Archive for September 2017

Using the TransFlow Transmission Oil Cooler Flush and Flow Test Tool

GM studies indicate that restricted transmission oil flow is detrimental to the life of any automatic transmission. Plugged oil coolers and oil cooler line restrictions cause insufficient transmission lubrication and elevated operating temperatures that can lead to premature transmission failure. Many repeat repair cases can be prevented by following published procedures for transmission oil cooler flushing and flow checking to ensure there is proper flow through the transmission oil cooler.


The DT-45096 (previously J-45096) TransFlow® transmission oil cooler flush and flow test tool (Fig. 1) can be used to flush and flow test the transmission oil cooler and the oil cooler pipes after the transmission has been removed for repairs. The TransFlow tool is designed to measure oil flow capability within the transmission oil cooler and performs a flow rate test meeting GM flow rate specifications. It is a self-contained unit using a 12-volt flow meter, shop air supply and DEXRON VI automatic transmission fluid (ATF).


Fig. 1


The DT-45096 TransFlow tool uses conventional automatic transmission fluid as the cleaning agent. It doesn’t use any detergents, chemical cleaning agents or hot water, so there is no hazardous waste to dispose of.


If the transmission fluid requirement for the vehicle is different than DEXRON VI, flushing the cooler with DEXRON VI is an acceptable service procedure. Very little fluid remains in the cooler after the flush procedure. After performing the flush and flow test, use compressed air to blow the residual transmission fluid out of the oil cooler and lines.


Time allowance for performing the transmission oil cooler flushing and flow checking procedure has been included in the appropriate labor time guide operations since the 1987 model year.


The DT-45096 TransFlow includes:

  • 32 quart (30 liters) supply vessel
  • 34 quart (32 liters) waste oil vessel
  • Air pressure supply fitting
  • Digital flow rate indicator
  • 12V DC power cable
  • Black supply oil hose with quick connect fitting
  • Clear waste oil hose with quick connect fitting


TIP: A new Operation Manual has just been released with updated information along with a new Adapter Application Chart. The new manuals are available under the Support tab for the DT-45096 (previously J-45096) tool at (Fig. 2)


Fig. 2




The TransFlow equipment is connected to the vehicle’s transmission oil cooler lines using the current cooler line adapters. Two adapters are included with the TransFlow. Five other adapters also are available. The most commonly used adapters are the DT-45096-30 (for 6-speed, 8-speed and 10-speed longitudinally-mounted transmissions) (Fig. 3) and DT-45096-50 (for 6-speed and 9-speed transverse-mounted transmissions). (Fig. 4)


Fig. 3


Fig. 4


In the flush mode, air pressure forces clean transmission fluid through the oil cooler and lines, removing dirty oil and blockages. To enhance the cleaning action, the oil is agitated with bursts of air. The cooler is flushed first in the backflush direction, then the normal flow direction. Waste oil is collected in a built-in waste tank.


Flow Test


After flushing, use the digital flow rate indicator in the DT-45096 to perform a flow test. The flow test indicates whether the oil cooler and cooler lines still have restrictions, which must be addressed before the repair is completed.


An electronic flow meter is used to measure the minimum flow capability of the transmission oil cooling system. A digital display indicates the ATF flow rate in gallons per minute (GPM) along with the amount of ATF in the supply vessel, supply vessel ATF temperature, machine cycles and the operating mode.


Insufficient oil flow through the transmission oil cooling system will cause premature transmission failure. The required minimum ATF flow rate reading is directly related to the supply oil temperature. In addition to transmission fluid temperature, minimum flow rates vary depending on whether the oil cooler is made of aluminum or steel.


Refer to the flow rate chart for the oil flow rate specification based on the temperature of the ATF in the supply vessel. The User’s Manual and the Service Information include minimum flow rate charts. Refer to the appropriate Service Information for complete flow rate information for the model and cooling system being tested.


The published flow rates are based on the tool calibrated at 2.0 GPM (7.6L/minute) using ATF at 65° F (18° C) with 90 psi of air pressure. Dealership tools should be calibrated using the same specifications. (Fig. 5) If the tool is set up with higher temperature ATF, then artificially high flow rates could be seen. Remember, the tool is only measuring minimum flow rates. Fluid warmer than room temperature may result in higher self-test readings.


