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Super Cruise Update Provides Messaging Features

A new software update is now available for the 2018 CT6 equipped with Super Cruise (RPO UKL). The update includes new instrument cluster messaging (Fig. 1) that explains why Super Cruise is unavailable or needs to disengage, enables easier Super … Continue reading

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QR Code on Certification Label Offers More RPO Codes

Beginning with the 2018 model year, a QR code was added to the Certification label (Fig. 3) on all Buick, Cadillac, Chevrolet and GMC models. The new QR code includes the Vehicle Identification Number (VIN), RPO codes and other information … Continue reading

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Low Air Conditioning Refrigerant Charge or Leak

Some 2017-2018 Silverado, Tahoe, Suburban, Sierra, Yukon models and Escalade models may have a low refrigerant charge or a refrigerant leak. As a result, the air conditioning system will be inoperative or have insufficient cooling performance. If this condition is … Continue reading

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Lack of Power When Accelerating

The following conditions at low speeds may be found on some 2015-2016 Colorado and Canyon models equipped with the 3.6L V6 engine (RPO LFX): Chugging and/or lack of power when accelerating at speeds of 12-15 mph (19-24 km/h) in 2nd … Continue reading

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Properly Connect Sensors during Air Distributor Case Replacement

Some 2016-2017 Envision models may have warm air blowing through the rear HVAC vents when the air conditioning is commanded on. If this condition is found, the auxiliary temperature valve inside the A/C distributor case may be fractured, with the … Continue reading

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Audio Conditions after TIS2Web Amplifier Programming

After replacement or programming the amplifier on some 2015-2017 Silverado, Tahoe, Suburban, Sierra, Yukon, Escalade and 2014 Silverado 1500 and Sierra 1500 models equipped with infotainment system RPO IO5, IO6 (Fig. 11) or RAO, several audio conditions may be present. … Continue reading

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Missing Speed Limit Icon on Driver Information Center

A side-by-side view of the speed limit icon and digital speedometer may not be available on the Driver Information Center on 2017 Colorado and Canyon models equipped with the RPO IO6 infotainment system. Owners of some 2017 models may question … Continue reading

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New Wireless Charging System Retrofit Kit

Customers who have upgraded to a new smartphone may no longer be able to wirelessly charge their device in some 2015-2016 ELR; 2015-2017, Volt, Tahoe, Suburban, Yukon, Escalade; 2015-2018 Colorado, Cruze, Canyon, ATS, CTS, XTS; 2016-2017 Silverado, Sierra; 2016-2018 Camaro, … Continue reading

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Updated GM Dealer Infrastructure Guidelines Now Available

The latest GM Dealer Infrastructure Guidelines are now available on the GM Dealer Equipment website at www.gmdesolutions.com. Select the Dealer Services tab and then the links to Techline IT Solutions and GM IT Standards to download and view the new … Continue reading

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Discard GE-52098 Coolant System Pressure Test Adapter

Do not use the GE-52098 Coolant System Pressure Test Adapter when servicing the cooling system on 2017-2018 Silverado and Sierra models equipped with the 6.6L Duramax diesel engine (RPO L5P). Remove the GE-52098 Coolant System Pressure Test Adapter (Fig. 5) … Continue reading

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Properly Connect AFIT Cables to Avoid TCM Damage

The Active Fuel Injector Tester (AFIT) Spark Ignited Direct Injection (SIDI) Diagnostic Kit, essential special tool CH-47976-500A, was released several years ago to test fuel injectors on port and direct injected engines going back to the 1996 model year. It’s … Continue reading

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Service Know-How

10218.05V – Emerging Issues May 10, 2018 The latest service topics from GM Brand Quality and Engineering are covered, including replacement of the Corvette convertible top cover (Fig. 11) and tips on proper tire seating when using the Hunter Revolution … Continue reading

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Updating the Super Cruise Digital Map Module

The Digital Map Module (DMM) used in the Super Cruise system on the 2018 CT6 (Fig. 1) determines the vehicle’s position and localization and communicates navigational and predictive data of the most probable path of the vehicle, providing critical information … Continue reading

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Common Questions on Super Cruise Operation

The Super Cruise™ system available on the 2018 Cadillac CT6 automatically steers the vehicle when driving on a limited-access freeway, allowing drivers the convenience of hands-free driving. (Fig. 6) Because this advanced technology is new, some customers may have a … Continue reading

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AFIT USB Cable for Windows 10

When updating the Active Fuel Injector Tester (AFIT) (CH-47976) software, some users may receive a notice about the AFIT USB cable (CH-47976-3) that is used to connect the Main Control Unit (MCU) to a computer. (Fig. 9) The original USB … Continue reading

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HVAC Pop-up Display Shows Incorrect Temperature

The climate controls pop-up display may show an incorrect temperature setting on some 2018 Terrain models. The Heating, Ventilation and Air Conditioning (HVAC) temperature setting shown on the temperature control knobs (Fig. 11) will indicate the correctly set temperature, but … Continue reading

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Flow Chart for Infotainment System Display and Audio Conditions

The radio/tuner, radio control/display/Integrated Center Stack (ICS) and Human Machine Interface (HMI) have been placed on restriction for many 2018 GM models. If any of these parts need to be replaced, the Technical Assistance Center (TAC) must be contacted before … Continue reading

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Install API Manager Message Displayed After Radio Replacement

When downloading or launching an app after a radio replacement on some 2017-2018 CTS; 2018 ATS, XTS and Terrain models equipped with infotainment system RPOs IOU or IOT, the message “Please Install API Manager through AppShop” may be displayed. (Fig … Continue reading

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Recovery of Failed USB Radio Programming

If an error occurs during USB radio programming on some 2017-2018 CTS; 2018 ATS, XTS and Terrain models equipped with infotainment system RPOs IOS, IOU or IOT, an “Update failed. Return to dealer.” message may be displayed. (Fig. 2) Fig. … Continue reading

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Repair for Suspension Leans to the Left Condition

Some 2015-2018 Colorado and Canyon models (Fig. 3) may appear to be leaning slightly toward the left side due to the mass distribution of the vehicle. If this condition is noticed, installing a shim on the rear left-side of the … Continue reading

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Latest GDS2 Core Software Updates VIN Field

The latest update to the GDS2 core software (Version 20.0.18400) in TIS2Web, released April 23, 2018, includes changes to the VIN field on the Vehicle Selection screen. After updating the core software, when a user connects to a vehicle, the … Continue reading

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White Powder Appearance on A/C Line

The appearance of white powder below the air conditioning lines in the engine compartment may be noticeable on some 2017-2018 Colorado and Canyon models. (Fig. 8) Fig. 8 The powder substance is not corrosion. It is most likely caused by … Continue reading

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Honoring Our Heroes Silent Auction Offering Special Edition Tool Boxes

GM Customer Care & Aftersales, GMC and GMC dealers are hosting the 6th Annual Honoring Our Heroes Gala to help raise funds to build custom-designed, mortgage-free Smart Homes that meet the needs of our nation’s most catastrophically injured service members … Continue reading

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Preventing an Inadvertent Airbag Deployment

It’s simple. If you work on any components of the Supplemental Inflatable Restraint (SIR) system without disabling the system, you run the risk of an inadvertent airbag deployment, which is dangerous and costly. Here’s a possible scenario. A vehicle comes … Continue reading

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