Wiper Blade Performance Diagnosis
Streaking is the most common warranty condition found with wiper blades on GM models. However, worn blades are not the only cause of streaking. Several other issues that can affect […]
8-Speed Transmission Noise Concerns
There may be a noise concern on some 2015-2019 Corvette; 2015-2020 Escalade, Yukon; 2015-2024 Silverado 1500, Sierra 1500; 2016-2018 CT6; 2016-2019 ATS, CTS; 2016-2023 Camaro; 2017-2023 Colorado, Canyon; 2017-2024 Express, […]
Inoperative IntelliBeam Auto High-Beam Headlamps
The functionality of the IntelliBeam automatic high-beam headlamps may be inoperative on some 2024-2025 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks. (Fig. 17) The side blind zone and side object detection […]
Wheel Drive Shaft Retention Snap Ring Design Change
There has been a design change to the wheel drive shaft retention snap ring on 2024-2025 Silverado EV, Sierra EV, HUMMER EV Pickup, HUMMER EV SUV; and 2025 BrightDrop 600. […]
August 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 August GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
New Vehicle-Wide Programming for Software Updates
With its enhanced capacity and ability to manage technology complexity, the GM Vehicle Intelligence Platform (VIP) electrical architecture offers the capability of managing over 100 electronic control modules. When necessary, […]
Front Bumper Bracket May Affect Active Grille Shutter Operation
Some 2024 Acadia, Traverse; and 2025 Enclave models may have an active grille shutter malfunction along with DTC P059F (Active Grille Air Shutter 1 Performance) set in the Engine Control […]
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. This month the seminar highlights adjustments to the HUMMER EV Sky Panel. (Fig. […]
Unwanted Reverse Automatic Braking
Backing out of the garage may bring some vehicles equipped with Reverse Automatic Braking to a quick stop. The design sensitivity of the rear virtual bumper on 2023-2024 LYRIQ; 2024 […]
Adjusting the Hood Bumpers and Latch to Remove Low Spots on Hood
Some 2024 Traverse models may show low spots or dimples on the front and center portions of the hood. The low spots will only be noticeable when the hood is […]
Low-Beam Headlamp Diagnosis
The low-beam headlamp may be inoperative on some 2019-2024 Silverado 4500HD/5500HD/6500HD models. (Fig. 6) Fig. 6 If the low-beam headlamp is not working properly, check the electrical connector […]
Correct Tire Size Affects Driver Assistance Systems
The Adaptive Cruise Control or regular Cruise Control as well as the Lane Keep Assist system may turn on/off while driving or may be inoperative on some 2019-2023 Encore GX […]
Loss of Communication with ECM
Some 2019-2022 Silverado 1500, Sierra 1500; and 2020-2022 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD models may have an illuminated Check Engine MIL at startup along with DTC U0100 (Lost Communication with […]
July 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 July GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
Resolving Service Programming System Errors
There are several Service Programming System (SPS) errors that can be resolved by following some basic steps, and do not require replacing the control module, on 2000-2025 GM models. No […]
Corvette Transmission External Canister Filter and Maintenance Update, Labor Code Added
The Tremec DCT TR9080 dual clutch transmission (RPO M1L, M1M) on 2020-2024 Corvettes features an external canister filter that should be replaced at the initial 7,500-mile (12,000-km) maintenance service. After […]
FSE Technician Recognition Awards – 2nd Quarter 2024
The GM Field Service Engineer (FSE) Technician Recognition Awards (U.S.) celebrate the skill and dedication of dealership technicians who have recently worked with FSEs on challenging repairs. Technicians at GM […]
Noise from the Transmission Area
There may be a noise from the bell housing area of the DCT TR9080 transmission (RPO M1L, M1M) on some 2020-2024 Corvettes along with a number of DTCs set in […]
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. This month the seminar covers a tear down and inspection of the VT40 […]
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Previous Articles
GM Virtual Tool Crib App Tracks Dealerships’ Special Tools Inventory
Insufficient Dual Tank Fuel Transfer
Properly Testing Bladed Thermal Fuses
June Service Newsletter from the Experts at GM TAC
Preventing Rear Glass Damage During Folding Top Service
Side Detection System Unavailable
Transmission Not Shifting, Defaults to 5th Gear
Turning Off Transport Mode in the Vehicle Settings Menu
Signing In to Techline Connect
New Techline Connect Install/Uninstall Guide Addresses Application Errors
Loss of Forward Gear on CVT Transmission
Transmission Out-of-Round Snap Rings
GM Service Know-How Emerging Issues
Ceramic Glow Plug Replacement
Techline Update Manager
Front Stabilizer Bar Links Installation Update
May Service Newsletter from the Experts at GM TAC
Inoperative Components After Front View Camera Replacement
GM Dealer Equipment (GMDE)
TAC Newsletter August 2024
TAC Newsletter July 2024
Techline Connect Tips June 2024