Fig. 5


The entire flushing and flow test procedure takes only 5-8 minutes. The waste tank can be emptied either using a suction hose in the port provided or by draining from the built-in drain fitting at the bottom of the tank. In either case, the waste oil can be disposed of the in the same manner as any other drained transmission fluid.


After the flow test, the following information is displayed:

  • Tested flow rate in GPM
  • Temperature in degrees Fahrenheit
  • Cycle number
  • 7 or 8-digit alpha/numeric flow code. This flow code must be written on the repair order for the warranty claim.


Self-Test Flow Rate


If an oil cooler fails the flow test, repeat the flow test to confirm the condition. If it fails again, disconnect the tool from the cooler lines and run the TransFlow self-test procedure to verify flow is 2.0 GPM (7.6L/minute) or greater using ATF at 65° F (18° C) with a minimum 90 psi of air pressure. The self-test should take no more than two minutes to complete.


TIP: Refer to the Useful Information/Helpful Hints section of the User’s Manual for additional information on the self-test procedure.


If you are having difficulty obtaining the 90 psi of shop air required to run the TransFlow tool:

  • Connect an accurate pressure gauge between the TransFlow air inlet and the shop to verify the pressure going into TransFlow from the shop air supply is at least 90 psi and there are no obstructions in the shop line.
  • Connect TransFlow to an air line that is closer to the service compressor.
  • Check the service compressor’s pressure.
  • Connect to the body shop air line, which may be at a higher pressure.


Transmission Fluid Temperature


The ATF in the supply vessel must be greater than 65° F (18° C). This is the minimum required operating temperature. Below 65° F (18° C), the TransFlow will shut off. Below this temperature, it is difficult to accurately measure the flow of transmission fluid.


– Thanks to Chuck Berecz, Mark Kevnick and Dan Popoff

Tamper-Proof Drive Bit Set for Emissions Components

The Positive Crankcase Ventilation (PCV) system and other components that affect emissions, but do not turn on the Check Engine lamp if there is a malfunction, are required by the Air Resource Board (ARB) to have tamper-proof fasteners to prevent removal or modification. During service, the fasteners are destroyed if they must be removed, and new tamper-proof fasteners must be installed.


Tamper-proof fasteners can be found on 2016-2018 GM models equipped with the following engines:

  • 4L Gas engine (RPO LE2, LV7)
  • 5L Gas engine (RPO LFV, L3A, L3G)
  • 0L Gas engine (RPO LTG)
  • 6L Duramax diesel engine (RPO LGH, LML, L5P)


Tamper-Proof Drive Bits


The GR-6 bits in the Tamper-Proof Drive Bit Set (EN-50956-A) will install a fastener only, making it ARB compliant. The set includes three tamper-proof bits, and replaces the single bit (EN-50956) (Fig. 6) previously released.


Fig. 6


The tamper-proof fasteners were originally used only on diesel engines, but gasoline applications have been added recently. The tamper-proof fasteners are used to attach various emission-related components, such as the oil separator to the valve cover, the oil drain pipe to the front cover on diesel engines, and components in the intake and PCV systems on gasoline engines.


Service Examples


An example of where tamper-proof fasteners are used is the air cleaner outlet duct on a 2017 Spark equipped with the 1.4L gas engine (RPO LV7). The Service Information instructs to remove the air cleaner outlet duct by using a suitable tool to cut a slot in the tamper-resistant PCV bolt heads (1) and remove them with a flat-bladed tool. (Fig. 7) Discard the bolts after removal. Installing a new air cleaner outlet duct with the PCV tube and valves to the engine requires using the EN-50956 tamper-proof drive bit.


Fig. 7


On 6.6L Duramax diesel engines, a tamper-proof fastener can be found on the PCV oil separator. (Fig. 8)


Fig. 8


– Thanks to Chuck Berecz and Michael Adamczyk


Diagnosing the Selective Catalyst Reduction System

The Check Engine MIL may be illuminated and DTC P20EE (NOx Catalyst Efficiency Below Threshold) may be set on some 2017-2018 Silverado and Sierra models equipped with the 6.6L Duramax diesel engine (RPO L5P). There may be several reasons why DTC P20EE has set, even when the Selective Catalyst Reduction (SCR) system is functioning properly.


