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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 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 […]
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. […]
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, […]
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 […]
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 […]
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. […]
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 […]
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 […]
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 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 […]
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Previous Articles
First-Ever 2026 Cadillac VISTIQ Debuts
New Rear Heating/Cooling System Provides 3rd-Row Comfort
Troubleshooting Tips for the DCA-8000P Diagnostic Charger
New Part Number Released for Silverado and Sierra Half Shafts
Remove Protective Films on Overhead Console During PDI on the ESCALADE IQ/IQL
Diagnostic Tips for Audio and Display Screen Concerns on IOK Radios
Required Information for Restricted IOK Radios
Power Doors OTA Update Released for 2025 Escalade
QR Code Scanning Helps Avoid Input Mistakes When Programming Modules
GM Service Know-How Emerging Issues
New TAC Response Requested Process
Keep Your Cool — Air Conditioning Refrigerant Leak Diagnostic Tips
Water Leak at the A-Pillar Body Plug
Unlatching the Front Compartment Hood with a Weak 12V Battery
Differences in Approach Lighting on Mid-Size SUVs
April Service Newsletter from the Experts at GM TAC
DCA-8000
Troubleshooting
Guide
TAC Newsletter June 2025
TAC Newsletter May 2025
Techline Connect Tips November 2024
DCM Case Submission & Best Practices Guide
