One problem related to automatic transmission control module has been reported for the 2012 GMC Acadia. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 GMC Acadia based on all problems reported for the 2012 Acadia.
While driving at highway speeds last week my 2012 awd Acadia having a major malfunction. 1. While driving, door locks engage/disengage 2. Trans appears to slip into neutral (high rev/ no power) 3. On the dashboard digital readout the transmission "blinked" into p from d (while driving) 4. Traction control engages/disengages and the vehicle lurches forward and hard stops 5. Trans enters some sort of limp home mode where it allows me to drive only up to 60mph, @4000 rpm (like 3rd gear) this process repeated continually for over an hour drive to the dealer, normal operation appeared to occur at speeds below 45mph, but only temporarily and the issue continued again at the lower speeds. I call onstar and they pull codes for me while enroute to the dealer: ecm code =u0101 tcm code= none (failed to probe module) abs code= u0101 abs code= c0561 (issue with traction control system)- "service within 7 days" a quick search in automotive forums reveals several other people with almost the exact same issue, with no specific solutions.