TechLink

TCSC Top Issues This Week

The Techline Customer Support Center (TCSC) is available to help dealerships with diagnostic and programming issues related to Techline Connect (TLC) and the Service Programming System (SPS). TCSC has now […]

May 27, 2026 —

Create Custom Data Lists in GDS 2

The latest update to GDS 2 in Techline Connect provides technicians with the ability to build personalized data parameter lists tailored for specific diagnostic sessions — identifying only the data […]

May 21, 2026 —

Updated Transfer Case Input Shaft Seal Installation

Seal installation depth is critical when replacing the transfer case front input shaft seal between the transmission and transfer case on 2020-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with […]

May 21, 2026 —

A/C Leak Detection Dye for EVs

GM has recently established a new air conditioning refrigerant leak diagnostic procedure for GM EVs and PHEVs — including the Silverado EV, Blazer EV, Equinox EV, Bolt EV/EUV, Corvette E-Ray, […]

May 21, 2026 —

When and Why to Use Fuel Additives

Fuel additives are not routine maintenance items. The latest GM guidelines recommend using approved products only to address a verified vehicle condition or fuel-quality concern on GM passenger cars and […]

May 21, 2026 —

GM Service Know-How Emerging Issues

The monthly GM Service Know-How Emerging Issues seminars provide service/technical information on current issues and GM-certified repairs. This month the seminar (10226.05V – U.S.) offers tips on completing the Multi-Point […]

May 21, 2026 —

Lunch with Your FSEs May Meeting

The monthly Lunch with Your Field Service Engineers meeting will take place May 20. The one-hour meeting will be held online via Microsoft Teams and offers GM dealership technicians, shop […]

May 18, 2026 —

Check 55-Way Connector if Glow Plug DTCs are Set

There may be several glow plug DTCs set on some 2024-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax diesel engine (RPO L5P). DTCs may include: P066A […]

April 27, 2026 —

Setting Up Wired and Wireless MDI 2 Connections

There are several possible methods – both wired and wireless – to connect with the MDI 2 (EL-52100). (Fig. 4) Which is best for you depends on typical use of […]

April 27, 2026 —

MDI 2 Advanced Setup Technical Tips Update

With the MDI Manager application software, the MDI 2 can be configured to communicate with a PC using several possible networks, such as a USB cable, ethernet cable, Wireless Local […]

April 27, 2026 —

April Service Newsletter from the Experts at GM TAC

The latest diagnostic assistance from the professionals at the GM Technical Assistance Center is now available in the April GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]

April 27, 2026 —

Latest Techline Connect Update and DISG Release Include New Firewall Exclusions

The latest Techline Connect update and GM Dealer Infrastructure & Security Guidelines (DISG) release include new firewall exceptions for Techline Connect applications. For the recent Techline Connect application update, your […]

April 24, 2026 —

Engine Oil Consumption Guidelines

All engines require oil to lubricate and protect internal moving components from wear. When a piston moves down its cylinder, a thin film of oil is left on the cylinder […]

April 24, 2026 —

2nd-Row Rear Seat Operation and Diagnostic Tips for Full-Size SUVs

The 2nd-row seats (RPO AT6, ATV) available on 2021-2026 Tahoe, Suburban, Yukon, Escalade and 2025-2026 ESCALADE IQ models include a number of adjustment features, such as fore/aft, recline, folding and […]

April 24, 2026 —