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Home › GMC › 1998 › Forward Control 6.5 F › Repair and Diagnosis › Engine Performance › System › Engine Control System - Tests W/Codes - Introduction › Self-Diagnostic System › Diagnostic Trouble Code (DTC) Definition › Notes

Diagnostic Trouble Code (DTC) Definition: Notes

NOTE: Use of Tech 1 or Tech 2 scan tool is required to retrieve DTCs. Refer to user reference manual supplied with scan tool.
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