The Midtronics DCA-8000 Diagnostic Charger (Fig. 1) is the latest generation battery charger and tester from Midtronics. It provides fast, accurate testing results and is the GM-required tool for charging […]
Some 2020-2026 Silverado 1500 and Sierra 1500 trucks equipped with the 3.0L diesel engine (RPO LM2, LZ0) may have a squeak or clunk sound coming from the rear of the […]
The new 2027 Bolt features a 65-kWh lithium iron phosphate (LFP) high-voltage battery pack, enabling faster charging. It uses a native North American Charging Standard (NACS) charging port that provides […]
A no start condition on some 2025-2026 Acadia, Traverse and Enclave models may be caused by a rear wiper motor binding or a bent wiper arm. (Fig. 16) Fuse F17UA […]
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 […]
BCM Series: Content Theft Deterrent System
Return All Transmission-Related Parts to the WPC
New Body Control Module Series: Unlocking Keyless Entry Functions
GM Service Know-How Emerging Issues
Record Serial Numbers for Removed and Installed Components Under Certain Labor Operations
Control Module Reprogramming Selection Now Required in SPS
Becoming a World Class Technician – New Certification Requirements Coming in 2028
Ethernet Cable Overlay for Telematic Control Module Interference
August Service Newsletter from the Experts at GM TAC
Inoperative Engine Cooling Fan
Transmission Stuck in 1st Gear
Gear Shift Control Module Contamination
New GM Parts Connect Delivers Smarter, Faster Parts Lookup
GM Service Know-How Emerging IssuesTAC Newsletter September 2026
TAC Newsletter August 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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