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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.

2015 Chevrolet Corvette Z06

"Corvette" has stood for American muscle, American sports car, and American supercar. In many cases, it still stands for America: liberty on the go, LS-powered freedom. There was also a time when it meant really impressive numbers that didn't equate to really impressive handling, and a not-so-nice cabin. The handling issue really turned the road-legal corner when the C5 Z06 was introduced in 2001, and by the time the super-duper ZR1 ended its run in 2010, Corvette had exorcised practically all of its dynamic demons. But when I took a seat in the 2015 Corvette Z06 on the first day of my week-long loan, I espied a few demons still squatting in the interior. When colleague Seyth Miersma drove the Z06, he wrote, "Listen, I'm not going to be the guy that dogs the Corvette for having a cheap-feeling interior, this generation has put those once-legitimate claims to rest." Well, I am going to be that guy, because I don't think those claims have been put to rest. One day Chevy will give us leather that looks and feels like leather, instead of the astonishingly thin hide that is laid directly on top of the instrument panel structure. This material was set off by white stitching, but there were no seams, just a trail of white stitches. In some places it was hard to tell where the leather ended and the plastic began; or it might all have been the same upholstery, I don't know. Five dollars of foam padding would add five thousand dollars of luxury to the cockpit. One day Corvette will have plastics that don't look so plasticky. I know General Motors can do it. And after years of thinking Corvette seats were too wide and flat, this latest Z06 is almost there. The seatbacks were nice, but the exaggerated side bolstering on the seat bottoms was too narrow and sharp. That's a personal preference, though; other drivers with thinner thighs will think differently. My complaint isn't that the interior isn't luxurious, it's that it's not luxurious enough. If Chevrolet was worried about pricing, it could add some kind of profligate package to the options list. Have some ex-Porsche people design it, call it the Teutonic Splendor Package, slap a massive price on it, and count the money. People will buy it, and no one will ever have to say again, "But the interior..." That said, this test car's cabin had every feature I wanted. The gauge cluster was bright, crisp, and readable in every shade of daylight.

Ford F-150 Raptor R, Kia Telluride and SEMA highlights | Autoblog Podcast #754

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Senior Editor, Green, John Beltz Snyder and Associate Editor Byron Hurd. Byron has been sending the 2023 Ford F-150 Raptor R on the sand dunes of Lake Michigan. John has been off-roading in the updated 2023 Kia Telluride. Greg has been spending time in the Toyota Tacoma TRD Pro, Chevy Traverse High Country and Volvo V60 Cross Country. Next, they talk about the news, include SEMA highlights and the reveal of the 2023 Ford Transit Trail. Finally, they reach into the mailbag and discuss the Cadillac Celestiq's design. Send us your questions for the Mailbag and Spend My Money at: Podcast@Autoblog.com. Autoblog Podcast #754 Get The Podcast Apple Podcasts – Subscribe to the Autoblog Podcast in iTunes Spotify – Subscribe to the Autoblog Podcast on Spotify RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Cars we're driving Ford F-150 Raptor R Kia Telluride Toyota Tacoma Chevy Traverse High Country Volvo V60 Cross Country 2023 SEMA Show highlights 2023 Ford Transit Trail revealed Mailbag: Cadillac Celestiq Feedback Email – Podcast@Autoblog.com Review the show on Apple Podcasts Autoblog is now live on your smart speakers and voice assistants with the audio Autoblog Daily Digest. Say “Hey Google, play the news from Autoblog” or "Alexa, open Autoblog" to get your favorite car website in audio form every day. A narrator will take you through the biggest stories or break down one of our comprehensive test drives. Related video: