Diagnostic Starting Point - Automatic Transmission: Notes
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Begin the system diagnosis with DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS in Engine Controls - 4.8L, 5.3L and 6.0L. The Diagnostic System Check provides the following information:
- The identification of the control module(s) which commands the system.
- The ability of the control module(s) to communicate through the serial data circuit.
- The identification and status of stored diagnostic trouble codes (DTCs).
The use of the DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS in Engine Controls - 4.8L, 5.3L and 6.0L identifies the correct procedure for diagnosing the system and the procedure location.