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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 recalls 668,000 SUVs due to faulty anchor bars for child seats

DETROIT — General Motors is recalling more than 668,000 small SUVs in the U.S. because owners may not be able to hook child seats to the anchors. The recall covers certain 2020 to 2023 Chevrolet Equinox and GMC Terrain SUVs. The National Highway Traffic Safety Administration says in documents posted on its website Thursday that the rear-seat lower anchor bars may have had too much powder coating. That could make them too thick and prevent a child seat from being installed. GM says no crashes or injuries have been reported. The automaker is asking owners to install child seats using the seatbelts until the latches are repaired. Dealers will inspect the anchors and replace the finish if necessary. Owners will be notified by letter starting June 26.   Recalls Chevrolet GM GMC SUV child safety car seat

Autoblog Garage Video: 2023 GMC Sierra AT4X is a rugged and refined truck

In this episode of Autoblog Garage, we take a tour of the 2023 GMC Sierra 1500 AT4X. This big beast of a truck isn't just a bruiser, with its 6.2-liter V8 and 33-inch mud-terrain tires. It's got a soft side — inside. After the Sierra's refresh for 2022, it gets better interiors to help differentiate it from its Chevy Silverado cousin, and the AT4X's cabin is about as nice as the exterior is tough. Despite its size and off-road intentions, the AT4X still makes for a comfortable daily driver, especially in the middle of a Michigan ice storm. Join us as we take a walk around the AT4X, from its rugged exterior and trick tailgate to its cozy, tech-filled interior and potent powertrain. Get a close look at its features, and learn more about details from specs to pricing in the video above. Come back on Wednesdays for more videos from the Autoblog Garage. Disclaimer: Autoblog accepts vehicle loans from auto manufacturers with a tank of gas and sometimes insurance for the purpose of evaluation and editorial content. Like most of the auto news industry, we also sometimes accept travel, lodging and event access for vehicle drive and news coverage opportunities. Our opinions and criticism remain our own — we do not accept sponsored editorial.