TECHLINEnews. High-Voltage Battery Pack Coolant Bleed Procedure. Quarterly Techline Infotainment DVD. How It Works. Contents

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1 June 2012 Volume 14, No. 6 High-Voltage Battery Pack Coolant Bleed Procedure There is a new high-voltage battery coolant bleed procedure for removing air trapped in the high-voltage battery coolant system of the Volt. The bleed procedure is required after completing the Volt Side Pole Impact Enhancement procedure and requires the use of the Vac-N-Fill equipment. This procedure also is required any time the high-voltage battery coolant loop is opened. Prior to performing the coolant bleed procedure, make sure your GDS 2 is up-to-date with the latest GM Global diagnostic package. The automatic coolant bleed procedure is found under the following GDS 2 path: Module Diagnostics > Hybrid Powertrain Control Module 2 > Control Functions > Hybrid/EV Battery Pack Coolant Pump Bleed Procedure. This procedure will take up to one hour to complete. The vehicle must remain in service mode during the procedure. Follow the on-screen instructions to complete the programming. continued on page 2 TECHLINEnews Quarterly Techline Infotainment DVD Coming in June, a new Techline Infotainment DVD will be released that is to be used in conjunction with TIS2Web Service Programming System (SPS) in the programming/configuration of next-generation radios such as MyLink, IntelliLink and CUE (RPOs UFU, UP9, IO5, IO6). The Techline Infotainment DVD will provide a fast, effective alternative to downloading large data files through the dealership Internet connection. The DVDs will be distributed on a quarterly basis; shipped to the attention of the service manager at each dealership. How It Works The Techline Infotainment DVD is used by the service department only for radio reprogramming. Do not insert the Techline Infotainment DVD into a vehicle s radio or navigation system. The Techline Infotainment DVD must be installed onto each Techline PC. When a radio reprogramming procedure requires files to be copied to a USB device, TIS2Web (SPS) will use files downloaded from the Techline Infotainment continued on page 2 Contents High-Voltage Battery Pack Coolant Bleed Procedure...1 Quarterly Techline Infotainment DVD...1 Understanding the Effects of Wheel Alignment...3 Difficulty Rotating the Key to the Lock Position...4 Four Odor from Vehicle Interior...4 Condensation in Tail Lights or Water in Trunk...4 HVAC Temperature Display...4 Tire Sidewall Irregularities...5 Emissions 2 Fuse Open...5 Corrosion Protection of Metal Panels...5 Memory Seats Lose the Stored Position...6 Multiple Communication Codes Water/Dust through Openings under the Bed Rails...6 Inoperative Instrument Panel Cluster...7 Turn Signals Flash Faster Than Normal...7 Automatic Climate Control Blows Cold Air before Engine Coolant is Warm...7 Car Issues Fix It Right the First Time...8 Truck Issues Fix It Right the First Time...8 Service Know-How...9 Customer Care and Aftersales

2 High-Voltage Battery Pack Coolant Bleed Procedure continued from page 1 The power electronics/ charging and battery cooling systems require a 50/50 mix of DEX- COOL and de-ionized water. Use the Vac-N-Fill to pull a vacuum of Update GDS 2 with the latest GM Global diagnostic package. at least 15 in. (381 mm) Hg on the battery cooling system side of the high-voltage battery coolant reservoir. This vacuum needs to be maintained while all of the air is purged from the system. During the procedure, the coolant level will drop below the reservoir. Do not break vacuum to fill the reservoir. Use the Vac-N-Fill equipment to fill the reservoir. This may have to be done several times during the procedure to prevent a low coolant condition that would allow air into the system. TIP: The coolant reservoir fill level for the high-voltage battery has changed. The coolant level should be up to the top of the seam in the reservoir. After the procedure, the coolant level should be at The power the top of the reservoir seam. electronics coolant reservoir fill level has not changed. Refer to SI document ID # and the Chevrolet Volt Customer Satisfaction Program seminar ( V) for more information on the bleeding procedure. Thanks to Keith Newbury and Ashmi Haria TECHLINEnews continued from page 1 DVD to a folder on the Techline PC. The programming process is similar to the current process, using a USB flash drive, following SPS instructions. TIP: This programming procedure requires use of a dedicated USB flash drive. SPS erases all content from the flash drive before downloading new files or software. Installing the DVD Before installing the Techline Infotainment DVD, confirm that the Techline Cache Notifier is installed. Look for the Techline Cache Notifier icon on the taskbar. Techline Cache Notifier icon If the Techline Cache Notifier icon is not present, it must be downloaded and installed from TIS2Web. Before installing the Techline Cache Notifier, close all other applications. 