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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.

GMC moved the headlights down on the 2024 Sierra EV to prevent glare

There are a lot of things that are different between the 2024 GMC Sierra EV’s design and the gasoline Sierra pickup, but one we noticed right away was the headlight placement. On GMÂ’s full-size gasoline trucks, the headlights are about as far up the front fascia as they can be. In the Sierra EV, theyÂ’re positioned significantly further down and into the lower bumper below the grille. Why are we highlighting this particular aspect of the design? Well, unless you only ever drive massive, high-riding trucks, youÂ’re probably very accustomed to being frequently blinded by them on the road these days. In describing the Sierra EVÂ’s headlight placement, designers told us they intentionally put the lights further down to improve matters. We pulled Phil Kucera, a GMC design manager, aside to ask him about the change. “It tends to be a better spot where itÂ’s not glaring in other peopleÂ’s eyes, right, the lower you get,” Kucera says. Beyond blinding others, putting the headlights lower on the face of the truck improves headlight performance for the driver, too. “Typically the lower the better, because thatÂ’s where theyÂ’re going to be on the road, so thereÂ’s less to reflect off of in fog or rain,” Kucera explained. “If you get them up at a certain height, theyÂ’re going to be reflecting certain things like snow, rain or things like that in your eyes.” 2024 GMC Sierra EV Denali Edition 1 View 13 Photos Of course, youÂ’ll notice on the Sierra EV that the daytime running lights (DRLs) are still big and bold in the upper part of the front end. These lights are around for decor, though, and act as pieces of design rather than a functional way to see at night. In other words, theyÂ’re lights, but theyÂ’re not going to dazzle oncoming traffic or cause glare for the driver like a headlight pointed down the road will.  Moving those lights further down in the front should hopefully be a net positive for other drivers coming across the Sierra EV and for drivers of the truck themselves. How the lights are aimed plays just as much a role in how other drivers perceive oncoming lights, though, so weÂ’ll have to wait and see the real-world performance on this one.  WeÂ’ll also note that moving the actual headlights further down the front end doesnÂ’t take anything away from the design of the Sierra EV. It still features a strong, upright stance that the world is accustomed to seeing from new trucks these days. ItÂ’s no surprise, but GM agrees.

Ultra-luxury land yachts from Cadillac and Rolls-Royce | Autoblog Podcast #752

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by News Editor Joel Stocksdale. In this week's news, we about a pair of ultra-luxury electric cars, the 2024 Cadillac Celestiq and Rolls-Royce Spectre. We also cover the 2024 GMC Sierra EV and 2024 Chevy Trax, plus some of the reveals from the Paris Motor Show. The show is capped off with a discussion about the electric cars Greg Migliore has driven for the North American Car and Truck of the Year Awards: the Rivian R1S SUV and Lordstown Motors Endurance pickup truck. Send us your questions for the Mailbag and Spend My Money at: Podcast@Autoblog.com. Autoblog Podcast #752 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 2024 Cadillac Celestiq 2024 Rolls-Royce Spectre 2024 GMC Sierra EV 2024 Chevy Trax Paris Motor Show: Jeep Avenger EV Cars we're driving 2023 Rivian R1S 2023 Lordstown Motors Endurance 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: