One problem related to emission control has been reported for the 2002 GMC Envoy. The most recently reported issues are listed below.
Air conditioning system failure at 7,000 miles : vehicle computer related emission control system failure / damaged components at 12,000 miles stabilizer bar link failures complete dashboard gauge cluster failure rear brake deterioration, heavy brake damage passenger side mirror loss of control power steering pump failure transmission module/ fwd failure battery failure cruise control failure valve lifter tapping emergency brake failure seat belt shoulder restraint lockup, passenger side.