1. Insert the Techline Infotainment DVD into the DVD drive of the Techline PC. 2. Wait for the program to start. This may take several minutes. A GM Techline Cache pop-up window will be displayed. 3. Two main options to use the DVD will be presented Copy or Register. Select one. Copy is recommended. The content of the DVD will download to the Techline PC. Register can be chosen when there is not enough hard drive space to install files on the Techline PC. When Copy is selected, Register is not necessary. If you choose Copy, the content of the DVD will download to the Techline PC. Select a directory for the installation (Default is recommended). Click Select. A progress bar is displayed to track progress. When Copy Successful is displayed, click OK. If the Copy option is not successful, it may be due to insufficient computer hard drive space. If this condition is encountered, the Register option is recommended. If you choose Register, the program will run from the DVD drive of your Techline PC. Upon selecting Register, the DVD will register automatically. When Registered Successful is displayed, click OK. TIP: When Register is selected, the DVD must remain in the Techline PC. 4. When the DVD initialization process is complete, remove the DVD and store it in a safe place for future use. Now that the Techline infotainment DVD files have been either cached (installed) or registered (ready to run from DVD), TIS2Web SPS will prompt when files will need to be copied to a USB flash drive during a radio programming/configuration procedure. Techline Support For any questions or concerns with the installation of the Techline Infotainment DVD, contact the Techline Customer Support Center (TCSC) at (English) or (French). Replacement DVDs can be obtained from Archer by calling Thanks to Mike Waszczenko 2 June 2012

3 Understanding the Effects of Wheel Alignment All of GM s standard wheel alignment service procedures were recently updated in Bulletin # Be sure to refer to it for complete details on proper wheel alignment service. For a reference sheet that can help in diagnosing vehicle lead/pull or steering wheel angle conditions, click below. The reference sheet should be printed and kept near the alignment machine. Wheel Alignment Reference Sheet Along with the bulletin information, here are some additional tips and highlights. Vehicle Condition and Equipment Be sure there is nothing about the vehicle s condition or equipment that could contribute to a mis-alignment condition. Things to consider include: Wheels and Tires Verify that wheels and tires are original equipment or Official GM Accessories. Suspension Verify that the vehicle suspension has not been altered, including the addition of an aftermarket suspension lift or lowering kit. Vehicle Damage Check for evidence of accidental damage that could affect alignment. TIP: While major damage can be obvious, subtle items like scuffed wheels or tire sidewalls may indicate curb damage that can affect alignment. Vehicle Use Check that the vehicle has seen normal use rather than abuse. The condition of the tires and the vehicle in general may indicate very aggressive driving. Added Equipment Check for equipment that may significantly affect vehicle mass. TIP: Significant additional mass can affect the trim height and wheel alignment of the vehicle. This may require a customer-paid wheel alignment if the items are placed in the vehicle semipermanently. Upfitters are instructed to realign the vehicle after installation of these types of items. Understanding the Customer Concern Repair Order It is important to include as much information as possible in the RO, including the confirmed customer concern and the complete before and after alignment measurements on the vehicle. Steering Wheel Angle On the RO, always note which direction the steering wheel is clocked (left/counterclockwise or right/clockwise) TIP: When dealing with a verified steering wheel angle condition, remember that front and rear toe are the only alignment values that affect the angle of the steering wheel. Vehicle Pull Drive the vehicle to verify that the vehicle does have a pull condition and not a steering wheel angle issue. A vehicle with a valid pull condition will pull to one side or the other regardless of steering wheel angle. Causes of Vehicle Pull A vehicle pull condition may be caused by tires or alignment settings. Tires If a pull condition has been verified but the alignment settings all are within specifications, the issue may be in the tires. Certain tire differences left to right may cause a vehicle pull. Temporarily swapping the front tires left to right and re-evaluating is a simple way to verify a tire issue. Always note if tires are directional and not able to be permanently swapped side-to-side. TIP: Always ensure tire pressures are set to correct specifications before and after evaluating a vehicle. Alignment Settings Front or rear toe values being out of specifications