TechLink

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 […]

November 6, 2025 —

DCT Transmission Auxiliary Pump Cavitation

Some 2024-2026 Corvette E-Ray models may have a Service Transmission message displayed on the Driver Information Center along with an illuminated Check Engine MIL. DTCs P1955 (Transmission Fluid Pressure Relief […]

October 30, 2025 —

Media Source Randomly Switching to Paired Device

The infotainment system (RPO IVD, IVE) on some 2023-2026 LYRIQ, Colorado; 2024-2026 XT4, Blazer EV, Equinox EV, Silverado EV, Traverse, Acadia; 2025-2026 Enclave, Envision, CELESTIQ, CT5, Escalade, ESCALADE IQ, OPTIQ, […]

October 30, 2025 —

Expiration of Apps from GM App Store

Some GM App Store applications that have been downloaded to 2016-2017 ATS; 2017 XTS, Camaro, Volt; 2017-2018 CTS, Malibu; 2017-2019 Verano, XT5, Cruze, Acadia; 2017-2020 Regal, Colorado, Corvette, Impala; 2017-2021 […]

October 30, 2025 —

October 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 October GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]

October 30, 2025 —

Beware of Debris When Transferring the Intake Manifold During Replacement Engine Installation

When replacing an engine on 2026 and prior GM passenger cars and trucks due to internal damage, extreme care should be taken when transferring the intake manifold to the new […]

October 28, 2025 —

HUMMER EV Sky Panel Adjustment Tips

The 2022-2026 HUMMER EV Pickup and 2024-2026 HUMMER EV SUV offer the available Infinity Roof (RPO CC3) with four removable, transparent modular Sky Panels and a detachable front I-Bar. (Fig. […]

October 28, 2025 —

Corvette Z06, ZR1 5.5L V8 Engine Restriction

The 5.5L flat-plane crank V8 engine that powers the 2023-2026 Corvette Z06 generates 670 horsepower. Add the twin turbos on the 2025-2026 Corvette ZR1 and the engine produces 1,064 horsepower […]

October 28, 2025 —

High-Voltage Battery Pack Rear Ground Strap Bracket

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 […]

October 28, 2025 —

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 —

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 —