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 […]
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) […]
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 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 […]
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 […]
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 […]
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 […]
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; […]
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 […]
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 […]
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Previous Articles
Search TAC Cases Using the Dealer Case Management System
Infotainment Setup Tips for Using Google built-in
August Service Newsletter from the Experts at GM TAC
GM Service Know-How Emerging Issues
Diagnostic Tips for Exhaust Charge DTCs
EVAP System Leak Testing
Rear Axle Moan During Turns
Exhaust Heat Shield Rattle
Residue on Liftgate Strut is not a Fluid Leak
Cooling Fan Speed Too Low Condition
Cradle Brace Mounting Rattle
Diesel Exhaust Fluid Contamination in the Fuel System
New Components Available for Pre-Repair Authorization Using the CSMT App
Two Seal Designs Included in 10-Speed Transmission Auxiliary Pump Seal Kit
Front Heated Seat Malfunction After Collision Repairs
Service Transmission Messages Require Engine Control Module Reprogramming
Service Programming Direct Launch Handling
GM Dealer Equipment (GMDE)
GM EV Safety Gloves
TAC Newsletter September 2022
Techline Connect Setup
for Updates