do not cause an otherwise true vehicle pull. If only front or rear toe values are out of specification on a vehicle with a confirmed pull issue, something else is causing the pull. REQUIRED: Prior to any measurement on the alignment machine, confirm the current specifications and tolerances in the appropriate Service Information. Do not assume the numbers in the alignment machine are correct and up-to-date. If Cross Camber and Cross Caster are within GM specifications listed in the appropriate Service Information, it generally means that they are not the reason for a vehicle pull concern. Front Cross Camber (LH minus RH) Front Cross Caste (LH minus RH) Front and Rear Toe Positive Value Pulls Left Pulls Right Does not cause vehicle pulls Negative Value Pulls Right Pulls Left Does not cause vehicle pulls It is possible for customers to confuse a steering wheel off angle condition as a vehicle pull condition, as they may be trying to hold the wheel centered (level) on a straight road, which would be adding a slight steering input to the wheels. If this is the case, note it on the Repair Order, including the direction the vehicle is pulling. The Effects of Road Conditions Road Slope High road slope angles can cause a vehicle to drift one way or the other. Use a road that is as flat as possible for evaluations. Effects of road slope Trough Wander/Tramlining Troughs or grooves in the road can pull a vehicle to one side or the other, depending on where the tire is located in the groove. The tires will always want to pull the vehicle up the wall of the trough. Adjusting alignment settings will not improve a trough wander condition or the sensitivity of the vehicle to trough wander. Effects of trough wander Click here for the printable reference sheet on the effects of wheel alignment. Thanks to David MacGillis and Steve Lee June

4 Difficulty Rotating the Key to the Lock Position On a LaCrosse (not equipped with Keyless Start, RPO BTM), it may be difficult to turn the key to the Lock/Off position if the key is rotated slowly. If the key is rotated from the Run/On position to the Lock position quickly, the condition is not noticed. TIP: Other electrical functions on the vehicle also may be inoperative when the key is in the accessory position, such as the radio, power windows, etc. Voltage dropping out on circuit 143 when the key is in the Accessory position may cause this Location of fuse F24DA condition. Verify that the F24DA fuse is not open. This fuse is located in the X51A instrument panel fuse block position 22. Thanks to Chris Hightower Foul Odor from Vehicle Interior There may be a foul odor in the interior of some 2012 Silverado and Sierra Extended Cab models. This condition affects ONLY the extended cab models built at Fort Wayne Assembly (RPO FWI) between 1/27/12 and 3/15/12. This odor may be coming from the rear door leading edge seal. To confirm the odor is coming from the seals, remove both rear door seals and Rear door leading edge seal place them inside a plastic trash bag. Keep them sealed in the bag for several hours and then open the bag and confirm the odor. If the odor is still present, replace the door seals. Thanks to Jim Will Condensation in Tail Lights or Water in Trunk The trunk lining may be wet or there may be water in the spare tire well, or there may be condensation in the tail lights, on some 2013 Malibus. These conditions may be caused by a mispositioned pressure relief valve or trunk lid liner, an open area in the trunk seam sealer, or a leaking wire harness retainer. Check that both pressure relief valves are properly installed in their openings. They should be snapped in from the outside. Check the seam all around the trunk opening and/or tail lamp pocket for skips in the sealer. Reposition the pressure relief valve or repair the seam sealer as needed. In addition, check that the felt deck lid liner is not oversized and laying on the trunk opening seal when the trunk lid is closed. Also check all wire harness retaining clips for signs of water intrusion. Clear any tail light condensation by running the vehicle with the parking lamps on. Thanks to Christopher Crumb Condensation in the tail lights Check that the deck lid liner is not interfering with the trunk opening seal. HVAC Temperature Display On a 2012 Verano or 2013 Malibu, the driver and passenger temperatures settings may be displayed in Celsius or the outside ambient temperature may be missing from the radio/hvac display. The outside ambient temperature sensor is disconnected or the wiring has a fault. Connect the vehicle to the GDS 2 scan tool and check the instrument panel cluster for DTC B0158 (Outside Air Temperature Display Malfunction). Also check the connection at the outside ambient temperature sensor. If no conditions are found, check the integrity of circuits 61 and 636 from the sensor to the instrument panel cluster. Thanks to Christopher Crumb 4 June 2012

