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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 will likely build PHEV batteries in China soon

It's a big week for batteries. Friday, Tesla will hold a big event at its Gigafactory in Reno, NV. But even in Michigan, there are things happening on the electrified automotive front. This was proven when GM invited journalists to its Brownstown Battery Assembly Plant today, highlighting the six different battery packs it makes for nine vehicles around the world (plus a tenth, coming to Asia, that has not yet been announced). During our tour, we learned a few interesting tidbits that we thought readers would like to hear: The Cadillac CT6 plug-in hybrid launches in China this fall before coming to the US next year. GM builds the battery packs in Michigan and ships them to China for final assembly in the PHEV. For now, this is all fine for GM to qualify for China's incentives for building green cars in the country. But, as Bill Wallace, GM's director of global battery systems, told AutoblogGreen, this could change thanks to the country's 'Made in China 2025' plan. The situation is "evolving," he said, and it's a safe assumption that GM will need to build packs in China some day. For the CT6 PHEVs that will be sold in the US, the batteries will make a round trip, since GM will only build the plug-in version in China. As for the range of the CT6 PHEV, that hasn't been announced, but since China offers incentives for vehicles that get at least 50 kilometers (31 miles), that's a likely target (the US range (UPDATE: GM did announce an expected range for the CT6 PHEV in the US at the LA Auto Show last fall, saying it would "travel approximately 30 miles on a full electric charge"). The battery pack in the CT6 is also a clunky box-type thing, totally unlike the near-elegant T-shape used in the Volt. This despite the fact that the guts of the two packs are similar. Both have 192 li-ion cells and weigh almost the same, but GM tuned the CT6 pack for acceleration instead of range, the way it did with the Volt's pack. Still, the main reason the packs are different is because the CT6 is a rear-wheel drive vehicle, and the tunnel that the Volt's pack uses is occupied by the driveshaft. Despite the highly touted second-gen Chevy Volt going on sale last year, GM still has the capacity to build battery packs for the old, first-gen model. This is because the company is legally required to be able to provide replacement packs for warrantied vehicles (for up to 10 years), and the second-gen packs don't fit into the first-gen vehicles.

Cadillac adds torque-number badging to most new models starting in 2020

Few phrases describe huge swaths of America better than a phrase spotted on the back of a top-fuel dragster at an NHRA event: "You can never have too much horsepower or ammunition." If Cadillac CEO and wily Canuck Steve Carlisle has his way, the revised phrase would substitute "torque measured in Newton-meters" for "horsepower." Starting with the 2020 model year, America's luxury brand will add torque figure badges to CT and XT models, beginning with the XT6. The badge above kinda almost sorta represents the torque produced by the luxury crossover's 3.6-liter V6. That badge did not appear on the XT6 we photographed at the Detroit Auto Show. In U.S. parlance, twist in the XT6 comes to 271 pound-feet. Translated to Newton-meters, that's 367 Nm. Then round that up to the nearest 50, which Cadillac will do, and one arrives at 400. True, the rounding prevents a future of number jumbles like the 2020 XT6 367 vs. the 2021 XT6 419T. Nevertheless, we don't know why Cadillac is rounding to the nearest 50 instead of the nearest 25, since 50 Nm is about 37 lb-ft and could conceal a decent torque increase between model years. A "T" denotes turbocharging, and we imagine there'll be designations for hybrids and electric cars. We think most modern attempts at engine-based nomenclatures soon get as complicated as ciphers or come unmoored from their original scheme. And based on our experience with The Average Car Buyer, they don't care. A bigger number, no matter what that number represents, means more, which is the important thing. Because America, right? Maybe not. Carlisle said, "We're not talking about displacements any more," and the new badging will give consumers "a clear understanding of the power differences across the lineup." The brand believes torque provides a better comparison between ICE, hybrid, and EV powertrains and "the balance between fuel economy and performance." As for the immigrant unit of measurement, Carlisle told CNET, " It's metric, it's universal, it's global, we have to think about all the markets that we're doing business in." Oh, and, "Engineers certainly prefer Newton-meters." The new nomenclature will not be applied to V-series models or the Escalade, because the CEO holds that "special cars get special names." We should probably take a moment to reassure the CT and XT models that Steve Carlisle thinks you're all special, too. Just a different kind of special.