OK, the strange thing about this condition is that it happens WHILE DRIVING! (2003 CTS with LS package and Bose NAV)
The MO is strange. the car can be speeding up or keeping a constant speed. The cruise may be active or not... The condition though is always unexpected. You will be driving along and the engine will just shut off and then the NAV screen will display "STARTING DISABLED REMOVE KEY".
Sometimes while coasting to the side of the road, it will magically come back to life and continue like nothing happened. Sometimes you will have to get off the road and then restart it. If the cruise was set, the condition shuts off the cruise and resets all driver presets to a factory default.
I have had OnStar do the remote diagnostics and they have found nothing. Once they do the check however, the cruise control will become active again, at least indicating that the system has been cleared.
Has anyone dealt with anything like this before? I would think that the key check is done only at startup... Is it always checking the key?
The dealer of course has no clue. They have replaced the keys and the Theft deterrent Control Module. It still hapens about 1 or 2 times a month.