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GMC teases rugged 2021 Canyon AT4 pickup

GMC promised every model in its lineup would get the AT4 treatment by 2021. Having introduced AT4 versions of the Sierra, Acadia and Sierra HD already, that leaves the Canyon, Terrain and Yukon waiting their turn for the procedure. During a press even for the Sierra HD in Jackson Hole, Wyoming, GMC teased Canyon AT4 as next in line to receive upgraded off-road chops. The automaker had a camo'ed prototype Canyon AT4 in a trailer hooked up to a Sierra HD. When Sierra occupants pulled up the feed from the trailer-mounted camera on the infotainment screen, said occupants got a view of the masked midsize pickup between two walls reading, "The first ever Canyon AT4" and "Coming early 2020." The main mysteries are how extensive the pickup's AT4 transformation will be, and when it will go on sale. The AT4 kit changes depending on model. The Sierra AT4 upgraded performance and looks, with features like a two-speed transfer case, locking rear differential, a two-inch lift and Rancho monotube shock absorbers, skid plating, black-chrome grille and body-colored grill surround. The 2020 Acadia AT4 is mostly about looks, pairing standard all-wheel drive with black trim and wheels, and all-terrain tires. The Canyon's expected to weigh in on the Sierra end of the overhaul, and slide into the lineup between the SLT and top-tier Denali trims. The mods will put it beyond the current All Terrain trim being phased out across the lineup, but leave space between the Canyon AT4 and its Chevrolet sibling, the Colorado ZR2. GMC VP Duncan Aldred said, "They’re going to have different capability levels. The ZR2 is extreme capability. AT4 isnÂ’t positioned as extremeÂ… not intended to rival the ZR2." And the Colorado gets the even chunkier Bison version on top of that. The Canyon AT4 is predicted to join the lineup for the 2021 model year, so although it's "coming early 2020," it might not go on sale until much later in the year. GM's midsized pickup twins will be endowed with changes so mild that neither brand will classify the work with the term "midcycle enhancement." Figure a refining around the grille and lights and a few minor fillips otherwise. Next-generation models of the Canyon and Colorado aren't due until 2023, and there's apparently debate inside GM about an interior refresh for both trucks before then. The Terrain should mirror changes to the Acadia, and it would be a pleasant surprise to see the all-new Yukon also due in early 2020 get serious off-road teeth.

GM under fire from safety advocates over braking problem caused by recall fix

Safety experts are lambasting General Motors over what they say is the automaker’s slow notification of owners of certain 2019 sedans and trucks that a recall fix could cause power braking to fail and increase the risk of a crash, the Detroit Free Press reports.  GMÂ’s original recall in December targeted about 550,000 Cadillac CT6 sedans and Chevrolet Silverado 1500 and GMC Sierra 1500 pickups, all from the 2019 model year, over potentially defective electronic stability control and antilock brakes. In that case, GM said the errors would not show up as a diagnostic warning on the instrument cluster. But after GM had done recall work on 162,000 vehicles, about 1,700 owner have complained that their power brakes didnÂ’t work after they had the recall done and then used the OnStar app to start their vehicle. GM then issued a supplemental fix for customers whoÂ’d already had their vehicles serviced. In this case, a diagnostic warning should illuminate saying either “Service Brake Assist” or “Service ECS,” which GM says is a signal that a customer should not drive the vehicle and instead call their dealer, which will tow the vehicle and have it repaired. Safety advocates say the automaker hasnÂ’t gone far enough to protect customers. “The fact that you could potentially start a vehicle and not have brakes is a pretty risky proposition,” Sean Kane, president of the Safety Research and Strategies, which works on auto issues for plaintiffs and governmental organizations, told the Freep. “The fact that they wouldnÂ’t notify owners (sooner) is pretty stunning.” GM told the Freep it was required to notify the National Highway Traffic Safety Administration and file paperwork before it notified customers about the original recall, which was made Dec. 12. It then had to investigate and resolve the problem created by its original recall fix before alerting customers. GMÂ’s call center and dealers are contacting the remaining 900 customers who havenÂ’t yet had the update made to the original recall repair. GM also hired a vendor to send recall letters to the 550,000 customers affected by the original recall notifying them about the update. There are no known injuries or deaths related to the problem. Read the Freep story here.

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.