Three problems related to automatic transmission control module have been reported for the 2004 GMC Envoy. The most recently reported issues are listed below.
While driving down the highway, my GMC Envoy xl shuddered then stalled. The ses light and reduced power light came on causing an extreme safety hazard as we were on a highway (speed limit 65 mph). The dealer, regal automotive in lakeland stated that the computer that controls the drive train lost contact with the vehicle. They informed us that this is a common problem with the Envoy and that they have a service bulletin for a program update. However, no recall have been issued.
2004 GMC Envoy developed the following problems: vehicle stalled, turn signals stopped working, blower fan stopped working, and the srs light remains lit. The turn siganls stopped working due to a short in the flasher. The powertrain control module was replaced due to the ses light iluminating. The blower motor fan failed 4 times due to a short in the wires and control head. The vehicle overheated, but the problem could not be diagnosed. The lcd displays, knobs become extremly hot after hours of driving.
There is a malfunction in consumer GMC Envoy power train control module resulting in failure to accelerate.