The GM Warranty Parts Center (WPC) has introduced a new part photo return process for parts replaced under warranty (U.S. only). The new process can help reduce the cost and […]
In the new Technician Excellence Program (U.S.), enrolled GM dealership service technicians can earn quarterly earnPOWER points based on their certifications across 11 service categories. (Fig. 6) Technicians are recognized […]
The GM Technical Assistance Center, or TAC, (U.S.) has established an Action Center for the all-new 2022 HUMMER EV. (Fig. 8) Fig. 8 TAC Action Centers are designed […]
The Super Cruise hands-free driver-assistance technology (RPO UKL) is now available on 2021-2022 Escalade, CT4, CT5; 2022 XT6, Bolt EUV, Silverado 1500, Sierra 1500 and HUMMER EV Pickup. The advanced […]
Some 2021-2022 Corvettes equipped with the Z51 Performance Package (Fig. 1) may have a brake pulsation or grinding sound when applying the brakes. There also may be a pitting condition […]
After replacing the wiring harness on the Diesel Exhaust Fluid (DEF) tank on some 2020-2022 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax diesel engine (RPO L5P), […]
The power liftgate actuators (Fig. 7) from some 2018-2022 Acadia, XT5 and 2020-2022 XT6 models that have been returned to the Warranty Parts Center show damage due to improper removal. […]
Some 2021-2022 Equinox and Terrain models equipped with the 1.5L engine (RPO LYX) may have an intermittent no crank condition, but the vehicle powers up normally. If the intermittent power […]
The instrument panel on 2021-2022 Envision models features ambient LED lighting. The chrome edge of the instrument panel surrounding the left and center sections illuminate with a thin light strip. […]
The latest software update (CH-47976-SWV16) for the CH-47976 Active Fuel Injection Tester (AFIT) has recently been released. The software update includes: 2023 model year database V19.00 updates for all vehicle […]
As a rule of thumb, tire pressure will change about 7 kPa (1 psi) for every 6°C (10°F) change in temperature – dropping when it gets colder outside and rising when it […]
In extremely cold weather conditions (0°F / –18°C or less), the charge air cooler (CAC) on some turbocharged engines may experience icing due to moisture build-up, restricting air flow and […]
Some 2017-2021 Acadia, XT5; 2018-2021 Enclave, Traverse; 2019-2021 Blazer; and 2020-2021 XT6 models equipped with the 2.0L engine (RPO LSY, LTG), 2.5L engine (RPO LCV) or 3.6L engine (RPO LFY, […]
For the 2022 model year, several changes have been made to the features of the Rear Seat Infotainment (RSI) system on Tahoe, Suburban, Yukon and Escalade models. (Fig. 17) These […]
Update – Midtronics DCA-8000 Diagnostic Charger is the Only Accepted Battery Tester for Warranty Battery Replacement (U.S.)
Rear Leaf Spring Noise and Possible Fuel Contamination
2027 Bolt State of Charge and NACS Charging Tips
Fuse F17UA and Possible No Start Condition
Inoperative PTO on Silverado Medium-Duty Trucks
Create Custom Data Lists in GDS 2
Updated Transfer Case Input Shaft Seal Installation
A/C Leak Detection Dye for EVs
When and Why to Use Fuel Additives
GM Service Know-How Emerging Issues
Check 55-Way Connector if Glow Plug DTCs are Set
Setting Up Wired and Wireless MDI 2 Connections
MDI 2 Advanced Setup Technical Tips Update
April Service Newsletter from the Experts at GM TACDCA-8000
Troubleshooting
Guide
TAC Newsletter April 2026
TAC Newsletter March 2026
MDI-2 Connections and Advanced Setup 2026
CX Connect Case Creation Help + Tips and Tricks
The new 1.2L engine (RPO LBP), introduced in the 2025 Envista, Encore GX, Trax and Trailblazer, features E85 compatibility. As part of the updates to the Evaporative Emission (EVAP) system, […]
With the MDI Manager application software, the MDI 2 can be configured to communicate with a PC using several possible networks, such as a USB cable, ethernet cable, Wireless Local […]
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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