where is location of the crankshaft position sensor on 2011 buick lacrosse 3.6

Free play in the crankshaft reluctor wheel, debris, wiring issues can all cause this code, besides a faulty sensor. Troubleshooting is highly recommended. It is located at the back of bank one of the engine block. This is the back of the engine, closest to the firewall. It is below the cylinder head, likely below cylinder 2 area (middle). Check for wiring issues first and foremost.