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 […]

November 4, 2026 —

Spray-On Bedliner Change Provides New Appearance on Silverado and Sierra Trucks

The application process of the spray-on bedliner (RPO CGN) available on Silverado 1500, Silverado 2500HD/3500HD, Sierra 1500 and Sierra 2500HD/3500HD trucks has been updated during 2026 model year production. The […]

October 30, 2026 —

MDI 2 Manager Software Update Displays New Logging Status Icons

The latest software update for the MDI 2 Manager is being rolled out to GM dealerships (U.S.) The staggered rollout of the new MDI 2 Manager software (version 9.7.3109.193) includes […]

October 30, 2026 —

Failed Evaporator Check Valve May Lead to Poor Cabin Heating/Cooling

Some 2024-2026 Silverado EV, Sierra EV; 2025-2026 ESCALADE IQ, OPTIQ, Equinox EV, HUMMER EV; and 2026 ESCALADE IQL models may have inadequate cabin heating or cooling along with a Service […]

October 30, 2026 —

October 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 October GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]

October 30, 2026 —

BCM Series: Let’s Hear it for Horns and Pedestrian Alerts

While the conventional horn system (Fig. 10) has been a common feature found on automobiles for decades, the pedestrian alert system is a relatively new system on hybrid and electric […]

October 30, 2026 —

BCM Series: Wiper and Washer Systems

Let’s get the dirt on modern wiper and washer systems. These advanced systems rely on electronic controls, sensors, and BCM communication to optimize wiping performance and help maintain visibility in […]

October 23, 2026 —

BCM Series: Checking the Mirrors

There is more to the Mirrors system than meets the eye on many GM models. From power controls for driver and passenger outside rearview mirrors to folding, heated and memory […]

October 16, 2026 —

Lunch with Your FSEs October Meeting

The monthly Lunch with Your Field Service Engineers meeting will take place October 21. Each one-hour meeting is held online via Microsoft Teams and offers GM dealership technicians, shop foremen […]

October 16, 2026 —

Inoperative Tailgate Diagnostic Tips

There may be a Tailgate Ajar message displayed on the Driver Information Center even though the tailgate is fully closed on some 2022–2026 Silverado 1500, Sierra 1500; 2024–2026 Silverado 2500/3500 […]

October 9, 2026 —

BCM Series: Fixed and Moveable Windows

Power windows offer great convenience to drivers and passengers. The moveable windows often can be operated with a single touch of a switch. Although much more convenient than a manual […]

October 9, 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. The October seminar (10226.10V – U.S.) takes a look at the GM-60470 Strut […]

October 9, 2026 —

BCM Series: Exterior and Interior Lighting

Modern vehicle lighting is no longer a collection of independent lamps controlled by simple switches. Exterior and interior lighting functions are coordinated through the infotainment display (Fig 1), the K9 […]

October 2, 2026 —

Testing for Coolant in Transmission Fluid – Watch for False Positives

Ethylene glycol from coolant in automatic transmission fluid (ATF) can be harmful to internal transmission components and affect the reliability and durability of these parts. Ethylene glycol in ATF will […]

September 29, 2026 —