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Home >> GMC >> 2000 >> Yukon Base, 4.8 V, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Body Control Modules - Old Style) >> Diagnostic Tests >> DTC 12: Diagnostic System Check >> Description

DTC 12: Diagnostic System Check: Description

WARNING: This page is about a different variant/trim than selected.

DTC 12 is always displayed as the first code, indicating diagnostic display is in progress. If DTCs do not display, go to Testing  . If DTCs display, go to appropriate diagnostic procedure. See BCM DTC DEFINITIONS  table under SELF-DIAGNOSTIC SYSTEM.

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