Advanced Diagnostics

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Lewis Burke
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performance issues and notifies owners through OnStar to help avoid potential vehicle conditions. It replaces the previous Vehicle Health Management (VHM) service.

1 Mid-July 2015, Volume 17, No. 14 Advanced Diagnostics Proactive Alert Expands for 2016, Adds New Models The new Advanced Diagnostics Proactive Alert service monitors the engine cranking and fuel delivery systems for certain performance issues and notifies owners through OnStar to help avoid potential vehicle conditions. It replaces the previous Vehicle Health Management (VHM) service. In addition to the new name, the service has been expanded for 2016 and is available on the following models that are also enrolled in OnStar Vehicle Diagnostics: 2016 Corvette equipped with RPO LT1 or LT Silverado LD, Sierra LD equipped with RPO LV3, L83, L86 or L8B 2016 Escalade, Escalade ESV equipped with RPO L Suburban, Tahoe, Yukon, Yukon XL equipped with RPO L Equinox and Terrain equipped with RPO LFX The Proactive Alert service is designed as a preventive measure. Owners must enroll in OnStar Vehicle Diagnostics and the Proactive Alert service. The vehicle systems monitored by the Proactive Alert service include battery and starter performance in the engine cranking system and fuel tank fuel pump module and fuel pressure sensor performance in the fuel delivery system. Communication Process for 2016 Models If an issue is identified on a 2016 model, a Proactive Alert service message is generated and will be played through the vehicle s audio system shortly after the vehicle is started. In addition, a text message and will be sent to the customer using the phone number and address provided when enrolling in the service through OnStar. Beginning later this year, an also will be sent to the Customer Experience Manager at the preferred service provider (GM dealership) that the customer selected when enrolling in the service. continued on page 2 CONTENTS Advanced Diagnostics Proactive Alert New Calibrations for the ECM and TCM... 2 Power Steering Conditions and Service Power Steering Message The Next Generation of GlobalConnect... 3 Battery Saver Message or Low Battery Indicator Displayed Wet Front Floor Carpet Lack of Power in High Ambient Temperatures... 5 Engine Harness Routing Conditions... 5 Customer Care and Aftersales

