LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1998 >> Forward Control 7.4 B >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 7.4L >> Diagnostic Trouble Codes >> DTC P0602 - VCM Not Programmed >> Circuit Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit Description

This DTC indicates that VCM's internal program memory has not been flashed with any vehicle software. If a replacement VCM is installed and not flashed, engine will not run. This DTC is used to indicate that engine cranks, but will not run due to an unflashed VCM.

Conditions for setting DTC:

scientia non olet · About LEMON Manuals