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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.

2022 GMC Yukon Review | AT4 and Denali make the strongest case

The total redesign of GM’s full-size SUVs for the last model year transformed every brandÂ’s version for the better, as the switch to an independent rear suspension resulted in the exact improvements weÂ’ve been wanting in terms of ride, handling, interior space and cargo capacity. Now in their second year of this generation, the 2022 GMC Yukon and Yukon XL continue to take advantage of these fantastic changes. Just as always, the GMC versions borrow heavily from their sister SUVs, the Chevrolet Tahoe and Suburban. The main differences lie in the exterior styling, and to a lesser extent, the interior. ThereÂ’s also the matter of price, as the Yukon is positioned in a slightly more premium space than the Chevy version of this truck. Most notable in this regard is the popular, top-of-the-line Denali, which has for the first time has an interior design that's different than other Yukons and every Tahoe. Despite this premium positioning, the Yukon is not prohibitively expensive, and it reasonably competes with other full-size SUVs like the Ford Expedition and Jeep Wagoneer. Which of the GM SUVs you choose is based almost entirely on looks and price, as the available feature set, engine lineup — we suggest the money-saving diesel — and drive options are nearly the same between them. ItÂ’s hard to go wrong, though, because just like last year, GMÂ’s full-size SUVs are our current leaders in the clubhouse as the ones to get. Interior & Technology   |   Passenger & Cargo Space   |   Performance & Fuel Economy What it's like to drive   |   Pricing & Features   |   Crash Ratings & Safety Features What's new for 2022? The most notable change for 2022 is a totally new infotainment system powered by Android Automotive. It brings new software and Google Maps as a native navigation system. Another tech enhancement is GMC swapping in its 12-inch digital instrument cluster (and making it standard) for the analog gauge cluster from last year. Lastly, the AT4 trim is now available with 6.2-liter V8 option. Note that GMC increased pricing for the Yukon mid-way through the 2022 model year. You may see differing prices online as a result, but those on this page are accurate as of May 31, 2022.  What are the Yukon interior and in-car technology like? The YukonÂ’s interior is an odd one, as there are two entirely different interior designs available depending on which trim you choose.

GM pauses 3.0-liter turbodiesel production due to a supplier shortage

General Motors confirmed it has temporarily stopped taking orders for trucks and SUVs equipped with the 3.0-liter Duramax turbodiesel six-cylinder engine. It blamed the last-minute pause on a supplier-related shortage. Website TFL Truck first reported the news, and a representative from General Motors quickly confirmed it. The spokesperson explained the issue is due to a "temporary part shortage" and added that production will resume "as soon as possible," meaning the Duramax engine (which is called LM2 internally) is not going away permanently. Additional details are not available, so we don't know if the issue is related to the ongoing chip shortage. Rather than delay deliveries and create a backlog, General Motors is reportedly asking its dealers to encourage buyers who want a turbodiesel engine to instead select either the 5.3-liter V8 or the 6.2-liter V8, depending on the model selected. Both are gasoline-powered units. There's no word yet on when Duramax production will resume. The shortage affects several models, including Chevrolet's Tahoe, Suburban, and Silverado 1500 and GMC's variants of these trucks. Cadillac's Escalade is temporarily diesel-less as well. Heavy Duty variants of the Silverado and the Sierra are not affected because they're powered by a different Duramax engine with eight cylinders. Motorists seeking a full-size SUV powered by an efficient turbodiesel engine are temporarily out of options because the Tahoe/Yukon and the Suburban/Yukon XL had the segment to themselves. The Duramax was surprisingly popular, too: in May 2021, GM Authority reported that the turbodiesel straight-six represented 8% of Suburban sales and 6% of Tahoe sales. Installed in a rear-wheel-drive Tahoe, the engine returns 21 mpg in the city, 28 mpg on the highway, and 24 mpg in a combined cycle, figures that make the body-on-frame behemoth more efficient than the unibody, front-wheel-drive Chevrolet Blazer that's 20 inches shorter and approximately 1,700 pounds lighter. Related video: 2021 Chevrolet Tahoe 3.0L Duramax engine