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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.

2021 GMC Canyon trims overhauled, SL and SLT disappear

Until this year, the GMC Canyon has offered six trims in two drivetrains: SL, a base model simply called Canyon, SLE, All Terrain, SLT, and Denali, with all but the SL available in either 2WD or 4WD. GM Authority credits "dealer sources" for news that the 2021 Canyon has had its trim steps overhauled. According to the chart in the report, the SL and SLT are no more, the base Canyon gets replaced by a trim called Elevation Standard, and SLE turns into Elevation. We already know that All Terrain has given way to AT4, while Denali remains in the top spot. Trim content doesn't change with the names, but there's no equivalent for the SLT trim in terms of spec. The GMC site lists the 2020 SLE and SLT on the same page, and a shopper must burrow into the spec comparison page to figure out the differences. The SLT only comes with the 3.6-liter V6 and eight-speed transmission, and makes features like remote start, climate control, heated mirrors, heated seats, hitch guidance, and a spare tire standard equipment. It also chromes the exterior door handles, and offers a Cocoa/Dune leather interior that can't be had on the SLE. It's possible the SLT's $4,700 premium over the SLE led more buyers to start with the SLE and add the engine and options they wanted.   We have a number of questions that we'll need to wait for GMC's official announcement to answer. The 2020 Canyon offers an Elevation Edition package for $650 that adds a black grille with body-colored surround, and 18-inch Satin Graphite wheels in all-terrain rubber. There's also a California Elevation Special Edition for $1,195 with all-weather floor liners, assist steps, and mud flaps. They could be optioned on the SLE but not the SLT. With the addition of two Elevation trims, we'll find out if the packages get renamed or go away. Separately, CarBuzz spotted a 2021 GM Fleet Order Guide that mentions a leveling kit option, LPO Code SQS, for the Canyon and the Chevrolet Colorado. We noted the inclusion of a leveling kit in the coming Canyon AT4 Off-Road Performance Package. According to the order guide, the option can be ordered only for the Canyon AT4 trim, but it's not clear if that's an a la carte choice or if buyers must order the Off-Road Performance Package. On the Chevy, the rake-removal equipment can be had with the Colorado 4x2 Z71 or the 4x4 Work Truck, LT, and Z71. Related Video:

Here’s how 20 popular EVs fared in cold-weather testing in Norway

Electric vehicles are known to suffer diminished performance in cold weather, but some do a better job than others hanging onto their range capacity while cabin heaters and frigid outdoor temperatures sap power from their batteries. Recently, the Norwegian Automobile Federation put the 20 of the best-selling battery-electric vehicles in the country to the test, to see not only how winter weather affected their range but also their charging times. The major findings: On average, electric vehicles lost 18.5% of their official driving range as determined by the European WLTP cycle. Electric vehicles also charge more slowly in cold temperatures. And interestingly, the researchers learned that EVs don’t simply shut down when they lose power but instead deliver a series of warnings to the driver, with driving comfort and speed levels maintained until the very last few miles. Because itÂ’s Norway, the worldÂ’s top market for electric and plug-in hybrid vehicles by market share, the test included many EVs that arenÂ’t available here in the U.S. But there are many familiar faces, among them the Nissan Leaf, Tesla Models S, 3 and X, Hyundai Kona (known here as the Kona Electric) and Ioniq, and Audi E-Tron. In terms of range, the top-performing EV was the Hyundai Kona, which lost only 9% of its official range, which the WTLP rated at 449 kilometers, or 279 miles, compared to its EPA-rated range of 258 miles on a full charge. It delivered 405 km, just enough to nudge it ahead of the Tesla Model 3, which returned 404 km. Other top performers included the Audi E-Tron, in both its 50 Quattro (13% lower range) and higher-powered 55 Quattro (14% lower) guises; the Hyundai Ioniq (10% lower); and Volkswagen e-Golf (11% lower). At 610 km (379 miles) the Tesla Model S has the longest WLTP range of all models tested and went the furthest, but still lost 23% of its range, though it also encountered energy-sapping heavy snow at the end of its test, when many cars had dropped out. The Model 3 lost 28% of its range. The worst performer? That goes to the Opel Ampera-e, better known stateside as the Chevrolet Bolt. It traveled 297 km (about 184 miles) in the test, which was nearly 30% lower than its stated WLTP range. We should also note that Opel, now owned by Groupe PSA, is phasing the car out in Europe and that Chevy recently upgraded the Bolt here in the U.S.