Poor A/C Performance Due to Loss of Refrigerant
The fluorescent dye installed in the air conditioning refrigerant system of all current GM vehicles helps in locating leaks in the A/C system. Using the GE-42220 Universal 12V Leak Detection […]
Archive for July, 2025
Loss of A/C and Warm Air Conditions
There may be a loss of air conditioning, weak cooling or warm air coming out of the vents on some 2024-2025 Silverado 1500 and Sierra 1500 trucks. These conditions may […]
July 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 July GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
Power Hood Closure Conditions
The power hood (RPO AHV) (Fig. 1) on some 2022-2025 HUMMER; 2024-2026 Silverado EV, Sierra EV; and 2025-2026 ESCALADE IQ models may not close or cinch shut properly. There may […]
Diesel Engine Oil Cooler Seal Leak
Some 2024-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax diesel engine (RPO L5P) may have an engine oil leak. In many cases, the oil leak may […]
Check Grounds for No Start Condition
There may be a no start condition on some 2025-2026 Equinox and Terrain models. In addition, the starter may click and there may be several DTCs set in the Engine […]
Battery Cable Clamp Alignment Results in Low Voltage
Some 2023-2025 Colorado and Canyon models may have a no start condition, a possible dead battery and multiple messages displayed on the Driver Information Center. There also may be several […]
Upper Body Auxiliary Lamp Connection
The left or right rear upper body auxiliary lamp (Fig. 11) may not illuminate on some 2025-2026 ESCALADE IQ and ESCALADE IQL models. The upper body auxiliary lamp connector may […]
Anti-Chip Coating Appearance on Full-Size Trucks
All 2018-2026 Silverado 1500, Sierra 1500; and 2019-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks have stone guard protection applied to the lower painted surfaces that provides added defense against stone […]
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 installing the accessory puddle lamps on the ESCALADE […]
OneCRM and Dealer Case Management System Migration
GM dealer support teams, including TAC, TCSC, DBC and others, will be going through training for the new flagship case management system OneCRM on July 7–18. We apologize for any […]
Print Edition
Previous Articles
CX Connect Case Creation Tips
New Diagnostic Strategy: Reprogram Control Modules Before Replacement
Corvette Center Console Latch Pushbutton Replacement
New Dash Cover Addresses Windshield Glare
The Info on Dealer Information — Choosing the Right Contact for Service Department Concerns
GM Service Know-How Emerging Issues
Learn More About CX Connect – New System Going Live Soon
Techline Connect & GDS2 Split Update Released- Poor A/C Performance Due to Loss of Refrigerant
- Loss of A/C and Warm Air Conditions
- July Service Newsletter from the Experts at GM TAC
- Power Hood Closure Conditions
- Diesel Engine Oil Cooler Seal Leak
- Check Grounds for No Start Condition
- Battery Cable Clamp Alignment Results in Low Voltage
- Upper Body Auxiliary Lamp Connection
- Anti-Chip Coating Appearance on Full-Size Trucks
- GM Service Know-How Emerging Issues
- OneCRM and Dealer Case Management System Migration
DCA-8000
Troubleshooting
Guide
TAC Newsletter September 2025
TAC Newsletter August 2025
Techline Connect Tips November 2024
CX Connect Case Creation Help + Tips and Tricks
