Window Indexing After Loss of Vehicle Power
When opening the doors with the side windows fully closed on all HUMMER EV models, window indexing automatically lowers the window a small amount. Once the door is closed, the […]
Transmission Park Lock Position Sensor Measurement
Some 2020-2024 Corvettes may have a no start condition or the vehicle may not shut down. In some cases, these conditions may lead to a drained battery. There also may […]
2024 Blazer EV Shows Off New Technology
The 2024 Blazer EV is the latest addition to the GM electric vehicle lineup that is athletic and aggressive in both styling and performance. But it also features some exciting […]
Diagnose Non-GM Vehicles with the TechPRO Professional Aftermarket Diagnostic App
The MAHLE TechPRO Professional Aftermarket Diagnostics application (Fig. 9) was recently introduced by GM Customer Care and Aftersales to help U.S. dealerships with diagnosing non-GM vehicles. The diagnostic app provides […]
HUMMER EV 37-Inch Tires Calibration
HUMMER EV trucks feature standard 35-inch tires that are specially engineered to deliver outstanding traction and towering ground clearance. (Fig. 12) In addition, the pickup can fit tires up to […]
Side Obstacle Detection Module Installation
The Rear Cross Traffic Alert and/or Side Blind Zone Alert system (Fig. 14) on some 2021-2023 Tahoe, Suburban, Yukon and Escalade models may not detect certain vehicles. A “system unavailable” […]
6-Speed Automatic Transmission Oil Filter and Seal Now Available Individually
A change has been made to the Transmission Oil Filter and Seal Kit (part number 24236933) (Fig. 18) for the 6L50 (RPO MYB), 6L80 (RPO MYC) and 6L90 (RPO MYD) […]
Wheel Drive Shaft Damage
Damage to the wheel drive shaft threads (Fig. 1 and 2) may occur if power tools are used to remove the wheel drive shaft nut on some 2021-2023 XT5, XT6, […]
Shift Concerns on 8-Speed Transmissions
The 8-speed automatic transmissions (RPO M5N, MNU, M5U, M5X, MHA, M5T, MQE, MQD) in some 2015-2018 Corvette; 2015-2020 Escalade, Yukon; 2015-2023 Silverado 1500, Sierra 1500; 2016-2018 CTS; 2016-2019 ATS, CTS; […]
Loose Connection at Connector X175
A number of powertrain DTCs may be set along with an illuminated Check Engine MIL on some 2023-2024 Colorado, Canyon; 2024 Silverado 1500 and Sierra 1500 models equipped with the […]
November 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 November GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
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 the new 2024 Corvette E-Ray. […]
2024 Mark of Excellence Program Enrollment Extended
The Mark of Excellence program (U.S.) recognizes the achievements, professionalism, and commitment of GM dealership personnel, including those in the service department. Service technicians enrolled in the 2024 program who […]
12-Volt Battery Service in EVs
GM Electric Vehicles (EV), such as the LYRIQ, Blazer EV and Silverado EV, are equipped with a high-voltage battery system for vehicle propulsion and a 12V battery system that is […]
Front Fascia and Headlamp Adjustment
The paint may have chipped or peeled on the front fascia or fender-to-fascia body seam on some 2020-2024 Corvettes. (Fig. 9) The paint chip may be due to the headlamp […]
October 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 October GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
Print Edition
Previous Articles
Water Leak on Front Passenger Floor
Power Lines Affecting Electrical System of Upfitted Vehicles
Search TAC Resolutions in CX Connect
GM Service Know-How Emerging Issues
Inoperative Sunroof Due to Air Deflector Clips
Headlamp Cooling Fan Humming Sound
September Service Newsletter from the Experts at GM TAC
Faster Case Response Times in CX Connect
Ground Fault at the Transmission Case
Sunshade Lamp Supply Circuit Draw
Transmission Park Lock Valve Parts Released
Automatic Transmission Fluid Appearance and Color
DCA-8000
Troubleshooting
Guide
TAC Newsletter October 2025
TAC Newsletter September 2025
Techline Connect Tips November 2024
CX Connect Case Creation Help + Tips and Tricks
