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 […]
Enhancing Diagnostic Accuracy with Thermal Imaging — New Essential Tool Shipping to Dealerships
Thermal imaging was once reserved for specialty diagnostics, but it’s now becoming an accessible and valuable tool in dealership service bays. The GM-60503 Thermal Imaging Camera, a new GM Essential […]
EV Reduced Acceleration Conditions
A reduced acceleration message may be displayed along with limited propulsion power under certain operating conditions on some 2022-2026 HUMMER EV, BrightDrop models; 2023-2026 LYRIQ; 2024-2026 Blazer EV, Silverado EV, […]
Incorrect Brake Pedal Position Sensor Signal Input
Some 2012-2019 Cruze; 2012-2020 Regal; and 2012-2025 Malibu, Equinox and Terrain models may experience low or reduced power under acceleration. DTCs P057B (Brake Pedal Position Sensor Performance), P057C (Brake Pedal […]
Serial Data Authentication Configuration After Programming a Control Module
After replacing a module on a GM model equipped with the Vehicle Intelligence Platform (VIP), several possible concerns may occur. These include: Serial Data Authentication Configuration fails to complete. DTC […]
August 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 August GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
CX Connect Case Creation Tips
The new CX Connect platform (U.S. only), the dealer-facing case system that replaces Dealer Self-Service (DSS) and Advisor Workbench/Siebel, changes how technicians manage all case types to the Technical Assistance Center […]
New Diagnostic Strategy: Reprogram Control Modules Before Replacement
As Over-the-Air (OTA) updates and Vehicle-Wide-Programming become more commonplace on GM vehicles, a new diagnostic strategy is being implemented to better address performance concerns related to control module updates and […]
Corvette Center Console Latch Pushbutton Replacement
The center console compartment release button on some 2023-2025 Corvette models (Fig. 3) may become stuck in the depressed position or may extend out of the console compartment. If these […]
New Dash Cover Addresses Windshield Glare
While driving into direct sunlight or under street lights at night, some drivers of 2024-2025 Equinox EV models (Fig. 7) may notice glare from the dash reflected onto the windshield. […]
The Info on Dealer Information — Choosing the Right Contact for Service Department Concerns
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) […]
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 how to diagnose HVAC leaks. (Fig. 13) […]
Learn More About CX Connect – New System Going Live Soon
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. […]
Techline Connect & GDS2 Split Update Released
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 […]
Poor A/C Performance Due to Loss of Refrigerant
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 […]
Loss of A/C and Warm Air Conditions
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 […]
July 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 July GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
Power Hood Closure Conditions
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 […]
Diesel Engine Oil Cooler Seal Leak
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 […]
Check Grounds for No Start Condition
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 […]
Battery Cable Clamp Alignment Results in Low Voltage
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 […]
Upper Body Auxiliary Lamp Connection
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 […]
Anti-Chip Coating Appearance on Full-Size Trucks
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 […]
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 covers installing the accessory puddle lamps on the ESCALADE […]
OneCRM and Dealer Case Management System Migration
GM dealer support teams, including TAC, TCSC, DBC and others, will be going through training for the new flagship case management system OneCRM on July 7–18. We apologize for any […]
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Previous Articles
Prelube Procedure Required Before Drive Belt Installation During Engine Replacement
New GM STC Program Guide Goes Digital, Offers Easy Navigation to the Latest Training Information
Identify Parts Before Shipping to the WPC
Follow the Links – Check Service Information for All the Details on Every Repair
Performing the Long Range Radar Sensor Module Learn Procedure
Enclave Front License Plate Bracket Installation
June Service Newsletter from the Experts at GM TAC
SPS Events Soon to Require Hard-Wired Connection to MDI 2
Techline Connect App Resources Now on Global Connect
Windows 10 Support Ending Soon
Multiple DTCs Set Due to Wiring Harness Damage
GM Service Know-How Emerging Issues
DCA-8000
Troubleshooting
Guide
TAC Newsletter August 2025
TAC Newsletter July 2025
Techline Connect Tips November 2024
CX Connect Case Creation Help + Tips and Tricks
