For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2004 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 Accessories 🢒 Power Take-Off 🢒 Diagnostic Starting Point - Cruise Control

Diagnostic Starting Point - Cruise Control for GMC Truck TopKick C-Series (Conventional) C6/C7/C8 2004

For vehicles equipped with a caterpillar engine, refer to Caterpillar Diagnostic Information. For all others, begin the system diagnosis with the Diagnostic System Check - Cruise Control . The Diagnostic System Check will provide the following information:

•	The identification of the control modules which command the system.

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

•	The identification of any stored diagnostic trouble codes (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.