GMC Envoy owners have reported 2 problems related to rear suspension shock absorber (under the suspension category). The most recently reported issues are listed below.
At refueling, vehicle was in "normal" pitch alinement. After refueling, and upon leaving the service station, vehicle exhibited unusual rear end bounce, as if shock absorbers were missing. After two mile trip at city street speed, vehicle was parked. Visual inspection revealed that rear end was sagging about six inches down, or more. Vehicle was driven to dealer (about three miles) and examined. Service department reported that compressor for load leveling system was leaking and had failed. If this had occurred at highway speed with a towed load, I believe I would have lost control of vehicle.
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all problems of the 2002 GMC Envoy
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Suspension compressor failure allows rear-end to bottom out creating potential loss of control. With the compressor gone, there is no shock absorption at the rear.