Archive for January 2017

All-New 2018 Equinox Hits the Road

The new 2018 Equinox (Fig. 1) is a five-passenger, four-door crossover available with front-wheel-drive (FWD) or all-wheel-drive (AWD).


The new Equinox is approximately 400 pounds (180 kg) lighter than the current model, which is a 10 percent reduction in weight, improving handling performance and fuel efficiency. Fuel economy also is enhanced by electronically controlled aero shutters in the upper and lower grilles.


Fig. 1




A range of three direct injection, turbocharged 4-cylinder engines are available, including a 1.5L gasoline engine (RPO LYX) paired with the 6T40 6-speed automatic transmission (RPOs MNH, MNK), a 2.0L gasoline engine (RPO LTG) matched with GM’s new 9T50 9-speed automatic transmission (RPO M3D), and a 1.6L turbo-diesel engine (RPO LH7) (Fig. 2) mated to the 6T45 6-speed automatic transmission (RPO MHG). The diesel engine will be introduced later in the year. Fuel-saving Stop/Start technology is standard with all three engines.


Fig. 2


All engines use engine oils that meet the dexos® specification.

  • 1.5L engine – ACDelco dexos1 SAE 0W-20 viscosity grade oil
  • 2.0L engine – ACDelco dexo1 SAE 5W-30 viscosity grade oil
  • 1.6L diesel engine – ACDelco dexos2 SAE 5W-30 viscosity grade oil


The available AWD system has a driver-switchable ON-OFF feature (Fig. 3) that enhances efficiency by disconnecting virtually all of the AWD components from the drivetrain when AWD is not needed, stopping the gears and prop shafts from spinning. The AWD button indicator will flash when engaging AWD and stay illuminated when AWD is active.


Fig. 3


Suspension and Brakes


The new Equinox uses a dual rack and pinion electric power steering (EPS) system. The front suspension is a MacPherson strut design with side-loaded modules, specifically tuned coil springs and a direct-acting stabilizer bar. At the rear is a four-link independent suspension.


17, 18 or 19-inch aluminum wheels are available, depending on the trim level. (Fig. 4)


Fig. 4


All models have standard four-wheel disc brakes with Duralife™ brake rotors. The unique Ferritic Nitro-Carburizing (FNC) surface treatment of the Duralife rotors provides corrosion protection while allowing the brake rotor to wear much slower.


The new low-drag brake calipers are specially designed to ensure that the pad-to-rotor gap is precisely maintained, and that reduced slide forces are kept throughout the life of the vehicle, contributing to improved fuel economy due to less brake drag.


Infotainment Systems


The Equinox features a 7-inch or 8-inch diagonal color MyLink™ infotainment system. The available 8-inch diagonal touch screen has a flat design that’s similar to a tablet. It also offers the ability to download in-vehicle apps to the touch screen via the Shop icon.


To help with accessibility and reduce glare, the touch screen has been moved closer to the driver and is tilted towards the driver’s line of sight. (Fig. 5)


Fig. 5


Both 7-inch and 8-inch systems feature Teen Driver, which allows multiple keys to be registered for beginning drivers and automatically activates certain safety systems. A Report Card records vehicle data. Teen Driver settings can be found in the Settings menu.


The available Wireless Charging system is located at the front of the center console. Compatible mobile phones (accessories may be required) can be placed on the charging pad, face up, for charging when the vehicle is on or Retained Accessory Power is active. The charging symbol will display on the infotainment touch screen when a phone is charging.


Safety Features


The new Equinox offers a number of active safety features and adaptive crash-avoidance systems, including:

• Forward Collision Alert (FCA) with Following Distance Indicator • Lane Keep Assist (LKA) with Lane Departure Warning (LDW) • Low-Speed Forward Automatic Braking (FAB) • Rear Seat Reminder • Safety Alert Seat • Surround Vision • Lane Change Alert (LCA) with Side Blind Zone Alert (SBZA) • Rear Cross Traffic Alert (RCTA) • Front airbags, seat-mounted side impact airbags and roof-rail airbags


The Surround Vision cameras provide a look at the vehicle’s perimeter using four cameras located on each side of the vehicle. However, the cameras do have blind spots and will not display all objects near the corners of the vehicle. Folding side mirrors that are out of position will not display the Surround Vision view correctly. The Surround Vision view is displayed on the infotainment screen along with the view from the front or rear camera. (Fig. 6)


Fig. 6


The Rear Seat Reminder feature monitors the operation of the rear doors. If the rear door is opened and closed within 10 minutes before the vehicle is started or if the rear door is opened and closed while the vehicle is running, the next time the vehicle is turned off after a door activation, the vehicle will sound a chime and display a message on the Driver Information Center. The system doesn’t detect rear seat occupants but serves as a reminder that a person or object may be in the rear seat.


