2006 Envoy 5.3L Engine computer 12596679 "Programmed to your VIN" ECM PCM ECU
This E.C.M. fits the following vehicles: 2006 5.3/6.0 liter Buick Ranier, GMC Envoy, Envoy XL, Chevrolet. Note: If this ECM is for a 2006 GTO the ECM will have to be linked to the powertrain interface module before the vehicle will start.