The application process of the spray-on bedliner (RPO CGN) available on Silverado 1500, Silverado 2500HD/3500HD, Sierra 1500 and Sierra 2500HD/3500HD trucks has been updated during 2026 model year production. The […]
The latest software update for the MDI 2 Manager is being rolled out to GM dealerships (U.S.) The staggered rollout of the new MDI 2 Manager software (version 9.7.3109.193) includes […]
Some 2024-2026 Silverado EV, Sierra EV; 2025-2026 ESCALADE IQ, OPTIQ, Equinox EV, HUMMER EV; and 2026 ESCALADE IQL models may have inadequate cabin heating or cooling along with a Service […]
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 […]
While the conventional horn system (Fig. 10) has been a common feature found on automobiles for decades, the pedestrian alert system is a relatively new system on hybrid and electric […]
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 […]
Let’s get the dirt on modern wiper and washer systems. These advanced systems rely on electronic controls, sensors, and BCM communication to optimize wiping performance and help maintain visibility in […]
There is more to the Mirrors system than meets the eye on many GM models. From power controls for driver and passenger outside rearview mirrors to folding, heated and memory […]
The monthly Lunch with Your Field Service Engineers meeting will take place October 21. Each one-hour meeting is held online via Microsoft Teams and offers GM dealership technicians, shop foremen […]
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 […]
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 […]
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 […]
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 […]
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 […]
BCM Series: Let’s Hear it for Horns and Pedestrian Alerts
BCM Series: Wiper and Washer Systems
BCM Series: Checking the Mirrors
Inoperative Tailgate Diagnostic Tips
BCM Series: Fixed and Moveable Windows
GM Service Know-How Emerging Issues
BCM Series: Exterior and Interior Lighting
Testing for Coolant in Transmission Fluid – Watch for False Positives
Poor Camera View from Detached Rear Camera Mounting
Rattle Sound from Windshield Area
Engine Oil Leak Between Oil Pan and Oil Cooler Adapter
Sunroof Headlining Trim Panel Rattle Sound
September Service Newsletter from the Experts at GM TAC
Closing the Feedback Loop – Engine Teardown Process at the Warranty Parts CenterTAC Newsletter October 2026
TAC Newsletter September 2026
DCA-8000
Troubleshooting
Guide
MDI-2 Connections and Advanced Setup 2026
CX Connect Case Creation Help + Tips and Tricks
The belt driven electronic power steering system on the 2020-2026 Silverado 1500 and Sierra 1500 features a belt drive and ball nut mechanism, power pack, torque sensor and a rack […]
GM has recently introduced Guided Diagnostics, a VIN-specific diagnostic application designed to help technicians follow a more focused repair path that reduces dead ends and makes troubleshooting more efficient. At […]
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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