Transmission Shudder and Noise

Transmission Shudder and Noise

A vehicle shudder and a growl or humming sound may be present when driving between 28-53 mph (45-85 km/h) on some 2024 Envista and Trax models equipped with the 6T40 […]

February 10, 2025
Improper Coolant Flow and Poor Heater Performance

Improper Coolant Flow and Poor Heater Performance

Some 2023-2025 Colorado, Silverado 1500, Canyon and Sierra 1500 trucks equipped with the 2.7L engine (RPO L3B, L2R) may have poor heater performance due to blocked coolant flow. The coolant […]

February 10, 2025
Transmission Fluid Leak Near Torque Converter Housing

Transmission Fluid Leak Near Torque Converter Housing

Some 2024-2025 Encore GX, Enclave, XT4, XT5, XT6, Blazer, Trailblazer, Traverse, Acadia, Terrain; and 2025 Equinox models equipped with the 9T45/50/60/65 9-speed automatic transmission (RPO M3F, M3U, M3H, M3T, M3G, […]

February 10, 2025
2025 Model Year Engine Oil Capacities Chart

2025 Model Year Engine Oil Capacities Chart

The latest TechLink 2025 Engine Oil Capacities chart is now available under the Reference Charts menu. The chart includes engine, RPO, specifications (liters and quarts), oil viscosity and engine oil […]

February 10, 2025
MDI 2 Point-to-Point Wireless Functionality Concern After Operating System Update

MDI 2 Point-to-Point Wireless Functionality Concern After Operating System Update

There may be an issue with the MDI 2 point-to-point wireless functionality after updating the operating system of PCs in the service department running Windows 11. After performing the latest […]

February 10, 2025
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. This month the seminar reviews the latest updates to training paths in the […]

February 10, 2025
Rollout of Required Multi-Factor Authentication for Techline Connect Begins

Rollout of Required Multi-Factor Authentication for Techline Connect Begins

The rollout of Multi-Factor Authentication (MFA) for logging in to Techline Connect is now underway for GM dealerships. In the coming weeks, Global Connect Headline communications will be released with […]

January 27, 2025
Turn Signal Canceling and Steering Column Rattle Conditions

Turn Signal Canceling and Steering Column Rattle Conditions

Some 2023-2024 Colorado, Canyon; and 2024 Blazer EV models may have a turn signal condition and, on 2023-2024 Colorado, Canyon models, a rattle sound may be heard coming from the […]

January 27, 2025
FSE Technician Recognition Awards – 4th Quarter 2024

FSE Technician Recognition Awards – 4th 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 […]

January 27, 2025
Rattle Sound from the Brake Pedal Area

Rattle Sound from the Brake Pedal Area

There may be a rattle sound heard from the brake pedal area on some 2025 HUMMER EV models. The sound may be caused by excess body seam sealer extending under […]

January 27, 2025
January Service Newsletter from the Experts at GM TAC

January 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 January GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]

January 27, 2025
2025 OPTIQ Adds to Growing Cadillac EV Lineup

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.   […]

January 15, 2025
2025 OPTIQ TAC Action Center

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 […]

January 15, 2025
10-Speed Automatic Transmission Diagnostic Tips

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 […]

January 15, 2025
Power Moves — 2025 ESCALADE IQ and Escalade Power Side Doors Operation

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 […]

January 15, 2025
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. This month the seminar covers the operation of the new 2025 ESCALADE IQ […]

January 15, 2025
Plan for Lunch with Your FSEs in 2025

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 […]

January 15, 2025
Diagnosing the Keyless Entry System

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 23, 2024
December Service Newsletter from the Experts at GM TAC

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 […]

December 23, 2024
Loose Exhaust System Fasteners

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 […]

December 23, 2024
Service Leveling System Message

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 […]

December 23, 2024
Corvette 5.5L V8 Engine Oil Change Service

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 […]

December 23, 2024
Checking the Air Conditioning Condenser Line Seal Washers

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 […]

December 23, 2024
Shifter Vibration or Rattle Sound

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 […]

December 23, 2024