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 Midtronics DCA-8000 Diagnostic Charger (Fig. 1) is the latest generation battery charger and tester from Midtronics. It provides fast, accurate testing results and is the GM-required tool for charging […]
Some 2020-2026 Silverado 1500 and Sierra 1500 trucks equipped with the 3.0L diesel engine (RPO LM2, LZ0) may have a squeak or clunk sound coming from the rear of the […]
The new 2027 Bolt features a 65-kWh lithium iron phosphate (LFP) high-voltage battery pack, enabling faster charging. It uses a native North American Charging Standard (NACS) charging port that provides […]
A no start condition on some 2025-2026 Acadia, Traverse and Enclave models may be caused by a rear wiper motor binding or a bent wiper arm. (Fig. 16) Fuse F17UA […]
Some 2019-2023 Silverado 4500HD/5500HD/6500HD trucks may have an intermittent condition where the available Power Take-Off (PTO) is inoperative along with DTC P251A (PTO Enable Switch Circuit) set in the PTO […]
The latest update to GDS 2 in Techline Connect provides technicians with the ability to build personalized data parameter lists tailored for specific diagnostic sessions — identifying only the data […]
Seal installation depth is critical when replacing the transfer case front input shaft seal between the transmission and transfer case on 2020-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with […]
GM has recently established a new air conditioning refrigerant leak diagnostic procedure for GM EVs and PHEVs — including the Silverado EV, Blazer EV, Equinox EV, Bolt EV/EUV, Corvette E-Ray, […]
Gemini OTA Update for Google built-in
Information on 4WD Front Axle Disconnect DTCs Updated in SI
Unable to Learn Trailer TPM Sensors
New 2026 Model Year Transmission Fluid Capacities Chart
GM Service Know-How Emerging Issues
Introducing GM Parts Connect
Latest Techline Connect Update Adds Proactive Alert for Parasitic Drains to Dashboard
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 IssuesDCA-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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