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GM issues stop-sale for 3 SUVs over incorrect MPG rating

This week, GM sent a memo to Chevy, GMC, and Buick dealers to tell them to stop selling three SUVS. The 2016 Chevy Traverse, the GMC Acadia, and the Buick Enclave all have EPA window stickers that show higher fuel economy ratings than the vehicles actually have. Unlike other recent – and very public – fuel economy ratings problems from VW and Mitsubishi, it doesn't seem like GM did anything wrong with the testing for these vehicles, it just misprinted the labels. New labels are being printed and should arrive at dealerships this weekend and early next week. After that, the SUVs will be able to be sold and delivered again. The official fuel economy rating for the three SUVs are all the same. The correct numbers for the all-wheel drive versions are 17 miles per gallon combined, 15 city, and 22 highway. The stickers say the SUVs get 17/24/19. The front-wheel driver models were also incorrectly labeled, and the total number of affected vehicles is 59,823. In the memo, GM said the problem was caused by an "inadvertent error," Automotive News says. GM is working with the EPA to solve the issue. We have asked GM for a comment on the mistake and will update this post if we hear back. Related Gallery 2013 GMC Acadia View 16 Photos News Source: Automotive News – sub. req. Government/Legal Green Buick Chevrolet GM GMC Fuel Efficiency mpg gmc acadia chevy traverse

GM exploring ways to raise half-ton Duramax diesel tow rating

Lots of truck owners cheered when GM announced fuel economy numbers for the 2020 Chevrolet Silverado with the 3.0-liter Duramax diesel inline-six. Even after Ram let loose its EPA mileage ratings for the 2020 Ram 1500 EcoDiesel, the Chevy oil-burner still took the trophy. The victory was years in the making, GM engineers spending an entire four-year development cycle refining the LM2 Duramax to increase mileage. The tradeoff, as well all know by now, is towing; the Duramax in half-ton duty pulls a maximum 9,300 pounds in the Silverado. Rivals across town can do more, the Ford F-150 PowerStroke rated at 11,500, the Ram 1500 EcoDiesel game to pull 12,560. GM engineer John Barta told Muscle Cars & Trucks that more hauling chops could be on the way, explaining, "We’re actually looking at upgrading some of the materials around (the engine bay) to see if we can maybe raise our tow rating." Engine bay materials are at issue due to thermal complexities underhood. John Barta, GM's assistant chief engineer of diesel engine controls, said the Duramax's inline-six configuration allowed engineers to get emissions hardware like the combined selective catalytic reduction, diesel oxidation catalysts, and diesel particulate filter unit closer to the engine, where it heats up quicker, getting emissions down quicker. But that filter puts another heat source in those confines, enforcing a cap on the tow rating to keep the engine and other systems from overheating. "If you look under the hood," he said, "youÂ’ll see a significant amount of silver ‘moon tapeÂ’ around to make sure things arenÂ’t getting overheatedÂ… if we were to go up in higher towing, which we can, we start impacting the possibility of deteriorating some of the components.” There isn't much space for more grille, so swapping for a better grade of "moon tape" or a different kind of material could reduce engine bay heat, extracting a higher tow rating in the process.  It's important to note a point Barta's been making for months about the Duramax figures, though. "Even though itÂ’s nice to brag about big numbers, in reality, light duty customers are not towing that large with their trucks," and, "We do know that (95 percent) of our light duty customers donÂ’t tow over 9,000 pounds." On our First Drive of the 2020 Silverado diesel we called out the tow rating, but emphasized that the Chevy and GMC have more important challenges to overcome.

2015 Chevy Volt will be available with 4G LTE

General Motors teased consumers two years ago when it showed off a Chevrolet Volt decked out with 4G LTE connectivity. More details were finally unveiled this month at the Consumer Electronics Show in Las Vegas: the 2015 Chevy Volt will have a 4G LTE option and will offer consumers an as-yet-unpriced option with much faster wireless internet connection and more smartphone apps. GM's OnStar has teamed up with AT&T to come up with several mobile apps alongside the roadside assistance. The Volt joins the 2015 Corvette, Impala and Malibuz models that will debut with a 4G LTE option this year. The first four 4G ChevroLTE models will be released this summer and will be joined by the Spark (EV and gas versions), Equinox, Silverado and Silverado HD. GM has yet to announce whether any Cadillac or Buick models will get the 4G option. Chevrolet Accelerates to 4G LTE Speeds in 2014 Bowtie brand models in U.S. and Canada to get OnStar 4G LTE by summer LAS VEGAS – Starting this summer, Chevrolet will have some of the fastest vehicles on the roads, and that has nothing to do with horsepower. Chevrolet drivers will be enjoying high-speed data - made possible by a new OnStar 4G LTE connection in the vehicle, running on AT&T's network, the nation's fastest and most reliable 4G LTE network. Chevrolet today announced at the Consumer Electronics Show that the 2015 Chevrolet Corvette, Impala, Malibu, and Volt would be the first General Motors' vehicles to come optionally equipped with OnStar 4G LTE. They will be followed by the Equinox, Silverado, Silverado HD, Spark and Spark EV. In the Canadian market, OnStar with 4G LTE will be introduced on the Chevrolet Trax as well. The majority of the 2015 Chevrolet lineup in the U.S and Canada will have a 4G LTE connection built-in at vehicle launch. More models will be announced later this year. "Chevrolet is expected to implement the broadest deployment of 4G LTE in the automotive industry," said Alan Batey, senior vice president of Global Chevrolet. "The fact that OnStar with 4G LTE will be available in models that range from the Chevrolet Spark to the Silverado to the Corvette, is indicative of our broad commitment to deliver more value and convenience through smart technology applications.