The SCR system reduces oxides of nitrogen (NOx) emissions by injecting a metered amount of Diesel Exhaust Fluid (DEF), or reductant, into the exhaust gas stream entering the SCR. Within the Selective Catalytic Reduction Catalyst, the reductant reacts with the NOx to form nitrogen, carbon dioxide, and water vapor. Upstream and downstream NOx sensors provide the Engine Control Module (ECM) with engine-out and tailpipe-out NOx levels.


Check the following items to help determine if the vehicle’s SCR system is operating correctly.


Check for other DTCs

  • Complete repairs as needed for any other DTCs.
  • Clear all DTCs.


Verify DEF (or Reductant) Concentration

  • Using a scan tool, check the reductant concentration in the reductant system data.
  • The reductant concentration temperature reading may be inaccurate if the reductant is frozen or contains ice crystals. If the reductant temperature is below 25 degrees F (–4 degrees C), warm the fluid in the tank (Fig. 9) by parking the truck in a warm environment until the DEF tank temperature is warmer than 25 degrees F (–4 degrees C).
  • If the concentration is not between 28.8% and 36.2%, replace the DEF and continue with the following steps.


Fig. 9


Run the Emission Reduction Fluid Injector Quantity Test

  • If the test does not pass, refer to Emission Reduction Fluid Injector Quantity Test in the appropriate Service Information and then re-run the test.


Perform the Reductant System Malfunction Warning Service Bay Test

  • Warm the vehicle to proper operating temperature; otherwise the Reductant System Malfunction Warning Service Bay Test may time out.
  • If the test passes, return the vehicle to the customer.
  • If the test fails, repeat the Reductant System Malfunction Warning Service Bay Test up to 2 more times. If the test fails after 3 attempts, refer to the DTC P20EE service procedure in the Service Information.


For additional information, refer to #PIP5510B in the Service Information.


– Thanks to John Stempnik


New Global Electronic Parts Catalog Release Delivers Better Results

The latest update to the GM Global Electronic Parts Catalog (EPC) includes several new features that make it easier and more convenient to search for parts and to quickly find the right parts information. GM dealerships can access the EPC through the GM GlobalConnect Parts Workbench.


Search Results in Main Window


One new feature included in the latest release is a single screen in which to search for a part, view an illustration, and add the part to the shopping list — all within the main content area of the EPC. The search results include the same accurate data, but with the results right in the main EPC screen, it’s easy to quickly change vehicles, VINs, or groups without closing the window.


From the search screen, the search can be refined by using the drop-down menu for the make/year/model & Group information. (Fig. 10, A)


A new search using the same VIN can be performed by selecting the Reset button at the top of the screen. (Fig. 10, B) All previously identified parts and the Noun / Part Number, Group and Without search terms are cleared, but the entered VIN is retained. To remove the VIN, select All Makes from the Within drop-down menu, or enter a new VIN.


Fig. 10


Graphic-Driven Navigation


To search using part illustrations, set the Catalog Navigation Style to “Graphical.” (Fig. 11) With the Graphic-Driven Navigation selected, graphical shortcuts can be used when searching to jump right to a particular location. Navigation can be done manually or with a VIN.


Fig. 11


Flashing “I” Note Icon


When viewing an illustration of a part, any important notes will appear with a yellow paper icon above the illustration. Illustration RPO notes are identified with a plain yellow paper icon. If an illustration has a note other than RPO list items, such as user notes or distributor notes, the yellow paper note will appear with flashing “I” on the note icon. (Fig. 12) Select the icon to view the additional information.


Fig. 12


MyPriceLink® Portal


The latest release also includes a new button above the shopping lists that enables all part numbers to be copied, up to 100 part numbers. (Fig. 13) The copied part numbers can be easily entered into the MyPriceLink portal when pricing parts.


Fig. 13


After entering the necessary MyPriceLink information in the Vehicle and Payer section, click the Part Number section and right-click to paste the copied part numbers. Select the Get Price button and follow the normal procedures to continue in the portal.


Launch ACDelco Catalog from Any Screen


The ACDelco catalog also can now be launched directly from any screen in the EPC. Click the ACDelco icon at the top right of the screen to access the catalog. (Fig. 14)


Fig. 14


For assistance or technical support on using any features of the Global Electronic Parts Catalog, send an email to or contact the GM EPC Technical Support help desk at 1-888-994-6372.


– Thanks to Mary Daly

Take the 2017 TechLink Reader Survey

At TechLink, we cover a wide range of GM service topics, from the latest diagnostic and technical repair information to new model features, special tools and more. It’s our mission to provide the latest GM technical news and repair information so that you can quickly and accurately repair the vehicles that come into your service department every day.


