One problem related to loud engine noise has been reported for the 2011 GMC Acadia. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 GMC Acadia based on all problems reported for the 2011 Acadia.
My 2011 GMC Acadia would not start one morning. We put a battery charger on it. It started but has a pinging sound. We checked the oil. The oil was reading low. We added 3 qts of oil. We had auto repair shop change oil and install new battery. I still noticed the pinging sound. That evening, as I was driving the engine started making terrible sounds and loosing power. I stopped driving and had it towed to dealer. They said the engine was blown. I had no warning lights come on at all. The dealer is telling me it is most likely the timing chain. The Acadia is only 5 yrs old with 116k miles. This should not be happening to this new of car. I have spoken to several mechanics and they all say this is a known issue with the Acadia and this should be a recall or warranty issue. Equally frustrating, I bought a warranty that I was told was an "extended warranty" that I thought would lover it now I'm being told the warranty was from the date of purchase which is not what the salesmen told me when I bought it. I feel totally taken advantage of as a women.