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GM diesel pickups first to undergo extra EPA, CARB testing

The effects of Volkswagen's long-running diesel emissions evasion are starting to spill over to other automakers, but General Motors is taking things in stride. The 2.8-liter, four-cylinder Duramax in the 2016 Chevrolet Colorado and GMC Canyon is the first engine to get extra scrutiny by the Environmental Protection Agency and the California Air Resources Board, Automotive News reports. Rather than just the usual in-lab test, it's also being checked on the road. However, the extra evaluation shouldn't have any impact on when the trucks with his mill hit dealers later this fall. "We're in our final stages of the EPA certification, and our launch is on track," Chevy spokesperson Otie McKinley tells Autoblog. The four-cylinder diesel in the trucks makes 181 horsepower and 369 pound-feet of torque, and the automaker is touting low NOx production. In the announcement for the Colorado's specs, the company calls it "the cleanest diesel truck engine ever produced by General Motors." The tech includes exhaust gas recirculation to lower combustion temperatures and improve emissions. There's also a urea tank like on the bigger diesels for full-size trucks, and it gets refilled in time with oil changes. An indication on the instrument panel lets drivers know when that's needed, too. Even with the more demanding testing, the company doesn't seem too worried about the four-cylinder passing. "Part of our development process is on-road and off-road [laboratory] testing," Scott Yackley, Chevy Trucks assistant chief engineer, said to Automotive News. In the wake of the VW scandal, the EPA has pledged more rigorous testing. Before, on-road emissions evaluations were largely limited to heavy-duty vehicles, but the agency has decided to apply the checks more often to other models. There's also now greater cooperation with Canadian authorities.

GM opens official investigation into C8 Corvette transmission leaks

In March 2020, a month after Chevrolet began customer deliveries of the 2020 C8 Corvette, a GM dealer technician created a Reddit thread about a leaking gearbox in a Corvette with 32 miles. That car hadn't even been sold yet. Since then, as a search of "C8 Corvette transmission leak" shows, it's been tales of woe for some owners. Something in the Tremec TR-9080 transaxle in the back of the mid-engined Corvette doesn't work as it should, the fault able to cause codes that the transmission needs service, or that the driver needs to shift to park. In some cases, the battery would die because of follow-on issues after the initial transmission code, that code preventing the car from powering down. As Autoevolution reports, GM filed paperwork with the National Highway Traffic Safety Administration in August to look into what's going on. Between forum threads and GM's investigation document, there are several issues mentioned. The most common appears to be the dual-clutch transmission leaking fluid due to gasket failures like the one suffered by one owner at 858 miles, and another for an owner currently enduring a second leaking transmission. The Midengined Corvette Forum reported that Chevy engineers redesigned the TR-9080 pan, fitting Corvettes with the new unit at some point in the 2021 model year. The original pan was stamped steel unit affixed to the engine with two studs and 13 bolts, plus "reinforcement plates." The updated pan is said to be a cast aluminum unit affixed with two studs and 17 bolts, omits the reinforcement plates, and gets a new machined new groove around its edge to seat the gasket seal. The GM paperwork now at the NHTSA mentions a P1789 code, and says one reason for it could be "debris on the park position sensor magnet causing an incorrect position reading to the TCM." This might be caused by another issue mentioned in forums, which is clogged transmission filters. GM gives instructions for returning transmission filters to the company, and a poster on one forum said the Corvette tech at the dealer where he bought his Corvette told him the automaker "requires every used transmission filter to be returned to GM."  Whatever's going on, the problems haven't stopped, and they go beyond the P1789 code. Over the weekend, a 2022 Corvette owner posted on Corvette Forums that he got a check engine light on his car after just 850 miles.

2022 GMC Sierra 1500 Denali gets Super Cruise and an upgraded interior

The 2022 GMC Sierra 1500 is getting Super Cruise! Exclamation point required, because this is exciting news. Cadillac has been the sole owner of Super Cruise at GM from the start, and though we knew it was coming to the Hummer EV, we didn't know a fast-selling full-size pickup would be getting the technology. GMC says it will launch Super Cruise on the 1500 Denali, which is the most expensive and luxurious trim of the Sierra. It’s scheduled to arrive for the 2022 model year, but GMC qualifies that by saying “late model year 2022.” That means itÂ’s probably coming right toward the end, with 2023 scheduled as the first full year of Super Cruise in the Sierra 1500. GM also claims that the version of Super Cruise coming to the Sierra is capable of towing. Yes, hands-free towing, folks. WeÂ’re a little antsy, too. The tech is the same as the newest generation of Super Cruise coming in the Cadillac CT5 and CT4. ItÂ’s an improved version with more capability than the first-gen system that won AutoblogÂ’s Technology of the Year award a couple of years ago. Questions still remain to be answered, though. GM hasnÂ’t said anything about what it will cost on the Sierra 1500. WeÂ’re also left in the dark when it comes to other Sierra 1500 trim levels; and what about the Silverado 1500? It makes sense that GM would give the Sierra Super Cruise first, but itÂ’s certainly compatible with the Chevy version of the truck now, too. As for other GMC products, GM is quiet on when theyÂ’ll be blessed with Super Cruise. The redesigned Yukon would be the most obvious candidate being the flagship product, but GM says the program timing worked out best to launch on the 2022 Sierra, not the Yukon. ItÂ’s likely that the SUV will be updated with the system in the near future. Besides Super Cruise, GMCÂ’s photo also reveals that the 2022 Sierra is getting a fully digital instrument cluster. ItÂ’s surely an optional item, but could very well be standard on Denali. GM has flipped the speedometer and tachometer to opposite sides, but their digital versions still have that straight-edged GMC look to them. You can see the Super Cruise graphic in the center, and all the gauges are dropped down to the bottom of the display. But wait, thereÂ’s more. The photo also shows the beginnings of a totally new interior design, different from both the current Sierra, standard Yukon and Yukon Denali interiors. ItÂ’s immediately and obviously different everywhere we look.