Fig. 15


To help us toward that cause, we would like to hear from technicians and other service department professionals in GM dealerships about the topics we cover. What information should we highlight? How much should we cover on different topics? Your input will help in determining the coverage of future editions. So which topics are of interest and value to you?


Click the Survey button or click the Survey link on the right side of the home page to take a short survey about the information you want most in TechLink.



Your input is very important to us. Thanks for taking the time to complete the survey. We’ll share the results soon.


– Thanks to Lisa Scott

Get Real-Time Feedback with the TAC Dealer Case Management System

Did you know the new Dealer Case Management (DCM) system allows U.S. GM dealership service technicians to create, view, and update GM Technical Assistance Center (TAC) cases in real-time? DCM increases the speed and efficiency of case management to help improve communication with technicians, and in turn, enhance the quality and service experience for GM customers.


Using the DCM system, technicians have the ability to quickly communicate back and forth with TAC advisors. (Fig. 1) There is no need to take notes because all communication is documented in the DCM system. A list of case activities at the bottom of the screen show how the case has progressed as well as its current status.


Fig. 1


Currently, users are averaging less than a 15-minute response time for feedback on a case, which means technicians spend less time on the phone and more time addressing customer concerns and building stronger customer relationships.


Dealer Case Management App


To access the DCM, go to the App Center on GlobalConnect. Select Service from the Department drop-down menu and then select Dealer Case Management System & Resources from the list of apps. The DCM launch box will appear. Click the Launch button to open the application. (Fig. 2)


Fig. 2


The system includes case management for the Voice of the Customer (VOC), Customer Assistance Center (CAC), and Technical Assistance Center (TAC). With these systems combined, dealerships can manage all customer issues from one central location.


Training Aids


There are several training aids available for learning about how to use the DCM system. To begin, select the App Resources button that is included in the DCM launch box on GlobalConnect.


From the DCM training main page, select the link to TAC to access specific training materials about using the DCM system for TAC cases. (Fig. 3)


Fig. 3


The training page includes training developed for each specific business unit. It features various types of learning methods based on your preference, including:

  • DCM Reference Guide
  • How-to videos (Fig. 4)
  • Center of Learning Web-based training (four part module)
  • Recorded WebEx sessions
  • Job aids


Fig. 4


Under the Getting Started with TAC tab, technicians can review some of the basics about using the DCM system, such as:

  • How to open a TAC case
  • How to review a TAC case & add attachments
  • How to request to close a TAC case
  • How to search for existing TAC resolutions


TIP: Also check out course VMVDC.M17W2 Dealer Case Management: Technical Assistance Center (TAC) Case Handling on the Center of Learning. It’s a short, interactive course for service technicians.


These DCM TAC FAQs also provide more information. (Fig. 5)


Fig. 5


– Thanks to Elizabeth Hathaway


New GDS2 Core Software Update

A new version (18.1.161) of the GDS2 core software has been released recently. The update includes numerous software bug fixes.


To download the software update, click the GDS 2 icon on the TIS2Web home page. (Fig. 6)


Fig. 6


When updating from one core version of GDS2 to the next, the dealership firewall/antivirus program will recognize it as a new application. You may need to engage your local dealership IT support to ensure GDS2 is entered as an exception in the security programs to allow normal functionality.


Users also need full administrative rights to install the GDS2 core update. If any issues are encountered with GDS2 not functioning properly, right click on the GDS2 icon on the desktop and select “Run as administrator.”


For assistance, contact the Techline Customer Support Center (TCSC) at 1-800-828-6860 (English) or 1-800-503-3222 (French).


– Thanks to Chris Henley

New Universal Refrigerant PAG Oil for R-1234yf A/C Systems

GM has recently released a new refrigerant PAG (Polyalkylene Glycol) oil (Fig. 7) specifically engineered to service GM vehicles built with belt-driven air conditioning (A/C) compressors that use the environmentally-friendly alternative refrigerant R-1234yf.


Fig. 7


Previously, there were multiple PAG oils released to service GM vehicles using R-1234yf (using belt-driven A/C compressors), which required technicians to refer to the Service Information during every A/C service to ensure the correct PAG oil was used.


