Prelube Procedure Required Before Drive Belt Installation During Engine Replacement

Prelube Procedure Required Before Drive Belt Installation During Engine Replacement

If the engine for a GM model needs to be replaced with a new engine or has to be overhauled, be sure to perform the Engine Prelubing procedure as part […]

June 30, 2025
New GM STC Program Guide Goes Digital, Offers Easy Navigation to the Latest Training Information

New GM STC Program Guide Goes Digital, Offers Easy Navigation to the Latest Training Information

The new GM Service Technical College (STC) Program Guide (formally the GM STC Course Catalog) is now available on gmstc.com. The new guide has been restructured as a website to […]

June 30, 2025
Identify Parts Before Shipping to the WPC

Identify Parts Before Shipping to the WPC

Returning parts to the Warranty Parts Center (WPC) helps GM engineers, suppliers and others quality management personnel better understand and quickly resolve product issues. Technicians can help in identifying an […]

June 30, 2025
Follow the Links - Check Service Information for All the Details on Every Repair

Follow the Links – Check Service Information for All the Details on Every Repair

The GM Service Information (SI) provides the latest, most complete information available to diagnose and repair GM vehicles. The Service Information is updated regularly and includes important specifications for different […]

June 27, 2025
Performing the Long Range Radar Sensor Module Learn Procedure

Performing the Long Range Radar Sensor Module Learn Procedure

After replacing, or removing and reinstalling, the B233B Forward Range Radar Sensor on the 2024-2025 Acadia, Traverse; and 2025 Enclave, the sensor module alignment must be calibrated by performing the […]

June 27, 2025
Enclave Front License Plate Bracket Installation

Enclave Front License Plate Bracket Installation

Installation of the front license plate bracket on 2025-2026 Enclave models requires using a short drill bit to avoid damage behind the front fascia. Using a longer drill bit while […]

June 27, 2025
June Service Newsletter from the Experts at GM TAC

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

June 27, 2025
TCSC Top Issues This Week

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 […]

June 26, 2025
SPS Events Soon to Require Hard-Wired Connection to MDI 2

SPS Events Soon to Require Hard-Wired Connection to MDI 2

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. […]

June 17, 2025
Techline Connect App Resources Now on Global Connect

Techline Connect App Resources Now on Global Connect

A variety of resources covering the operation of Techline Connect (TLC) are now available on Global Connect. The new TLC App Resources page (Fig. 6) contains several helpful user guides, […]

June 17, 2025
Windows 10 Support Ending Soon

Windows 10 Support Ending Soon

Microsoft has announced it will discontinue free support of the Windows 10 operating system (OS) on October 14, 2025. The Techline Customer Support Center (TCSC) will continue to support personal […]

June 17, 2025
Multiple DTCs Set Due to Wiring Harness Damage

Multiple DTCs Set Due to Wiring Harness Damage

There may be multiple DTCs set on some 2025 Silverado 1500, Tahoe Suburban, Sierra 1500 and Yukon models equipped with the 3.0L diesel engine (RPO LZ0). The DTCs, including many […]

June 17, 2025
GM Service Know-How Emerging Issues

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 reviews loss of propulsion conditions on the L87 engine. […]

June 17, 2025
Vehicle-Wide Programming Status Summary Now Includes All Control Modules

Vehicle-Wide Programming Status Summary Now Includes All Control Modules

The Vehicle-Wide Programming (VWP) feature in Techline Connect (TLC) has been updated with several enhancements in the latest software release. VWP, which allows multiple control modules to be programmed during […]

May 30, 2025
2025 Model Year Transmission Fluid Capacities Chart

2025 Model Year Transmission Fluid Capacities Chart

A new TechLink reference chart is now available covering transmission fluid capacities. The 2025 Transmission Fluid Capacities chart can be viewed under the Reference Charts menu or by selecting the […]

May 30, 2025
Key Fob Learning on 2025 Police and Special Service Vehicles

Key Fob Learning on 2025 Police and Special Service Vehicles

The 2025 Tahoe can be equipped with special service vehicle packages for police use (RPO 9C1) (Fig. 7; shown with aftermarket equipment) and special service use (RPO 5W4).   Fig. […]

May 30, 2025
May Service Newsletter from the Experts at GM TAC

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

May 30, 2025