GM has recently introduced Guided Diagnostics, a VIN-specific diagnostic application designed to help technicians follow a more focused repair path that reduces dead ends and makes troubleshooting more efficient. At […]
A Service Door Latch System message may be shown on the Driver Information Center (DIC) of some 2025-2026 Tahoe, Suburban, Yukon and Escalade models. In addition, the rear child door […]
The front Park Assist system may issue false alerts on the Driver Information Center on some 2023-2026 Silverado 1500, Sierra 1500; 2024-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks when there […]
Some 2023-2024 Equinox and Terrain models equipped with the 1.5L engine (RPO LSD) (Fig. 13) may have an illuminated Check Engine MIL and DTCs P0521 (Engine Oil Pressure Sensor Performance), […]
The GM Field Service Engineer (FSE) Technician Recognition Awards (U.S.) celebrate the skill and dedication of dealership technicians who have recently worked with FSEs on challenging repairs. Technicians at GM […]
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 […]
Google Gemini brings AI assistance to 2022-2027 Chevrolet, Buick, GMC and Cadillac models equipped with Google built-in (RPO IVE, IVD, IOK) — approximately four million vehicles in the U.S. are […]
New Diagnostic Steps Added for 4WD Front Axle Disconnect DTCs C118D, C10BA, C116F and C119C GM Engineering has identified a previously missing connector interface that requires inspection and circuit verification […]
It may not be possible to learn the Trailer Tire Pressure Monitor (TPM) sensors to some 2024-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks or the TPMS pressure readings may not […]
The latest TechLink reference chart is now available covering transmission fluid capacities for the 2026 model year. The 2026 Transmission Fluid Capacities chart can be viewed under the Reference Charts […]
The monthly GM Service Know-How Emerging Issues seminars provide service/technical information on current issues and GM-certified repairs. The June seminar (10226.06V – U.S.) takes an in-depth look at the Midtronics […]
A Preview of the New Parts Catalog Coming Soon. GM dealership service and parts operations will soon see a significant shift in how parts are identified, cataloged, and integrated into […]
The latest Techline Connect update, released on June 15, 2026, includes an enhancement to the dashboard view showing a new Proactive Alert for potential parasitic drains. (Fig. 16) Fig. […]
The monthly Lunch with Your Field Service Engineers meeting will take place June 17. The one-hour meeting will be held online via Microsoft Teams and offers GM dealership technicians, shop […]
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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