In an effort to get the most useful information to dealerships, the GM Technical Assistance Center (TAC) has released an updated list of organizational contacts for service departments. (Fig. 12) […]
The monthly GM Service Know-How Emerging Issues seminars provide service/technical information on current issues and GM-certified repairs. This month the seminar reviews how to diagnose HVAC leaks. (Fig. 13) […]
The launch of CX Connect, GM’s new Dealer Case Management system (U.S. only), is just around the corner, going live on August 11, 2025. The new CX Connect platform (Fig. […]
The rollout of the Techline Connect and GDS2 split update continues this week. On August 6, 2025, changes to the way GDS2 operates was released to all GM dealerships in […]
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 […]
There may be a loss of air conditioning, weak cooling or warm air coming out of the vents on some 2024-2025 Silverado 1500 and Sierra 1500 trucks. These conditions may […]
The latest diagnostic assistance from the professionals at the GM Technical Assistance Center is now available in the July GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
The power hood (RPO AHV) (Fig. 1) on some 2022-2025 HUMMER; 2024-2026 Silverado EV, Sierra EV; and 2025-2026 ESCALADE IQ models may not close or cinch shut properly. There may […]
Some 2024-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax diesel engine (RPO L5P) may have an engine oil leak. In many cases, the oil leak may […]
There may be a no start condition on some 2025-2026 Equinox and Terrain models. In addition, the starter may click and there may be several DTCs set in the Engine […]
Some 2023-2025 Colorado and Canyon models may have a no start condition, a possible dead battery and multiple messages displayed on the Driver Information Center. There also may be several […]
The left or right rear upper body auxiliary lamp (Fig. 11) may not illuminate on some 2025-2026 ESCALADE IQ and ESCALADE IQL models. The upper body auxiliary lamp connector may […]
All 2018-2026 Silverado 1500, Sierra 1500; and 2019-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks have stone guard protection applied to the lower painted surfaces that provides added defense against stone […]
The monthly GM Service Know-How Emerging Issues seminars provide service/technical information on current issues and GM-certified repairs. This month the seminar covers installing the accessory puddle lamps on the ESCALADE […]
Blank Screen Display Diagnostic Tips
Make a Reservation to Meet with Your FSEs in 2026
GM Introduces Digital Key, Offering Convenience and Easy Access
Key Cards Put Vehicle Access in Your Wallet
New 2026 Corvette ZR1X Delivers Twin-Turbo AWD Hypercar Performance
MDI 2 Manager Update Adds Support for New Wireless Dongles
Latest CX Connect Update Delivers Streamlined Operation and Enhanced Search Functions
GM Service Know-How Emerging Issues
Engine Control Module Diagnosis and ECM Part Restriction
Front Brake Caliper Sound and Uneven Pad Wear
3rd-Row Seat Switch Diagnosis
Check Ground Terminals for Transmission Fluid Temperature Sensor Circuit Condition
December Service Newsletter from the Experts at GM TAC
FSE Technician Recognition Awards – 4th Quarter 2025
Enroll Today in the 2026 Technician Excellence Program
Verify Vehicle Settings After Rocker Panel Ground Lamps Installation
Heated Steering Wheel Replacement
Door Panel Wood Trim Condition
GM Service Know-How Emerging IssuesDCA-8000
Troubleshooting
Guide
TAC Newsletter January 2026
TAC Newsletter December 2025
Techline Connect Tips November 2024
CX Connect Case Creation Help + Tips and Tricks
All buttons on one key fob (Remote Keyless Entry transmitter) may be inoperative on some 2023-2026 Escalade, LYRIQ, Corvette, Silverado 1500, Silverado 2500HD/3500HD, Tahoe, Suburban, Sierra 1500, Sierra 2500HD/3500HD, Yukon; […]
To avoid wait times for technical support in the dealership, prior to contacting the GM Technical Assistance Center (TAC) and Techline Customer Support Center (TCSC) as well as and other […]
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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