Some 2024-2026 Corvette E-Ray models may have a Service Transmission message displayed on the Driver Information Center along with an illuminated Check Engine MIL. DTCs P1955 (Transmission Fluid Pressure Relief […]
The infotainment system (RPO IVD, IVE) on some 2023-2026 LYRIQ, Colorado; 2024-2026 XT4, Blazer EV, Equinox EV, Silverado EV, Traverse, Acadia; 2025-2026 Enclave, Envision, CELESTIQ, CT5, Escalade, ESCALADE IQ, OPTIQ, […]
Some GM App Store applications that have been downloaded to 2016-2017 ATS; 2017 XTS, Camaro, Volt; 2017-2018 CTS, Malibu; 2017-2019 Verano, XT5, Cruze, Acadia; 2017-2020 Regal, Colorado, Corvette, Impala; 2017-2021 […]
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 […]
When replacing an engine on 2026 and prior GM passenger cars and trucks due to internal damage, extreme care should be taken when transferring the intake manifold to the new […]
The 2022-2026 HUMMER EV Pickup and 2024-2026 HUMMER EV SUV offer the available Infinity Roof (RPO CC3) with four removable, transparent modular Sky Panels and a detachable front I-Bar. (Fig. […]
The 5.5L flat-plane crank V8 engine that powers the 2023-2026 Corvette Z06 generates 670 horsepower. Add the twin turbos on the 2025-2026 Corvette ZR1 and the engine produces 1,064 horsepower […]
New high-voltage battery packs for 2022-2026 HUMMER EVs, BrightDrop EVs; 2024-2026 Silverado EV, Sierra EV; and 2025-2026 ESCALADE IQ models are now shipped to the dealership without the rear ground […]
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 […]
Water may be found on the front passenger floor of some 2024-2026 Equinox EV and 2025 OPTIQ models. The water leak may be caused by an unseated A/C drain tube […]
A hesitation or misfire sensation may be felt in some upfitted 2023-2025 Express and Savana vehicles when passing below high-voltage power lines. The following DTCs may be set in the […]
TAC resolutions are now available in the CX Connect knowledge hub. Here’s how to access and search the resolutions database. Accessing TAC Resolutions To access dealer resolutions, navigate to the […]
The monthly GM Service Know-How Emerging Issues seminars provide service/technical information on current issues and GM-certified repairs. This month the seminar reviews 10L80 transmission valve body repair. (Fig. 14) […]
The sunroof may not be operating properly and/or the sunroof air deflector may not be functioning properly on some 2017-2023 Acadia (Fig. 1); 2018-2023 Enclave, Traverse; and 2024 Enclave and […]
A humming or buzzing sound may be heard coming from the front of some 2025 Tahoe, Suburban, Yukon and Escalade models. (Fig. 4) The sound may be the headlamp mounting […]
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 […]
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
New Firewall Exclusions, Windows 10 Support Removed in Latest Dealer Infrastructure & Security Guidelines Update
Incomplete Radio Registration Prevents Owner’s Manual Download
New 12V Battery Ratings Chart for the 2026 Model Year
GM Service Know-How Emerging Issues
Enhancing Diagnostic Accuracy with Thermal Imaging — New Essential Tool Shipping to Dealerships
EV Reduced Acceleration Conditions
Incorrect Brake Pedal Position Sensor Signal Input
Serial Data Authentication Configuration After Programming a Control Module
August Service Newsletter from the Experts at GM TACDCA-8000
Troubleshooting
Guide
TAC Newsletter October 2025
TAC Newsletter September 2025
Techline Connect Tips November 2024
CX Connect Case Creation Help + Tips and Tricks
Thermal imaging was once reserved for specialty diagnostics, but it’s now becoming an accessible and valuable tool in dealership service bays. The GM-60503 Thermal Imaging Camera, a new GM Essential […]
As Over-the-Air (OTA) updates and Vehicle-Wide-Programming become more commonplace on GM vehicles, a new diagnostic strategy is being implemented to better address performance concerns related to control module updates and […]
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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