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March 2014, Volume 16, No. 3

ELR Smart Wiper System The 2014 Cadillac ELR features a smart wiper system that includes left and right wiper motor modules instead of the usual single motor and linkage. This is the first GM vehicle with independent wiper motors. The wiper motor modules are supplied 12 volts B+ at all times through separate fuses in the underhood fuse block. The wiper switch is an input to the Body Control Module (BCM), which commands the wiper motor modules via Local Interconnect Network (LIN) serial data communications instead of wiper motor relay drive outputs. It communicates directly with the left motor module, and that data is passed on to the right module. Unlike previous wiper systems, each wiper arm operates independently from the other. With the ignition off, either arm can be moved to any position on the glass. The left wiper arm also can be raised off the glass and it will hold that position. The right arm can be raised, but will not stay up.

ELR Smart Wiper System. . . . . . . . . . . . . . . . . . . . . . 1 New Door Latch Design . . . . . . . . . . . . . . . . . . . . . . . 3 Brake Noise on Initial Brake Apply . . . . . . . . . . . . . . . 4 Additional Information on Bleeding the Brakes. . . . . . 4 Extended Cold Crank with DI Engines. . . . . . . . . . . . . 4 Rear Differential Control Module Reprogramming . . . 5

Smart System

No Fob Detected Message. . . . . . . . . . . . . . . . . . . . . 5

The wiper system uses smart motors. The motor module ­circuitry monitors motor position and reverses power and ground to the motor to reverse wiper direction. It does not use a bell crank. If the system is allowed to run on dry glass the motors detect the increased friction and the wiper speed will slow to a low pulse rate. As soon as moisture is applied to the glass, the motors will

CONTENTS

HVAC Control Module DTC U1510 . . . . . . . . . . . . . . 5 Door Trim Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Corvette Radio Control Assembly Replacement. . . . . 6 Transmission Information Summary. . . . . . . . . . . . . . . 6 Brake Booster Noise with Brakes Applied . . . . . . . . . 7 No Start Due to Improperly Installed Accessories. . . .7 Heated and Ventilated Seat Operation. . . . . . . . . . . . 7 Whine Noise at Start-up. . . . . . . . . . . . . . . . . . . . . . . 8 Inaccurate Outside Air Temperature Reading. . . . . . . 8 Service Know-How . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Car Issues – Fix It Right the First Time. . . . . . . . . . . . 9 The smart wiper system includes left and right wiper motor modules.

Truck Issues – Fix It Right the First Time. . . . . . . . . . . 9

Customer Care and Aftersales

continued on page 2

ELR Smart Wiper System – detect the change in resistance and will switch back to the set speed.

continued from page 1

Prior to installing the arm, turn the ignition on and turn the wiper switch to the Low setting. Check that the wiper motor shaft is ­rotating back and forth, and then turn the wiper switch off. Keep the ignition on. This will command the motor to the park position.

If one arm is stuck, such as on ice, the other arm may continue to function. If the system determines that the wipers may contact each other because one blade is stuck, the other wiper also may stop.

Use a battery terminal puller to remove the arm from the pivot shaft. Each arm operates independently from the other.

Place the blade on the glass at the alignment circle and then install the arm on the wiper motor shaft by pressing down at the wiper arm knuckle joint. Install the nut onto the motor shaft by hand. Recheck blade alignment with the mark on the lower windshield before tightening the nut to specification.

Alignment Wiper arm alignment is critical for the wipers to operate properly. If an arm is incorrectly aligned or timed, the wipers may collide on the glass, wipe off the glass and over the A pillar, strike the air inlet grill, or not completely wipe the windshield.

Test the system to ensure that it is operating correctly in all modes and that the blades properly sweep the windshield. Be sure to reinstall the wiper arm cap.

There are small transparent alignment circles in the lower center blackout area of the windshield glass that are used for proper alignment. The alignment circle for the right blade (passenger’s side) is near the center point of the blade and, for the left blade (driver’s side), the alignment circle is near the tip of the blade when the wipers are in the park position.

