How frustrating. This insta-flash error thing with no trace afterwards, at least dealer side, is what that old saying is all about: 'it always works for the technician'.
Yes, especially considering that exactly 1 year ago I pulled the same code and same error on the dash and they replaced it under warranty. I caught a bit of the tech/advisor's conversation via my dash cam and they were basically making fun of me after not finding the fault using their scanner. Something to the effect of "that idiot must have had the door open and saw the 'shift to park' message" and something like "sorry Charlie, not this time."
It really frustrates me that they take this attitude, especially since I attempted a warranty repair. The system is far from setup to benefit the customer. Last year when this repair was done, I had to bring the car in 3 additional times because the tech was lazy and didn't put the car back together properly each time. I was told the tech would stay after quitting time to make it right and he didn't, I had to take time off work. The final time I returned they brought the car to me and the driving mode button was not working. The tech saw me, the advisor, and another employee trying to figure it out. He popped his head in and then went home because it was after 5:00.
They loathe the informed customer. Yes, I have a VAGCOM/VCDS. Yes, I research the things wrong with my car so I can be an informed consumer but I am constantly met with attitude, contradiction, and I am forced to "fight" to receive proper service. I'm done.
Needless to say, since my warranty is now up, I will not be going back to the dealer any longer except for parts (parts mgr is an enthusiast and an all-around nice guy).