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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 says not to look at the 2019 Silverado's fuel economy rating

The 2019 Chevy Silverado is hitting dealerships soon, and one of the most notable changes for the new full-size pickup is the addition of a 2.7-liter turbocharged inline-four. The engine replaces the naturally-aspirated 4.3-liter V6 in volume consumer models like the Silverado LT and promises more power, less weight and — most importantly — better fuel economy. The thing is, the gains in efficiency haven't been as dramatic as some might have hoped, especially when stacked up against competitors from Ford and Ram. As Automotive News reports, GM's response is a little murky. First, let's talk numbers. We're pulling all figures from FuelEconomy.gov, the official U.S. government source for fuel ratings. Fuel economy numbers on trucks vary greatly based on a number of factors. Bed and cab configuration play a part, but so does a four-wheel-drive system. You also have to factor in tires, transmissions, rear-axle gearing, hybrid systems and cylinder deactivation. Things like that can make the difference between best- and worst-in-class. The EPA's website doesn't give enough information a lot of the time, so there's really no easy way to compare apples-to-apples. First, take a look at the ratings for the 2019 Silverado. A 2.7-liter model with two-wheel drive is rated 20 city, 23 highway and 21 combined. That's both better and worse than a two-wheel drive 2018 Silverado with the 4.3-liter V6 (18 city, 24 highway and 20 combined). The updated 2019 Silverado with a 4.3-liter V6 has yet to be rated. With less weight and a smaller engine, many hoped Chevy would make bigger gains. It's unusual to see any decrease in a fuel economy metric these days. GM says that it's not done tuning the new 2.7-liter engine, so fuel economy could theoretically increase. Expanding further, a V8-powered 2019 Silverado (17 city, 24 highway and 19 combined) actually gets better highway fuel economy than a turbocharged four-cylinder powered truck in certain configurations, even if the latter has a better overall average. But that's only with two-wheel drive, the 8-speed transmission and cylinder deactivation. A Silverado with the 5.3-liter V8 and a 6-speed automatic is rated at 15 city, 22 highway and 17 combined. The biggest issue with the Silverado 2.7-liter doesn't come from within GM itself but from Ford and Ram. GM cites the Ford F-150 with the 3.3-liter V6 and the Ram 1500 with the 3.6-liter V6 as the closest competitors to its new 2.7-liter inline-four.

GM global sales off slightly this year

General Motors saw a slight dip in global sales through the first nine months of the year. In that time, the automaker moved 7.2 million vehicles – down 1.3 percent from 2014. For the third quarter alone, the numbers were down 3.1 percent with a worldwide volume of 2.3 million. The automaker had a better performance in North America, as Chevrolet is showing strength with some of its best crossover sales ever, and pickup trucks were up 16 percent for the year. Volume on the continent advanced 4.9 percent through September to nearly 2.7 million vehicles. The third quarter improved that figure even further with a 5.2-percent jump and deliveries of about 931,000. Elsewhere in the world, things were more mixed in the third quarter. European deliveries jumped 1.1 percent, but the company was still down 6.3 percent there for the year so far. Volume in China also fell 4.2 percent, but the country showed 1.6-percent growth through the first nine months. South America took the biggest, hit with Q3 numbers dropping 30.8 percent. While GM is seeing a small sales drop globally, the company could still climb up the ranking of the world's largest automakers by the end of the year. Volkswagen had the top spot in the first half of 2015, but since then, the German company has been rocked by an international emissions scandal. GM Sold 7.2 Million Vehicles in the First Nine Months of 2015 DETROIT – General Motors Co. (NYSE: GM) sold 7.2 million vehicles globally in the first nine months of 2015. The company posted sales increases in four of its five largest markets, with record sales in China and strong retail sales gains in the United States. Total sales were down 1 percent, due primarily to the company's previously announced decisions to strategically reduce its presence in certain markets, as well as difficult market conditions in South America. "Our unwavering focus on the customer is paying off in our largest and most important markets as we execute one successful launch after another in the right segments," said GM President Dan Ammann. "At the same time, we have reacted quickly to challenging macroeconomic environments in other markets and have shown the discipline to exit situations where we see no long-term path to acceptable returns." Examples of GM's recent success include: GM truck sales in North America were up 16 percent in the first nine months of 2015, driven by a 17 percent increase in Chevrolet truck deliveries in the United States.