Just bought a used 2006 Cobalt LS and looks like I have run into a common problem on this vehicle. The power door locks do not work on either the driver or passenger door. I also tried to lock and unlock from the key fob and no luck there either. The trunk release on the fob works so I know it's not the battery. I have checked the fuse in the block and it is OK. Does this look like a bad BCM and if so any ideas of the cost involved in replacing it or is there something else I should be checking first?