With the universal PAG oil, the A/C repair process is simplified. Now, there are only two PAG oils needed (for R-1234yf systems and R-134a systems) when servicing GM cars built with belt-driven A/C compressors. (Fig. 8)


Fig. 8


It is acceptable to use any existing inventory of the previously released R-1234yf PAG oils provided that it is the correct oil part number for the specific A/C system. If using a previously released, non-universal oil, always refer to Service Information to ensure the correct refrigerant oil is being used.


Oil Injection Tool


The new universal R-1234yf refrigerant PAG oil comes in the same 8 oz. (240 ml) tubes just as the previous refrigerant PAG oil. These cartridges are designed to be used with oil injection tool GE-45037. (Fig. 9)


Fig. 9


High Voltage Electric A/C Compressors


For high voltage electric A/C compressors (Fig. 10), use only POE (Polyolester) refrigerant oil (GM PN 88862657, U.S., and 88862658, Canada). GM only has one POE oil released for service at this time.


Fig. 10


Current Refrigerant Oils

– Thanks to Chris Semanisin

Left-Hand Thread Cooling System Pressure Test Adapter

The cooling system surge tank for 2017 Silverado and Sierra models equipped with the 6.6L Duramax diesel engine (RPO L5P) features a new design with two tank caps. The fill cap on top of the tank uses a left-hand thread and requires a Cooling System Pressure Test Adapter to pressure test the system.


The tank is placed at a low position in the engine compartment, in relation to the engine, due to space constraints. Based on its location, the tank was designed to have the coolant at the top and the air portion at the bottom of the tank to ensure that the coolant will be at the highest level in the cooling system.


Vented and Non-Vented Tank Caps


The cap located on the lower outboard side of the tank is a standard vented cap with right-hand threads that vents excessive cooling system pressure. (Fig. 11, #2) The cap on the tank top is a non-vented fill cap and has left-hand threads (Fig. 11, #1); this eliminates any attempt at installation of non-vented cap where a vented cap is required. Turn the fill cap clockwise to remove the cap or counter clockwise to install it.


Fig. 11


The top tank cap has two seals (the side surge tank cap also has two seals) to protect from hot fluid exiting through the top portion of the neck itself during hot engine conditions.


Cooling System Leak Testing


The Cooling System Pressure Test Adapter (GE-52098 or GE-52098-A) is a left-hand adapter (Fig. 12) that threads on the tank to allow pressure testing of the cooling system using the previously released Cooling System Pressure Tester (Essential tool J-24460-A, or EN-24460-A).


Fig. 12


The Cooling System Pressure Test Adapter also includes a center core with O-rings that seals off the tank vent port so the test can be run correctly. (Fig. 13) Due to the fill cap being a non-vented cap, an adapter to pressure test the fill cap is not needed.


Fig. 13


TIP: During testing, do not exceed the pressure rating that is printed on the vented cooling system surge tank cap on the lower side of the tank. The cooling system should hold the rated pressure for at least two minutes. Observe the gauge for any pressure loss and inspect the cooling system for any system leaks.


The Cooling System Pressure Test Adapter (GE-52098 or GE-52098-A) is available through


– Thanks to Chuck Berecz and Chris Semanisin


Updated 11/20/17

Common Questions on the New 2018 Terrain

The all-new 2018 GMC Terrain is available with a variety of new features that may be unfamiliar to some customers, who may bring their vehicle into the dealership for service when a system is operating as designed. Be prepared to explain how a particular system operates if your customers ask the following common questions about the new Terrain.


Where can I find more information about all the functions of the new infotainment system?


The next generation of infotainment systems available on the Terrain feature either a 7-inch (178 mm) or 8-inch (203 mm) touchscreen, integrated OnStar features, and personalized, cloud-based user profiles. (Fig. 14) The functionality of the three available systems varies. Apple CarPlay and Android Auto compatibility is standard on all systems. A number of connectivity features are optional, depending on the system.


Fig. 14


Detailed information and videos can be accessed on the GMC owner website at (in Canada, go to Select the 2018 Terrain using the drop-down menus and select Learn About Your Vehicle.


Can the Navigation SD card be used in another vehicle?


The infotainment systems equipped with available navigation (RPO IOU) and standard navigation (RPO IOT) have the map data stored on a SD card. Each Nav SD card is VIN-specific and RPO-specific and cannot be used in another vehicle. If the card is inserted into the SD card slot of another vehicle, the message “SD CARD ERROR” will be displayed on the infotainment screen.


