Tips on Identifying Diesel Fuel Contamination
Poor engine performance may be due to fuel contamination on some 2014-2019 Cruze models equipped with the 2.0L diesel engine (RPO LUZ); 2018-2019 Equinox and Terrain models equipped with the […]
Midtronics Diagnostic Charger DCA-8000P Announced as Essential Tool
The Midtronics Diagnostic Charger DCA-8000P (Fig. 6) is now an Essential Tool for all U.S. dealerships. The DCA-8000P is a state-of-the-art battery charger and tester that provides accurate testing, fast […]
Accessing Air Ride Adaptive Suspension Data
The Air Ride Adaptive Suspension (RPO F47), available on 2021-2024 Escalade, Tahoe, Suburban, Yukon; 2022-2025 HUMMER EVs; 2024-2025 Silverado EV and Sierra EV, adjusts the ride height of the vehicle […]
Aftermarket Exhaust System Conditions
Owners of 2020-2025 Corvettes may install an aftermarket exhaust system on their vehicle in an effort to change the performance characteristics or look of the system. However, a number of […]
Lower Case Extension and Oil Pan Comparison
When replacing the Lower Case Extension (LCE) (Fig. 12) on 2019-2025 Silverado 1500, Sierra 1500; 2020-2025 CT4; 2023-2024 Colorado and Canyon models equipped with the 2.7L engine (RPO L2R, L3B), […]
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 reviews diagnosing parasitic drains using the PicoScope. (Fig. 15) […]
New Features of the 2025 Escalade and ESCALADE IQ
The new 2025 Escalade and first-ever all-electric 2025 ESCALADE IQ boast iconic design, interior craftsmanship and the latest automotive technology. Each of these luxury full-size SUVs offer a number of […]
Follow All Guidelines to Determine Hybrid/EV Battery Stability, Return Shipping Requirements
Before returning the high-voltage battery (Fig. 6) of the 2023-2025 LYRIQ; 2024-2025 Blazer EV, Equinox EV, Silverado EV, Sierra EV; 2022-2025 HUMMER EVs; and 2022-2025 BrightDrop models, there are a […]
New 2024 Dealer Infrastructure & Security Guidelines Update Firewall Exclusions and SPS USB Requirements
With rapidly changing technology being utilized throughout the dealership environment, the GM Dealer Infrastructure & Security Guidelines (DISG) have been updated to help dealers maintain reliable data communications, establish security […]
Vehicle Speed Limitations
There are several reasons why a speed limitation may be in place on 2020-2025 Corvette models (Fig. 14), such as an active Teen Driver mode or the convertible folding top […]
November 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 November GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
Get Recognized for Your Training Achievements in the 2025 Technician Excellence Program
The 2025 Technician Excellence Program (U.S.) recognizes and rewards enrolled dealership technicians for achieving technical training certifications and meeting other service criteria. Program criteria include training achievements in the Center […]
Enrollment Kicks Off for 2025 Mark of Excellence Program
The Mark of Excellence program (U.S.) recognizes the achievements, professionalism and commitment of GM service technicians as well as other dealership personnel. For the 2025 program, enrolled technicians who meet […]
Proactive Alerts — 12V Battery Drain Detection for EVs
Proactive Alerts, a feature of OnStar Advanced Diagnostics, are designed to help predict specific types of potential performance degradation based on current vehicle data. Several new Proactive Alerts have been […]
New All-Electric 2025 ESCALADE IQ Shows Off Style and Performance
The 2025 ESCALADE IQ, the first-ever all-electric full-size SUV from Cadillac, redefines the luxury SUV experience with an Ultium Platform delivering a Cadillac-estimated 460 miles of range, vehicle-to-home bidirectional charging […]
ANC Microphone Rattle
There may be a vibration or rattle sound in the body of the vehicle on some 2025 Equinox models. The vibration or rattle may be more noticeable under light load, […]
Servicing High-Voltage Batteries Before Replacement
The high-voltage (HV) battery in 2022-2025 HUMMER EV; 2023-2025 BrightDrop, LYRIQ; 2024-2025 Blazer EV, Equinox EV, Silverado EV and Sierra EV models requires updated Battery Energy Control Module (BECM) calibrations […]
Using Multi-Factor Authentication for Techline Connect
Multi-Factor Authentication (MFA) — an identity verification process that requires at least two methods of authentication, such as a password and a temporary passcode, to verify a user’s identity — […]
Techline Connect Install/Uninstall Guide Updated
If an error occurs when launching the Techline Connect (TLC) application, the first solution is often to try to restart TLC. If the application still does not start correctly, it […]
Checking for Software Updates on EVs
Electric Vehicles (EVs) feature a number of electronic control modules that may require software updates. These updates are important to not only resolve operating issues, but also to enhance vehicle […]
Gross Combined Weight Message on the Driver Information Center
There may be a GCW Overweight message displayed on the Driver Information Center of some 2022-2025 Silverado 1500, Sierra 1500; and 2024-2025 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with […]
Update: Google Maps Application Offline
Due to a recent update of the Google Maps application, an issue may arise in which the infotainment system (RPO IOK, IVD, IVE) has a persistent “Offline” icon in maps […]
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 takes a first look at the all-new 2025 Escalade […]
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Previous Articles
Oil Pump Assembly Oil Pressure Relief Valve Condition
Unable to Fill the DEF Tank
October Service Newsletter from the Experts at GM TAC
New TAC Action Center for 2025 Tahoe, Suburban, Yukon and Yukon XL
Techline Connect Moving to Microsoft Azure Platform — New Login Features
Techline Connect Browser Launch Update
Using the NACS DC Adapter to Access the Tesla Supercharger Network
Power Hood (eTrunk) Offers Several Open/Close Methods
Addressing Brake Noise Requires Regular Maintenance
2025 Battery Ratings Chart and Battery Maintenance Update
Long TCSC Hold Times – Counterfeit MDI Devices
Engine Coolant Leak from Water Pump
FSE Technician Recognition Awards – 3rd Quarter 2024
GM Service Know-How Emerging Issues
GM Dealer Equipment (GMDE)
TAC Newsletter November 2024
TAC Newsletter October 2024
Techline Connect Tips November 2024