Wiper Motors TIP: Before removal or replacement of either wiper motor, the High Voltage Disabling procedure must be performed. High voltage wiring is located next to the wiper motors.

Alignment circles in windshield blackout area. The wiper motor is secured with two bolts.

To retime a wiper arm, with the wiper switch and ignition off, begin by removing the wiper arm cap. Use a small flat-blade tool to gently pry up at the small indentation on the rear of the cap to remove it. This provides access to the nut that retains the arm on the motor. While holding the wiper arm, remove the nut.

To remove either wiper motor, first remove the wiper arms and then remove the air inlet grill. Each wiper motor is secured with two mounting bracket bolts. With the bolts removed, gently pull the motor forward to avoid damaging the windshield or any painted surface. Release the lock tab and disconnect the electrical connector to remove the motor.

Use a battery terminal puller to grasp the wiper arm flange and pull the wiper arm from the pivot shaft. Do not rock the wiper arm to remove it from the pivot shaft or the motor mounting bracket may be damaged. Clean the pivot shaft with a soft wire brush to remove any debris.

The left and right wiper motors have different internal circuitry and are not interchangeable. Swapping left and right motors will cause both wipers to be inoperative. Each motor and motor bracket has a different part number. All are available as separate parts. continued on page 3



2

March 2014

New Door Latch Design

Previous door latch design

The door latch design on the 2014 Silverado 1500, Sierra 1500, Impala, CTS Sedan; and 2013-2014 XTS and ATS has changed to a new design that operates slightly differently from the previous common GM design. On the previous generation door latch, the closed fork bolt would open when the outside door handle lever was pulled.

New door latch design

must be applied to release the bolt. This new design provides ­enhanced sound quality when opening and closing. Technicians that close the latch when working on a vehicle stop the door chime from sounding willl need to open the latch manually before closing the door. Do not replace a door latch because the bolt does not spring open. Thanks to Keith Borowy

On the new generation door latch, the closed fork bolt does not open freely when the outside door handle lever is pulled. Force

ELR Smart Wiper System –

continued from page 2

Wiper motor bracket breakaway points. Bracket alignment locator.

Mounting Brackets Each wiper motor bracket is part of the Pedestrian Protection package on the ELR. As part of the safety system, there are two breakaway points on each bracket. TIP: To prevent bracket damage, the wiper arm must be removed with a battery terminal puller and not wiggled off or struck with a hammer. This type of force can cause stress fractures at the breakaway points that may cause the bracket to fail at any time. If the bracket is dropped during service it must be replaced to ensure proper operation.

March 2014

Before installing the wiper motor, insert the alignment locator on the back of the bracket into the retainer on the vehicle. Reattach the electrical connector before carefully sliding the motor into ­position For more information about the ELR wiper system, check out the February 2014 Emerging Issues seminar, 10214.02D (U.S.). In Canada, see the March 2014 TAC Talk program. Thanks to Chuck Wieseckel

3

Brake Noise on Initial Brake Apply

Additional Information on Bleeding the Brakes

An intermittent brake squeal or squeak noise on the initial brake apply may be heard on some 2013-2014 Regal GS, ATS (equipped with RPO J55), XTS (equipped with RPO J64); 2014 CTS Sedan (equipped with RPO J55 or J56), Corvette, and SS models.

Several additional steps are needed to perform a successful brake bleed on the 2011-2014 Volt and 2014 ELR.

The squeal or squeak noise from the front brakes or rear brakes (Corvette only) usually only occurs on initial brake applications after the vehicle has sat for an extended time. The condition occurs under light braking in speeds under 10 mph (16 km/h). After 1-6 brake a ­ pplies, or after braking at higher speeds, the noise no longer occurs. In addition, this condition may occur more often in high ­humidity conditions. TIP: Do not apply lubricant to the back of the backing plate. Apply a light coat of lubricant, part number 19303310 (In Canada, part number Apply lubricant to the pad backing plate abutments. 19303311) to completely cover the front or rear disc brake pad backing plate abutments on each end. The lubricant should not extend onto the friction material.

