STOPS RUNNING NO REASON on 2006 Buick LaCrosse

MY LACROSSE HAS AN INTER MITTEN PROBLEM IT STOPS RUNNING.AS I DRIVE ALONG IT JUST STOPS.THEN IT WILL NOT START. BEEN TOWED 3 TIMES DEALER FINDS NOTHING WRONG, NO CODES SHOW.IT WILL START EVERY TIME WHEN IN SHOP.IN FACT AS SOON AS OFF TOW TRUCK IT WILL START .NEVER THE SAME. IF FRONT END ELEVATED WILL NEVER START MUST BE ON LEVEL GROUND. ANY HELP??? MARY

by in Rochester, NY on June 08, 2010
1 answer
ANSWER by on August 24, 2010
have experienced the same problem, although not on a buick (pontiac). check the red box(main power supply) located in engine compartment. nut was loose causing poor connection which will kill engine. vehicle always started after tow, but showed no codes due to loss of main power. good luck.*** and I worked at a gm dealership