Archive for January 2014

CH-51450 Oscilloscope Diagnostic Kit with NVH

Vehicle noise, vibration and harshness (NVH) are significant reasons for customer dissatisfaction. But quickly identifying the cause of a vibration and finding its location can be a difficult task, even for the most experienced technician.


Traditional diagnostic methods require the technician to determine the frequency of the vibration (Hertz) during a road test, and then to figure out which component was rotating at the RPM necessary to cause the frequency observed. This requires directly measuring the dimensions of various components, and/or looking up dimensions in specification charts and applying mathematical calculations to arrive at a conclusion.


An Easier Method


Now, there’s an easier method to NVH diagnosis. The CH-51450 Oscilloscope Diagnostic Kit with NVH provides a more accurate analysis of vehicle noise, vibration and harshness conditions. Using the display of your existing laptop computer (Fig. 1), this system combines fast capture and analysis of vehicle data with a clear easy-to-read presentation of results and actions.


F01 scope-laptop

Fig 1


The kit will be auto-shipped to select dealers in the first quarter of 2014. It is also available to order by calling 1-800-GM-TOOLS. In Canada, contact Dealer Equipment & Services (DES) Canada at 1-866-868-3372.


By providing a variety of information in one tool while using the power of your laptop, it also offers the flexibility and readiness for a host of new applications in the future.




The CH-51450 Oscilloscope Diagnostic Kit with NVH is able to provide answers to many NVH conditions technicians face each day. Its real-time diagnosis is presented as a bar graph, a frequency chart, a 3D frequency chart, RPM order or a road speed view.


The software is compatible with Windows Vista and Windows 7.


During diagnosis, the recording can be started before a road test, and then played back for analysis after returning to the dealership. This ensures that your attention remains on the road. Saving the recordings couldn’t be simpler: simply save the file to the laptop’s hard drive.


When performing driveline balancing, clear advice, analysis and step-by-step procedures are provided for pinion flange, dual hose clamp and trial weight balancing. (Fig. 2)


F02 balancing

Fig 2


CH-51450 Oscilloscope Diagnostic Kit with NVH


The kit (Fig. 3) contains the following items:

• GM-branded 4423 4-channel PicoScope

• Protective rubber boot and hook for Scope

• USB cable

• GM Spec NVH & Balancing Software

• NVH Interface

• Accelerometer

• Magnet

• BNC Cables (2) 3 m extension leads

• Optical Tachometer Sensor

• Optical Tachometer Power Adapter

• Magnetic Mounting Fixture

• Carry case with custom foam

• Quick Start Guide

 F03 CH-51450 new

Fig 3


The simple bar charts and results provide quick diagnosis and are easy to use. (Fig. 4) Full analysis and advanced features (including waterfall and spectral displays) are at your fingertips.


F04 Bar Graph

Fig 4


The kit is designed for road testing, workshop diagnosis and driveline balancing. It detects multiple vibrations and noises, isolating each and providing help and advice on causes and fixes.


The kit works with the Multiple Diagnostic Interface (MDI) or any J2534 interface to acquire vehicle data. It also can be used without a scan tool, which may be particularly useful for older non-OBD vehicles.


The full screen, high-resolution results are presented clearly and accurately with all data and results captured on the laptop for playback, analysis or sharing. Up to 500 seconds of data, with automatic analysis, can be recorded. An unlimited number of road tests, stored as laptop data files can be attached to customer records. The data files also can be emailed, making it easier to get assistance from the GM Technical Assistance Center during NVH diagnosis.


In addition, the customer report function can be helpful to explain the diagnosis and repair along with reassuring them that the proper repairs have been made.


– Thanks to Chuck Berecz

Check Dealer IT Guidelines before Buying New Computer Hardware

Technicians looking to work more efficiently may consider buying a laptop (or notebook) computer for use in the dealership service department. With their easy mobility, laptop computers make it easier to perform diagnostics on a road test and reduce the time away from the vehicle at a desktop PC.


Before purchasing a computer for use in the dealership, the GM Service Department IT Guidelines should be reviewed to ensure that the computer meets or exceeds the minimum specifications. The GM Dealership Infrastructure Guidelines – Service Department can be accessed at


(In Canada, the IT guidelines are in the Service Library under Tools, Processes and Equipment on Global Connect.)


The guidelines specify that the computer must include business grade hardware that meets or exceeds the minimum specification with Intel Processors and runs the Windows 7 Professional 32 bit or 64 bit operating system.


Prior to purchasing a business grade laptop, review the table on page 2 for what is “supported and not supported” for Techline applications. (Fig. 5)

 F05 guidelinesFig 5


Techline does not support consumer branded PCs, built by hand and/or home grade operating systems typically used for multi-media or gaming purposes. Techline also does not support AMD processors. Extensive testing of consumer targeted computers and operating systems show they are not suitable for diagnosing vehicles using Techline software applications. Techline applications are considered business class and are intended to run on a business grade computer.


Dealership PC and Infrastructure Guidelines for the service department are updated a minimum of twice a year so it’s important to check the guidelines just before making a purchase in order to be sure that the computer meets the latest specifications.


The Techline Customer Support Center (TCSC) will provide troubleshooting assistance to technicians who purchased their own computer as long as:

• Permission to use the computer on the dealership network has been granted in advance

• The computer meets or exceeds the specifications as outlined


As a reminder about Techline support in the dealership, Techline applications (TIS2Web, GDS 2, MDI, Tech2Win, etc.) are compatible with the Windows 7 Professional (32 and 64 bit) operating system. Techline applications are not compatible with the Windows 8 Professional operating system at this time.


TIP: Beginning January 1, 2014, the Techline Customer Support Center (TCSC) ended any assistance for computers running Windows XP. Dealerships should replace any PCs that have this operating system. For enhanced convenience and portability, laptop computers are recommended as replacements instead of desktop PCs.


Any questions about computer specifications in the U.S. and Canada can be directed to the TCSC at 1-800-828-6860 (English) or 1-800-503-322 (French).


– Thanks to Lisa Scott

Spark EV DC Fast Charge System

Some Spark EV owners now have three options when charging their Spark EV, if equipped with the new DC fast charge system. (Fig. 6)



Fig 6


The standard charging process for the Spark EV uses the included 120V onboard charger and charge cord. It takes about 20 hours to fully charge an empty Spark EV battery at the 12 amp setting. Or owners can use a dedicated 240V charging station at their home or at some public locations. Fully charging an empty battery using a charging station will take about seven hours.


The new third option now available to Spark EV owners is through DC fast charging (RPO CBT), if equipped. With DC fast charging, an empty Spark EV battery will be charged to 80 percent in approximately 20 minutes. A full charge will take longer. Spark EV models not originally equipped with the DC fast charge system cannot be retrofitted with the capability.


The Spark EV is being sold in California and Oregon. It also is available for fleet sales at select locations in Canada.


In the U.S., commercial DC fast charging stations are becoming available at service stations and other public locations. DC charging stations are not planned for residential use. A charging network service such as ChargePoint can help owners locate public chargers in their area. Owners also can search for charging stations from the Spark EV page on


The electric charge portal on the front driver-side of the vehicle supports all three charging methods (if equipped with RPO CBT). Charge times vary based on outside temperatures.


DC Fast Charging System


The DC high power fast charge system consists of the stationary DC high power charging unit, the SAE Combo Connector and the receptacle (combined AC and DC charging connector), High Power Charge Contactors (HPCC), and the hybrid/EV battery pack. The high voltage DC current is directly supplied to the hybrid/EV battery pack through the High Power Charge Contactors, bypassing the battery charger, often referred to as the drive motor battery charger.


The DC fast charge receptacle, identified by an orange cap, has a locking mechanism that locks the SAE Combo Connector while power is being transferred to the hybrid/EV battery pack. (Fig. 7) The mechanical lock is a safety system that is controlled by hybrid/EV Powertrain Control Module 2. Once charging, the electric parking brake is automatically applied. It must be disengaged manually once charging is completed.



Fig 7


Charging can be stopped using the controls at the charging station, from the Battery Information screen inside the vehicle, or with the Remote Keyless Entry transmitter Stop Charge button.


The hybrid/EV Powertrain Control Module 2 monitors and verifies the following conditions before the charging process can begin:

• The stationary charging unit is capable of providing high voltage DC power to the hybrid/EV battery pack.

• The hybrid/EV battery pack temperature can be maintained within the normal operating range.

• No high voltage electrical safety faults are present.

• High voltage DC connector locking mechanism is operating properly.

• Vehicle immobilization is successful, if equipped.

• If any of these conditions fail during the charging process, the charging process will be terminated.


The SAE Combo DC fast charge connector (Fig. 8) standard has been adopted by many major automakers, including GM, Ford, BMW and others. It is not compatible with the CHAdeMO DC fast charge format used by Nissan.


F08  Spark ev charge port

Fig 8

AC Charging


In addition to DC fast charging, the Spark EV can be charged using the two AC charging systems.


