Checking for Exhaust System Leaks

Checking for Exhaust System Leaks

Several DTCs set in the Engine Control Module (ECM) may be caused by an exhaust leak on some 2020-2022 Silverado 1500, Sierra 1500; 2021-2023 Tahoe, Suburban, Yukon and Escalade models […]

September 27, 2022
Incorrect Headlamp and DRL Operation Condition

Incorrect Headlamp and DRL Operation Condition

The headlamps may be turning on automatically during daylight conditions instead of the Daytime Running Lamps (DRL) on some 2022 Tahoe, Suburban, Yukon, Escalade and 2022-2023 Corvette models. (Fig. 6) […]

September 27, 2022
Wheel Speed Sensor Inspection

Wheel Speed Sensor Inspection

Some 2019-2022 Silverado 4500HD/5500HD/6500HD models may an illuminated ABS, traction control and/or brake warning MIL along with several DTCs set. These conditions may be due to an out-of-adjustment wheel speed […]

September 27, 2022
September Service Newsletter from the Experts at GM TAC

September Service Newsletter from the Experts at GM TAC

The latest diagnostic assistance from the professionals at the GM Technical Assistance Center is now available in the September GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]

September 27, 2022
Fine Tune Service Information Searches with RPO Data

Fine Tune Service Information Searches with RPO Data

Technicians navigating in Service Information (SI) using the year, make and model (YMM) of a vehicle are used to seeing all service manual content for that vehicle displayed — that […]

September 20, 2022
Duramax Diesel Engine Oil Filter Update for 2023

Duramax Diesel Engine Oil Filter Update for 2023

The PF63 engine oil filter (Fig. 5) is the new recommended filter specification for 2020-2023 Silverado 2500HD/3500HD, Sierra 2500HD/3500HD, Express, Savana; and 2019-2023 Silverado 4500/5500/6500 models equipped with the 6.6L […]

September 20, 2022
Knock Sensor Performance Condition

Knock Sensor Performance Condition

Some 2022 Camaro, Colorado, Acadia, Canyon, XT5 and XT6 models equipped with the 3.6L V6 engine (RPO LGX, LGZ) may have an illuminated Check Engine MIL along with DTC P0331 […]

September 20, 2022
Power Folding Mirror Speeds

Power Folding Mirror Speeds

The power folding mirrors on the driver’s side and passenger’s side of the vehicle (Fig. 10) may appear to operate at different speeds on some 2019-2023 Silverado 1500, Sierra 1500; […]

September 20, 2022
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 […]

September 20, 2022
2023 Battery Ratings Chart and Battery Maintenance FAQs Update

2023 Battery Ratings Chart and Battery Maintenance FAQs Update

U.S. dealerships use the Battery Maintenance Report to identify vehicles in dealer inventory that require attention. (Fig. 1) The report, which is updated every day, indicates if a battery charge […]

August 30, 2022