GM Opens Official Investigation Into C8 Corvette Transmission Leaks

GM had paperwork with the National Highway Traffic Safety Administration. That is to investigate a situation that occurred back in March 2020. It was a month after Chevrolet began customer deliveries of the 2020 C8 Corvette. This was after a GM dealer technician had creating a Reddit thread about a leaking gearbox in a Corvette with 32 miles. Moreover, that car had not even been sold yet. However, since then, as a search of “C8 Corvette transmission leak” does show, is real issue for some owners.

GM and the C8 Corvette Transmission Leak

Something in the Tremec TR-9080 transaxle in the back of the mid-engined Corvette doesn’t work as it should. Therefore, the fault is able to causing the codes that the transmission needs service, or that the driver does, in fact, need to shifting to park. In some cases, the battery would die because of follow-on issues after the initial transmission code. This code would prevent the car from powering it down.

There are many issues which are mentioning. Moreover, between the forum threads and GM’s investigation document. It seems the most common does appear to be the dual-clutch transmission leaking fluid. This is due to the gasket failures like the one suffered by one owner at 858 miles. There is another for an owner who is currently, in fact, enduring a second leaking transmission. The Chevy engineers are redesigning the TR-9080 pan. It is fitting Corvettes with the new unit at some point. It is in the 2021 model year.

In fact, the original pan was a stamping steel unit affixing to the engine with two studs and the 13 bolts, plus “reinforcement plates.” Plus it gets a new machined new groove around its edge to seat the gasket seal. So, if you were planning on adding the C8 to your car collection, you may want to hold off.