The braking system on these models is unlike most traditional hydraulic brake systems. It is very important to follow the brake bleeding procedure exactly. Air trapped in the brake system will cause performance problems and DTCs without the symptoms of a spongy or low brake pedal. If a step is missed in the brake bleed procedure, the procedure must be started over at step 1 without exception. Follow these guidelines when bleeding the brake: • Install a battery charger on the vehicle to maintain battery voltage. • Use a pressure bleeder, such as tool J-29532-B, that is capable of delivering 30 psi for the entire bleed procedure. Failure to provide a constant 30 psi will cause air to be trapped in the brake system and may cause brake ­performance problems or DTCs to occur. Vacuum bleeding and other brake bleeding tools are NOT acceptable for this procedure. TIP: The dealership must use a J-29532-B pressure bleeder or a diaphragm type (ball bleeder) pressure bleeder along with the J-35589-A Brake Pressure Bleeder Adapter in order to perform the hybrid brake system bleed procedure. A replacement J-29532-B can be ordered from 1-800-GM-TOOLS. • Do not attempt to use the manual bleed procedure as this will not properly bleed all the air from the system. Thanks to Paul Radzwilowicz

Thanks to Mark Gordon

Extended Cold Crank with Direct Injected Engines The 4.3L, 5.3L, and 6.2L (RPOs LV3, L83, L86 and LT1) direct injected (DI) engines available on some 2014-2015 Corvette, Silverado 1500, Suburban, Tahoe, Sierra 1500 and Yukon models may have an extended or long crank time during cold ambient air temperatures. Direct Injection engines may have slightly longer cold crank times than that of port fuel injected engines. Direct Injection systems run at higher pressures and the mechanical pump on the engine must build up the required pressure before the first injection event occurs. Following are typical DI engine crank times using gasoline: Start up Coolant Temperature

Crank Time

Above 50°F (10° C)

up to 1.5 seconds

Between 50°F (10°C) and 14°F (-10°C)

up to 2.5 seconds

Between 14°F (-10°C) and -4°F (-20°C)

up to 3.5 seconds

Between -4°F (-20°C) and -13°F (-25°C)

up to 5 seconds

Between -13°F (-25°C) and -22°F (-30°C)

up to 7 seconds

If the temperature is below -22°F (-30°C), the recommendation is to perform an assisted start (such as with the use of a block heater). For ethanol fuel, see #PIP5174: Extended Engine Crank Times When Using E85 Thanks to Richard Renshaw



4

March 2014

Rear Differential Control Module Reprogramming

No Fob Detected Message

The All-Wheel-Drive (AWD) indicator may be illuminated or an AWD Disabled message may be displayed in the Driver ­Information Center (DIC) on some 2013-2014 Encore and Trax (Canada only) models equipped with AWD.

A No Fob Detected message may be displayed on the Driver Information Center of some 2004-2009 XLR and 2005-2013 ­Corvette models when attempting to start the vehicle. The engine may not crank/start and the vehicle's doors may not open through passive entry. However, the vehicle will always start when the Remote Keyless Entry transmitter (key fob) is placed in the instrument panel compartment pocket. This condition may be caused by an internal transistor of the Remote Control Door Lock Receiver (RCDLR) module not operating properly.

Code 173 may be set. Code 173 is not a DTC, but an action taken by the Rear Differential Control Module. If any DTCs are set, follow the diagnostics in the appropriate Service I­nformation. This condition may be caused by the software in the Rear ­Differential Control Module (RDCM). Updated Rear Differential Control Module software has been released to address this condition. If Code 173 is observed, reprogram the Rear ­Differential Control Module using the latest available software in TIS2Web. Thanks to Bob Kerzka

To diagnose this condition, be sure the vehicle battery is ­adequately charged to start vehicle. Next, remove the battery from the key fob. Using a DVOM, ­measure the voltage. Be sure the key fob battery voltage is ­between 2 to 3 volts. If not, replace the battery. Test operation of the vehicle again. If the vehicle no longer exhibits the condition, the vehicle is repaired.

