2025 Cadillac VISTIQ TAC Action Center
The GM Technical Assistance Center (TAC) has established a TAC Action Center for U.S. dealerships to provide product feedback on the all-new 2026 Cadillac VISTIQ. (Fig. 14) Fig. 14 […]
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 look at trailer lighting and braking operation. […]
Dealer Case Management Tips for TCSC Submissions
Technicians can use Dealer Case Management (DCM) to create, view and update Techline cases in real time with the Techline Customer Support Center (TCSC), reducing the time spent waiting on […]
EVAP System on the New 1.2L Engine Requires Updated Leak Test Diagnostics
The 2025 Envista, Encore GX, Trax and Trailblazer are available with the new 1.2L engine (RPO LBP). The engine configuration features E85 compatibility, which required an update to the Evaporative […]
NACS Charging Adapters Designed for Public DC Chargers Only
The North American Charging Standard (NACS) DC adapters (Tesla Supercharger adapters) (Fig. 11) that are available from GM are for use on public DC Fast Charging stations only. Fig. […]
New Feedback Process on Shipping Parts to the Warranty Parts Center
The GM Warranty Parts Center (WPC) requests the return of specific parts replaced at dealerships through the Global Warranty Management (GWM) system to better understand and help resolve product issues […]
FSE Technician Recognition Awards – 1st Quarter 2025
The GM Field Service Engineer (FSE) Technician Recognition Awards (U.S.) celebrate the skill and dedication of dealership technicians who have recently worked with FSEs on challenging repairs. Technicians at GM […]
March 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 March GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
GDS2 Core Update Required by March 16
The GDS2 core update 22.8.00900 in Techline Connect that was recently released on March 10 included various bug fixes. The update will download and install automatically upon logging into Techline […]
MDI 2 Order Lead Times Update
The EL-52100 MDI 2 is required for control module programming, configuration and setup on GM vehicles equipped with the Vehicle Intelligence Platform (VIP) electrical architecture. (Fig. 2) Fig. 2 […]
Low Oil Pressure at Idle
Low and erratic oil pressure at idle may be found on some 2024-2025 Acadia, Traverse; and 2025 Enclave models equipped with the 2.5L engine (RPO LKO). DTC P06DD (Engine Oil […]
DTCs Set Due to Wiring Harness Condition
There may be several communication DTCs set along with several Driver Information Center messages —Service Power Steering, Service StabiliTrak, Service Rear Drive, Service Restraint System — displayed on some 2020-2024 […]
Heavy Fuel Use Message
There may be a “Heavy Fuel Use” message on the Driver Information Center (DIC) (Fig. 11) at times while driving on some 2023-2025 Escalade, Silverado 1500, Tahoe, Suburban, Sierra 1500, […]
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 covers valve body repair on the 10L80 transmission. (Fig. […]
Windshield Wiper Arms Interference
2024-2025 Equinox EV and 2025 OPTIQ models feature large, overlapping windshield wipers that provide a clear view of the road ahead for drivers. If the wiper arms are not aligned […]
Roof Panel Pop Sound
When driving through an automatic car wash, a loud pop (oil canning) sound may be heard on some 2023-2025 Colorado and Canyon trucks. The pop sound may be the roof […]
Guidelines for Successful Installation of GM Accessories
Before installing a variety of GM Accessories, such as keyless entry, upsize wheels and tires, lights/cargo lamps and others, on GM vehicles, it’s important to check for vehicle compatibility, if […]
Creating a TAC Case on DCT Transmissions
When creating a Technical Assistance Center (TAC) case using the Dealer Case Management (DCM) system on a 2020-2025 Corvette with a Direct Clutch Transmission (DCT) (Fig. 19) performance or leak […]
Print Edition
Previous Articles
CX Connect Case Creation Tips
New Diagnostic Strategy: Reprogram Control Modules Before Replacement
Corvette Center Console Latch Pushbutton Replacement
New Dash Cover Addresses Windshield Glare
The Info on Dealer Information — Choosing the Right Contact for Service Department Concerns
GM Service Know-How Emerging Issues
Learn More About CX Connect – New System Going Live Soon
Techline Connect & GDS2 Split Update Released
Poor A/C Performance Due to Loss of Refrigerant
Loss of A/C and Warm Air Conditions
July Service Newsletter from the Experts at GM TAC
Power Hood Closure Conditions
Diesel Engine Oil Cooler Seal Leak
Check Grounds for No Start Condition
Battery Cable Clamp Alignment Results in Low Voltage
Upper Body Auxiliary Lamp Connection
Anti-Chip Coating Appearance on Full-Size Trucks
GM Service Know-How Emerging Issues
OneCRM and Dealer Case Management System Migration
DCA-8000
Troubleshooting
Guide
TAC Newsletter September 2025
TAC Newsletter August 2025
Techline Connect Tips November 2024
CX Connect Case Creation Help + Tips and Tricks