5 Tire Sidewall Irregularities Slight sidewall indentations are a common characteristic of radial tire construction. These indentations are more noticeable on larger size tires having a larger side wall height, including the following models: Escalade, Escalade ESV, Escalade EXT, Avalanche, Silverado, Suburban, Tahoe, Sierra, Yukon, Yukon Denali, Yukon XL, and Yukon Denali XL. Radial tire body construction includes individual cords that run parallel to each other from bead to bead (down the sidewall, across the tread and up the other sidewall). These cords will overlap at points on the circumference of the tire. When the tire is mounted and inflated, it is free to naturally expand. The overlapped areas may create slight indentations, undulations, or protrusions since the stretching capacity of the overlapped area is slightly different than the rest of tire sidewall area. These irregularities are a visual condition that will Examples of tires with a sidewall indentation not affect durability, reliability or performance of the tires. Tire replacement to address this condition is not recommended; the replacement tires will likely have the same or similar condition. TIP: Indentations are not to be confused with sidewall bulges. An outward sidewall bulge indicates spread or broken cords. Tires with a (outward) sidewall bulge should be replaced. Thanks to Scott Fibranz Emissions 2 Fuse Open If the Service Engine Soon light is On and an Emissions 2 (EMIS 2) fuse is open on 2012 Impala models built prior to February 15, 2012, check the metal wiring harness clip located just above the alternator. A number of DTCs (P2199, P11C2, P0693, P0691, P0178, P0161, P0141, P0102, P0097, P0056, P0036, P2228, P1258 and P0113) also will be set. Inspect the metal wiring harness clip located above the alternator. Once the metal clip is opened, damage to the conduit may be evident. It may be necessary to open the conduit to inspect the circuits. Repair the wiring and conduit. Modify the clip so it holds the harness in place but will not pierce the harness. It may be necessary to remove all traces of the tab that pierces the harness in order to prevent future damage. Thanks to David Eplin Damaged wiring harness Corrosion Protection of Metal Panels When a GM-approved or aftermarket accessory is installed on a vehicle, where drilling holes into metal body panels or supports on the vehicle is required, it s critical to maintain proper corrosion protection. Any time a metal surface is disturbed, such as by drilling a hole for a fastener, the corrosion resistance of that panel is compromised. GM has determined that the best way to protect the fastener-to-panel mounting holes from future corrosion is to use GM Vehicle Care Super Lube with PTFE (Polytetrafluoroethylene). This is the only product recommended by GM and is required by GM for the corrosion protection of metal panels where fasteners will be added to metal panels. When installing accessories, apply Super Lube to any hole and fastener before installing the fastener into the drilled attaching hole or inside the metal panel. Refer to Bulletin # for more information. Thanks to Keith Borowy Use GM Super Lube to help ensure metal panel corrosion protection. June

6 Memory Seats Lose the Stored Position On some LaCrosse (with memory seat, RPO A45), SRX (with memory driver convenience package, RPO AAB), Equinox LTZ, and Terrain SLT models, the memory seat may not return to the stored position when recalling it from the exit position, or it may lose the memory settings. TIP: Generally, the condition is noticed after multiple operations, making the condition perceived as intermittent. First, verify the Memory Recall feature is being used correctly. Refer to the current version of #PIT4913 (Memory Seat Recall Inoperative from Key Fob) before proceeding with the following steps. Unlock the vehicle with the key fob button and turn the ignition to the Run position. Move the seat to the preferred customer driving position. Visually determine the seat location by using a focal reference point or measurement tool. Turn the ignition to Off to save the current seat position as the memory position for the current key fob. If the driver s door is already open, the seat will move to the Easy Exit position. If the driver s door is closed, open it to activate the Easy Exit feature. While leaving the driver s door open, cycle the seat between the key fob memory position by pressing the unlock button on the key fob and the Easy Exit position by turning the ignition to Run and then to Off. Perform this test up to 10 times. End at the same stored seat driving position. If the seat position appears to have moved forward or rearward in the vehicle (in some cases up to 1/2 inch), new software is available for the Memory Seat Module (MSM). TIP: For the Equinox LTZ and Terrain SLE models only, in TIS2Web, after selecting MSM from the Module List, the Vehicle Options drop-down list will come up. Select Heated Seats (+KA1). For all other models, select the appropriate options listed