New high-voltage battery packs for 2022-2026 HUMMER EVs, BrightDrop EVs; 2024-2026 Silverado EV, Sierra EV; and 2025-2026 ESCALADE IQ models are now shipped to the dealership without the rear ground […]
Water may be found on the front passenger floor of some 2024-2026 Equinox EV and 2025 OPTIQ models. The water leak may be caused by an unseated A/C drain tube […]
A hesitation or misfire sensation may be felt in some upfitted 2023-2025 Express and Savana vehicles when passing below high-voltage power lines. The following DTCs may be set in the […]
TAC resolutions are now available in the CX Connect knowledge hub. Here’s how to access and search the resolutions database. Accessing TAC Resolutions To access dealer resolutions, navigate to the […]
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 10L80 transmission valve body repair. (Fig. 14) […]
The sunroof may not be operating properly and/or the sunroof air deflector may not be functioning properly on some 2017-2023 Acadia (Fig. 1); 2018-2023 Enclave, Traverse; and 2024 Enclave and […]
A humming or buzzing sound may be heard coming from the front of some 2025 Tahoe, Suburban, Yukon and Escalade models. (Fig. 4) The sound may be the headlamp mounting […]
The latest diagnostic assistance from the professionals at the GM Technical Assistance Center is now available in the September GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
To avoid wait times for technical support in the dealership, prior to contacting the GM Technical Assistance Center (TAC) and Techline Customer Support Center (TCSC) as well as and other […]
Some 2025-2026 Equinox and Terrain models equipped with the VT40 transmission (RPO MRQ) may have a no start condition with DTCs P27EC (Transmission Range Control Valve Position Sensor Circuit Performance) […]
Some 2025-2026 Tahoe, Suburban, Yukon and Escalade models may experience a low or dead battery. During battery draw diagnostics, a 550 ma draw may be found, and which can be […]
Park lock valve-related faults on 2020-2025 Corvette models were previously repaired by replacing the transmission assembly (RPO M1L, M1M, MLH). Parts and service procedures are now available for servicing the […]
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; […]
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 […]
BCM Series: Content Theft Deterrent System
Return All Transmission-Related Parts to the WPC
New Body Control Module Series: Unlocking Keyless Entry Functions
GM Service Know-How Emerging Issues
Record Serial Numbers for Removed and Installed Components Under Certain Labor Operations
Control Module Reprogramming Selection Now Required in SPS
Becoming a World Class Technician – New Certification Requirements Coming in 2028
Ethernet Cable Overlay for Telematic Control Module Interference
August Service Newsletter from the Experts at GM TAC
Inoperative Engine Cooling Fan
Transmission Stuck in 1st Gear
Gear Shift Control Module Contamination
New GM Parts Connect Delivers Smarter, Faster Parts Lookup
GM Service Know-How Emerging IssuesTAC Newsletter September 2026
TAC Newsletter August 2026
DCA-8000
Troubleshooting
Guide
MDI-2 Connections and Advanced Setup 2026
CX Connect Case Creation Help + Tips and Tricks
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, […]
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 […]
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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