Why does the hands-free power liftgate only work intermittently?


If the power liftgate is equipped with hands-free operation, the liftgate can be opened or closed by using a straight-ahead kicking motion (not a side-to-side sweeping motion) under the rear bumper. The location of the rear bumper sensor is between the left exhaust pipe and the license plate. (Fig. 15) The key fob must be within 3 feet (1 meter) of the liftgate.


Fig. 15


TIP: The liftgate will fully open when the power liftgate control knob is in the MAX position. It also can be programmed to open to a lower height when the control knob is in the 3/4 position.


For additional information about the hands-free liftgate, review Bulletin #17-NA-153.


Why is Lane Keep Assist not functioning?


The customer may be expecting a warning chime when the Lane Keep Assist with Lane Departure Warning system is active. However, there is not a warning chime if the system determines the driver is actively steering.


Lane Keep Assist will provide steering input to gently turn the steering wheel to help center the vehicle in the traffic lane if the vehicle approaches a detected lane marking without using a turn signal in that direction. The Lane Keep Assist icon is green on the instrument cluster if the system is available to assist. The Lane Keep Assist icon will turn amber when the system is providing steering input. As the driver actively steers the vehicle, the steering input and amber indicator may not be noticed.


If the driver does not actively steer the vehicle and crosses the lane marking without using a turn signal in that direction, the Lane Departure Warning will then provide a warning by flashing the amber icon and pulse the Safety Alert Seat or sound a chime/beeps (if selected in the Settings menu).


TIP: The Safety Alert Seat settings can be changed by going to Settings > Vehicle > Collision/Detection Systems > Alert Type on the infotainment system. Audible beeps or seat pulsing alerts may be selected.


The Lane Keep Assist system can be turned on/off using the button on the center console. (Fig. 16)


Fig. 16


For additional information about the Lane Keep Assist system, review #PIT5481B.


Why does the engine turn off at a stop?


The Terrain features Stop/Start technology to help conserve fuel and provide better fuel economy. The system shuts down the engine when the vehicle comes to a complete stop, referred to as an Auto Stop, if operating conditions are met. To indicate an Auto Stop, the tachometer will read AUTO STOP. The audio system, climate controls and other accessories will continue to operate. The engine will restart upon releasing the brake pedal or applying the accelerator pedal. The tachometer will read OFF when the engine is turned off using the ignition pushbutton. (Fig. 17)


Fig. 17


The engine may not turn off at a stop or may restart if any of the following conditions apply:

  • A minimum vehicle speed is not reached.
  • The engine or transmission is not at the required operating temperature.
  • The outside temperature is not in the required operating range.
  • The shift lever is in any gear other than Drive (D).
  • The battery charge is low.
  • The climate control system requires the engine to run based on the climate control or defog setting.
  • The Auto Stop time is greater than two minutes.


Why does the outer window belt molding look out of position?


The outer window belt moldings on some 2018 Terrain models may have poor fit and retention to the doors. (Fig. 18) The original design of the belt moldings did not provide a proper fit to the door surface. If this condition is found, replace the outer window belt moldings with revised moldings that are now available.


For additional information and part numbers, review Bulletin #17-NA-246.


Fig. 18


– Thanks to Kris Villegas

New TAC Action Centers for CT6 Super Cruise and Enclave

The GM Technical Assistance Center, or TAC, (U.S.) has established Action Centers for the 2018 Cadillac CT6 equipped with Super Cruise (RPO UKL) (Fig. 19) and the 2018 Buick Enclave. (Fig. 20)


Fig. 19


TAC Action Centers are designed to gather early feedback and provide support for the introduction of new GM models. Dealership service departments are asked to report all vehicle issues that require immediate attention, not just concerns that require technical assistance. The goal is to develop a quick resolution to any product concerns, such as fit and finish, performance, and operation.


Fig. 20


TAC Action Centers have a direct connection to GM Engineering, Brand Quality and the assembly plant, which offer combined resources to immediately address product concerns seen in the dealership. Each TAC case is sent out to hundreds of people representing engineering, manufacturing, aftersales and other organizations across GM.


If any concerns are encountered with the new CT6 with Super Cruise or Enclave in your dealership, contact the Technical Assistance Center. After entering your dealership’s BAC code, select the prompt for Action Centers.


– Thanks to Steve Jacob

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