Some 2018-2019 ATS, CTS, CT6, Corvette; 2018-2020 Express; 2018-2021 Camaro, Colorado, Silverado, Canyon, Savana, Sierra; and 2021 CT4 models equipped with the 8L45 or 8L90 8-speed automatic transmission (RPO M5T, […]

Using the correct fastener in a given location can’t be stressed enough when performing repairs on today’s modern vehicle designs. Here’s an example why. A recent analysis of an air […]

Some 2020 CT4, Camaro, Escalade, Tahoe, Suburban, Yukon, Silverado 1500, Sierra 1500, Express, and Savana models equipped with an 8L45, 8L90, 10L60, 10L80, or 10L90 automatic transmission (RPO M5M, MF6, […]

Transport Mode is intended for use when shipping new GM models over long distances from the assembly plant. When enabled, It reduces the parasitic electrical load on the battery when […]

Authorized U.S. dealership service department personnel can use the Pre-Repair Authorization (PRA) feature available in the Certified Service Mobile Toolbox (CSMT) application (Fig. 1) to request GM pre-approval for warranty […]

The popular Xccelerate mobile application is now available to all U.S. dealership technicians and service managers enrolled in the Mark of Excellence (MOE) program. Launched earlier this year as a […]

A software update for the EL-50332 EV/HEV Battery Service and Depowering Tool (Fig. 10) is now available through the Special Tools and Software Updates link in GM GlobalConnect.   Fig. […]

An SD Card Error message may be displayed on the infotainment screen if the navigation SD card is improperly ejected from the card slot (Fig. 12) on 2020 Buick Encore, […]

Engine lubrication on all 2019-2020 Silverado 1500 and Sierra 1500 trucks is supplied by a variable displacement oil pump. An oil control solenoid valve, controlled by the Engine Control Module […]

A whining, growling or grinding sound may be heard on some 2017-2019 Colorado and Canyon models during acceleration or deceleration when traveling from 20 mph (32 km/h) to highway speeds. […]

Some 2019-2020 Silverado 1500 and Sierra 1500 models equipped with the 2.7L engine (RPO L3B) may have DTCs P06DA (Engine Oil Pressure Control Solenoid Valve Control Circuit), P06DB (Engine Oil […]

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 […]

An Over-The-Air (OTA) update for the 2020 Corvette was sent out recently that changed the Body Control Module (BCM) calibration for opening the hood, or front trunk, (Fig. 2) using […]