120V Charging

• 120V onboard charger and charge cord (standard equipment)

• Requires a 120V outlet with at least a 15-amp circuit

• Can charge at either 8 or 12 amps


240V Charging

• Dedicated 240V charging station

• 240V home charging station available from Bosch Automotive Service Solutions ((professional installation is required)

• Requires at least a 20-amp circuit


– Thanks to Kristin Curran



Blank Touch Screen after Start-up and in Reverse

The infotainment touch screen may be blank after start-up and in Reverse, a rearview camera message may be displayed, and there may be Bluetooth® and navigation system conditions on the following models equipped with radio-infotainment system RPOs IO4, IO5, IO6 or RAO (except with RPO UPF):

• 2014 LaCrosse built prior to September 24, 2013

• 2014 Regal built prior to August 26, 2013

• 2013-2014 ATS built prior to September 23, 2013

• 2013-2014 SRX built prior to September 12, 2013

• 2013-2014 XTS built prior to August 21, 2013

• 2014 CTS Sedan (VIN A) built prior to September 23, 2013

• 2014 Corvette built prior to August 5, 2013

• 2014 Impala (VIN 1) (Fig. 9)

• 2014 Silverado 1500 built prior to October 1, 2013

• 2014 Sierra 1500 built prior to October 1, 2013


F09 Impala screen

Fig 9


Some possible Bluetooth conditions include the screen not returning to the Home screen after ending a call, cannot call contact work/mobile number for more than one contact with the same name, and issues concerning speech recognition.


Some navigation conditions include no results found after performing an address search with an incomplete address, the selection of a Point of Interest address delivers a wrong destination position, and the map freezing when panning in the 10k zoom scale.


An updated software calibration has been released to address these conditions.


Update the Human Machine Interface (HMI) module using a USB flash drive and the Service Programming System with the files available on TIS2Web.


TIP: The USB flash drive programming event requires a USB 2.0 flash drive with a minimum capacity requirement of 4 GB. The software downloaded to the USB flash drive can be used to update all applicable vehicles.


After USB programming has been completed, reprogram the HMI module using the Service Programming System with the latest calibrations available on TIS2Web and then clear any DTCs.


TIP: The vehicle modules must go to sleep for five minutes after programming the HMI module. If not, the vehicle may have a blank screen, no sound, no touch response, or the wrong splash screen may appear on the screen. If this happens, turn off the vehicle and wait the required five minutes before starting the vehicle again.


For RPO IO5, there was a production change in the software that changes the Navigation icon display to the Navigation OnStar icon display.


– Thanks to Ryan Dorland and Hassan Abdallah


HVAC Control Head Emergency Mode

The HVAC system on some 2006-2010 Pontiac Solstice and 2007-2010 Saturn Sky models may have a condition where the HVAC temperature setting will go to full hot when the temperature control is set one position from full cold. (Fig. 10) In this case, the control head may be defaulting to Emergency Mode, which provides hot air to clear the windshield in Defrost mode. This will occur if the feedback voltage for the air temperature actuators is out of range.


F10 Sky Climate Controls

Fig 10


Locally obtain a 60 to 68 ohm, 1/2 watt resistor, and install it in-line with circuit 1688, pin F of the HVAC control head. Install the resistor just behind the HVAC control head.


– Thanks to Matt Bierlein

Missing Audible Alert

The beep alert option on the Forward Collision Alert (FCA) system and/or the Rear Cross Traffic Alert (RCTA) system may be inoperable on some 2014 LaCrosse models equipped with Forward Collision Alert (RPO UEU), Rear Cross Traffic Alert (RPO UFG) and the Base Audio system (RPO U65). If the beep alert is selected for the Forward Collision Alert or Rear Cross Traffic Alert systems, the beep will not sound; however, a visual red flashing alert on the windshield remains active.


An updated software calibration has been released to address these conditions. Update the radio calibration using the Service Programming System and TIS2WEB.


– Thanks to Christopher Crumb


Supplement to High Feature V-6 Engine Timing Procedure

The following models offer the available high feature 3.6L V6 engine (RPO LY7, LLT, LFX, LF3), 2.8L V6 engine (RPO LP1) or 3.0L V6 engine (RPO LF1, LFW):


• 2013-2014 ATS, XTS

• 2012-2014 Impala

• 2012-2013 Caprice

• 2010-2014 Camaro, Terrain

• 2009-2014 Traverse

• 2008-2014 Enclave, Equinox

• 2008-2012 Malibu

• 2008-2010 Vue

• 2008-2009 Torrent

• 2007-2014 CTS, SRX, Acadia, Lacrosse (Allure – Canada only)

• 2007-2011 STS

• 2007-2010 Outlook

• 2007-2009 G6, Aura


The high feature V6 engine family features a camshaft drive system that consists of a primary timing drive chain driven by the crankshaft sprocket. The primary timing drive chain drives two intermediate drive shaft sprockets. Each intermediate drive shaft sprocket drives separate secondary timing drive chains, which drive the respective cylinder head’s intake and exhaust camshaft position actuators.


When timing the high feature V6, refer to the latest version of #PIP4384 for valuable supplemental information. It contains several pictures and other information that may be helpful when timing the engine. (Fig. 11) Consult the appropriate Service Information for complete timing procedure information.

 F11 2091921

Fig 11


TIP: For additional information, view video 10208.01D, January 2008 Emerging Issues, from the GM training website (U.S. only). In Canada, view Tech Assist video 16038.01W, Timing the High Feature 3.6L V6 Engine, on the training website and a related video in the GM GlobalConnect Service Library under Technician Resources >TAC Talk Video Help.


Before beginning the timing procedure, keep these items in mind:


• In a front-wheel-drive vehicle, it may be easier to remove the engine before beginning.

• When removing the front cover, be sure to remove the belt tensioner and all the bolts. Damage may occur to the block if this procedure is not followed.

• When removing the front cover, do not pry against or strike the cam actuators. This will cause damage to the reluctor or actuator.

• Intake cam actuators have marks on them for the Right Bank (R) and the Left Bank (L). They must be positioned respectively.

• Be sure to note the orientation of the injector wiring harness. The harness with connector should come out on the front side of the engine. If installed backwards it will cause misfires and/or fuel trim DTCs.

• 4-screw Delphi cam actuators and 5-screw Aisin cam actuators are interchangeable, but require the correct shim behind them when applicable. 4-screw Delphi actuators use a 0.043 in. shim and the 5-screw Aisin actuators use a 0.063 in. shim.


– Thanks to Aron Wilson

Speedometer Needle Accuracy

Owners of some 2003-2014 Escalade models, Silverado, Suburban, Tahoe, Sierra and Yukon models; and the 2003-2013 Avalanche may comment that their vehicle’s speedometer needle appears to be inaccurate. This may be noticed most often when comparing the speedometer to the optional digital speedometer readout displayed on the Driver Information Center. (Fig. 12)

F12 speedo

Fig 12

The speedometer needle is electrically operated by a stepper motor and there may be some variation in accuracy. Digital readout devices, such as the digital speedometer on the Driver Information Center, are direct readouts of the Vehicle Speed Sensor (VSS) and their accuracy is much greater. Tire size, tread life and inflation may cause some variation in the readings.

The specification for speedometer needle accuracy is +/– 2 MPH at any given speed when looking straight at the needle.


– Thanks to James Will

A New Era Begins with the 2014 Cadillac ELR

The 2014 Cadillac ELR (Fig. 1) is a sleek luxury coupe that features the first application of Extended Range Electric Vehicle (EREV) technology by a full-line luxury automotive brand.


2014 Cadillac ELR

Fig 1


EREV technology provides an EV range of approximately 37 miles (60 km) and a full driving range of approximately 340 miles (547 km) by combining pure electric driving and a range-extending 1.4L gas powered generator. Top speed is 106 mph (170 km/h). Uncompromising performance is delivered with 295 lb-ft of torque (400 Nm), more than the 3.6L V-6 in the SRX.




In the primary electric mode, the ELR is powered by its high voltage propulsion battery, until the battery is depleted to a predetermined level. After that, the ELR uses a range-extending 1.4L gas powered generator that produces enough energy to power it for hundreds of miles on a single tank of gas. Modes of operation are displayed on the center touch screen. (Fig. 2)


2014 Cadillac ELR

Fig 2


With colder outside temperatures, the energy needed to warm the vehicle’s cabin and high voltage propulsion battery can cause the vehicle’s electric range to decline.


The distance the ELR can be driven in primary electric mode is greatly affected by driving style. Observing the green Efficiency Gauge (Fig. 3) in the instrument cluster can minimize aggressive and inefficient acceleration or deceleration.


F03 ELR modern enhanced ic

Fig 3


Electric range is maximized at 50 mph (80 km/h) and below. Higher speeds use more energy and can significantly reduce electric range. Total vehicle range is based on the available combined electric and extended range.


TIP: The high voltage propulsion battery pack will not be recharged while in extended range mode. To recharge the battery pack completely, the vehicle must be plugged in.


Regenerative Braking


When the vehicle is coasting or braking, the power inverter module may operate the drive motor as a generator, exerting a driveline load that helps to slow the vehicle. The electrical energy that the drive motor creates is transferred by the power inverter module to the battery pack. Constant communication between the power inverter module and the Electronic Brake Control Module allows the blending of regenerative braking force with hydraulic braking force.


