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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.

Engine block heater issues force GM to recall 324,226 diesel heavy duty trucks

General Motors has issued a recall on 324,226 diesel heavy duty trucks that could be susceptible to short circuits, and consequently, potential fire. The recall affects several models of heavy duty Chevrolet Silverados and GMC Sierras with optional engine block heaters. GM is recalling seven different truck models spread across three years. The recall affects the 2017-2019 Chevrolet Silverado 2500HD, 2017-2019 Silverado 3500HD, 2019 Silverado 4500HD, 2019 Silverado 5500HD, and 2019 Silverado 6500HD, plus the 2017-2019 GMC Sierra 2500HD and 2017-2019 Sierra 3500HD. Specifically, it includes these models with the 6.6-liter Duramax diesel engines and the optional engine block heater. The recall technically deals not with the engine block heater itself, but the way it is connected. According to NHTSA campaign No. 19V328000, the engine block heater cord or the terminals that link the cord to the heater could short circuit. A short circuit could potentially damage engine components and result in a fire. According to The Detroit News, 19 fires have been reported but nobody has been injured. GM has yet to figure out a fix, and thus has not yet released a notification schedule for affected customers. If you believe your vehicle is part of the recall, contact GM customer service at 1-586-596-1733 and use reference number N182206310.

Most of the US won't get 2016 Chevy Volt

Every major plug-in vehicle launch in the US has been a patchwork operation, with automakers focusing their initial efforts on targeted locations like California where they expect to sell the most units. Today, we learned that even five years into the plug-in car project, the game remains the same. According to GM, the second-gen Chevy Volt is going to be rolled out in the same manner. In fact, GM is limiting availability of the 2016 model year Volt so much that most of the US will not have access to the car at all. For 39 states, the second-gen Volt will first be available as a 2017 model year vehicle at some point in the spring of 2016. When GM announced the buying process for the new Volt, it made it clear that dealers in California would be the first to place their orders. Hybrid Cars now reports that the first deliveries will be also limited to California and 10 other states that follow the California Air Resourced Board (CARB) rules: Connecticut, Massachusetts, Maryland , Maine, New Hampshire, New Jersey, New York, Oregon, Rhode Island, and Vermont. GM spokesman Kevin Kelly told AutoblogGreen that this is all according to plan. "Chevrolet has a shortened model year for the 2016 Chevy Volt that will have a limited distribution network," he said. "The 2016 Volt will be sold in our strongest EREV markets. The 2017 Chevrolet Volt will begin production early this spring and will be available throughout the country." It appears that non-CARB state Volt customers will be able to order their Volts starting October 1, according to documents posted on Hybrid Cars, where we also learn that 2016 Volt production for California started in August, will begin in late October for the other 10 CARB states, and in early 2016 for the rest of the US. Unsurprisingly, dealers outside of the 11 CARB states have been complaining that they can't order the much-anticipated new Volt for their customers just yet. Related Video: