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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.

2016 Cadillac CT6 has arrived

We have known for a while that the 2015 New York Auto Show would mark the debut of Cadillac's latest flagship model. But after months of waiting as Caddy slowly revealed details, the 2016 Cadillac CT6 has finally arrived. The sedan is a technological tour de force for the brand and inaugurates a long list of new technologies. The CT6 will begin production at the Detroit-Hamtramck Assembly plant in late 2015 and will go on sale with three engine options. Caddy won't release final figures yet, but based on preliminary numbers, we know the base 2.0-liter turbocharged four-cylinder will make 265 horsepower. Stepping up to the newly revised 3.6-liter V6 will net buyers an estimated 335 hp, and finally there will be the 3.0-liter twin-turbo V6 with an output of around 400 hp. All of these engines will be mated to eight-speed automatic transmissions, and six-cylinder models will get standard all-wheel drive that will be able to constantly vary the power sent to the front wheels. Carrying those powertrains is the new, aluminum-intensive Omega architecture. In addition to the lightweight metal making up the platform, the entire exterior also uses it to provide an estimated curb weight of less than 3,700 pounds. The decision to shed mass makes the CT6 a featherweight in its class – for comparison, the lightest, six-cylinder Audi A8 weighs 4,365 pounds. The sedan rides on a 122.4-inch wheelbase and is 204 inches long. That makes the Cadillac about 1.3 inches shorter than the smallest BMW 7 Series, but the Caddy is projected to tip the scales at less than both the big Bimmer and even the 5 Series, too. Cadillac wants the CT6 to be a luxury sedan that drivers can enjoy. In addition to the low weight, there's an available Active Chassis System throughout the range with rear-wheel steering and Magnetic Ride Control. When combined with the all-wheel-drive system, it means every corner of the car is both driving and steering the vehicle. Inside, the CT6 offers a ton of tech and luxury. Drivers are held in massaging, leather seats, and rear passengers also get adjustable chairs that are heated and cooled. Quad-zone climate controls keep everyone comfortable. Plus, in addition to the 34-speaker Bose audio system and streaming rearview mirror, there are features like a 10.2-inch CUE infotainment system with a capacitive touchscreen and console-mounted touchpad. The display also shows a 360-degree view outside and can even record video when the security system is activated.

Cadillac shows dealers convertible rendering

Cadillac is getting serious about revitalizing and expanding its lineup, and to that end, a new report claims that brand boss Johan de Nysschen has been showing plans for several new models to the marque's dealer body - among them, a new convertible.
The droptop which Cadillac reportedly showed its dealers in sketch form, would be based on the same platform as the ATS and CTS, those it's unclear to which (if either) of those model lines the new convertible would be added, or whether the design features a canvas or folding hardtop roof. One way or another, it would be the first time Cadillac would offer a convertible since the Corvette-based XLR roadster was discontinued more than five years ago.
Quoting an unnamed brand spokesperson, Cadillac would "like to introduce an open car to the portfolio at some point," however, "it's not likely to be one of the near-term portfolio additions."