Power Liftgate


The available hands-free programmable power liftgate uses a control knob located on the driver’s door. The knob must be in the Max or 3/4 position for hands-free operation. To open or close the liftgate, kick your foot straight under the driver’s side of the rear bumper, between the exhaust pipe and the license plate. (Fig. 7) The Remote Keyless Entry transmitter must be within three feet of the liftgate.


Fig. 7


Air Deflector Fastener Installation


Fasteners for the rear tire front air deflectors should be installed during PDI. One of the two required fasteners for each rear tire front air deflector is not installed during vehicle assembly. The missing bolts (one per side) and an instruction sheet are included in the loose part bag.


To install the fastener on each rear tire front air deflector, reach under the rocker panel to find the only horizontal fastener location. (Fig. 8) Install the bolt and tighten to 2.5 Nm.


Fig. 8


Special Tools


The following special service tools have been released for the 2018 Equinox:


DT-51983        Installer, Case Side PTU Seal

DT-52000        Installer, Cover Side PTU Seal

DT-51329-A    Prop Shaft Remover

CH-52075        Fuel Pump Lock Ring


For additional information on the new 2018 Equinox, refer to Bulletin #17-NA-020.


– Thanks to Tyler Greenhill and Sherman Dixon


Quick Learn Procedure for 2017 Keyed Models

New for 2017, two keys that are already programmed need to be present in order to use the quick learn procedure for adding keys to GM models (Fig. 9), excluding 2017 Acadia Limited, Enclave, Traverse, Express and Savana. On 2016 and earlier models, only one learned key is needed to perform the quick learn procedure.


Fig. 9


Programming Additional Keys


To program a new key for keyed vehicles:

1.     Insert the original, already programmed key in the ignition and turn the key to ON/RUN.

2.     Turn the key to LOCK/OFF, and remove the key.

3.     Within five seconds, insert the second already programmed key in the ignition and turn it to ON/RUN.

4.     Turn to the key to LOCK/OFF, and remove the key.

5.     Within five seconds, insert the new key to be programmed and turn it to ON/RUN. The theft security light will turn off once the key has been programmed.

6.     Repeat these steps to program additional keys.


TIP: If only one learned key is present, SPS must be used to add additional keys. The quick learn procedure will not complete with only one learned key. Using only one key for the quick learn procedure will cause the theft security light to illuminate when attempting to start the vehicle.


The adding keys procedure does not erase any keys prior to programming. The procedure will simply program the key into the next available slot. Use this procedure when adding an additional key to the vehicle.


If all keys are lost, the 30 minute learn procedure should be used. Once a key is learned with this procedure, all previously known keys will no longer work with the vehicle.


If keys/fobs of vehicles with under 100 miles are lost or damaged in transit/transportation to the dealership, use labor code 0500010.


– Thanks to Theon Tinker and Chris Crumb

Flat/Dinghy Towing 4WD Trucks and SUVs

A Service 4WD message may display on the Driver Information Center and the transfer case may be stuck in Neutral on some 2014-2015 Silverado 4WD, Sierra 4WD; 2015 Tahoe 4WD, Suburban 4WD, Colorado 4WD, Yukon 4WD, Canyon 4WD, and Escalade 4WD models. These conditions may occur when the vehicle is dinghy towed (Fig. 10) or is set up for dinghy towing by disconnecting and reconnecting the battery as outlined in the Owner’s Manual. DTC C0398 (Range Actuator Position – Range Position Correlation) may be set in the Transfer Case Control Module.


Fig. 10


A new software update is available to correct these conditions. If the software has been updated before diagnosis begins, these conditions will not be able to be duplicated. Check for the latest software update before beginning diagnosis.


– Thanks to Steve Schipansky

Headlamp Water Intrusion

A no crank condition or dead battery may be found on some 2016-2017 Silverado 1500 and Sierra 1500 models. Other possible conditions include unable to SPS program the Engine Control Module (ECM) or the engine stays running with the ignition off. DTC P1682 (Ignition 1 Switch Circuit 2) or P129D (Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage) may be set.


