My local dealer cannot help after taking it in 6 (!) times - claims they cannot reproduce. It started with intermittent "Charging System" indicator lights that would clear. Now its a huge mess - cannot start the truck, or if i use autostart the car will run for only a few seconds and then stop - and lock me out of the car. The engine will just stop while driving. Opening and closing the door (even in park) will shut off the engine. I'm at my wits end - i cannot be the only truck experiencing this issue. Any ideas????

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The battery could be just slightly weak and with all the electronics the Lariat has this makes for strange problems. A Costco battery has 3 year free warranty replacement and they don't have test equipment. If you bought a battery there and suspected a problem after two years just take it back no questions asked.

 

thanks - advanced auto parts tested both the battery and the alternator and said that they were great.

 

For what it is worth - took this to a different dealer and they believe they have isolated the issue - corroded ground to the BCM

 

That's a dead giveaway that there is an open/high resistance ground somewhere. Unusual and illogical dependencies and reactions.