One problem related to engine belts and pulleys has been reported for the 2006 GMC Envoy. The most recently reported issues are listed below.
The contact owns a 2006 GMC Envoy. While driving approximately 30 mph, the vehicle vibrated and the engine stalled intermittently. Prior to the failures, the engine warning light illuminated on the instrument panel. The vehicle was taken to an authorized dealer and they replaced the intake valve, head gasket, timing belt, and cylinder head. The failures recurred on a separate occasion. The vehicle is currently not being driven due to the safety risk involved. The contact will take the vehicle to the authorized dealer for diagnostic testing and repair. The failure mileage was 14,000 and current mileage was 16,000.