2 Advanced Diagnostics continued from page 1 If a service message is unclear when the vehicle arrives at the dealership, press the blue OnStar button in the vehicle to contact an OnStar advisor. All Proactive Alert service messages on 2016 models sent to the customer are available through OnStar. Communication Process for 2015 Models If an issue is identified on a 2015 model, a Proactive Alert service message is generated and sent via OnStar to the Customer Assistance Center (Customer Care Centre in Canada), which will contact the customer and help schedule a service appointment with the preferred service provider. An also is sent to both the customer and the preferred service provider. If a service message is unclear once the vehicle arrives at the dealership, contact the Dealer Business Center Aftersales (or Customer Care Centre in Canada) in order to proceed in the appropriate diagnostic direction. TIP: Since the system is monitoring for potential conditions, some Proactive Alert service messages may be generated without any apparent symptoms being noticed by the driver. Service Message Identifiers Currently, there are nine different Service Message Identifiers. These are not Diagnostic Trouble Codes (DTC). The identifiers combine the related Service Information section with a number, which can be used in a Service Information keyword search. For example, 12 volt battery is covered under the Starting and Charging section, so the first battery Service Message Identifier is SAC001. The Proactive Alert service messages are not stored in the vehicle and cannot be retrieved using a scan tool as would a DTC. Related on-board DTCs may or may not be set. To begin vehicle diagnosis and repairs, review the Service Message Identifier in the message provided by the owner, the Customer Assistance Center (or Customer Care Centre) for 2015 models, or OnStar for 2016 models. Following are the Service Message Identifiers. Refer to #PI1250B for complete diagnostic procedures for each identifier. All parts replaced under this program are requested back by the Warranty Parts Center. SAC001 SAC002 SAC003 SAC004 SAC005 ECF001 ECF002 ECF003 ECF004 Service Message Identifiers Once the proper repairs have been made, the Proactive Alert service will clear the service message after the vehicle is operated over a number of ignition cycles. If other on-board DTCs have set, clear them prior to releasing the vehicle to the owner. Due to the unique nature of the Proactive Alert service, special Bulletin Only Labor Operations have been set up for repairs of identified service messages. These Bulletin Only Labor Operations must be used for any repairs related to a service message. For additional information about the Advanced Diagnostics Proactive Alert service, including the special Labor Operations, refer to #PI1250B. Thanks to Len Tillard Predicted Starting and Charging Battery Low Cranking Capability Due to Shorted Cell Predicted Starting and Charging Low Cranking Capability Due to High Resistance Predicted Starting and Charging Battery Low Cranking Capability Due to Low State of Charge Predicted Starting and Charging Low Cranking Capability Due to High Resistance in Starter System Predicted Starting and Charging System Performance Low Cranking Capability Due to High Resistance in Battery or Short in Starter Predicted Fuel Pump System Fuel Tank Pump Module Predicted Fuel Pump System Fuel Tank Fuel Pump System High Resistance Predicted Fuel Pump System Fuel Tank Fuel Pump and Pressure Sensor System Performance Predicted Fuel Pressure Sensor Fuel Pressure Sensor (Feed Pipe or Fuel Feed Pipe) System Performance New Calibrations for the ECM and TCM If a 2015 Colorado or Canyon equipped with the 3.6L V6 engine (RPO LFX) exhibits any of the following engine or transmission conditions, complete the following procedure before replacing any parts or performing other repairs. Engine/Transmission Conditions: Flashing or solid malfunction indicator lamp (MIL) with a misfire Rough idle Lack of engine performance Tip in bump Stall at idle after climbing and descending a mountain grade Low-speed chuggle Cruise engagement bump with too much feel Shift busyness Illuminated MIL with DTC P0326 (Knock Sensor Performance Bank 1) or P0331 (Knock Sensor Performance Bank 2) Detonation, spark knock or an abnormal ticking noise If any of these conditions are present, reprogram the ECM and TCM with the latest available calibrations in TIS2WEB. Reprogram both modules at the same time. Thanks to Aron Wilson Power Steering Conditions and Service Power Steering Message Some 2015 Colorado and Canyon models may have a loss of power steering assist, a hard-tosteer condition or display a Service Power Steering message on the Driver Information Center. These conditions may be intermittent. Check the Power Steering Control Module (PSCM) for DTCs. If DTC C056D (Electronic Control Unit Hardware) is set, reprogram the PSCM with the latest calibrations available in TIS2WEB. If DTC C0545 (Steering Wheel Torque Sensor) is set, contact the GM Technical Assistance Center for additional information. Thanks to Ken Cole 2 Mid-July 2015

The Next Generation of GlobalConnect When you log in to GlobalConnect for access to the Service Information, TIS2Web and many other Techline applications, you re now presented with the next

The navigation and functionality of the updated site has been updated to deliver more information in an easy-to-use format. Here s a look at some of the features of the new GlobalConnect.

Click the App Center tab at the top of the home page to view the apps in the following categories: Order, Sales, Service, Parts, Business Office, Fleet & Commerical, and Marketplace.

