 An update to my previous post. The TCM ground fault is clearly not the problem as the car continues to slip out of gear. I took it back to the dealer, they kept it for 6 days, then called to say that it "needs a new transmission" that will cost over $5200. Others have posted that they have paid for a new transmission only to have the same problem.
 Do not buy one of these cars for any reason. I am now stuck with a car that moves only when it wants to, that I can't allow my kids to drive, that my wife refuses to drive, and that I cannot sell because my conscience won't allow it.