Automatic Transmission Fluid Appearance and Color

Automatic Transmission Fluid Appearance and Color

When servicing 8T45/50/60, 9T45/50/60/65 and 6T30/35/40/45 transmissions on 2016-2025 Malibu; 2017-2026 XT5; 2018-2026 Enclave; 2019-2026 Blazer; 2020-2022 Encore; 2020-2025 XT6; 2020-2026 Encore GX, Envista, Equinox, Trax, Acadia; 2021-2026 Envision, Trailblazer; […]

September 26, 2025
New Firewall Exclusions, Windows 10 Support Removed in Latest Dealer Infrastructure & Security Guidelines Update

New Firewall Exclusions, Windows 10 Support Removed in Latest Dealer Infrastructure & Security Guidelines Update

The latest GM Dealer Infrastructure & Security Guidelines (DISG) have been updated with recommended firewall exceptions for Techline Connect applications. (Fig. 1) The following exception has been added and needs […]

September 18, 2025
Incomplete Radio Registration Prevents Owner’s Manual Download

Incomplete Radio Registration Prevents Owner’s Manual Download

As part of the Pre-Delivery Inspection (PDI) of the 2026 ESCALADE IQ/IQL and VISTIQ, the digital Owner’s Manual should be downloaded to the infotainment system. (Fig. 3) To download the […]

September 18, 2025
New 12V Battery Ratings Chart for the 2026 Model Year

New 12V Battery Ratings Chart for the 2026 Model Year

The latest Original Equipment (OE) Battery Ratings chart for the 2026 model year is now available under the Reference Charts menu for use when testing OE batteries. (Fig. 5)   […]

September 18, 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 highlights 10L1000 transmission valve body repair. (Fig. 8)   […]

September 18, 2025
Enhancing Diagnostic Accuracy with Thermal Imaging — New Essential Tool Shipping to Dealerships

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 […]

August 29, 2025
EV Reduced Acceleration Conditions

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, […]

August 29, 2025
Incorrect Brake Pedal Position Sensor Signal Input

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 […]

August 29, 2025
Serial Data Authentication Configuration After Programming a Control Module

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 29, 2025
August Service Newsletter from the Experts at GM TAC

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 […]

August 29, 2025
CX Connect Case Creation Tips

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 […]

August 25, 2025
New Diagnostic Strategy: Reprogram Control Modules Before Replacement

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 […]

August 22, 2025
Corvette Center Console Latch Pushbutton Replacement

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 […]

August 22, 2025
New Dash Cover Addresses Windshield Glare

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. […]

August 22, 2025