In March 2020, a month after Chevrolet started buyer deliveries of the 2020 C8 Corvette, a GM dealer technician created a Reddit thread a few leaking gearbox in a Corvette with 32 miles. That automotive hadn’t even been bought but. Since then, as a search of “C8 Corvette transmission leak” reveals, it has been tales of woe for some homeowners. One thing within the Tremec TR-9080 transaxle at the back of the mid-engined Corvette does not work because it ought to, the fault capable of trigger codes that the transmission wants service, or that the driving force must shift to park. In some instances, the battery would die due to follow-on points after the preliminary transmission code, that code stopping the automotive from powering down. As Autoevolution reports, GM filed paperwork with the National Highway Traffic Safety Administration in August to look into what is going on on.
Between discussion board threads and GM’s investigation doc, there are a number of points talked about. The most typical seems to be the dual-clutch transmission leaking fluid as a result of gasket failures like the one suffered by one proprietor at 858 miles, and one other for an proprietor at the moment enduring a second leaking transmission. The Midengined Corvette Forum reported that Chevy engineers redesigned the TR-9080 pan, becoming Corvettes with the brand new unit in some unspecified time in the future within the 2021 mannequin yr. The unique pan was stamped metal unit affixed to the engine with two studs and 13 bolts, plus “reinforcement plates.” The up to date pan is alleged to be a forged aluminum unit affixed with two studs and 17 bolts, omits the reinforcement plates, and will get a brand new machined new groove round its edge to seat the gasket seal.
The GM paperwork now on the NHTSA mentions a P1789 code, and says one purpose for it might be “particles on the park place sensor magnet inflicting an incorrect place studying to the TCM.” This is perhaps brought on by one other concern talked about in boards, which is clogged transmission filters. GM offers directions for returning transmission filters to the corporate, and a poster on one forum mentioned the Corvette tech on the dealer the place he purchased his Corvette instructed him the automaker “requires each used transmission filter to be returned to GM.”
No matter’s occurring, the issues have not stopped, they usually transcend the P1789 code. Over the weekend, a 2022 Corvette owner posted on Corvette Boards that he acquired a check engine light on his automotive after simply 850 miles. A visit to the seller returned a “P1961 code [that] reveals the transmission must be changed.”
We don’t know of the scope of the difficulty. The failure numbers are giant sufficient for GM to look into the matter, however sufficiently small to date for the NHTSA to not get entangled. The federal company solely reveals 21 total complaints for the 2020 Corvette, and none for the 2021.
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