The EVAP line connection style has changed on the 2020-2021 Corvette equipped with the 6.2L V8 engine (RPO LT2). If a vehicle requires the EVAP system to be tested for […]

There may not be any transmission movement after replacing the transmission valve body on some 2015-2017 Escalade, Yukon Denali; 2015-2019 Corvette; 2015-2021 Silverado, Sierra; 2016-2018 CT6; 2016-2019 ATS, CTS; 2016-2021 […]

The Head-Up Display (HUD) image (RPO UV6) on some 2020-2021 Acadia models (Fig. 21) may be tilted or not level when displayed on the windshield. The tilted image may be […]

GM has announced an updated policy for refinishing aluminum wheels under warranty at U.S. dealerships on 2011-2021 passenger cars and trucks. (Fig. 1) Only cosmetic refinishing of wheels due to […]

Misfire DTCs P0300 (Engine Misfire Detected), P0302 (Cylinder 2 Misfire Detected) or P0305 (Cylinder 5 Misfire Detected) may be set on some 2016-2019 ATS; 2016-2020 CT6; 2016-2021 Camaro; 2017-2019 LaCrosse; […]

2020-2021 Blazers equipped with the 2.0L engine (RPO LSY) may have a humming or vibration sound coming from the front of the vehicle when driving at speeds over 50 mph […]

A pop sound may heard coming from the rear roof of the cab area on some 2019-2020 Silverado 1500 and Sierra 1500 models and 2020 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD […]

The latest software update (CH-47976-SWV14) for the CH-47976 Active Fuel Injector Tester (AFIT) has recently been released. The software update includes: 2021 model year and early 2022 model year software […]

After making repairs to the Dual Clutch Transmission (RPO M1L) on 2020-2021 Corvette models, including Shift Activation (SAV), Main Control Valve (MCV) or direct clutch replacement, the Transmission Control Module […]

A drive belt squeak or engine noise from the front of the engine may be noticed on some 2016-2019 ATS, CTS, Camaro; 2016-2020 CT6; 2017-2019 LaCrosse, Acadia; 2017-2021 XT5, Colorado, […]

Some 2020-2021 Corvette models may have multiple DTCs set in the Transmission Control Module (TCM). The DTCs may be caused by an internal transmission solenoid or switch sticking due to […]

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 […]

Technicians using the GM Service Information (SI) will soon find updated Removal/Installation and Replacement procedures with more detailed steps and fewer procedure links to other SI documents. (Fig. 3) The […]