3 The Next Generation of GlobalConnect When you log in to GlobalConnect for access to the Service Information, TIS2Web and many other Techline applications, you re now presented with the next generation of GlobalConnect that not only looks different but also has a number of new features. The navigation and functionality of the updated site has been updated to deliver more information in an easy-to-use format. Here s a look at some of the features of the new GlobalConnect. App Center Applications, information and programs are provided as apps on the new GlobalConnect. Click the App Center tab at the top of the home page to view the apps in the following categories: Order, Sales, Service, Parts, Business Office, Fleet & Commerical, and Marketplace. Departments Click the Departments tab and then select a department to go the main page of that department, such as Service or Parts. The main page includes headlines, applications, a reference library and quick links to other programs. Center of Learning The Center of Learning tab provides a direct link to the Center of Learning so a separate login is not needed. Support Click the Support tab for additional information on several categories: Applications, Center of Learning, Certified Pre-Owned, Forms, Pre-Sales and Service. The Service category includes FAQs on GlobalWarranty, labor time guide, special policy reimbursement and much more. My Shortcuts The My Shortcuts tab lists all the shortcuts to your apps that you have created. Creating a shortcut is a convenient and easy way to access the features you use every day. Technicians should consider adding the following shortcuts found under the Service category: Investigate Vehicle History Calibration ID Technician Forum Service Information (SI) Created shortcuts are listed under the My Shortcuts tab. Pre-Delivery Inspection Forms Vehicle Identification Number (VIN) Information TIS2WEB Service Forms TechLink Connecting to the new GlobalConnect Here are several tips to use when first logging in to the new GlobalConnect. Internet Explorer If you use Internet Explorer and are having problems logging in the new portal, you may need to update your Internet Explorer browser Trusted Sites. In an Internet Explorer browser window: 1. Click the Settings icon in the top-right corner 2. Select Internet options, followed by Security and Trusted sites. 3. Click the Sites button and add 4. Click Add and then Close. 5. Reopen the browser to launch GlobalConnect. Validation Receipt Timing providers do not always provide immediate messages. Some mailboxes may take up to 20 minutes for a message to appear in the Inbox. Please be patient with the timing of receiving your from GlobalConnect. Also check your spam or junk folder. If the validation is in the junk folder, move it to the Inbox before clicking on the validation link. Creating Shortcuts Shortcuts are not migrated from the old portal, so they need to be set up again in the new GlobalConnect. A shortcut can be created that links to any content or App, including TechLink. To create a shortcut in the App Center: 1. Within the App Center, all apps are listed by department. Use the Search of Apps Filter to locate an app. 2. Click the app icon to display the app details. 3. Click the Add to My Shortcuts button to create the shortcut. 4. The shortcut is now available on the My ShortCuts page. To view, click the My Shortcuts tab. Thanks to Lisa Scott Select an app. Click the Add to My Shortcuts button. Mid-July

Battery Saver Message or Low Battery Indicator Displayed Wet Front Floor Carpet Some 2015 Silverado 1500 and Sierra 1500 pickups built after March 1, 2015, may have a water leak that leaves the left

There may or may not be any low voltage DTCs or DTC P0AF8 (Hybrid System Voltage) set in history and the Check Engine Lamp or Service Vehicle Soon indicator may or may not be displayed.

The Battery Saver message will illuminate at voltages of 11 12 volts without displaying the red battery indicator. The red battery indicator will illuminate at voltages below approximately 11 volts.

Use a scan tool to select the 14V Power Module Control Function in the ECM and Accessory Power Module Setpoint in the BCM to check that the system is able to respond to current loads.

Allow a drive cycle afterwards before maximum Accessory DC Power Converter Module (APM) output to occur and for the Battery Saver message to be removed.

4 Battery Saver Message or Low Battery Indicator Displayed Wet Front Floor Carpet Some 2015 Silverado 1500 and Sierra 1500 pickups built after March 1, 2015, may have a water leak that leaves the left or right front floor carpet wet. A Battery Saver message or red battery indicator may be displayed in the Driver Information Center on some Spark EV, ELR; and Volt models. There may or may not be any low voltage DTCs or DTC P0AF8 (Hybrid System Voltage) set in history and the Check Engine Lamp or Service Vehicle Soon indicator may or may not be displayed. If any of these conditions are present, check to see whether the 12V battery may have been severely discharged. Use the GR8 Battery Tester to test its condition. The Battery Saver message will illuminate at voltages of volts without displaying the red battery indicator. The red battery indicator will illuminate at voltages below approximately 11 volts. Also perform the DC Power Conversion Test published in the appropriate Service Information to check for maximum current and voltage output. This test requires the use of a carbon pile load tester. Use a scan tool to select the 14V Power Module Control Function in the ECM and Accessory Power Module Setpoint in the BCM to check that the system is able to respond to current loads. If the 12V battery was discharged, charge it to remove the Battery Saver message. Allow a drive cycle afterwards before maximum Accessory DC Power Converter Module (APM) output to occur and for the Battery Saver message to be removed. If the test fails or if there are low voltage DTCs or DTC P0AF8 set, confirm that the 200 amp fuse located in the X50D fuse block is torqued to the correct specification. Voltage should be checked on both sides of the 200 amp fuse with a digital multi-meter while there is a load applied. Voltage drop can be checked from the positive battery post to the APM side of the 200 amp fuse as well. If the APM will output current under a load but the voltage is low on both sides of the fuse when compared to the voltage output at the APM, check the following: Follow the appropriate Service Information for any other DTCs The APM output terminal is clean and torqued to specification The APM output cable ring terminal is properly seated to the APM output terminal post Test the voltage drop on the ground cables to the engine block, transmission, body and chassis to ensure that they are within specification Thanks to Brian Ciaverella Seam at the front kick panel (right side shown) Vertical cowl seam Pull back the carpet on affected side (left or right) at the kick panel and perform a water test. If the leak is found to be coming from the seam (Fig. # 1) at the front kick panel (right side shown; left side is similar), it will be necessary to remove the front fender to gain access to the vertical cowl seam (Fig. # 2) that is leaking. Apply seam sealer to the cowl seam. To repair, apply clear, flowable seam sealer to the cowl seam (Fig. # 3) and into the pocket (Fig. # 4 & # 5) as shown (right side shown; left side is similar). Thanks to Scott Fibranz Apply seam sealer into the pocket (right side shown). Seam sealer in the pocket (right side shown) 4 Mid-July 2015

