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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.

GM delays truck plant shift so workers can watch Detroit Lions NFC Championship game

It would be difficult to overstate just how big of a deal it is for the city of Detroit and its residents (and residents of southeast Michigan in general) that the Detroit Lions not only made it convincingly into the NFL playoffs but found significant success in defeating the Los Angeles Rams in the Wildcard round and then the Tampa Bay Buccaneers the following week. But if there's one thing we can point to as an automotive-minded group, it's this: General Motors has delayed the start of the third shift at its Flint Assembly plant so that workers won't have to miss any part of the game. To emphasize the magnitude of this decision, it's important to note that the Chevrolet Silverado HD and GMC Sierra HD are built at the plant, and the popularity and, perhaps more importantly, profitability of those heavy duty trucks is so high that it's the only GM plant in Michigan that runs a third shift, as pointed out by the Detroit Free Press. The delay is roughly an hour in total, and workers won't be paid for that missing time. We doubt there will be any complaints. Granted, this isn't the first time GM has delayed starting a late shift due to a big sporting event. In prior years, delays have been recorded for some Super Bowls and for the in-state Michigan vs. Michigan State rivalry game at GM facilities in Lansing, Michigan. Still, GM's statement on why it would hold off production of such a lucrative pair of vehicles explains it better than we can: "We recognize the Detroit Lions playing in the NFC Championship game as a rare, unique opportunity that warrants this temporary schedule adjustment to allow employees to enjoy the game and make it to work on time." It's not GM's only show of Lions pride. Take a close look at the General Motors logo currently being displayed at the Renaissance Center, GM's headquarters in Detroit. General Motors is displaying its Motor City pride with a subtle logo redesign to honor the Detroit Lions as they continues their Super Bowl hunt. Read more: https://t.co/Jmc6bmMK6n pic.twitter.com/9bJJqOmwxB — Ad Age (@adage) January 23, 2024 The Free Press reached out to Ford and Stellantis to see if either of GM's rivals would be making shift adjustments as well. Ford has yet to provide a comment, but Stellantis, makers of the Ram truck and Jeep SUVs, has confirmed it will be running normal schedules at all of its facilities. For now, there's only one more question that needs answering: What if the game goes to overtime?

GM might lose 90-year U.S. sales crown over chip shortage

Automotive News editor Nick Bunkley tweeted on October 1 that according to AutoNews data, General Motors "has been the largest seller of vehicles in the U.S. every year since passing Ford in 1931." With automakers having turned in light car and truck sales data for the first three quarters of 2021, GM's 90-year-run might not reach 91. According to AN figures, Toyota was 80,401 vehicles ahead when the October workday started. Worse, GM is so far behind its historic pace that it might only sell enough light vehicles in the U.S. to match its numbers from 1958.  Meanwhile, the New York Times put a few more salient numbers to the pain GM and Toyota are enduring alongside the the rest of the industry. GM sold 33% fewer cars in Q3 2021 than it did in Q3 2019 during the dark days of the pandemic, 446,997 units this year as opposed to 665,192 last year. GM's Q3 2020 was only down 13% on Q3 2019. Over at Toyota, the bottom line showed a 1% gain in Q3 2021 compared to 2020, with 566,005 units moved off dealer lots. The finer numbers show two steps forward and one step back, though; Toyota's September sales were down 22% compared to last year.  GM remains optimistic about what's ahead, GM's president of North American operations telling the NYT, "We look forward to a more stable operating environment through the fall." We'd like to see that happen, but we don't know how it happens. The chip shortage said to have been the inciting incident for the current woes isn't over, and not only can no one agree when it will be over, the automakers, chip producers, and U.S. government still can't get on the same page about who needs what and when. Looking away from that for a second shows articles about "No End In Sight" for supply chain disruptions in early September, before China had to start working through power supply constraints, global supply chain workers started warning of a "system collapse," and roughly 500,000 containers sat waiting to be unloaded at Southern California ports — a record number seemingly broken every week. And back to chips, we're told just a few days ago the chip shortage is "worse than we thought."   For now, the NYT wrote that GM dealer inventory is down 40% from June to roughly 129,000 vehicles, and down 84% from the days when dealers would cumulatively keep about 800,000 light vehicles in stock. However, GM just announced it would have almost all of its U.S. facilities back online next week, although some would run at partial capacity.