One problem related to power train driveline has been reported for the 2005 Buick Lacrosse. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Buick Lacrosse based on all problems reported for the 2005 Lacrosse.
My 2005 Buick Lacrosse has had a problem with acceleration since I bought it used in 2006, if you step on the gas between 50 and 60mph the engine dies, no warning lights come on and you have to idle out of traffic until the system comes back on, I took it to Buick and they told me they couldn't find anything wrong, to this day you have to watch your speed when passing so that you do not lose power.