using the RPO list. Under the Calibrations Tab, use the current TIS2Web Calibration identified as New software to address customer complaints related to drifting memory position or loses memory position. Thanks to Ernest Haller Multiple Communication Codes If a 2012 Sonic exhibits a no crank or no start condition and multiple communication DTCs are set in history or communication with certain modules is not possible, inspect the following areas: 1. Inspect for a loose ground connection at G104 and improperly crimped wires. The G104 location is incorrect in the Service G104 location Information for US/ Canada Sonic but is correct in the Service Information for Global Sonic. A correction is being made. 2. Check G105 under the battery tray for weld slag or paint on the grounding surface of the stud or nut. Remove the battery tray to inspect the grounds. G105 is directly under the battery tray, left of the Underhood Bussed G105 location Electrical Center (UBEC) on the frame rail. 3. Check power feed circuit 5290 from the UBEC to the ignition coil. In some cases, an internal open in the UBEC may be found. Thanks to Bryan Brunner Water/Dust through Openings under the Bed Rails Silverado or Sierra pickups may have water or dust appearing from the openings under the bed rails near the stake pockets. While the openings on the new Silverado and Sierra are more visible, the Classic Silverado and Sierra had similar openings around the stake pockets. The new design has equivalent performance for dust and moisture intrusion as compared with the previous design. The pickup box is not designed to be sealed completely from dust or moisture intrusion. Because the openings are design intent and are required for the unique forming process of the new pickup box side inner stamping, no warranty repairs should be made. However, these holes may be covered with many different types of materials. Several different companies, for example, ACI Agri-Cover, Inc. ( agricover.com/product/totalbedseal), offer accessories for customer purchase, which helps keep rain, snow, and dust out of the truck bed. Thanks to Jim Will Location of opening near stake pocket 6 June 2012

7 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: Diana Sancya GM Customer Care and Aftersales Editor: Lisa G. Scott GM Customer Care and Aftersales Technical Editor: Mark Spencer Production Manager: Marie Meredith Desktop Publishing: 5by5 Design LLC 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 2012 General Motors All rights reserved. Inoperative Instrument Panel Cluster On some 2012 Sonics, the instrument panel cluster may be intermittently inoperative with only the Check Engine light illuminated or the cluster backlighting may flash on/off intermittently. DTC U0155 (Lost Communication with Instrument Cluster) may be set. If these conditions are found, check fuse F26DA in the instrument panel fuse block for a spread terminal and a damaged fuse. Upon inspection, if the terminal is spread, use a suitable tool to close the gap in terminal and then replace the fuse. Thanks to Bryan Brunner Turn Signals Flash Faster Than Normal The turn signals may flash faster than normal on some 2012 Acadia models. The condition may not be able to be duplicated and may affect the left or right turn signals. The Body Control Module (BCM) monitors the current draw from the turn signals. If the current draw is out of range, it will cause the turn signals to flash faster than normal. The current draw can be out of range if there is an issue with the bulbs or with the circuit board in the rear lamp assembly. Inspect the turn signal operation. If the turn signals flash faster than normal, Fuse F26DA inspect the front turn signals for burned out bulbs. Replace any burned out bulb(s). Inspect the rear lamp operation. If they do not illuminate, test the circuit for an open. If the lamps do illuminate but are flashing fast, replace the rear lamp assembly. If the condition cannot be duplicated, apply and hold the brakes for at least five minutes. Inspect the turn signal operation once again. If the turn signals flash faster than normal, replace the rear lamp assembly. Thanks to James Miller Automatic Climate Control Blows Cold Air before Engine Coolant is Warm On some Silverado and Sierra models equipped with the 6.6L diesel engine (RPO LMM) and automatic climate control (RPO CJ2), the Auto HVAC blower will blow cold air at high speed before the engine coolant temperature is warm in cold weather. The HVAC blower will be ramped up to approximately 90% within one or two minutes after the engine is running. This condition only occurs if the blower is set to the Auto mode. The blower speed can still be adjusted to any speed by using the manual fan speed control. TIP: During normal Auto HVAC blower operation, the blower will start to blow at a low speed when the engine coolant temperature reaches 40 F (4 C). As the engine coolant temperature increases, the blower speed also will increase. Once the engine temperature is at 136 F (58 C), the blower could be commanded to high speed. Do not replace any parts for this condition. Reprogram the HVAC Control Head with the latest calibration available in TIS2Web. Thanks to James Will June

