On some 2019 CT6; 2019-2020 XT4, Silverado, Sierra; 2020 CT4, CT5, XT5, XT6, Blazer, and Acadia models equipped with the 2.0L engine (RPO LSY) or 2.7L engine (RPO L3B), the […]

Poor heater performance may be experienced on some 2020 Silverado and Sierra models equipped with the 3.0L diesel engine (RPO LM2). The poor performance may be caused by the heater […]

Some 2020-2021 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax diesel engine (RPO L5P) may have a thumping or knocking sound coming from the rear of the […]

A GDS2 error message stating “Request Rejected by the Control Module” may occur when trying to deactivate the brake boost system while performing the hydraulic brake system bleeding procedure on […]

A Low Oil or Add Oil message may be displayed on the Driver Information Center (DIC) on some 2019 Silverado 1500, Sierra 1500; 2020-2021 Silverado 1500, Silverado 2500/3500, Sierra 1500, […]

The 2020 Encore GX and 2021 Trailblazer feature the new 1.2L turbocharged engine (RPO LIH). (Fig. 20) The engine may have a noticeable sound under certain circumstances. Fig. 20   […]

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 […]

The all-new eighth generation 2020 Chevrolet Corvette Stingray (C8) features a sleek, performance-focused design with a first-ever mid-engine configuration. (Fig. 1) The rear weight bias enables the capabilities of the […]

The all-new 2020 Corvette Stingray delivers exceptional performance through a combination of rear weight bias, aerodynamics, chassis tuning and its new mid-engine small block V8 and 8-speed dual clutch transmission […]

The Pre-Delivery Inspection (PDI) of the new 2020 Corvette Stingray includes several special inspections and installation procedures. Be sure to complete all items on the PDI form. Here are a […]

After replacing and programming the B174W Front View Camera Module (Fig. 30) on the 2020 CT5, the learn procedure using GDS2 may not be able to be started. Any of […]

After installing an accessory tonneau cover on some 2019-2020 Silverado 1500 and Sierra 1500 models and 2020 Silverado 2500HD/3500 HD and Sierra 2500HD/3500HD models, the endgate may fail to auto […]

Some 2019-2020 Colorado and Canyon models equipped with the 6L50 automatic transmission (RPO MYB) may have an intermittent slip condition or may not engage when shifted into Reverse. The intermittent […]

The latest update to the GDS2 core software (Version 21.3.06900) in TIS2Web recently released includes changes for Diagnostics over Internet Protocol (DoIP) diagnostics, new messaging for MDI 2/MDI usage on […]

The all-new 2020 Buick Encore GX (Fig. 1) is a crossover sport utility vehicle designed and manufactured globally and sold worldwide. It slots in the Buick lineup between the smaller […]

The all-new 2020 Buick Encore GX (Fig. 10) features two new, fuel efficient, turbocharged 3-cylinder engines mated to either a continuously variable transmission (CVT) or a Hydra-Matic 9-speed automatic transmission. […]

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 […]