HVAC Control Module DTC U1510 During diagnosis of various heating and cooling conditions on some 2014 Camaro models, a current or history DTC U1510 (Lost Communication) may be set in the K33 HVAC Control Module. This DTC will set for a loss of comHVAC control module munication with the A20 Radio/ HVAC controls on the LIN Bus.

Corvette RCDLR module

It has been found through warranty reviews that many HVAC modules have been reprogrammed for various HVAC issues if the original condition could not be duplicated. While there is an updated calibration available for the HVAC module in the 2014 Camaro, performing this update alone will not address the loss of communication DTC that was set in the system. Instead of reprogramming, inspect the connections at the HVAC control module, which is located next to the blower motor under the passenger’s side of the instrument panel. Carefully inspect both connectors to make sure they are fully seated. Also inspect terminal tension using the appropriate ­diagnostic test probes; currently J-35616-16 (L-GN) and J-35616-64B (L-BU) for connectors 1 and 2, respectively. ­Replace any loose terminals as needed. If no issues are found, flex the wiring harness in an attempt to duplicate the condition. If still no issues are found, carefully remove the radio faceplate from the radio itself and check the direct connections at that location. Thanks to Matt Bierlein

March 2014

XLR RCDLR module

If the vehicle has a known good key fob (not placed in the instrument panel compartment pocket), press the Engine Start Button and listen for a click noise or a series of click noises from the RCDLR. If there is only one click (instead of a series of clicks), the transistor internal to the RCDLR is not operating properly. For this condition, replace the RCDLR module. The RCDLR module on the Corvette is located above the radio behind the instrument panel trim on the right side. On the XLR, the RCDLR module is located on the top right of the instrument panel under the upper instrument panel pad. Thanks to Matt Bierlein 5

Door Trim Removal The side door lock lever may be damaged if the door trim is removed improperly on 2014 Silverado 1500 and Sierra 1500; 2015 Tahoe, Suburban, and Yukon models; 2014 Impala and CTS sedan; and 2013-2014 ATS models. These models are equipped with the Generation 2 door latch that uses the cross-car load belt clips for door trim attachment.

Correct door trim removal with the lock rod disconnected. Cracked inside lock lever

When removing the door trim for service, if the lock rod is left in the trim, it can be bent too far and damage the lock lever on the door latch.

To properly remove the door trim, control the angle of the door trim at the belt line so it stays close to the glass while removing the trim clips. Remove the lock rod from the trim before disconnecting the inside door handle cable and electrical

Incorrect door trim removal with the lock rod left in the trim.

connector. This will protect the lock lever from damage. Thanks to Keith Borowy

Corvette Radio Control Assembly Replacement The radio control assembly on the 2014 Corvette is secured by 10 TORX PLUS® Tamper-Resistant fasteners. Removal of the assembly requires a T20 TORX PLUS® Tamper-Resistant drive tool. The TORX PLUS Tamper-Resistant fasteners have a post in the center recess of the head and a five-point design, not the standard TORX PLUS six-point design. The drive tool is available from various aftermarket tool suppliers. Be sure to have all proper tools on hand before beginning a repair procedure. To remove the assembly, the instrument panel trim plate must first be removed. Pull the radio knobs straight off to allow the radio control to be separated from the trim plate. Refer to the appropriate Service Information for the complete repair procedure. Thanks to Rick Gatt

A T20 TORX PLUS® Tamper Resistant drive tool is required to remove the radio control assembly fasteners.

