For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2004 🢒 Envoy - 4WD 🢒 General Information 🢒 Vibration Diagnosis and Correction 🢒 Diagnostic Starting Point - Transfer Case

Diagnostic Starting Point - Transfer Case for GMC Truck Envoy - 4WD 2004

Begin the system diagnosis with the Diagnostic System Check - Transfer Case . The Diagnostic System Check will provide the following information:

•	The identification of the control modules that command the system

•	The ability of the control modules to communicate through the serial data circuit

•	The identification of any stored DTCs and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.