TechLink

Water Leak on Front Passenger Floor

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 […]

October 17, 2025 —

Power Lines Affecting Electrical System of Upfitted Vehicles

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 […]

October 17, 2025 —

Search TAC Resolutions in CX Connect

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 […]

October 17, 2025 —

GM Service Know-How Emerging Issues

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) […]

October 17, 2025 —

TCSC Top Issues This Week

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 […]

October 15, 2025 —

Inoperative Sunroof Due to Air Deflector Clips

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 […]

September 30, 2025 —

Headlamp Cooling Fan Humming Sound

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 […]

September 30, 2025 —

September Service Newsletter from the Experts at GM TAC

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 […]

September 30, 2025 —

Faster Case Response Times in CX Connect

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 […]

September 26, 2025 —

Ground Fault at the Transmission Case

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) […]

September 26, 2025 —

Sunshade Lamp Supply Circuit Draw

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 […]

September 26, 2025 —

Transmission Park Lock Valve Parts Released

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 […]

September 26, 2025 —

Automatic Transmission Fluid Appearance and Color

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; […]

September 26, 2025 —