The available Precision Package (RPO V8V) on 2025-2026 CT5-V Blackwing models is a track-focused chassis package that is designed to enhance the dynamic performance of the vehicle on the road […]
Starting March 18, 2026, GM TAC is launching a new phone prompt experience to help route calls from technicians seeking assistance more quickly. Fig. 2 Enter TAC Case […]
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 diagnostic tips for the power hood on Silverado […]
A harsh garage shift into Drive or Reverse may be noticed on some 2025-2026 Envista and Trax models equipped with the 6T40 automatic transmission (RPO MNK, MNH). The shift issue […]
The headlamps, Daytime Running Lamps (DRL), parking lamps and/or turn signals may be intermittently inoperative on some 2024-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks. (Fig. 1) Lighting operation may recover […]
Some 2022-2026 Silverado 1500, Sierra 1500; 2024-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD models equipped with the Surround Vision Cameras may have a front-view or rear-view camera display (Fig. 4) that […]
The driver’s and front passenger’s heated and ventilated seats may be inoperative on some 2021-2026 XT5 and XT6 models. (Fig. 7) Fuse F19RA also may be open. These conditions may […]
The rear half shaft boot on the left side of some 2021-2025 Tahoe, Suburban, Yukon and Escalade models may be leaking or damaged. The damage may have occurred due to […]
The latest diagnostic assistance from the professionals at the GM Technical Assistance Center is now available in the February GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
The return of the Chevrolet Bolt brings faster charging capability, longer range, a redesigned interior, enhanced technology, including Super Cruise, and a sporty RS trim along with the standard LT […]
A GM Technical Assistance Center (TAC) Action Center has been established for U.S. dealerships to help gather and report product feedback on the new 2027 Chevrolet Bolt. (Fig. 11) Fig. […]
GM-approved charging adapters allow electric vehicles, including 2017-2023 Bolt; 2022-2026 HUMMER EVs; 2023-2026 LYRIQ, BrightDrop; 2024-2026 Blazer EV, Equinox EV, Silverado EV, Sierra EV; 2025-2026 OPTIQ, CELESTIQ, ESCALADE IQ/IQL; and […]
IMPORTANT: The next CX Connect release has been delayed until Thursday, February 26, 2026. The latest CX Connect release (February 2026) includes multiple enhancements and updates that are designed to […]
The monthly GM Service Know-How Emerging Issues seminars provide service/technical information on current issues and GM-certified repairs. This month the seminar takes a closer look at DEF contamination in diesel […]
Update – Midtronics DCA-8000 Diagnostic Charger is the Only Accepted Battery Tester for Warranty Battery Replacement (U.S.)
Rear Leaf Spring Noise and Possible Fuel Contamination
2027 Bolt State of Charge and NACS Charging Tips
Fuse F17UA and Possible No Start Condition
Inoperative PTO on Silverado Medium-Duty Trucks
Create Custom Data Lists in GDS 2
Updated Transfer Case Input Shaft Seal Installation
A/C Leak Detection Dye for EVs
When and Why to Use Fuel Additives
GM Service Know-How Emerging Issues
Check 55-Way Connector if Glow Plug DTCs are Set
Setting Up Wired and Wireless MDI 2 Connections
MDI 2 Advanced Setup Technical Tips Update
April Service Newsletter from the Experts at GM TACDCA-8000
Troubleshooting
Guide
TAC Newsletter April 2026
TAC Newsletter March 2026
MDI-2 Connections and Advanced Setup 2026
CX Connect Case Creation Help + Tips and Tricks
The new 1.2L engine (RPO LBP), introduced in the 2025 Envista, Encore GX, Trax and Trailblazer, features E85 compatibility. As part of the updates to the Evaporative Emission (EVAP) system, […]
With the MDI Manager application software, the MDI 2 can be configured to communicate with a PC using several possible networks, such as a USB cable, ethernet cable, Wireless Local […]
Take a detailed look at a wide range of innovative features and advanced systems found on GM vehicles to gain a better understanding of proper operation. Each short video reviews how a feature works, highlights operating tips and shows ways to customize settings, if applicable.
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