Avoiding HVAC Blower Motor Parts Return Damage
Many times, common warranty repairs like HVAC blower motor replacements require that the part be returned to GM. Just like other vehicle components that are returned under warranty, HVAC blower […]
Newly Arrived EVs May Not Charge
Some 2024 Silverado EV, HUMMER EV and HUMMER EV SUV models that have just arrived at the dealership may not charge initially when the vehicle is connected to a Level […]
High Resistance in Ground Straps
There may be high resistance in the G132 and G133 grounds, located behind the right-hand wheelhouse liner on some 2019-2022 Silverado 1500 and Sierra 1500 models. (Fig. 5) As a […]
Inoperative 110/120-Volt Power Outlet
The 110/120-volt power outlet may be inoperative on some 2020-2023 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD models. Vehicles may have two alternating current power outlets, located in the cab on the […]
Forward Collision Alert Indicator On at All Times
Some 2020-2024 XT5 and XT6 models may have the Forward Collision Alert indicator shown on the windshield at all times. (Fig. 9) The indicator may be on any time 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. This month the seminar recaps several electric vehicle topics. (Fig. 8) Fig. 8 […]
December 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 December GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
DCBS Warranty Requirement Deadline Extended
GM has extended the use of the EL-50313 Midtronics GR8 Battery Tester/Charger for battery charging and diagnosing 12V batteries under warranty to the end of September 2024. Beginning October 1, […]
Window Indexing After Loss of Vehicle Power
When opening the doors with the side windows fully closed on all HUMMER EV models, window indexing automatically lowers the window a small amount. Once the door is closed, the […]
Transmission Park Lock Position Sensor Measurement
Some 2020-2024 Corvettes may have a no start condition or the vehicle may not shut down. In some cases, these conditions may lead to a drained battery. There also may […]
2024 Blazer EV Shows Off New Technology
The 2024 Blazer EV is the latest addition to the GM electric vehicle lineup that is athletic and aggressive in both styling and performance. But it also features some exciting […]
Diagnose Non-GM Vehicles with the TechPRO Professional Aftermarket Diagnostic App
The MAHLE TechPRO Professional Aftermarket Diagnostics application (Fig. 9) was recently introduced by GM Customer Care and Aftersales to help U.S. dealerships with diagnosing non-GM vehicles. The diagnostic app provides […]
HUMMER EV 37-Inch Tires Calibration
HUMMER EV trucks feature standard 35-inch tires that are specially engineered to deliver outstanding traction and towering ground clearance. (Fig. 12) In addition, the pickup can fit tires up to […]
Side Obstacle Detection Module Installation
The Rear Cross Traffic Alert and/or Side Blind Zone Alert system (Fig. 14) on some 2021-2023 Tahoe, Suburban, Yukon and Escalade models may not detect certain vehicles. A “system unavailable” […]
6-Speed Automatic Transmission Oil Filter and Seal Now Available Individually
A change has been made to the Transmission Oil Filter and Seal Kit (part number 24236933) (Fig. 18) for the 6L50 (RPO MYB), 6L80 (RPO MYC) and 6L90 (RPO MYD) […]
Wheel Drive Shaft Damage
Damage to the wheel drive shaft threads (Fig. 1 and 2) may occur if power tools are used to remove the wheel drive shaft nut on some 2021-2023 XT5, XT6, […]
Shift Concerns on 8-Speed Transmissions
The 8-speed automatic transmissions (RPO M5N, MNU, M5U, M5X, MHA, M5T, MQE, MQD) in some 2015-2018 Corvette; 2015-2020 Escalade, Yukon; 2015-2023 Silverado 1500, Sierra 1500; 2016-2018 CTS; 2016-2019 ATS, CTS; […]
Loose Connection at Connector X175
A number of powertrain DTCs may be set along with an illuminated Check Engine MIL on some 2023-2024 Colorado, Canyon; 2024 Silverado 1500 and Sierra 1500 models equipped with the […]
November 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 November GM Technical Assistance Center (TAC) Newsletter. It covers a number of […]
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 takes a look at the new 2024 Corvette E-Ray. […]
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Previous Articles
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 Service Know-How Emerging Issues
2024 Essential Tool Forecast
Headlamps Flashing Due to Low Battery Charge
PicoScope Recording for CVTs with Noise Concerns
Dual Clutch Transmission MCVM PUN Characterization
Shift to Park Message
2024 Technician Excellence Program Rewards Dealership Technicians for Training Achievements
Hands-Free Start Power Modes
Poor Ground Path Condition
Inoperative Trunk Latch
GM Dealer Equipment (GMDE)
TAC Newsletter April 2024
TAC Newsletter March 2024
Techline Connect Tips March 2023