While performing diagnostics, voltage may be found on any one of the following underhood electrical center fuses with the ignition off: F26UA, F31UA, F34UA, F39UA, F40UA, or F56UA. These fuses should not have any voltage with the ignition off. This can cause multiple modules to stay awake and lead to a dead battery. These conditions may be intermittent and more apparent during wet weather.


Inspect each headlamp assembly for water intrusion and, if found, disconnect the appropriate headlamp assembly (Fig. 11) and evaluate the condition. Replace the headlamp assembly if necessary. If disconnecting the headlamp assembly does not alleviate the condition, check for water intrusion in the headlamp assembly connections and repair as necessary.


Fig. 11


– Thanks to Kacy McCure

Engineering Information Bulletins and Part Restrictions

Service Know-How

10217.03V – Emerging Issues

March 9, 2017


The latest service topics from Brand Quality and Engineering are reviewed, including an overview of the new 2018 Equinox (Fig. 12) and diagnostic tips for the high pressure fuel pump on the Duramax diesel engine.


(Fig. 12)


To view Emerging Issues seminars:

Log in to

· Log in to

· Select Resources > Video on Demand > GM STC > Search Videos; or

· Select Catalog to search for the course number, and then select View > Take or Continue Course

New Websites and Roles for GM Dealer Services and GM Dealer Equipment

Several changes have been made recently to the different programs available to U.S. dealership service departments for GM dealer services, tools and equipment. New roles and new contacts have been put in place that dealerships can use to shop for tools and equipment, download software, order supplies and check GM guidelines.


Here’s a look at the functions of the Dealer Services, Dealer Equipment, and Special Service Tools websites.


Dealer Services is your new source (Fig. 1) for:

• Techline IT Solutions, including business-grad desktop and laptop computer, tablets, other computer hardware, and the GM Dealer Infrastructure Guidelines. • Warranty Administration, including GM warranty stamps, claims processing service, and management workshops. • Wurth shop supplies and products • Office supplies from Office Depot/OfficeMax, including furniture, printers, and technology equipment.


Be sure to check the GM Dealer Infrastructure Guidelines for the latest recommendations from GM before purchasing any computer equipment. Techline applications require specific specifications in order to function properly in the dealership environment.


Fig. 1


Dealer Equipment is the website (Fig. 2) for the GM Dealer Equipment program. Snap-On Business Solutions in the new facilitator of the program, which now offers expanded customer service hours (7 a.m. CST to 7 p.m. CST), an enhanced web portal, and increased program offerings.


The dealer equipment website includes:

• An online catalog of GM-approved equipment; everything ranging from air conditioning service equipment to wheel and tire equipment. • Green products as part of the GM Green Dealer program, including approved equipment that helps reduce operation costs and improve efficiency. • Dealer-specific pricing and content


Fig. 2


Special Service Tools


Special tools and essential tools are still available through and administered by Bosch. (Fig. 3) A new feature added to the website is the software downloads function for special tools. Software downloads were previously available from the website.


The special service tools website features:

• Keyword/tool number search function to quickly find tools • An online catalog of special service tools and essential tools for all GM models • Monthly tool promotions • Tool organization solutions, including organization management systems; cabinet, cart and peg-board storage systems; and best practices to follow in the shop. • Links to software downloads to update a variety of special tools, such as the Active Fuel Injector Tester (AFIT), Pico Scope NVH tool, and others.


Fig. 3


Software Download Process


The process for special tool updates has changed with the move to the special tools website. To access the software downloads, select the download description for the software needed from the Software Downloads list on the home page. A pop-up window will appear with options to Run or Save the .exe file. (Fig. 4) Follow the tool instructions to update the tool software.


Fig. 4


– Thanks to Lisa Scott, Chuck Berecz and Kent Woiak

Hunter Road Force Balancer Now Essential Equipment

The Hunter Road Force Balancer Generation 5 has been classified as essential equipment for all GM dealerships in the U.S. This latest generation of the Hunter Road Force Balancer (Fig. 5) is a critical part of tire/wheel assembly diagnosis.


Fig. 5


GM reviewed the proposal to classify the Hunter Road Force Balancer as essential equipment with many National Service Clubs and GM Dealer Councils, including the Fixed Operations Advisory Board, Fixed Operations Executive Committee, Cadillac National Service Managers, Buick/GMC National Dealer Council, Chevrolet National Dealer Council and the Cadillac National Dealer Council. Many other Original Equipment Manufacturers (OEM) have also made the Hunter Road Force Balancer essential equipment.


