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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 — […]
The GM Accessories Outside Rearview Mirror Housing Cover Package available on 2021-2027 Tahoe, Suburban, Yukon and Escalade requires removing the mirror glass from the current mirror housing before installing the […]
Open a door without pressing the Unlock button on the Remote Keyless Entry transmitter when the Content Theft Deterrent system is armed and the vehicle alarm will quickly let you […]
Returning all related parts and components from a transmission repair to the Warranty Parts Center (WPC) is critical to determining the root cause of an issue. (Fig. 10) Key stakeholders […]
BCM Series: Content Theft Deterrent System
Return All Transmission-Related Parts to the WPC
New Body Control Module Series: Unlocking Keyless Entry Functions
GM Service Know-How Emerging Issues
Record Serial Numbers for Removed and Installed Components Under Certain Labor Operations
Control Module Reprogramming Selection Now Required in SPS
Becoming a World Class Technician – New Certification Requirements Coming in 2028
Ethernet Cable Overlay for Telematic Control Module Interference
August Service Newsletter from the Experts at GM TAC
Inoperative Engine Cooling Fan
Transmission Stuck in 1st Gear
Gear Shift Control Module Contamination
New GM Parts Connect Delivers Smarter, Faster Parts Lookup
GM Service Know-How Emerging IssuesTAC Newsletter September 2026
TAC Newsletter August 2026
DCA-8000
Troubleshooting
Guide
MDI-2 Connections and Advanced Setup 2026
CX Connect Case Creation Help + Tips and Tricks
GM has recently established a new air conditioning refrigerant leak diagnostic procedure for GM EVs and PHEVs — including the Silverado EV, Blazer EV, Equinox EV, Bolt EV/EUV, Corvette E-Ray, […]
The latest update to GDS 2 in Techline Connect provides technicians with the ability to build personalized data parameter lists tailored for specific diagnostic sessions — identifying only the data […]
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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