Chevy notified the NHTSA of the ongoing investigation.
General Motors has issued a service update to sort problems relating to the transmission control module in 2020 and 2021 C8 Corvette Stingrays, according to GM Authority. This has been a common problem with the C8, and in one case, a transmission failed within 32 miles, even though the owner stuck to the strict running-in instructions.
The problem stems from the transmission control module, which can detect a loss of communications. Unfortunately, the loss of communications code is cleared once the car is switched off, making it impossible to track with diagnostics equipment. Once the vehicle is switched back on, the C8 may not detect the problem again, which means the malfunction light on the instrument cluster does not illuminate.
The problem is not a safety risk, however. It could prevent the gearbox from operating and communicating more serious diagnostic trouble codes or illuminating a malfunction indicator lamp.Thankfully, the new C8 comes standard with over-the-air updates, which means the owner can fix it by using the touchscreen interface and a Wi-Fi connection. Customers who aren't as tech-savvy can go down to the nearest Chevrolet dealership to get it sorted.
General Motors has also informed the National Highway Traffic Safety Administration (NHTSA) about another investigation into the Corvette's dual-clutch transmission. This concerns a leaky transmission and filter contamination, well before the recommended 7,500-mile service.
According to the initial report, the problems are caused by debris on the park position sensor magnet, leading to an incorrect position reading sent to the transmission control unit. An entire transmission replacement is required in severe cases, as none of the park controls are serviceable.
In early September, Chevrolet revealed that a total of 25,782 Corvettes have been completed for the 2021 model y at the Bowling Green manufacturing plant.