TechLink

Inoperative Tailgate Diagnostic Tips

There may be a Tailgate Ajar message displayed on the Driver Information Center even though the tailgate is fully closed on some 2022–2026 Silverado 1500, Sierra 1500; 2024–2026 Silverado 2500/3500 […]

October 9, 2026 —

BCM Series: Fixed and Moveable Windows

Power windows offer great convenience to drivers and passengers. The moveable windows often can be operated with a single touch of a switch. Although much more convenient than a manual […]

October 9, 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. The October seminar (10226.10V – U.S.) takes a look at the GM-60470 Strut […]

October 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 […]

October 8, 2026 —

BCM Series: Exterior and Interior Lighting

Modern vehicle lighting is no longer a collection of independent lamps controlled by simple switches. Exterior and interior lighting functions are coordinated through the infotainment display (Fig 1), the K9 […]

October 2, 2026 —

Testing for Coolant in Transmission Fluid – Watch for False Positives

Ethylene glycol from coolant in automatic transmission fluid (ATF) can be harmful to internal transmission components and affect the reliability and durability of these parts. Ethylene glycol in ATF will […]

September 29, 2026 —

Poor Camera View from Detached Rear Camera Mounting

Some 2027 Bolt models may have an offset or poor view display from the rearview camera. The offset display may be from a loose rear camera mounting at the rear […]

September 29, 2026 —

Rattle Sound from Windshield Area

A rattle sound may be heard near the windshield on some 2027 Bolt models while driving over bumps at any speed. The sound may be due to a loose Windshield […]

September 29, 2026 —

Engine Oil Leak Between Oil Pan and Oil Cooler Adapter

Some 2027 Corvette models equipped with the 6.7L engine (RPO LS6) may have a small engine oil leak visible from underneath the vehicle between the oil pan and the oil […]

September 29, 2026 —

Sunroof Headlining Trim Panel Rattle Sound

Some 2023-2026 Colorado and Canyon models equipped with a sunroof (RPO CAC) may have a rattle sound from the headlining trim panel. (Fig. 17) The squeak or rattle sound may […]

September 29, 2026 —

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 29, 2026 —

Closing the Feedback Loop – Engine Teardown Process at the Warranty Parts Center

What happens when an engine replaced under warranty arrives at the Warranty Parts Center (WPC)? A new video available on Global Connect takes an inside look at the engine teardown […]

September 29, 2026 —

BCM Series: Tire Pressure Monitoring System

The Tire Pressure Monitoring System (TPMS) allows for live tire data (Fig. 13) to be transmitted from each tire and interpreted by the K9 Body Control Module (BCM). The data […]

September 25, 2026 —

BCM Series: Door Latch Actuators

The door latches, both conventional and electronic latches, on GM models are controlled by the Body Control Module (BCM). (Fig. 1) Understanding how the BCM drives door latch actuators — […]

September 18, 2026 —