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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 Yukon spy shots show refresh with Acadia-style interior

GMC seems to be moving quickly to get its line-up's interiors all on the same page. These spy photos reveal that the GMC Yukon full-size SUV line will be getting an update that will refresh the exterior somewhat, and the interior much more significantly. The design of the interior is clearly derived that of the new Acadia. The center stack is dominated by one large vertical touchscreen, and sitting in the lower quarter of the screen is a floating multifunction knob. At the base of the screen are some chunky piano-key style buttons. They appear to be connected to some of the climate functions based on the screen's readout. On either side of the screen are vertical air vents, and we can just make out a bit of wood trim. Much of the rest of the dash is still hidden, but it's pretty clear this interior will look very close to that of the Acadia, as the screen and vent layout looks nearly identical. That means there should be an instrument cowl that extends just far enough to meet the center screen, and the rest of the dash should be fairly simple and unadorned. One other note, the steering wheel in this test vehicle has the lights and sensors for Super Cruise, so that will likely be offered, too. As for the exterior of the new Yukon, it won't be radically changed. While the Acadia and Terrain will be nearly all-new, the Yukon will just be a refresh with changes focused on the front and rear fascias. They're still very well covered in these spy shots, but expect some changes to grille shape and headlights to change somewhat. The example pictured appears to be an AT4 trim based on the shortened front bumper for improved approach angle. It also seems likely that the next AT4 will adopt the signature amber fender marker lights from the HD trucks, Canyon and now Acadia. Since this is a refresh, we wouldn't be surprised if we see the new Yukon shown sometime this year or early next. It will probably continue to offer the same range of engines and transmissions, including both gas V8s and the diesel inline-6. Related Video

General Motors Recall List

It seems General Motors can't go more than a few weeks without issuing a major recall. Since the initial ignition lock recall on February 10, over 25 million vehicles have been recalled for defects. It seems General Motors can't go more than a few weeks without issuing a major recall. Since the initial ignition lock recall on February 10, over 25 million vehicles have been recalled for defects. We used the National Highway Traffic Safety Administration recall list to compile a snapshot of all the GM vehicles recalled in the last two months. NHTSA also provides a search engine that allows owners to search for recalls on their vehicle. An automotive company must do everything in their power to notify its customers when a recall is issued on a vehicle. If you own any of the following vehicles and you have questions regarding your car, you can contact Chevrolet at 1-866-694-6546, GMC at 1-866-996-9463, Buick at 1-800-521-7300 and Cadillac at 1-866-982-2339. Or check out General Motor's recall site. Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153) or go to www.safercar.gov. Here's a brief summery of the other vehicles currently under recall: July 26 – 414,333 cars affected NHTSA Campaign Number: 14V447000 Models under recall: Certain model year 2011-2012 Buick LaCrosse, Regal and Chevrolet Camaro, as well as certain 2010-2012 Cadillac SRX, Chevrolet Equinox and GMC Terrain vehicles, equipped with power height adjustable driver and passenger seats. Problem: In the affected vehicles, the bolt that secures the driver's and passenger's power front seat height adjuster may fall out causing the seat to drop suddenly to the lowest vertical position. Consequence: If the driver's seat unexpectedly drops, the distraction and altered seat position may affect the drivers' control of the vehicle, increasing the risk of a crash. Solution: Dealers will replace the height adjuster shoulder bolts, free of charge. July 14 – 16,939 cars affected NHTSA Campaign Number: 14V341000 Models under recall: Certain model year 2011 Cadillac CTS vehicles manufactured October 18, 2010, to June 2, 2011. Problem: In the affected vehicles, vibrations from the drive shaft may cause the vehicle's roll over sensor to command the roof rail air bags to deploy. Consequence: If the roof rail air bags deploy unexpectedly, there is an increased risk of crash and injury to the occupants.