Proactive Alerts, a feature of OnStar Advanced Diagnostics, are designed to help predict specific types of potential performance degradation based on current vehicle data. New Proactive Alerts have been added […]
Proper Use and Diagnostic Tips for NFC Key Cards
Key cards are wallet-sized cards that can be used to unlock, lock and start a number of GM vehicles when the key fob is not available. Key cards (part of […]
Camshaft Position Sensor Performance Diagnosis
When diagnosing engine performance issues, DTCs P0340 (Intake/Single Camshaft Position Sensor Circuit), P0341 (Intake/Single Camshaft Position Sensor Performance), P0011 (Intake/Single Camshaft Position System Performance) or P0016 (Crankshaft Position Sensor and […]
Tick Sound at Idle on V8 Engines
The 5.3L, 6.2L and 6.6L V8 engines (RPO L84, L87, L8T) available in 2019-2026 Silverado 1500, Silverado 2500HD/3500HD, Tahoe, Suburban, Sierra 1500, Sierra 2500HD/3500HD, Yukon and Escalade models may have […]
March 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 March GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
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 […]
CCND Labor Codes Updated for Infotainment Audio and Screen Conditions
An update to Bulletin #22-NA-038 has been released that covers changes for several Customer Concern Not Duplicated (CCND) labor operations that address screen conditions and audio system issues on 2022-2027 […]
FSE Technician Recognition Awards – 1st Quarter 2026
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 […]
Radiator Inlet Hose Coolant Leak
Some 2023-2026 Colorado and Canyon models may have a visible coolant leak from the upper radiator inlet hose connection or a low coolant level at the overflow reservoir. DTC P3075 […]
Sending GDS 2 Session Logs to TAC Using CX Connect
There are times when working on a case with the GM Technical Assistance Center (TAC) where a GDS 2 session log will be needed to help with diagnosis of an […]
Key Fob Synchronization Update
All buttons on one key fob (Remote Keyless Entry transmitter) may be inoperative on some 2023-2026 Escalade, LYRIQ, Corvette, Tahoe, Suburban, Yukon; 2024-2025 XT4; 2024-2026 BrightDrop, Envision, CT5, Colorado, Silverado […]
CT5-V Blackwing Precision Package Features High-Performance Cup Tires with Unique Appearance
The available Precision Package (RPO V8V) on 2025-2026 CT5-V Blackwing models is a track-focused chassis package that is designed to enhance the dynamic performance of the vehicle on the road […]
Lunch with Your FSEs Monthly Meeting
The monthly Lunch with Your Field Service Engineer meeting will take place March 18. The one-hour meeting will be held online via Microsoft Teams and offers GM dealership technicians, shop […]
New TAC Phone Prompts Help Speed Support to Dealerships
Starting March 18, 2026, GM TAC is launching a new phone prompt experience to help route calls from technicians seeking assistance more quickly. Fig. 2 Enter TAC Case […]
Print Edition
Previous Articles
- TCSC Top Issues This Week
Lunch with Your FSEs Monthly Meeting
New TAC Phone Prompts Help Speed Support to Dealerships
Intermittent Front Lighting Operation
Loss of Reverse/Forward Grid Lines in Camera View
Inoperative Heated and Ventilated Front Seats
Brake Pad Wear Sensor Contact with Rear Half Shaft
February Service Newsletter from the Experts at GM TAC
The 2027 Chevrolet Bolt Makes Its Comeback
2027 Chevrolet Bolt TAC Action Center
NACS and CCS1 Charging Adapter Options
February CX Connect Release Provides Multiple App Updates
GM Service Know-How Emerging Issues
DCA-8000
Troubleshooting
Guide
TAC Newsletter March 2026
TAC Newsletter February 2026
Techline Connect Tips November 2024
CX Connect Case Creation Help + Tips and Tricks
