GM studies indicate that restricted transmission oil flow is detrimental to the life of any automatic transmission. Plugged oil coolers and oil cooler line restrictions cause insufficient transmission lubrication and […]
The Positive Crankcase Ventilation (PCV) system and other components that affect emissions, but do not turn on the Check Engine lamp if there is a malfunction, are required by the […]
The Check Engine MIL may be illuminated and DTC P20EE (NOx Catalyst Efficiency Below Threshold) may be set on some 2017-2018 Silverado and Sierra models equipped with the 6.6L Duramax […]
The latest update to the GM Global Electronic Parts Catalog (EPC) includes several new features that make it easier and more convenient to search for parts and to quickly find […]
At TechLink, we cover a wide range of GM service topics, from the latest diagnostic and technical repair information to new model features, special tools and more. It’s our mission […]
Did you know the new Dealer Case Management (DCM) system allows U.S. GM dealership service technicians to create, view, and update GM Technical Assistance Center (TAC) cases in real-time? DCM […]
A new version (18.1.161) of the GDS2 core software has been released recently. The update includes numerous software bug fixes. To download the software update, click the GDS 2 […]
GM has recently released a new refrigerant PAG (Polyalkylene Glycol) oil (Fig. 7) specifically engineered to service GM vehicles built with belt-driven air conditioning (A/C) compressors that use the environmentally-friendly […]
The cooling system surge tank for 2017 Silverado and Sierra models equipped with the 6.6L Duramax diesel engine (RPO L5P) features a new design with two tank caps. The fill […]
The all-new 2018 GMC Terrain is available with a variety of new features that may be unfamiliar to some customers, who may bring their vehicle into the dealership for service […]
Search TAC Cases Using the Dealer Case Management System
Infotainment Setup Tips for Using Google built-in
August Service Newsletter from the Experts at GM TAC
GM Service Know-How Emerging Issues
Diagnostic Tips for Exhaust Charge DTCs
EVAP System Leak Testing
Rear Axle Moan During Turns
Exhaust Heat Shield Rattle
Residue on Liftgate Strut is not a Fluid Leak
Cooling Fan Speed Too Low Condition
Cradle Brace Mounting Rattle
Diesel Exhaust Fluid Contamination in the Fuel System
New Components Available for Pre-Repair Authorization Using the CSMT App
Two Seal Designs Included in 10-Speed Transmission Auxiliary Pump Seal Kit
Front Heated Seat Malfunction After Collision Repairs
Service Transmission Messages Require Engine Control Module ReprogrammingService Programming Direct Launch Handling
GM Dealer Equipment (GMDE)
GM EV Safety Gloves
TAC Newsletter September 2022
Techline Connect Setup
for Updates
In order to accurately diagnose a battery’s state of health from a vehicle in for service or that is part of the dealership’s inventory, the EL-52800 Diagnostic Charge Battery Station […]
A wireless network in the dealership service department offers the freedom of connecting a variety of devices without being tethered by wires. But wireless networks have limits since, in a […]
Take a detailed look at a wide range of innovative features and advanced systems found on GM vehicles to gain a better understanding of proper operation. Each short video reviews how a feature works, highlights operating tips and shows ways to customize settings, if applicable.
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