Technical Service Bulletin 677153A — 1994 GMC P SERIES

ELECTRICAL SYSTEM:IGNITION:MODULE

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Bulletin Details

TSB ID 677153A
Manufacturer
Vehicle 1994 GMC P SERIES
Component ELECTRICAL SYSTEM:IGNITION:MODULE
Communication Date

Bulletin Summary

NO UPSHIFT/2ND GEAR ONLY AFTER COLD START-INTERMITTENT DTC 87 - HIGH RATIO ERROR (REPLACE EPROM). *TW

About Technical Service Bulletins

A Technical Service Bulletin (TSB) is a document issued by a vehicle manufacturer to its dealers, describing a known issue with a specific vehicle or set of vehicles and the recommended procedure to fix it. Unlike recalls, TSBs are not mandatory and are typically only performed if an owner reports the related issue. However, TSBs can be an indicator of common problems with a vehicle.

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