The dual clutch transmission on my 2020 C8 Corvette has a diagnostic code of p1955. This was determined after the service light on the vehicle illuminated and it was taken to service at the dealership. Other codes that stored included p0868 and p0869 which indicate low hydraulic pressure and high hydraulic pressure respectively. The p1955 code is an internal fault that requires complete replacement of the transmission according to GM service bulletins. This bulletin also advises that no repair attempts are to be made except for complete replacement. The vehicle has not shown any symptoms currently. Gears shift normally, there are no vibrations, etc. However, the dealership advised the transmission can go into limp mode, fail completely, or damage other components of the power train at any point. This issue is known to GM. They have investigated the matter since 2021 or earlier. There have been no recalls on the transmission despite the safety risks of sudden loss of power, being stranded, or catastrophic destructive failure without warning. These pose risks to occupants inside the vehicle and other vehicles or people on the road. My repeated questioning of this matter to the dealership and GM customer service have been ignored. They only advise the cost to replace is with the owner of the vehicle despite the root cause being at the level of engineering of the part. They are unwilling to admit this failure is at the level of a manufacturing/engineering defect as a financial cost mitigation strategy. The Issue with sudden failure of the transmission in these vehicles are widely known, investigated, and occurring at a high rate, especially in early model C8 Corvettes.

Source: NHTSA complaint ODI #11737257 · view all complaints for this vehicle at nhtsa.gov

GM REFUSES TO REPLACE THE BRAKE MODULE DESPITE THE FACT THAT THIS HAS BEEN KNOWN SINCE SEPTEMBER 2020. THE REMEDY "IS INCOMPLETE"AND PARTS ARE NOT YET AVAILABLE. IT IS LUDICROUS TO ASSUME THAT PARTS ON A CURRENTLY PRODUCED CAR ARE NOT AVAILABLE. THEY ARE INSTALLING THIS MODULE DAILY. THESE ARE BRAKES THAT CAN FAIL AND CAN CAUSE AN ACCIDENT WHEN THEY DO FAIL.

Source: NHTSA complaint ODI #11397352 · view all complaints for this vehicle at nhtsa.gov

My left rear axel/rear differential/ control arm snapped with normal driving and breaking. It is available for inspection. This mechanical failure made me loose control of my vehicle on the busy freeway and threw me across a lane into the freeway center divider. Nearly caused a pile up accident and killed me.. The dealership service department checked it in today. I filed a claim today with the manufacture but nobody looked at it yet. There were no warning lamps and i believe there is still no warning lamps

Source: NHTSA complaint ODI #11742799 · view all complaints for this vehicle at nhtsa.gov

We have a water leak that was coming in both windows and onto the floor. Since reported it the car will slow down while driving because of codes issues about the doors are not closed and it is. I feel it's due to the water leak that is coming into the car. Took the car to a Chevrolet Dealer in Columbia South Carolina and they said it was coming from the roof weather stripping. They said it wasn't a recall for the 2020 C8 Corvette corvette yet. Also called GM Customer care to see if I can get some help to get it fixed. No luck.

Source: NHTSA complaint ODI #11710974 · view all complaints for this vehicle at nhtsa.gov