Self-Diagnostic System: Notes

WARNING: This page is about a different car, the 2003 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Accessing self-diagnostics for 30 minutes without running engine will discharge battery, resulting in a possible no-start condition. To ensure proper operation, attach battery charger to battery.

NOTE: Diagnostic trouble code tests are written specifically for use with GM Tech I or Tech II scan tools. Generic scan tool can be used but may have limited functions. This article only covers the portion of those systems which relates to charging system diagnosis. For further information, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE or BODY CONTROL MODULES - CTS article in ACCESSORIES & EQUIPMENT.