Inoperative USB Port Diagnosis
Many 2020-2023 GM models feature USB ports for mobile device charging and data connection. If a smartphone or other device does not charge or transfer data properly when connected to […]
Avoid the TUN# Label When Cleaning Transmission Cases
Recently, a number of 8-speed and 10-speed transmissions have been returned to the Warranty Parts Center with missing or unreadable Transmission Unique Label (TUN) labels. In some cases, the label […]
High-Pitched Whistling Sound at Idle
A high-pitched whistling or squeal sound may be heard at idle on some 2022-2023 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD models equipped with the 6.6L V8 gasoline engine (RPO L8T). The […]
Using the COAX FAKRA Cable Adapter Kit
The EL-52552 COAX FAKRA Cable Adapter Kit can help in diagnosing a variety of coax cables, including Wi-Fi, cameras, headliner cables, A-pillar cables and more. Diagnosing coax cables routed through […]
Individual Parts of Valve Lifter Oil Manifold Kit Now Available
When addressing an engine misfire condition on some 2014 Silverado 1500, Sierra 1500; 2014-2019 Corvette; 2015-2018 Silverado, Sierra; 2015-2020 Tahoe, Suburban, Yukon, Escalade; 2016-2019 CTS-V; 2016-2023 Camaro; and 2019 Silverado […]
New Engine Calibration Addresses Fuel Injection Variation
Some 2022-2023 Trailblazer and Encore GX models equipped with the 1.3L engine (RPO L3T) may have an illuminated Check Engine MIL and DTC P2B95 (Injection Pulse Performance During Cold Start) […]
April 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 April GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
New Timing for SAVI Dongle Data Warranty Claim Requirements
The Service Advisor Vehicle Interface (SAVI) service lane scan tool streamlines the vehicle walkaround process for service advisors in GM dealerships (U.S.) and accurately provides a variety of critical vehicle […]
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. 8) Which is best for you depends on typical use of […]
MDI 2 Advanced Setup Technical Guidelines
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 […]
FSE Technician Recognition Awards – 1st Quarter 2023
The GM Field Service Engineer (FSE) Technician Recognition Awards (U.S.) celebrate the skill and dedication of dealership technicians who have recently worked with FSE’s on challenging repairs. Technicians at GM […]
Updated Techline Connect Tips
The Techline Customer Support Center (TCSC) has released their latest tips for Techline Connect and the Service Programming System. The tips — included in the easy-to-print PDF below — cover […]
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 looks at Hybrid/Electric Vehicle battery pack uncrating and crating […]
When to Operate Four-Wheel Drive
Driving through mud, snow or rain on dirt, sand or dry pavement? Depending on the particular road conditions, what’s the best drivetrain choice – two-wheel drive, four-wheel drive, all-wheel drive? […]
Servicing Diesel Engines with Ceramic Glow Plugs
When replacing ceramic glow plugs 2017-2019 Cruze; 2018-2019 Equinox, Terrain; 2020-2023 Silverado 1500, Silverado 2500HD/3500HD, Silverado 4500HD/5500HD/6500HD, Tahoe, Suburban, Sierra 1500, Sierra 2500HD/3500HD and Yukon models equipped with the 1.6L […]
Tips for Outside Rearview Mirror Glass Service
Many 2022-2023 HUMMER EVs offer the GM Accessory Outside Rearview Mirror Projection Lights, which is an accessory illumination package that features an outside mirror with a HUMMER EV projection logo […]
Open Fuses Set Glow Plug DTCs
The Check Engine MIL and several glow plug-related DTCs may be set on some 2024 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD models equipped with the 6.6L Duramax diesel engine (RPO L5P). […]
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 […]
To the Max – Achieving Success in the 2023 Technician Excellence Program
GM dealership service technicians enrolled in the 2023 Technician Excellence Program (U.S.) are recognized and rewarded quarterly for achieving Gold Certification, Master Technician Certification (MTC), or World Class Technician (WCT) […]
MDI 2 Manager Software Update
A new software update for the MDI 2 Manager is continuing to roll out to GM dealerships (U.S.) The staggered rollout of the new MDI 2 Manager software (version 9.1.1766.85) […]
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Previous Articles
Transmission Whine Sound
March Service Newsletter from the Experts at GM TAC
Vehicle Alignment and Super Cruise
Rear Axle Differential Lock Control Actuator Condition
Diesel Exhaust Fluid Supply Pipe Contamination
FSE Technician Recognition Awards – 1st Quarter 2024
Crankshaft Bearing Diagnosis
Convertible Top Water Leak
Power Tonneau Cover Tips
GM Service Know-How Emerging Issues
MDI 2 Advanced Setup Technical Tips Update
Fuel Feed Pipe Buzzing Sound
February Service Newsletter from the Experts at GM TAC
Exhaust Resonator Rattle
Heated Steering Wheel Operation During a Remote Start
GM Dealer Equipment (GMDE)
TAC Newsletter March 2024
TAC Newsletter February 2024
Techline Connect Tips March 2023