Transmission Information Summary An updated summary of important transmission-related bulletins and Preliminary Information (PI) has been recently released to help build awareness of the latest transmission information available. The list provides a convenient ­resource for transmission technicians when performing transmission repairs. The transmission information summary is included with this edition of TechLink. Prior to beginning any repairs, it’s critical to always follow Strategy-Based ­Diagnostics and check the appropriate Service Information for any bulletins or PIs that may apply. In addition, go to www.centerlearning.com to learn more about the transmission training classes that are available in your area and online. In Canada, refer to the course catalog at www.gmprocanada.com. Thanks to Mike Johnston

6

March 2014

Brake Booster Noise with Brakes Applied On some 2013 Encores, an intermittent hoot, howl, whistle, whine or buzz noise may be heard when the brake pedal is applied while at a stop. The noise may seem to be originating at the auxiliary vacuum brake assist pump or the brake booster area. The noise condition may be very intermittent and difficult to duplicate. It also may seem to happen in higher ambient temperatures and with a hot engine after an extended drive. If the noise is present, replace the brake booster vacuum hose with P/N 95412981. For repair information, refer to the Power Brake Booster Vacuum Hose Replacement section of appropriate Service Information. Thanks to Matthew Zajechowski Power brake booster vacuum sensor and hose assembly.

No Start Due to Improperly Installed Accessories On some 2008-2014 Enclave, 2009-2014 Traverse, 2007-2014 Acadia, and 2007-2010 Saturn Outlook models, the Service ­Engine Soon (SES) light may illuminate or the battery may drain overnight. During diagnosis, a 4.1 amp draw on the electrical ­system may be found. The draw may be steady or may drop down to a low milliamp reading for 1-2 seconds and then rise back up near 4.1 amps. This condition may be caused by non-GM Accessories aftermarket products or an improperly installed GM Accessories product that is wired into circuit 1732 for the courtesy lamps. If an aftermarket accessory is installed into the courtesy lamps circuit, the inadver-

tent power timer in the Body Control Module (BCM) may continuously reset. If this occurs, the BCM may remain awake and cause excessive battery drain. When servicing a vehicle with this condition, back out pin 1 of connector 2 at the BCM and check if the draw goes away. If the draw goes away, check for an aftermarket accessory (such as a security system, non-factory DVD system, alarm, etc.) that is improperly wired into circuit 1732. Thanks to James Miller

Heated and Ventilated Seat Operation during a Remote Start On the 2014 Chevrolet SS, the heated or ventilated seats must be enabled through the personalization menu or they will not turn on during a Remote Vehicle Start event. After verifying that the vehicle's heated or ventilated seats will not turn on after a remote start has been initiated, check the vehicle's personalization menu to see if these options have been enabled. The heated and ventilated seats both have to be selected independently in order for each to operate. To turn on both options, navigate to the Vehicle Settings > Climate and Air Quality menu and select both the ­Remote Start Auto Cool Seat option and Remote Start Auto Heat Seat option. The system uses the information obtained from the Outside Ambient Temperature sensor on the vehicle. When it reads 80°F (27°C) or higher, it will allow the operation of the ventilated seats during a remote start. When it reads 50°F (10°C) or lower, the system will allow operation of the heated seat during a remote start. If the sensor reads anything in between these temperatures, neither the heated nor ventilated seats will turn on regardless if they are enabled in the personalization menu. Thanks to Matt Bierlein

March 2014

7

Climate and Air Quality menu

Whine Noise at Start-up A loud whine noise when the vehicle is first started may be heard from under the hood on the passenger side of some 2010-2014 Lacrosse and 2011-2014 Regal models. The noise may seem to be coming from the generator, but is a result of normal operation from brake booster electric vacuum pump, which is located behind the right front wheelhouse liner. TIP: During diagnosis, if the generator is disconnected, the noise will be gone. However, it’s important to note that when system voltage is changed, vacuum pump voltage and RPM are also affected.

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: Brake booster electric vacuum pump

John Meade GM Customer Care and Aftersales

2010 LaCrosse and 2011 Regal with2.4L Engine (RPO LAF)

Editor:

With the engine and ignition off, apply or pump the brake pedal three times to deplete the vacuum reserve. Turn the ignition to Run with the engine off. The brake booster electric vacuum pump should be heard running at the right front wheel opening below the generator. The pump should run for approximately 10 seconds and then shut off; with a ­maximum run time of 20 seconds.

Technical Editor:

Lisa G. Scott GM Customer Care and Aftersales Mark Spencer / [email protected]

If required, compare to a known good vehicle. Replace the brake booster electric vacuum pump only if an abnormal noise is heard.

