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Home >> GMC >> 2000 >> C3500 HD 6.5 F, Standard >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Anti-Theft System - Escalade, Express, Pickup, SAVANA, TAHOE & YUKON DENALI >> Diagnostic Tests >> DTC U1255: Class 2 Communication Malfunction >> Circuit Description

Circuit Description

This DTC sets when ignition is active and communication between Passlock™ module, DLC and other modules has been lost. This DTC is usually a history DTC. If ignition was off, vehicle will not start. If vehicle was running, vehicle will restart, but SECURITY indicator light will remain illuminated.