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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.

Refreshed GMC Terrain is introduced. Again.

Back in January of last year, we got our first look at the refreshed GMC Terrain that was supposed to go on sale sometime last fall as a 2021 model. But that was January 2020, just a couple of blissful months before the world shut down. So the Terrain ended up delayed, just like the Chevy Equinox, and now GMC is re-introducing us to the refreshed crossover, which is slated as the 2022 GMC Terrain. This time around, we've been shown photos of not just the new AT4 off-road oriented trim, but other more common variants. They all get larger grilles, larger headlights and new C-shaped taillights, and all trims get fulling LED exterior lighting. Both the AT4 and Denail get unique grille designs, with the former getting a gunmetal grey design with thick slats, and the latter getting an all-chrome one with more delicate lattice-work between the slats. The AT4 also boasts a front skid plate for protection, and from our early preview last year, it seems to get chunkier tires. The Elevation trim returns, too, as a black-out appearance package for the more entry-level SLE and SLT trims. The interior is mostly unchanged except for a revised shifter panel -- the buttons are new, but the same controversial design remains (see the video below). There are new features available, though. Apple CarPlay and Android Auto are still standard, but now they're wireless. A head-up display is available as an option for SLT and AT4, while it comes standard on the Denali. The Denali also gets an 8-inch screen in the instrument panel. Only the turbocharged 1.5-liter four-cylinder and nine-speed automatic have been announced for the Terrain. It makes the same 170 horsepower and 203 pound-feet of torque as before and can be paired with either front- or all-wheel drive. We're expecting a higher-horsepower, larger-displacement engine to be offered in the near future. The SLE, SLT and AT4 models will go on sale this summer. The Denali will follow in the fall. Pricing and additional details should be revealed in the coming months. Related Video:

GM faces possible class action lawsuit over 8-speed transmission

General Motors has been hit with a class-action lawsuit from owners who allege the eight-speed automatic transmission found in several rear-wheel-drive Chevrolet, Cadillac and GMC models between the 2015 and 2019 model years has a defect that causes the vehicles to hesitate and jerk when accelerating or slowing down. The lawsuit was posted to ClassAction.org and spotted by GM Authority. Problems with GM's Hydra-Matic 8L90 and 8L45 transmissions have been well-documented on Internet forums and via complaints filed with the National Highway Traffic Safety Administration, with many reporting damage to their vehicles. The lawsuit was first filed in December in U.S. District Court for the Southern District of Florida but appears to have been transferred recently to New York. Autoblog sought comment from Theodore Leopold, the lead attorney for the plaintiffs. "These transmissions have a common defect," the complaint reads. "Drivers attempting to accelerate or decelerate their cars feel a hesitation, followed by a significant shake, shudder, jerk, clunk, or 'hard shift' when the vehicle's automatic transmission changes gears." The problem also occurs when the vehicles accelerate in a single gear, without shifting, the plaintiffs allege. "Drivers have reported that the shift is sometimes so violent, they feel as though they have been hit by another vehicle." The problem is believed to center on the transmission, torque converter or both. The complaint says it causes undue friction, causing hydraulic systems and gears to function improperly and sometimes leaves metal shavings throughout the transmission, leading to costly repairs and replacement of parts or the entire transmission. It says GM has known about the problems since shortly after it introduced the transmissions, and has issued 13 technical service bulletins, none of which have resolved the problem. GM declined to comment on the lawsuit. The plaintiffs say GM should have warned consumers about the issues and covered repairs under each vehicle's three-year/36,000-mile bumper-to-bumper warranty. They're seeking statewide classes in at least six states: California, Florida, Illinois, New York, Oklahoma and Texas.