Production Manager:

2011-2014 LaCrosse and 2012-2014 Regal

Graphic Design:

Marie Meredith

With the ignition on and engine off, use GDS2 to select Module Diagnosis > Electronic Brake Control Module > Control Functions > Brake Booster Electric Vacuum Pump.

5by5 Design LLC / [email protected]

Command the pump on. It should be heard running at the right front wheel opening below the generator. Confirm this is the source of the condition.

FAX number:

If required, compare to a known good vehicle. Replace the brake booster electric vacuum pump only if an abnormal noise is heard.

Write to:

GM TechLink on the Web:

: GM GlobalConnect

Inaccurate Outside Air Temperature Reading On some 2014 Camaro models, the ambient air temperature display in the instrument ­cluster may be inaccurate. No DTCs will be set. The inaccurate temperature reading is caused by a software anomaly inside the instrument panel cluster. A new calibration has been developed to correct this condition and is available in TIS2 Web. Reprogram the instrument panel cluster with the updated calibration. Thanks to Matt Bierlein

Service Know-How



* TechLink

PO Box 500 Troy, MI 48007-0500

Thanks to Christopher Crumb

10214.03D Emerging Issues

3 1-248-729-4704

March 13, 2014

To view Emerging Issues seminars: • Log in to www.centerlearning.com – Select Resources, and then Video on Demand; or – Select Catalog to search for the course number, and then select View > Take or Continue Course

8

General Motors service tips are intended for use by professional ­technicians, not a “do-it-yourselfer.” T­hey are written to inform those ­technicians of conditions that may occur on some vehicles, or to provide­information 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© 2014 General Motors All rights reserved.

March 2014

Car Issues – Fix It Right the First Time Reference Information/ Bulletin

Model Year(s)

Vehicle Line(s)/Condition

2008-2012

Malibu — HVAC Stuck in Defrost Mode, DTCs B0248, B0268 or B0408 Set

Reprogram HVAC control module.

Replace HVAC control module, replace actuators, replace HVAC case, or replace wiring harnesses/connectors.

PI1152

2013

Malibu, LaCrosse — Fuel Gauge Does Not Read Full, Only Goes to 7/8 Full

On listed models only, install new design fuel level sensor kit and fuel fill shutoff valve.

Install components on other model vehicles, replace fuel tank, replace fuel pump module, replace engine control module.

PI1161

2010-2014

Verano, Regal, Malibu, LaCrosse, Impala, Cruze — Engineering Information - Sunroof or Sunshade Inoperative, DTC U151B Set

Call engineers listed in PI.

Unplug modules, pull fuses, or disconnect battery.

PIE0279

2013-2014

ATS — Temperature Information for Driver and Passenger Heated Seat

Measure temperature difference.

Replace seat cushion.

PI0990A

2013

ATS — Water on Front Compartment Floor and/or Musty Odor

Inspect the drain and apply cooling coil sealer.

Remove HVAC case.

PI1160

2012-2014

Regal GS, CTS Vsport, Camaro ZL1, Camaro Z28, Camaro SS (RPO 1LE), Corvette, Corvette Z51, Corvette SS — Information on Tire Cold Weather Cracking

Install winter tires if driving or moving the vehicle below 20 degrees F (-7 degrees C). Refer to 04-03-10-013H for winter tire recommendations.

Drive or move the vehicle with these tires below 20 degrees F (-7 degrees C).

13-03-10001A

2014

Impala — Engineering Information - Inside Rearview Mirror Loose or Falls Off

Replace windshield.

Reattach bracket.

PIE0278

2008-2014

Solstice, Sierra, Savana, TopKick, Sonic, Cruze, HHR, Cobalt, Silverado, Express, Kodiak, SRX, Regal — Damaged, Disassembled or Improperly Packaged Turbochargers Returned to Warranty Parts Center

Properly and securely package the old turbocharger in the original shipping container from the replacement part with the upper and lower packaging locators installed correctly. Complete and detailed description of the fault on the repair order will also aid in evaluating the fault of the returned part.

