The 2025 Technician Excellence Program (U.S.) recognizes and rewards enrolled dealership technicians for achieving technical training certifications and meeting other service criteria. Program criteria include training achievements in the Center […]
The Mark of Excellence program (U.S.) recognizes the achievements, professionalism and commitment of GM service technicians as well as other dealership personnel. For the 2025 program, enrolled technicians who meet […]
Proactive Alerts, a feature of OnStar Advanced Diagnostics, are designed to help predict specific types of potential performance degradation based on current vehicle data. Several new Proactive Alerts have been […]
The 2025 ESCALADE IQ, the first-ever all-electric full-size SUV from Cadillac, redefines the luxury SUV experience with an Ultium Platform delivering a Cadillac-estimated 460 miles of range, vehicle-to-home bidirectional charging […]
There may be a vibration or rattle sound in the body of the vehicle on some 2025 Equinox models. The vibration or rattle may be more noticeable under light load, […]
The high-voltage (HV) battery in 2022-2025 HUMMER EV; 2023-2025 BrightDrop, LYRIQ; 2024-2025 Blazer EV, Equinox EV, Silverado EV and Sierra EV models requires updated Battery Energy Control Module (BECM) calibrations […]
Multi-Factor Authentication (MFA) — an identity verification process that requires at least two methods of authentication, such as a password and a temporary passcode, to verify a user’s identity — […]
If an error occurs when launching the Techline Connect (TLC) application, the first solution is often to try to restart TLC. If the application still does not start correctly, it […]
Electric Vehicles (EVs) feature a number of electronic control modules that may require software updates. These updates are important to not only resolve operating issues, but also to enhance vehicle […]
There may be a GCW Overweight message displayed on the Driver Information Center of some 2022-2025 Silverado 1500, Sierra 1500; and 2024-2025 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with […]
Due to a recent update of the Google Maps application, an issue may arise in which the infotainment system (RPO IOK, IVD, IVE) has a persistent “Offline” icon in maps […]
The monthly GM Service Know-How Emerging Issues seminars provide service/technical information on current issues and GM-certified repairs. This month the seminar takes a first look at the all-new 2025 Escalade […]
There may be low oil pressure in the 5.3L V8 engine (RPO L84) or 6.2L V8 engine (RPO L87) on some 2019-2024 Silverado 1500, Tahoe, Suburban, Sierra 1500, Yukon; and […]
The Diesel Exhaust Fluid (DEF) tank may appear to be empty shortly after beginning a towing trip or it may be difficult to properly fill the DEF tank on some […]
The latest diagnostic assistance from the professionals at the GM Technical Assistance Center is now available in the October GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
A 2025 Full-Size SUV Action Center for U.S. dealerships has been established by the GM Technical Assistance Center (TAC) to provide feedback on the new 2025 Tahoe, Suburban, Yukon and […]
GM has recently begun moving authentication for several applications, including Service Workbench and Techline Connect, to Microsoft Azure, which offers additional security, a variety of application development tools and an […]
The Techline Connect (TLC) browser launch page (Fig. 3) for users in several U.S. states was updated recently to improve overall application stability, allow for faster updates and enhance resolution […]
CX Connect Case Creation Tips
New Diagnostic Strategy: Reprogram Control Modules Before Replacement
Corvette Center Console Latch Pushbutton Replacement
New Dash Cover Addresses Windshield Glare
The Info on Dealer Information — Choosing the Right Contact for Service Department Concerns
GM Service Know-How Emerging Issues
Learn More About CX Connect – New System Going Live Soon
Techline Connect & GDS2 Split Update Released
Poor A/C Performance Due to Loss of Refrigerant
Loss of A/C and Warm Air Conditions
July Service Newsletter from the Experts at GM TAC
Power Hood Closure Conditions
Diesel Engine Oil Cooler Seal Leak
Check Grounds for No Start Condition
Battery Cable Clamp Alignment Results in Low Voltage
Upper Body Auxiliary Lamp Connection
Anti-Chip Coating Appearance on Full-Size Trucks
GM Service Know-How Emerging Issues
OneCRM and Dealer Case Management System MigrationDCA-8000
Troubleshooting
Guide
TAC Newsletter September 2025
TAC Newsletter August 2025
Techline Connect Tips November 2024
CX Connect Case Creation Help + Tips and Tricks
The fluorescent dye installed in the air conditioning refrigerant system of all current GM vehicles helps in locating leaks in the A/C system. Using the GE-42220 Universal 12V Leak Detection […]
As Service Programming System (SPS) events become larger in size and more frequent for all GM models, it’s important to ensure the most reliable connection method to the MDI 2. […]
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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