TCSC Top Issues This Week
The Techline Customer Support Center (TCSC) is available to help dealerships with diagnostic and programming issues related to Techline Connect (TLC) and the Service Programming System (SPS). TCSC has now […]
GDS2 Core Update Required by March 16
The GDS2 core update 22.8.00900 in Techline Connect that was recently released on March 10 included various bug fixes. The update will download and install automatically upon logging into Techline […]
MDI 2 Order Lead Times Update
The EL-52100 MDI 2 is required for control module programming, configuration and setup on GM vehicles equipped with the Vehicle Intelligence Platform (VIP) electrical architecture. (Fig. 2) Fig. 2 […]
Low Oil Pressure at Idle
Low and erratic oil pressure at idle may be found on some 2024-2025 Acadia, Traverse; and 2025 Enclave models equipped with the 2.5L engine (RPO LKO). DTC P06DD (Engine Oil […]
DTCs Set Due to Wiring Harness Condition
There may be several communication DTCs set along with several Driver Information Center messages —Service Power Steering, Service StabiliTrak, Service Rear Drive, Service Restraint System — displayed on some 2020-2024 […]
Heavy Fuel Use Message
There may be a “Heavy Fuel Use” message on the Driver Information Center (DIC) (Fig. 11) at times while driving on some 2023-2025 Escalade, Silverado 1500, Tahoe, Suburban, 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. This month the seminar covers valve body repair on the 10L80 transmission. (Fig. […]
Vehicle-Wide Programming Update Shows New Programming Status Summaries
The Vehicle-Wide Programming feature in Techline Connect (TLC), which allows multiple control modules to be programmed during the same programming event, was updated recently with enhanced vehicle software status and […]
Windshield Wiper Arms Interference
2024-2025 Equinox EV and 2025 OPTIQ models feature large, overlapping windshield wipers that provide a clear view of the road ahead for drivers. If the wiper arms are not aligned […]
Roof Panel Pop Sound
When driving through an automatic car wash, a loud pop (oil canning) sound may be heard on some 2023-2025 Colorado and Canyon trucks. The pop sound may be the roof […]
Guidelines for Successful Installation of GM Accessories
Before installing a variety of GM Accessories, such as keyless entry, upsize wheels and tires, lights/cargo lamps and others, on GM vehicles, it’s important to check for vehicle compatibility, if […]
Creating a TAC Case on DCT Transmissions
When creating a Technical Assistance Center (TAC) case using the Dealer Case Management (DCM) system on a 2020-2025 Corvette with a Direct Clutch Transmission (DCT) (Fig. 19) performance or leak […]
February 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 February GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
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 […]
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 […]
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, […]
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 […]
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 […]
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 […]
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Previous Articles
Rollout of Required Multi-Factor Authentication for Techline Connect Begins
Turn Signal Canceling and Steering Column Rattle Conditions
FSE Technician Recognition Awards – 4th Quarter 2024
Rattle Sound from the Brake Pedal Area
January Service Newsletter from the Experts at GM TAC
2025 OPTIQ Adds to Growing Cadillac EV Lineup
2025 OPTIQ TAC Action Center
10-Speed Automatic Transmission Diagnostic Tips
Power Moves — 2025 ESCALADE IQ and Escalade Power Side Doors Operation
GM Service Know-How Emerging Issues
Plan for Lunch with Your FSEs in 2025
Diagnosing the Keyless Entry System
December Service Newsletter from the Experts at GM TAC
Loose Exhaust System Fasteners
Service Leveling System Message
Corvette 5.5L V8 Engine Oil Change Service
Checking the Air Conditioning Condenser Line Seal Washers
Shifter Vibration or Rattle Sound
GM Dealer Equipment (GMDE)
TAC Newsletter February 2025
TAC Newsletter January 2025
Techline Connect Tips November 2024
