GM requires that technicians document the causal Diagnostic Trouble Code (DTC) that leads them to a vehicle warranty repair. The DTC is to be documented in the “Cause Comments” section […]

Techline Connect (TLC) is GM’s latest tool to bring diagnostic information and vehicle data to technicians in one easy-to-use application. With all the information that is available through TLC, the […]

New updated software for the GE-50300-A R1234yf A/C Machine (Fig. 25) is now available to be downloaded through the Special Tools and Software Updates app in GM GlobalConnect. The software […]

A Service Park Assist message may be displayed on the Driver Information Center or the power liftgate may not be operating on some 2017-2020 Acadia and 2019-2020 Blazer models. The […]

The 2020 Sierra 2500HD/3500HD may have a whistling sound coming from the front of the vehicle while driving. (Fig. 29) The intermittent sound is most commonly heard when the vehicle […]

GM ToolNet, the new asset management application to help GM dealerships in organizing and managing their special service tools inventory, will be launched April 14, 2020. Developed by Bosch Corporation, […]

The monthly GM Service Know-How Emerging Issues seminars provide service/technical information on current issues and GM certified repairs. The latest service topics from GM Brand Quality and Engineering covered in […]

Warranty replacement of wheels, seat covers and cushions, outside mirror assemblies, steering wheels, and interior door trim requires GM pre-authorization before repairs are made (U.S.). The Pre-Repair Authorization (PRA) process […]

The Active Fuel Injector Tester (AFIT), R1234yf A/C Machine, Pico Scope NVH Tool, and TPMS and RF Tool are just a few of the special service tools that require occasional […]

Fluid may be noticed leaking from the front of some 2019 XTS, Impala and Acadia models equipped with the 6T70, 6T75 or 6T80 automatic transmission (RPO MHM, M7U, M7W, M7V). […]

Some 2019-2020 Blazer, Impala and Acadia models equipped with the 2.5L 4-cylinder engine (RPO LCV) and 2019-2020 Equinox and Terrain models equipped with the 2.0L 4-cylinder engine (RPO LTG) may […]

There may be several audio conditions, including loss of audio, loss of chime, loss of turn signal indicator sound, low or no audio from a speaker channel, or abnormal speaker […]

Some 2016-2019 Envision models may have a Service Driver Assist message displayed on the Driver Information Center along with an inoperative Lane Departure Warning actuator in the Safety Alert Seat […]

The Advanced Trailering System available on the 2019-2020 Silverado 1500 and 2020 Silverado HD (Fig. 18) and the ProGrade Trailering System available on the 2019-2020 Sierra 1500 and 2020 Sierra […]