One problem related to front air bag has been reported for the 2006 GMC Envoy. The most recently reported issues are listed below.
Will be driving down the road and depending where located in seat, the passenger airbag will disable. This vehicle has cloth seats and does not have the leather. You must wiggle around in the seat to make the passenger airbag reactivate. Sometimes it works and sometimes you must stop and cut off and restart the vehicle to make it work. This is intermittent.