I have a 2008 Grand Prix and trying to find out what is causing all 4 door locks to work intermittently either with the key fob or inside door switches. The doors would lock when you start driving. It seams like the hotter the air temp is the worse they work. Some days three may not lock but driver door wil lock then other days the driver door ad rear passenger door will lock but not the other ones. Today the air temp is 89 degrees and none of the doors will lock or unlock. When it was new it was random and dealer said nothing was wrong the the locks since there is no trouble codes. Could it be the Body Control Module? Also, the passenger air bag is intermittently and goes off and on at times. Dealer indicated no trouble code, no problem. Any help is appreciated.
