Since the day I pulled this 2005, Z71, 4 W/D off the lot . I have to be either right at the door or no futher then 3 feet from the truck to get the doors to lock or unlock using pendant. Some times either at the front or rear bumper it will not work. The dealer replaced the two pendants or key flops and that made no differents. I have talk to 3 other owners any they state the exact problem. Chevy says sorry about that. Also noted people writting in on Front suspension. Is this problem on 4 or 2 W/d trucks or both. Went to the site but could not see the TSB or read them.