Updated Painted Aluminum Wheel Refinishing Guidelines

Updated Painted Aluminum Wheel Refinishing Guidelines

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 […]

February 26, 2021
Active Fuel Management Misfire Codes Setting on HFV6 Gen2 Engines

Active Fuel Management Misfire Codes Setting on HFV6 Gen2 Engines

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; […]

February 26, 2021
Aero Shutter Humming Sound

Aero Shutter Humming Sound

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 […]

February 26, 2021
Pop Sound at Rear Roof of Cab

Pop Sound at Rear Roof of Cab

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 […]

February 26, 2021
AFIT Software V14 Now Available

AFIT Software V14 Now Available

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 […]

February 26, 2021
Dual Clutch Transmission MCVM PUN

Dual Clutch Transmission MCVM PUN

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 […]

February 26, 2021
Water Pump Creating Engine Noise or Belt Squeak Conditions

Water Pump Creating Engine Noise or Belt Squeak Conditions

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, […]

February 26, 2021
Multiple Transmission DTCs Set

Multiple Transmission DTCs Set

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 […]

February 26, 2021
GM Service Know-How Emerging Issues

GM Service Know-How Emerging Issues

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 […]

February 26, 2021
Techline App Enhancements Coming Soon

Techline App Enhancements Coming Soon

With the retirement of TIS2Web approaching, the Techline Connect team has received significant feedback from dealership technicians. As always, technicians’ comments are taken into account when developing and supporting all […]

February 10, 2021
Updated Service Information with Easier-to-Use Format Expands to More Models for 2021

Updated Service Information with Easier-to-Use Format Expands to More Models for 2021

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 […]

February 10, 2021
Low Battery Charge After Vehicle Sits for a Short Time

Low Battery Charge After Vehicle Sits for a Short Time

Some 2021 Express and Savana vans equipped with the 6.6L V8 engine (RPO L8T) may have a low battery charge after sitting for a short period of time. The low […]

February 10, 2021
Escalade OLED Infotainment System Demo Mode

Escalade OLED Infotainment System Demo Mode

The 2021 Cadillac Escalade features the automotive industry’s first OLED (Organic Light Emitting Diode) Infotainment System. With 38 inches (965 mm) of total diagonal display area, it has twice the […]

February 10, 2021
Faulty Emission Reduction Fluid Tank Heater

Faulty Emission Reduction Fluid Tank Heater

The Emission Reduction Fluid Tank heater may be faulty on some 2020 Silverado 1500, Silverado 2500HD/3500HD, Sierra 1500, Sierra 2500HD/3500HD; 2021 Tahoe, Suburban, Yukon and Escalade models equipped with the […]

February 10, 2021
Auxiliary Transmission Oil Cooler Eliminated

Auxiliary Transmission Oil Cooler Eliminated

2021 Express and Savana models equipped with the 4.3L V6 engine (RPO LV1) or 6.6L V8 engine (RPO L8T) may have a build list that includes a V14 auxiliary transmission […]

February 10, 2021
Exhaust Odor in Cabin or Engine Compartment

Exhaust Odor in Cabin or Engine Compartment

An exhaust odor in the cabin or in the engine compartment may be noticed on some 2020-2021 Silverado and Sierra models and 2021 Tahoe, Suburban, Yukon, and Escalade models, equipped […]

February 10, 2021
Misfire Due to Collapsed Lifter

Misfire Due to Collapsed Lifter

Some 2019-2021 Silverado, Sierra; 2021 Tahoe, Suburban, Yukon and Escalade models equipped with the 5.3L V8 engine (RPO L84) or 6.2L V8 engine (RPO L87) may have a misfire condition […]

February 10, 2021