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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.

GM considering new powertrain options for large SUVs

Aside from the new General Motors offerings, there's not a whole lot of action going on in the fullsize SUV segment. That doesn't seem to be stopping GM from pushing the envelope in the market as Automotive News is reporting that the automaker is looking to introduce some new powertrain options into the Chevy Tahoe (and Suburban), GMC Yukon (and Yukon XL) and the Cadillac Escalade - all have been redesigned for the 2015 model year.
Now, we already know that GM and Ford are collaborating on nine- and ten-speed transmissions for a broad range of applications (including the big SUVs), but this new report says that GM is also considering other options as a way to one-up the competition and, of course, to optimize fuel economy. AN quotes Jeff Luke, executive chief engineer for GM trucks, as saying that "interesting powertrain technologies" are coming including a return of a hybrid SUV and possibly even a diesel engine. Although it sounds like the latter could come down to how customers respond to the 2014 Jeep Grand Cherokee EcoDiesel.

The GMC Hummer EV could spawn a smaller electric truck

Over 90,000 motorists have reserved a GMC Hummer EV, and the truck's relative popularity has convinced executives to consider launching a smaller and presumably more affordable model. While nothing is official yet, the Hummer EV's smaller sibling could be a midsize pickup. Citing "people familiar with the matter," Automotive News reported a smaller Hummer EV exists in the design studio that General Motors operates in California. There's no word on what it looks like yet, though it presumably borrows at least some of the rugged-looking styling cues that characterize the controversial, 9,200-pound truck. Interestingly, the smaller model could bring the Hummer name to Europe. It's too early to provide technical specifications. The model hasn't received the proverbial green light for production but Automotive News added that it's a "priority project" and that it has "a good chance of going into production." If and when it does, it's reasonable to assume the truck will use the Ultium battery technology found under the full-size Hummer EV, among other electric models from General Motors. GMC hasn't commented on the report, and it hasn't announced plans to launch a second Hummer-branded electric pickup. If the report is accurate, the baby Hummer is at least a couple of years away from hitting showrooms. First, the Hummer EV SUV will enter production. We've been here before: a downward expansion is exactly how the now-defunct Hummer brand was born. The military-bred H1 spawned the H2 for 2002 and the H3 for 2006. An even smaller off-roader previewed by the 2008 HX concept was planned but ultimately canned. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.