Lack of Power in High Ambient Temperatures Some 2010-2013 Avalanche, Silverado, Sierra; and 2010-2014 Suburban, Tahoe and Yukon models equipped with the 5.

5 Lack of Power in High Ambient Temperatures Some Avalanche, Silverado, Sierra; and Suburban, Tahoe and Yukon models equipped with the 5.3L cast iron block engine (RPO LMG) may experience a lack of power on initial acceleration from a stop when the ambient temperature is approximately 103 F (39 C) or greater. There also may be engine detonation or pre-ignition type events as temperatures approach 120 F. No DTCs will be set. The vehicle is being operated using low octane fuel. In addition, this condition is most likely to occur on vehicles with a 3.08 axle ratio. If this condition is found, perform all appropriate Service Information (SI) diagnostics, document all test results, and repair as necessary. If SI diagnosis does not isolate the cause of the condition, take a Tech 2 snapshot of the condition happening and note the Spark Parameter in the Ignition Data List. If it drops near/below 0 degrees during the condition, check to see whether there is a cylinder that shows any knock. If knock occurs, perform a top engine clean. If the condition is still present, recommend that premium fuel (91 octane or higher) with detergents (TOP TIER Fuel) be used when ambient temperatures exceed 110 F. This should provide a slight improvement in engine performance when ambient temperatures are especially high. For a list of gasolines that have met the TOP TIER detergent standards, refer to Bulletin # M or go to Thanks to Richard Renshaw Engine Harness Routing Conditions One or more of the following conditions may be present on a Equinox or Terrain equipped with the 3.6L V6 engine (RPO LFX): Intermittent starter-type chatter noise Longer than usual engine crank cycle Intermittent illuminated Service Engine Soon lamp Intermittent illuminated low oil pressure lamp on Check the routing of the engine harness. One or more of the following DTCs also may be set: P0261, P0264, P0267, P0270, P0273, P0276, or P0641. If any of these conditions are found, inspect the engine wire harness routing. The engine harness may be to too close to the rear of bank #2 valve cover (left cylinder head) and fastener bolt heads. Inspect the wrapped portion of the harness between the ECM and the upper rear of the engine for a rubbing condition causing a circuit short. Repair the wiring and harness protective wrap and reposition the harness away from the engine. Thanks to Jim Miller GM TechLink is published for all GM retail technicians and service consultants to provide timely information to help increase knowledge about GM products and improve the performance of the service department. Publisher: John Meade GM Customer Care and Aftersales Editor: Lisa G. Scott GM Customer Care and Aftersales Technical Editor: Mark Spencer /mspencer@gpstrategies.com Production Manager: Marie Meredith Graphic Design: 5by5 Design LLC /dkelly@5by5dzign.com Fax number: Write to: * TechLink PO Box 500 Troy, MI GM TechLink on the Web: : GM GlobalConnect General Motors service tips are intended for use by professional technicians, not a do-it-yourselfer. T hey are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the information applies to your vehicle or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information. Inclusion in this publication is not necessarily an endorsement of the individual or the company. Copyright 2015 General Motors All rights reserved. Mid-July

Instructional Videos and Active Website Links Now Included in GM Service Information

January 2018, Volume 20, No. 1 Instructional Videos and Active Website Links Now Included in GM Service Information As the saying goes, pictures are worth a thousand words, but videos are also pretty helpful