2025 OPTIQ Adds to Growing Cadillac EV Lineup
The all-new 2025 OPTIQ is the latest entry in Cadillac’s EV lineup. (Fig. 3) It will launch with several segment-leading features that add to its performance, style and functionality. […]
2025 OPTIQ TAC Action Center
The GM Technical Assistance Center (TAC) has established a TAC Action Center for U.S. dealerships to provide product feedback on the all-new 2025 Cadillac OPTIQ. (Fig. 13) Fig. 13 […]
10-Speed Automatic Transmission Diagnostic Tips
Whine sounds, or similar sounds, from the 10-speed automatic transmission on some 2020-2025 CT4, CT5, Escalade, Camaro, Silverado 1500, Tahoe, Suburban, Sierra 1500 and Yukon models equipped with the 10L60/80/90 […]
Power Moves — 2025 ESCALADE IQ and Escalade Power Side Doors Operation
The new all-electric 2025 ESCALADE IQ and new 2025 Escalade and Escalade ESV deliver a truly luxurious passenger experience with inspiring design, craftsmanship and technology. These full-size SUVs offer a […]
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 the operation of the new 2025 ESCALADE IQ […]
Plan for Lunch with Your FSEs in 2025
GM dealership technicians can learn about the latest technical information and repair procedures from their Field Service Engineers (FSEs) in the 2025 Lunch with Your Field Service Engineers meetings that […]
Diagnosing the Keyless Entry System
Some 2019-2025 Silverado, Sierra; 2021-2025 Tahoe, Suburban, Yukon and Escalade models may have a keyless entry condition (Fig. 1) with a Service Keyless Entry message displayed on the Driver Information […]
December 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 December GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
Loose Exhaust System Fasteners
The exhaust system fasteners may be loose or damaged on some 2022 Silverado 4500HD/5500HD/6500HD trucks and 2023 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax diesel engine […]
Service Leveling System Message
The Air Ride Adaptive Suspension may be inoperative on some 2024-2025 Silverado EV RST and Sierra Denali EV models. A Service Leveling System message may be displayed on the Driver […]
Corvette 5.5L V8 Engine Oil Change Service
When changing the engine oil on the 2023-2025 Corvette Z06 equipped with the 5.5L V8 engine (RPO LT6) (Fig. 11), it is critical to follow all steps in the Engine […]
Checking the Air Conditioning Condenser Line Seal Washers
If the air conditioning is not working or blows warm air on a 2024-2025 GM model, it may be due to a leaking condenser seal. The seal washers between the […]
Shifter Vibration or Rattle Sound
There may be a vibration felt in the shift lever assembly or a rattle or tapping sound heard near the instrument panel or center console on some 2020-2023 Encore GX […]
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 […]
Print Edition
Previous Articles
Enrollment Kicks Off for 2025 Mark of Excellence Program
Proactive Alerts — 12V Battery Drain Detection for EVs
New All-Electric 2025 ESCALADE IQ Shows Off Style and Performance
ANC Microphone Rattle
Servicing High-Voltage Batteries Before Replacement
Using Multi-Factor Authentication for Techline Connect
Techline Connect Install/Uninstall Guide Updated
Checking for Software Updates on EVs
Gross Combined Weight Message on the Driver Information Center
Update: Google Maps Application Offline
GM Service Know-How Emerging Issues
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
GM Dealer Equipment (GMDE)
TAC Newsletter December 2024
TAC Newsletter November 2024
Techline Connect Tips November 2024
