I never had a code either. Tried 3 OBDIIs. Even right after it happened but never a code. Dealership took it in and as soon as they inspected and tested it, they called to tell me it failed the compression tests and had to be rebuilt.I have an appt Thursday for the trans. It is getting worse and worse so I told my wife we needed to park it till then. My question is, although It is shifting absolutely horrible it has yet to throw a code (that I can see) when I take it in will they be able to see some codes or no since there has been nothing shown on my app or any lights on my dash etc.