Intermittent Click Sound at the Front of the Vehicle
Some 2017-2019 Bolt EVs may have an intermittent click sound at the front of the vehicle and the ABS, traction control and/or StabiliTrack warning lamps may illuminate on the instrument […]
Achieving Maximum Results in the Technician Excellence Program
In the first quarter of the Technician Excellence Program (U.S.), more than 9,000 enrolled technicians earned rewards. The first quarter payouts are scheduled for the week of July 18th. […]
Hood Ajar Message from Coolant Contamination
There may be a Hood Ajar message displayed on the Driver Information Center on some 2014-2020 Impala models with the hood completely closed. The Check Engine MIL may be illuminated […]
Rearview Camera Display Affected by Coaxial Cable Conditions
The Rearview Camera may show a black or blue screen and a triangle icon (Fig. 7) when the vehicle is in Reverse on some 2019 LaCrosse; 2019-2020 CT6; 2019-2022 XT4, […]
DPF Regeneration Odors
The Diesel Particulate Filter (DPF) on the 3.0L Duramax diesel engine (RPO LM2) and 6.6L Duramax diesel engine (RPO L5P) available on 2019-2022 Silverado 1500, Sierra 1500; 2020-2022 Silverado 2500/3500, […]
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. The latest service topics from GM Brand Quality and Engineering covered in […]
Installing HUMMER EV Accessories
The 2022 GMC HUMMER EV Pickup Edition 1 features a number of standard accessories, including assist steps, recovery hooks and a soft roll-up tonneau cover. (Fig. 1) There also are […]
MDI Manager Software Update Splits MDI 1 and MDI 2 into Separate Applications
The Multiple Diagnostic Interface 1 & 2 (MDI/MDI 2) are designed to connect a vehicle to a host PC computer application for data transfer and Electronic Control Unit (ECU) reprogramming. […]
DEF Tank Heater and Wiring Harness Updates
Several updates are now available to address Diesel Exhaust Fluid (DEF) tank, or Emission Reduction Fluid tank (Fig. 18), conditions on some full-size trucks and SUVs equipped with the 6.6L […]
Using R-99 or R-95 Diesel Fuel
GM Engineering has recently approved the use of renewable diesel, R-99 or R-95, for all 2006-2022 GM vehicles equipped with a diesel engine. (Fig. 25) Fig. 25 Renewable […]
TCM DTCs Set on Vehicle Start Up
Some 2020-2022 Corvette models may have a Service Transmission message on the Driver Information Center (DIC), an illuminated Check Engine MIL and a squealing sound immediately after starting the engine. […]
June 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 June GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
Optimizing Fuel Economy with Top Tier Gasoline
Some of the best ways to help enhance fuel economy are through proper maintenance and good driving habits. For example, replacing the engine air filter at the recommended maintenance intervals, […]
FSE Technician Recognition Awards – 2nd Quarter 2022
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 […]
Improper Headlamp or Turn Signal Operation Due to GM Accessory Illuminated Emblem
Some 2020-2022 Sierra 1500, Sierra 2500/3500; and 2021-2022 Yukon models may have a driver-side headlamp or turn signal that stays on, flickers or is inoperative. The dealer-installed GM Accessory Illuminated […]
Transmission Neutral Service Mode on 10-Speed Automatic Transmissions
The 10L80 10-speed automatic transmission (RPO MHS, MQC) available on the new 2022 Silverado 1500 and Sierra 1500 features the Electronic Transmission Range Select (ETRS) system, which electronically shifts the […]
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. The latest service topics from GM Brand Quality and Engineering covered in […]
Get SAVI – New GM Service Advisor Vehicle Interface System Rollout Begins
The national rollout (U.S.) of the Service Advisor Vehicle Interface (SAVI) – GM’s new service lane productivity and vehicle data documentation system – kicked off in April. Service Workbench Pro […]
DCBS Becomes Essential Equipment as Midtronics GR8 to be Discontinued in 2024
In order to accurately diagnose a battery’s state of health from a vehicle in for service or that is part of the dealership’s inventory, the EL-52800 Diagnostic Charge Battery Station […]
Contaminated Charge Air Bypass Valve
Some 2011-2016 Cruze; 2012-2020 Sonic; 2013-2022 Encore and Trax models equipped with the 1.4L engine (RPO LUV) may experience several performance conditions, including loss of power, and an illuminated Check […]
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Previous Articles
Corvette E-Ray Delivers Electrified AWD Performance
Corvette E-Ray 12-Volt Lithium-Ion Battery
Power Liftgate Battery Draw Conditions
April Service Newsletter from the Experts at GM TAC
New Design Intake Manifold Addresses Poor Engine Performance
Free Spinning or Grinding Starter Sounds
May Service Newsletter from the Experts at GM TAC
New Battery Cell Chemistry Identification
GM Service Know-How Emerging Issues
New Trailer Tire Pressure Sensors Offer Increased Capability
Inoperative USB Port Diagnosis
Avoid the TUN# Label When Cleaning Transmission Cases
High-Pitched Whistling Sound at Idle
GM Dealer Equipment (GMDE)
TAC Newsletter June 2024
TAC Newsletter May 2024
Techline Connect Tips June 2024