Remove any part from the turbocharger assembly, even to remove it from the vehicle. It is not necessary to remove any component of the turbocharger to remove it from the vehicle. Do not disassemble the turbocharger to diagnose the fault. No component needs to be removed for diagnostic reasons.

PI0653A

2009-2014

Sonic, Wave, G3, Aveo, Cruze — Normal Engine Cylinder Bore Marks

Re-use the engine block with these normal honing marks.

Replace the engine due to normal cylinder bore marks as pictured in this bulletin. Use proper cleaning methods when conditioning the block for a repair. Do not use abrasive pad/ bristle devices to clean the gasket surfaces of engine components.

PI0725A

2011-2013

Buick LaCrosse, Regal, Verano, ATS, Cruze, Orlando, Malibu — MIL Illuminated, DTC P0442 Set - EVAP System Small Leak Canister Vent Solenoid (CVS) Valve Not Sealing Under Vacuum

Use the labor code designated in this bulletin when replacing the canister vent valve.

Do not use the labor code for the EVAP purge solenoid when replacing the canister vent valve.

PI0979

2013-2014

ATS, CTS, Camaro — MIL Flashes Due to Engine Misfire On Acceleration, DTC P0300 and/or P0303 Set

Load new calibration enhancement for diagnostic for DTC P0300/P0303 misfire on vehicle where the MIL is Illuminated between 2200 to 4400 RPM.

Replace spark plugs, ignition coils and fuel injectors for DTC P0300 / P0303 and MIL set between 2200 to 4400 RPM.

PI1122A

2011-2014

Volt — Service High Voltage Charging System Message Displayed on Driver Information Center, Hybrid/EV Charging System Disabled, DTCs Set, Revised HV Battery Surge Tank Coolant Fill Level

When the battery coolant is low, it is imperative that the system be pressure tested per PI0961.

Add coolant to reservoir before pressure testing and verifying battery coolant system integrity.

PI0961C

2014

Corvette — Instrument Panel Brightness Too Low

Reflash the BCM. IPC, HVAC module and Radio. All modules must be programmed separately.

Replace the instrument cluster or BCM.

PI1101B

2014

Corvette — Additional Diagnostic Tips for Headlamp Inoperative or Intermittent Conditions

There are several connections that can be verified and corrected that do not require the replacement of the headlamp assembly.

Replace the headlamp for in inoperative or intermittent inoperative condition until checking the connections outlined in the bulletin.

14-08-42-001

2012-2014

Cruze — Starter or Flywheel Knock Noise On Start-Up

Replace the starter and fuse block.

Replace the flywheel.

PI1175

Do This

Don’t Do This

Truck Issues – Fix It Right the First Time Model Year(s)

Reference Information/ Bulletin

Vehicle Line(s)/Condition

Do This

Don’t Do This

2009-2014

Outlook, Terrain, Acadia, Impala, Equinox, Camaro, Traverse, XTS, ATS, CTS, SRX, STS, LaCrosse, Enclave — Information on Clicking/Ticking Sound/Noise Heard During Cold Start

Listen to the high pressure pump with chassis ear to locate. Noise on cold start should become less after 35 seconds of operation.

Replace high pressure pump for normal noise.

07-06-04025I

2014

SRX — DTC U0121 Falsely Set

Install the revised BCM calibration to resolve the communication code.

Replace the BCM or EBCM for the loss of communication code concern.

PI1158

March 2014

9

Customer Care and Aftersales

IMPORTANT BULLETINS AND PIs FOR TRANSMISSION TECHNICIANS The listing below is accurate as of March 1, 2014 and will change with time. It is important to follow strategy-based diagnosis and check eSI for the latest bulletins and PIs. This list is also published in TechLink, March 2014. TechLink can be accessed through the eSI home page. TRAINING TECHNICAL ASSISTANCE CENTER Transmission Training Classes Dealers can contact TAC with the available in www.centerlearning.com phone number provided.