8 Car Issues Fix It Right the First Time Model Year(s) Vehicle Line(s)/Condition Do This Don t Do This Reference Information/Bulletin All Lines Corrosion protection for metal panels with dealer-installed accessories fastened by drilled holes Apply corrosion protection to drilled holes with exposed metal Not apply corrosion protection to drilled holes with exposed metal F CTS Coupe, CTS-V Coupe, CTS Coupe Memory seat/mirrors switch buttons intermittently stick Obtain memory switch bezel from WPC when needed for sticking switch Replace entire door trim panel PI0468A 2012 Impala Rattle noise from front of vehicle on bumpy roads Verify the hood latch and bumpers are not source of noise Replace suspension components PI Impala MIL On, various DTCs set, including C0035, P0641 and/or P06A3; IPC inoperative, display fuse blown Inspect for harness routing and potential short to ground Overlook harness routing PI0631B Cruze, Sonic Engine rattle/knock noise, loose or broken front crankshaft pulley bolt and/or flywheel bolts Check over speed data with GDS to help determine reason for failure Assume it is a product or material defect without checking for likely cause PI Cruze, Sonic Coolant leak at thermostat housing to cylinder head Replace only the seals Replace the thermostat housing or the thermostat for a rolled seal PI All Vehicles Information on inadvertent Steering Wheel Control button press causing radio anomalies Ensure it was not caused by an inadvertent press of the steering wheel controls Replace the radio A Equinox, LaCrosse, Malibu, Regal, Terrain, Verano, Volt Intermittent Pandora operation Ensure that Pandora is not being disabled by a task manager or timer Replace the radio PI Equinox, LaCrosse, Malibu, Regal, Terrain, Verano, Volt Multiple song listings when using USB input Restore factory defaults or perform the USB update as directed Replace the radio PI Camaro, CTS, CTS-V, CTS Coupe, CTS-V Coupe, CTS Sport Wagon, CTS-V Sport Wagon, Equinox, Sonic, Terrain MIL illuminated, DTC P0442 or P0455 set Smoke test system for leaks. If no leaks, replace evaporative emission canister vent solenoid valve Replace the fuel tank evaporative emission canister or lines PI0697A 2012 Camaro Glovebox door not latching properly, loose on left side Replace the glove box door bumpers Replace the glove box door. It is not bent or warped PI Cruze HVAC blowing cold air when set to auto ac mode and set to warm temperature Reprogram HVAC control module Replace HVAC control module or any other HVAC components PI Cruze Supplemental repair required for HVAC condenser inoperative/replacement due to stone/ foreign material impact Install condenser screen when replacing condenser Install new condenser without screen PI0461B 8 June 2012

9 Truck Issues Fix It Right the First Time Model Year(s) Vehicle Line(s)/Condition Do This Don t Do This Reference Information/Bulletin Terrain, Equinox Windshield defroster operation Check for new HVAC system control module service calibration reprogramming Replace the HVAC control module PI0701A 2012 Sierra, Silverado, Canyon, Colorado, Express Savana MIL - Check Engine light On, DTC P0741 is set Replace the transmission internal wiring harness Replace the torque converter PIP5009C 2012 Silverado, Sierra, Extended Cab Only Foul odor from interior of vehicle Verify whether odor is originating from seals using procedure as outlined Fail to verify source of odor using specified procedure PIT Silverado, Sierra General water leak diagnostic guide Verify source of water leak and perform repairs following steps as outlined Fail to follow outlined process C 2012 Sierra, Silverado Trailer hitch pins too short or do not fit Verify the hitch pin can be installed during PDI or prior to customer delivery of the truck Fail to verify the hitch pin can be installed PI Avalanche, Escalade, Escalade ESV, Escalade EXT, Sierra, Silverado, Suburban, Tahoe, Yukon, Yukon Denali, Yukon XL, Yukon XL Denali Poor voice quality during Bluetooth Call or OnStar personal call Reprogram the VCIM with updated software calibration Replace the VCIM or perform ONSU programming PI0688B Escalade, Escalade ESV, Suburban, Tahoe, Yukon, Yukon Denali, Yukon XL, Yukon XL Denali Third row seat(s) difficult to remove, install, release, tumble, fold, squeak noise Verify seat operation following steps as described, follow repairs outlined to correct concerns Fail to verify seat operation following steps prior to repair A D Emerging Issues June 14, 2012 Service Know-How To view Emerging Issues seminars: Log in to select Service Know-How/ TECHAssist from the menu, select Emerging Issues, and then Searchable Streaming Video to choose the current Emerging Issues seminar or past programs. Customer Care and Aftersales June