Some 2019-2023 Silverado 4500HD/5500HD/6500HD trucks may have an intermittent condition where the available Power Take-Off (PTO) is inoperative along with DTC P251A (PTO Enable Switch Circuit) set in the PTO […]
The latest update to GDS 2 in Techline Connect provides technicians with the ability to build personalized data parameter lists tailored for specific diagnostic sessions — identifying only the data […]
Seal installation depth is critical when replacing the transfer case front input shaft seal between the transmission and transfer case on 2020-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with […]
GM has recently established a new air conditioning refrigerant leak diagnostic procedure for GM EVs and PHEVs — including the Silverado EV, Blazer EV, Equinox EV, Bolt EV/EUV, Corvette E-Ray, […]
Fuel additives are not routine maintenance items. The latest GM guidelines recommend using approved products only to address a verified vehicle condition or fuel-quality concern on GM passenger cars and […]
The monthly GM Service Know-How Emerging Issues seminars provide service/technical information on current issues and GM-certified repairs. This month the seminar (10226.05V – U.S.) offers tips on completing the Multi-Point […]
There may be several glow plug DTCs set on some 2024-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax diesel engine (RPO L5P). DTCs may include: P066A […]
There are several possible methods – both wired and wireless – to connect with the MDI 2 (EL-52100). (Fig. 4) Which is best for you depends on typical use of […]
With the MDI Manager application software, the MDI 2 can be configured to communicate with a PC using several possible networks, such as a USB cable, ethernet cable, Wireless Local […]
The latest diagnostic assistance from the professionals at the GM Technical Assistance Center is now available in the April GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
The latest Techline Connect update and GM Dealer Infrastructure & Security Guidelines (DISG) release include new firewall exceptions for Techline Connect applications. For the recent Techline Connect application update, your […]
All engines require oil to lubricate and protect internal moving components from wear. When a piston moves down its cylinder, a thin film of oil is left on the cylinder […]
The 2nd-row seats (RPO AT6, ATV) available on 2021-2026 Tahoe, Suburban, Yukon, Escalade and 2025-2026 ESCALADE IQ models include a number of adjustment features, such as fore/aft, recline, folding and […]
The new 1.2L engine (RPO LBP), introduced in the 2025 Envista, Encore GX, Trax and Trailblazer, features E85 compatibility. As part of the updates to the Evaporative Emission (EVAP) system, […]
New Belt Drive Rack and Pinion Steering Power Pack Replacement
Unable to Learn Tire Pressure Monitor Sensors
1.3L Engine Coolant Control Valve Failure
Fuel Injection Pump Installation and Diesel Engine Timing
High Resistance on Grounds G103A, G103B
My Open Cases List View Issue in CX Connect
Making Associated Accessory Warranty Claims
TAC and TCSC Phone Support to Require CX Connect Case Number
Vehicle-Wide Programming Update for EVs
Fuel Pump Power Control Module Internal Short
GM Service Know-How Emerging Issues
Guided Diagnostics – The Next Step in a More Focused Repair Path
Service Door Latch Message and Child Safety Lock Condition
Aftermarket Lighting, Sensor Obstruction May Cause False Front Park Assist Alerts
Oil Pan Wiring Harness Diagnostic TipsTAC Newsletter August 2026
TAC Newsletter April 2026
DCA-8000
Troubleshooting
Guide
MDI-2 Connections and Advanced Setup 2026
CX Connect Case Creation Help + Tips and Tricks
GM has recently established a new air conditioning refrigerant leak diagnostic procedure for GM EVs and PHEVs — including the Silverado EV, Blazer EV, Equinox EV, Bolt EV/EUV, Corvette E-Ray, […]
The latest update to GDS 2 in Techline Connect provides technicians with the ability to build personalized data parameter lists tailored for specific diagnostic sessions — identifying only the data […]
Take a detailed look at a wide range of innovative features and advanced systems found on GM vehicles to gain a better understanding of proper operation. Each short video reviews how a feature works, highlights operating tips and shows ways to customize settings, if applicable.
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