Transmission

Models

Bulletin #

Subject

6Lxx

2007-2013 All RWD SRX, STS, CTS, Camaro 6L45/6L50 2010-2013 All 6L80/6L90 2012 Full Size Trucks 5.3L (LC9, LMG) & 6L80 2013-2014 ATS 2014 Corvette

6T40

2011 All 2010-2013 All 2012-2014 1.4L (LUJ, LUV) & 6T40 2014 Mailbu 2014 Mailbu

PI1131 PI0950 PI0928B PI1071 PI1172

Various Missing Gears, DTC P0776, P0796, P0878, P0873, P2714 or P2723 Set PI0950: Automatic Transmission Fluid Leak from Torque Converter Housing Area PI0928B: Bump, Surge or Vibration at Idle in Drive at a Stop Transmission Fluid Leak at Auxiliary Pump Seal Bump on Launch, No Auxiliary Pump Pressure, DTC P2797 Set

2013 All Except Impala & LaCrosse

PI0893

2013 All Except Impala & LaCrosse, 2014 Impala

PI0999

PI0893: Diagnostic Information for DTCs P0965, P2719 and/or P2728 Malfunction Indicator Lamp (MIL) On, Torque Converter Clutch Sticking, Engine Shudder When Stopping, DTC P0742 Set

6T70

Allison

CVT7

Aisin

PIP4554J

Clunk Noise After Shifting From Reverse To Drive Or Drive To Reverse And Then Accelerating

PI0488D PI0952 PI1155 PIP5170

Diagnostic Information for Transmission No Forward, No Reverse, Slips, Cracked/Split Fluid Filter PI0952: 2–3 Shift Flare Cold PI1155: Shudder Feeling While Driving in the 40-80 km/h (25-50 mph) Range PIP5170: Driveline Support Torque Tube Automatic Transmission Noise Diagnostic Tip

2013 Silverado, Sierra 2001-2014 Silverado, Sierra

PI1154 PIP4379K

PI1154: Delayed 1-2 Upshift While Driving at or Below 15 Percent Throttle PIP4379K: Delayed Or No Drive And Or Delayed Or No Reverse With DTCs, Range Inhibit

2014 Spark 2014 Spark 2014 Spark 2014 Spark

PI1039 PI1024A PIP5120 PI1053A

Identification and Location of the Transmission Control Module (TCM) and the Engine Control Module (ECM) 2014 Chevrolet Spark New Product Information for Jatco CVT Automatic Transmission 2014 CVT Transmission Assembly Exchange Malfunction Indicator Lamp (MIL) On, DTC P0885 Set, Transmission Slipping on High Engine RPM

2013 Spark

PIP5101

2011 Regal

11-07-30-001

Intermittent Lack of Power - Transmission Will Not Shift - PRNDL Goes Blank or DTC P0705 Delayed Transmission Engagement into Drive and Reverse Until Engine RPM is Increased to 1200-1500 RPM, No DTCs Stored in TCM (Reset Engine Stall Avoidance Drive Pattern)

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IMPORTANT BULLETINS AND PIs FOR TRANSMISSION TECHNICIANS Transmission

Models

Bulletin #

Subject

FWD Manual

2012-2013 Sonic PI0735B Grinding Noise Heard When Shifting into Reverse 2011-2014 Cruze, Regal, 2012-2014 10-07-29-001B 6-Speed Manual Transaxle Service Strategy Orlando, Sonic, 2013-2014 Verano 2012-2013 Buick Verano and Regal PIP5042B Vibration In Second And Third Gears Only 2011-2015 Cruze, Regal, 2012-2015 Sonic, PIP5043A Intermittent Grind Growl Noise On 1-2 Shift First Shift Of Drive Cycle Verano 2012 - 2013 Chevrolet Cruze w 1.8L Engine PIP5150A Rattle From Engine Area At Start-Up

RWD Manual

2013 -2014 Cadillac ATS

13444

Service Update Dual Mass Flywheel Protection

Transfer Case

2011-2013 Silverado, Sierra

PI0921

Noise From Transfer Case In Four Wheel Drive

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