TechLink

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 […]

June 3, 2026 —

Update – Midtronics DCA-8000 Diagnostic Charger is the Only Accepted Battery Tester for Warranty Battery Replacement (U.S.)

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 […]

May 31, 2026 —

Rear Leaf Spring Noise and Possible Fuel Contamination

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 […]

May 31, 2026 —

2027 Bolt State of Charge and NACS Charging Tips

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 […]

May 31, 2026 —

Fuse F17UA and Possible No Start Condition

A no start condition on some 2024-2026 Acadia, Traverse; and 2025-2026 Enclave models may be caused by a rear wiper motor binding or a bent wiper arm. (Fig. 16) Fuse […]

May 31, 2026 —

Inoperative PTO on Silverado Medium-Duty Trucks

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 […]

May 31, 2026 —

Create Custom Data Lists in GDS 2

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 […]

May 21, 2026 —

Updated Transfer Case Input Shaft Seal Installation

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 […]

May 21, 2026 —

A/C Leak Detection Dye for EVs

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, […]

May 21, 2026 —

When and Why to Use Fuel Additives

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 […]

May 21, 2026 —

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 (10226.05V – U.S.) offers tips on completing the Multi-Point […]

May 21, 2026 —

Lunch with Your FSEs May Meeting

The monthly Lunch with Your Field Service Engineers meeting will take place May 20. The one-hour meeting will be held online via Microsoft Teams and offers GM dealership technicians, shop […]

May 18, 2026 —

Check 55-Way Connector if Glow Plug DTCs are Set

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 […]

April 27, 2026 —

Setting Up Wired and Wireless MDI 2 Connections

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 […]

April 27, 2026 —