Based on the feedback and suggestions gathered during these meetings, a roll-out plan was developed to get the Generation 5 Balancer to dealerships. Only dealerships that do not have a Generation 3, 4 or 5 Hunter Road Force Balancer will be shipped a new machine. The Generation 3 and 4 machines currently meet GM specifications, but many of these machines may be up to eight years old.


Roll-out Process


Roll-out of the new equipment will begin with Tier 1, 2 and 3 dealerships, followed by the remaining Tier 4 and 5 dealerships. As part of the roll-out process, Hunter will provide:

• A free site survey to determine locations and site requirements at the dealership. • Shipment of the machine to the dealership for installation. • Installation and training at the dealership. • The Hunter Road Force Balancer Generation 5 offers less maintenance and increased speed over other balancers


Generation 5 Advantages


Generation 5 of the Hunter Road Force Balancer roller mimics how a tire/wheel assembly performs under the load of a vehicle to identify hidden causes of vibration and vehicle pull. (Fig. 6) The machine features inner and outer camera assemblies that use structured light to scan the wheel during spin. (Fig. 7) In addition, Force Matching locates the stiffest area of a tire and the lowest spot on a wheel to be marked and match-mounted to cancel radial-force vibration.


Fig. 6


Fig. 7


The new equipment package includes:

• Hunter Road Force Balancer Generation 5 (RFE13GM) • Printer • Overhead Laser / Light • Wheel Lift • Basic Hook-up (Excludes 240V and shop air installation) • Set-Up • Initial On-site Training • 3-Year Parts Warranty • 1-Year Labor Warranty (double the standard of 6 months)


GM has negotiated a special price for the Hunter Road Force Balancer Generation 5 that includes an extended warranty, standard installation, and training for dealership personnel. Dealerships that have a Generation 3 or Generation 4 Hunter Road Force Balancer but would like to upgrade to a Generation 5 model should contact GM Dealer Equipment at 1-844-742-8471 or visit


Tire Changers


Many dealerships currently have a tire changer that meets GM specifications. As a result, a tire changer is not part of the essential equipment shipment with the Hunter Road Force Balancer. However, GM has negotiated special pricing on several tire changer models that meet GM specifications for performing tire bead seating.


The Hunter Road Force Balancer allows dealerships to correct tire vibration concerns in a timely manner in addition to providing other tire services — all while ensuring that every tire/wheel assembly meets or exceeds GM specifications.


– Thanks to Chuck Berecz, Kent Woiak and Peter Joslyn


Updated March 3, 2017

What is Road Force? Diagnosing Tire Vibration with the Hunter Road Force Balancer

Many changes in the design of new vehicles highlight how important properly balanced and low Road Force tires are to ride quality. Advanced braking and stability systems, along with stricter fuel economy requirements, have led to the increased use of lower rolling resistance tires with a decreased contact patch. Suspension systems and tires also are getting stiffer. In addition, many modern tire/wheel assemblies can weigh as much as 80 lbs. as the customer demand grows for larger wheels in sizes of 20-inches and 22-inches. Using the Hunter Road Force Balancer (Fig. 8) will ensure that the tire/wheel assembly meets GM specifications prior to mounting the assembly back on the vehicle.


Fig. 8


In 2015, GM made the CH-51450-A Oscilloscope Diagnostic Kit (Pico Scope) an essential tool for all GM dealerships to help in diagnosing vibration conditions. The tool enables technicians to verify, measure and identify the type of vibration that a vehicle is producing. Once the area of the vibration is identified, the next step is to correct the issue. Any part that rotates can produce vibrations (such as tires, prop shafts, differentials, etc.), which makes diagnosis difficult. In some cases, the repair might require part replacement. But if the vibration is coming from the tire/wheel assemblies, the Hunter Road Force Balancer can help make the correct repair.


What Produces Road Force?


Previously, tire/wheel assemblies were measured for “static balance,” which allowed for weights to be placed on the inside and outside of the wheel flange/rim surface. While this is the first step in correcting a vibration condition, vehicles also need the Road Force checked. Road Force is a measurement of both sidewall stiffness and how much the assembly is “egg shaped.”


