Join Date: Jan 2012
Location: Montreal, Canada
Had the same problems and brought it to my dealer.
They said it's the new electronic transmission shifting points that causes
the problems. after reprograming it, everything is fine now. I have 11000km
But you have to be persuasive for them to take charge...
Get a logbook everytimes it happens, date, weather, temperature, engine temp, mileage etc
Hope this helps
new Buick owner ... new daddy