TechLink

Harsh Garage Shift into Drive or Reverse on Envista and Trax Models

A harsh garage shift into Drive or Reverse may be noticed on some 2025-2026 Envista and Trax models equipped with the 6T40 automatic transmission (RPO MNK, MNH). The shift issue […]

March 9, 2026 —

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 […]

March 5, 2026 —

Intermittent Front Lighting Operation

The headlamps, Daytime Running Lamps (DRL), parking lamps and/or turn signals may be intermittently inoperative on some 2024-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks. (Fig. 1) Lighting operation may recover […]

February 28, 2026 —

Loss of Reverse/Forward Grid Lines in Camera View

Some 2022-2026 Silverado 1500, Sierra 1500; 2024-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD models equipped with the Surround Vision Cameras may have a front-view or rear-view camera display (Fig. 4) that […]

February 28, 2026 —

Inoperative Heated and Ventilated Front Seats

The driver’s and front passenger’s heated and ventilated seats may be inoperative on some 2021-2026 XT5 and XT6 models. (Fig. 7) Fuse F19RA also may be open. These conditions may […]

February 28, 2026 —

Brake Pad Wear Sensor Contact with Rear Half Shaft

The rear half shaft boot on the left side of some 2021-2025 Tahoe, Suburban, Yukon and Escalade models may be leaking or damaged. The damage may have occurred due to […]

February 28, 2026 —

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

February 28, 2026 —

The 2027 Chevrolet Bolt Makes Its Comeback

The return of the Chevrolet Bolt brings faster charging capability, longer range, a redesigned interior, enhanced technology, including Super Cruise, and a sporty RS trim along with the standard LT […]

February 20, 2026 —

2027 Chevrolet Bolt TAC Action Center

A GM Technical Assistance Center (TAC) Action Center has been established for U.S. dealerships to help gather and report product feedback on the new 2027 Chevrolet Bolt. (Fig. 11) Fig. […]

February 20, 2026 —

NACS and CCS1 Charging Adapter Options

GM-approved charging adapters allow electric vehicles, including 2017-2023 Bolt; 2022-2026 HUMMER EVs; 2023-2026 LYRIQ, BrightDrop; 2024-2026 Blazer EV, Equinox EV, Silverado EV, Sierra EV; 2025-2026 OPTIQ, CELESTIQ, ESCALADE IQ/IQL; and […]

February 20, 2026 —

February CX Connect Release Provides Multiple App Updates

IMPORTANT: The next CX Connect release has been delayed until Thursday, February 26, 2026. The latest CX Connect release (February 2026) includes multiple enhancements and updates that are designed to […]

February 20, 2026 —

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 takes a closer look at DEF contamination in diesel […]

February 20, 2026 —

Safety Arc-Rated Personal Protection Equipment for Electric Vehicles

Safety Arc-Rated (AR) Personal Protection Equipment (PPE) is recommended to be used by technicians when servicing some high-voltage battery packs under certain scenarios on GM electric vehicles. The PPE that […]

January 29, 2026 —

Engine Oil Capacities Chart for the 2026 Model Year

The TechLink 2026 Engine Oil Capacities chart is now available under the Reference Charts menu. The chart includes engine, RPO, specifications (liters and quarts), oil viscosity and engine oil filter […]

January 29, 2026 —