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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.

Chevy to resume engine-building program for 2015 Corvette Z06

One of Chevrolet's most popular and unique customer features is set to return for 2015, as the company has announced that the Engine Build Experience is back. Interested owners will be able to screw together their engines beginning in March. The $5,000 option (which does not include the cost of travel) will give future owners of the 2015 Corvette Z06 the chance to screw together their car's actual 6.2-liter, supercharged V8. Available on each of the Z06's three trims, the Engine Build Experience includes a day at the Performance Build Center, instruction from an engine assembly tech, photographs of the experience and a personalized engine plaque. Once the build process is completed, the engine will (eventually) be fitted under the hood of the customer's personal Z06. "Chevrolet recognizes the passion customers have for Corvette and the Engine Build Experience offers them a truly unique opportunity for hands-on involvement in the creation of the heart of their new car," Corvette product manager Harlan Charles. "It's important for customers to understand their engine won't be installed the day after they built it. It will flow into the scheduling process for vehicle assembly, which depends on a number of logistical variables." Scroll down for the official announcement of the Z06's Engine Build Experience, available below. Exclusive Corvette Engine Build Experience Returns Program renewed for supercharged LT4 engine at new Bowling Green build center 2015-01-07 BOWLING GREEN, Ky. – Chevrolet announced today it is resuming the exclusive Engine Build Experience for Corvette Z06 customers – the only program of its kind for supercar customers. Starting in March 2015, Corvette Z06 customers will be able to assemble the 650-hp supercharged LT4 engine for their cars at the new Performance Build Center inside the Bowling Green Assembly Plant. "Chevrolet recognizes the passion customers have for Corvette and the Engine Build Experience offers them a truly unique opportunity for hands-on involvement in the creation of the heart of their new car," said Harlan Charles, Corvette product manager. "It's a chance to bond with their new car." The Engine Build Experience is selected with order code PBC and is offered on all Z06 trim levels.

2023 J.D. Power Initial Quality Study shows there's less quality than last year

Vehicle inventory, vehicle pricing, and the supply chain are finally showing improvement. Vehicle quality, on the other hand, is still going the wrong way. That's the takeaway from the 2023 J.D. Power Initial Quality Study that found overall problems exceeded last year's record high. The study surveyed owners of 2022-model-year vehicles to assess the average rate of problems per 100 vehicles (PP100) during the first 90 days of ownership. The average figure for the 32 ranked manufacturers in 2020 was about 166 problems per 100 vehicles. In the 2021 IQS, that dropped to an average of 162. For 2022, the average jumped to 180 problems. For 2023, the PP100 is up to an industry average of 192 — an increase of 30 problems per 100 vehicles in just two years. Let's get to the good news first: Dodge reclaimed the crown of having the lowest number of problems per 100 vehicles at 140. Buick won last year with 139 PP100, falling to third this year. Dodge was the first American automaker to top the IQS in 2021. Its return as the least problematic gives parent company Stellantis three wins in four years after Ram was crowned in 2021. It also gives U.S. brands a four-peat after Buick topped the chart in 2022 by having owners report the fewest problems. This year's top 10 is Dodge, Ram, Alfa Romeo, Buick, Chevrolet, GMC, Porsche, Cadillac, Kia, and Lexus. Stellantis gathered a few feathers for its cap, in fact. Maserati showed the largest improvement year-on-year, followed by Alfa Romeo, and Alfa Romeo posted the lowest PP100 among the premium class, beating Porsche and Cadillac. Alfa Romeo has been vocal about working to improve quality, mentioning Lexus as a target. Last year the Japanese brand finished sixth, the Italians finished near the bottom, between Jaguar and Mitsubishi. This year Alfa jumped to third, Lexus dropped to tenth. Ram was the third-best on the list of improvers from 2022 to 2023.   The individual model with the lowest PP100 is the Nissan Maxima. Now for the troublesome bits. In the words of Frank Hanley, senior director of auto benchmarking at J.D. Power, "The industry is at a major crossroad and the path each manufacturer chooses is paramount for its future.