To understand the effects of radial force variation, imagine the tire as a collection of springs between the rim and the tire tread. If the “springs” are not of uniform stiffness, a varied force is exerted on the axle as the tire rotates and flexes. This force creates a vibration in the vehicle. (Fig. 9)


Fig. 9


The Hunter Road Force Balancer has the ability to measure this variation. By measuring, correcting and validating the tire/wheel assembly is within GM specifications for both static and Road Force, technicians can ensure that the tire/wheel assembly is corrected prior to mounting it back on the vehicle.


Excessive Road Force can be produced by incorrect tire mounting or improper bead seating to the rim. Both of these conditions will provide a low and/or high spot in that area of the tire. It can occur on either the inside or outside flange.


New Wheel Design


Many of today’s GM vehicles have a new flangeless wheel design (Fig. 10, #1) that has removed the machined flange (Fig. 10, #2) that previously allowed for the traditional “clip-on” weights. The flange was removed for esthetic reasons but has also driven the need for changes in balancers. Modern balancers need to account for this change by allowing wheels weights to be placed on the inside of the wheel.


Fig. 10


The previous method of “vectoring” or “Match Mounting” a tire cannot be used since the starting point is to measure the wheel runout using measurement arms. To address this concern, Hunter has developed the “180-Match Mount” process. (Fig. 11)


This process allows a more precise measurement and correction to the tire/wheel assembly by using the Road Force measurements to determine proper alignment of the tire to the wheel that produces the lowest Road Force.


Fig. 11


For more information on tire road force as well as additional tire and wheel diagnosis, refer to Bulletin #00-03-10-006M.


Detailed diagnostic steps for Tire and Wheel Vibration Analysis also can be found in the Service Information.


– Thanks to Chuck Berecz, Kent Woiak and Peter Joslyn



4WD Inoperative with no DTCs Set

If no power is transmitted to the front axle in 4WD on some 2015-2017 Silverado 4WD and Sierra 4WD models (RPOs NQF, NGQ), the transfer case front output shaft drive sprocket body ring may be separated. The transfer case must be in the 4WD mode with the 4WD indicator light on in the transfer case select knob (NQF) or on the instrument cluster (NQG).


Shift the transfer case to 4WD and ensure that the 4WD indicator is on, which shows that all operations to achieve 4WD were completed successfully. This means that the front axle actuator is locked in the 4WD position. If there is no transfer of power, a mechanical link may be broken in the transfer case or front axle assembly.


If the front propeller shaft can be rotated independently of the rear, the disconnect may be in the transfer case. Check that the body ring that the synchronizer engages has not separated from the transfer case front output shaft drive sprocket. (Fig. 12) The ring is a press fit and should not separate from the gear. If it is separated, replace the transfer case front output drive shaft sprocket as needed.


Fig. 12


If the front propeller shaft cannot be rotated independently of the rear, the disconnect may be in the front axle assembly.


– Thanks to Steve Schipansky

Vibration during 6th Gear Deceleration

The 2017 Camaro ZL1 with a manual transmission (RPO MJK) (Fig. 13) may have a vibration condition during deceleration in 6th gear. Drivers may feel the vibration in the floor, seat, console and steering wheel.


Fig. 13


The vibration is most noticeable at speeds from 70 to 60 mph (113 to 97 km/h. Using a Pico scope (CH-51450) will show a vibration at 46 Hz.


The vibration will only be present in 6th gear on deceleration with the clutch pedal not applied. If the clutch pedal is depressed and the condition is not present, the cause may be related to transmission main shaft. A repair is currently being developed. Do not attempt any repairs at this time.


If the clutch pedal is depressed and the vibration condition remains the same or is present in 5th gear during the same speed range, continue with diagnosis following the appropriate Service Information.


– Thanks to Steve Schipansky

Loose ECM-TCM Ground Connection

Some 2017 Colorado and Canyon models equipped with the 3.6L engine (RPO LGZ) may have an intermittent no crank condition. There may be a loss of communication with the Engine Control Module (ECM) and Transmission Control Module (TCM), the ignition key may be stuck in the ignition cylinder, and a dead battery.


The following DTCs also may be set: P018C, P0449, P0452, P0463, U0101, U0100, U0401, U0121, U0131, U18A2, P0522, P16E5, or P0118.


These conditions may be caused by a loose ECM-TCM ground (G104) (Fig. 14) on the driver’s-side cylinder head. Inspect G104 for a loose connection. (Fig. 15)


Fig. 14


Fig. 15


– Thanks to Aron Wilson

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