehicles in response to market shifts. Expanding Cadillac's global sales is central to GM's overall profit strategy, and Cadillac has reported a 27 percent increase in worldwide sales through the first half of the year. However, in the United States, now the brand's second largest market behind China, Cadillac sales are down 1.6 percent and combined sales of the brand's four sedan models have plummeted 16.3 percent through the first half of the year. That has forced GM to order layoffs at two Michigan factories that build Cadillac cars, and raised questions about the long term future of the plants. "We have to rebalance our sedan portfolio," Johan de Nysschen told Reuters in interview, offering new details about the strategy. Cadillac will not directly replace the current XTS, CTS or ATS sedans when they end their life cycles in 2019, he said. Instead, Cadillac will use a single new car called the CT5 to appeal to consumers shopping for sedans priced between $35,000 and $45,000. New versions of the CT6 sedan will be offered to customers who want a larger car starting at $50,000. Sources had told Reuters last week that GM was considering ending production on six cars including the CT6 and XTS and models from Chevrolet and Buick. That report now appears only half-right as far as Cadillac is concerned. The new CT5 will be built at a factory near Lansing, Michigan, that currently builds the slow-selling Cadillac ATS and CTS models. A small luxury sedan to compete with the Audi A3 will be built in the same plant, de Nysschen said. Cadillac will offer more SUVs, starting with a compact model called XT4, followed by a larger SUV with three rows of seats due by 2019 to compete with vehicles such as Volvo's current XC90 model. Volvo, owned by China's Zhejiang Geely Holding Group, scored a public relations coup by announcing plans earlier this month to power all its vehicles with either hybrid or all-electric technology starting in 2019. The move challenges Tesla, which has eclipsed more established brands with tech savvy luxury buyers. Cadillac has plans "not dissimilar to what Volvo has announced," with more electrified vehicles launching in the second half of the next decade, de Nysschen said.