One problem related to trunk wiring has been reported for the 2012 Buick Lacrosse. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Buick Lacrosse based on all problems reported for the 2012 Lacrosse.
Car was parked in garage for 10 hours. Found with all lights inside and out flashing. Remote entry didn't work. Car wouldn't start. Key stuck in ignition. Overhead light and wipers turned on and off on their own and were making a clicking sound. Trunk popped open on its own, then when shut wouldn't open again with the latch over license holder. Onstar didn't work and when called they couldn't "find" my vehicle for diagnostics. Called for a jump start- jumped with battery pack, started easily and ran 5 minutes then went completely dead as soon as unplugged from power supply. Would not restart. Towed to dealer who is telling me they cannot find anything wrong with my vehicle. I will not be taking this car back until it is fixed. Huge safety concern. Couldn't set parking brake or get onstar or even get key out of ignition while all lights flashed and clicked around me- seemed like an electric or wiring problem to me which can be a fire hazard and what if I'm driving down the road at 70mph and all electric goes dead- steering and all. I have e-assist and second battery doesn't help when don't have power to transfer power. I have had car only for one year brand new.