The Tremec DCT TR9080 dual clutch transmission (RPO M1L, M1M) on 2020-2023 Corvettes features a transmission canister filter (Fig. 3) that should be replaced at the initial 7,500-mile (12,000-km) maintenance […]
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 air spring repairs on full-size SUVs. (Fig. 7) […]
Several communication DTCs may be set on some 2022 Silverado 1500, Tahoe, Suburban, Sierra 1500, Yukon and Escalade models equipped with the 3.0L Duramax diesel engine (RPO LM2). Along with […]
Proper timing chain installation on the High Feature V6 engine (RPO LGX, LGZ, LGY, LGW) requires confirming the location of the green-colored chain links. In order to get a proper […]
A squeak or click sound may be heard coming from the front of some 2019-2022 Silverado 1500, Sierra 1500; 2021-2022 Tahoe, Suburban, Yukon and Escalade models equipped with all-wheel drive/four-wheel […]
The Side Blind Zone Alert indicator on some 2021-2023 CT4, CT5, Escalade, Tahoe, Suburban and Yukon models equipped with Super Cruise (RPO UKL or UKL and 00U/02O) may not operate […]
The latest diagnostic assistance from the professionals at the GM Technical Assistance Center is now available in the January GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
In order to help GM Engineering identify the root cause and troubleshoot some component drains or logic lockups on 2000-2023 GM passenger cars and trucks, it’s critical that power to […]
During diagnosis or repairs of the transfer case (RPO NQF) on some 2019-2023 Silverado MD 4500/5500/6500 models equipped with four-wheel drive, the transfer case learn procedure may not be completed […]
Some 2021-2022 Envision, CT4, CT5, XT4, XT5, XT6, Blazer and Acadia models equipped with the 2.0L 4-cylinder engine (RPO LSY) may have DTC P0299 (Engine Underboost) set in the Engine […]
The Vehicle Intelligence Platform (VIP) electrical architecture continues to power a growing number of new GM vehicles for the 2023 model year. The VIP architecture offers enhanced capacity and the […]
A Service Power Steering message may be displayed on the Driver Information Center on some 2017-2023 XT5, Acadia; 2018-2023 Enclave, Traverse; 2019-2023 Blazer; and 2020-2023 XT6 models. DTC P0128 (Engine […]
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 look at the role of the Field […]
The new GM Dealer Infrastructure & Security Guidelines (DISG) are now available to help dealers with the technology needed to ensure reliable data communications, including recommended personal computer (PC) specifications. […]
The latest diagnostic assistance from the professionals at the GM Technical Assistance Center is now available in the December GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
The new 2023 GM Service Technical College (STC) Course Catalog (U.S.) is now available. (Fig. 6) The new catalog can be accessed through the Service Technician Training, Recruiting, Retention, and […]
Water Leak on Front Passenger Floor
Power Lines Affecting Electrical System of Upfitted Vehicles
Search TAC Resolutions in CX Connect
GM Service Know-How Emerging Issues
Inoperative Sunroof Due to Air Deflector Clips
Headlamp Cooling Fan Humming Sound
September Service Newsletter from the Experts at GM TAC
Faster Case Response Times in CX Connect
Ground Fault at the Transmission Case
Sunshade Lamp Supply Circuit Draw
Transmission Park Lock Valve Parts Released
Automatic Transmission Fluid Appearance and ColorDCA-8000
Troubleshooting
Guide
TAC Newsletter October 2025
TAC Newsletter September 2025
Techline Connect Tips November 2024
CX Connect Case Creation Help + Tips and Tricks
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) […]
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 […]
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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