Regen on Demand


Regen on Demand will slow the vehicle by recapturing energy. It works in Drive and Low. To activate Regen on Demand, pull and hold either paddle on the back of the steering wheel without pressing the brake pedal or accelerator pedal. Regen on Demand is deactivated once the paddles are released, or the brake pedal or accelerator pedal is pressed. Cruise control will turn off, and the brake lights may turn on, when this feature is activated.


TIP: Regen on Demand will not stop the car.




The heart of the ELR’s electric propulsion system is its advanced Lithium-Ion Drive Motor Battery System. The hybrid battery contains 288 cells, organized into three battery sections, with a nominal system voltage of 355 V direct current.


The battery energy control module monitors the voltage of the battery cells through four hybrid battery interface control modules. The battery is liquid cooled for long life and optimum performance.


The high voltage battery is located beneath the vehicle. (Fig. 4) The battery energy control module, battery interface control modules 1-4, current sensor, and high voltage contactors are located within the battery assembly. The Powertrain Control Module 2 (the host controller for Diagnostic Trouble Code information) is located under the front passenger seat.


Detailed display of the 2014 Cadillac ELR propulsion system.

Fig 4


TIP: Before performing service, ensure all High Voltage Safety procedures and Warnings are followed exactly as written. Personal Protection Equipment (PPE) MUST be worn and proper procedures MUST be followed.


The Manual Service Disconnect (MSD) is located under the front floor console rear trim panel. Removing the rear trim panel will expose the MSD.


Drive Motor Battery Charging


The lithium-ion high voltage battery pack can be charged using the provided charging cord and a 120-volt standard outlet. Charge times will vary with outside temperature.


Charging Status Indicators are located on the instrument panel near the windshield and in the side mirrors (if activated).




The underhood gas powered electric generator is a 1.4L DOHC inline four cylinder engine that produces 83 HP (62 kW). Premium gasoline with a posted octane rating of 91 or higher is required.


Internal Combustion Engine (ICE) Starting


Instead of a 12 V starter motor, a much more powerful 300 V Drive Motor A, located within the transmission, is utilized to crank the engine. Drive Motor A can rotate the engine to operating speed of 800 RPM within just a few hundred milliseconds, allowing near-instant starting. The vehicle’s on-board computers determine when the engine needs to run:


  • The hybrid/EV battery pack has a low state of charge.
  • The hood is open or not completely latched.
  • The engine is needed to maintain the high voltage battery pack temperature.
  • The engine needs to run for maintenance.
  • Low ambient temperatures. At temperatures of 35°F (2°C) and colder, the engine can run to provide both electric power and heat to supplement the electric heater. This can happen regardless of battery charge level.


Service Mode


Service Mode is available for service and diagnostics and to verify the proper operation of the MIL and may be required for emission inspection purposes. With the vehicle off and the brake pedal not applied, pressing and holding the POWER button for more than 5 seconds will place the vehicle in Service Mode. The vehicle will not be able to be driven. The propulsion system will not start in Service Mode.




The 4ET50 (RPO MKA) is a fully automatic electronically controlled transmission. It consists primarily of a torque dampener assembly, an integral main and auxiliary fluid pump and housing, one planetary gear set, three clutch assemblies, a hydraulic pressurization and control system, and two internal electric motors. Drive motor generator A is 55 kW and drive motor generator B is 135 kW.


The planetary gear set provides the electrically variable forward mode ratios and reverse. The TCM and the drive motor generator power inverter module vary the torque output at the optimum time based on throttle position.


The main hydraulic system primarily consists of a gerotor-type pump, control valve body assemblies, dampener housing and case. A secondary auxiliary pump with electric three phase high voltage motor located inside the transmission maintains working pressures when the engine is off.




The 2014 ELR uses GM’s Global A electrical architecture. This architecture requires the use of the Global Diagnostic System 2 (GDS 2) software and the Multiple Diagnostic Interface (MDI) module.


AGM 12V Battery


The ELR uses an Absorbent Glass Mat (AGM) 12 V battery that requires different charging voltages than conventional lead acid batteries. The essential tool (GR-8) EL-50313 has this algorithm built in. Select AGM when prompted or damage to the battery will result.


The ELR uses the 12 V battery to wake up and initialize control modules. If the vehicle does not power up, verify that the 12 V battery is sufficiently charged to allow all of the control modules to wake up.


If the vehicle’s 12 V battery is weak or disconnected, the door handle touch pads and door latch buttons may not operate. The doors can be opened from the outside manually by opening the trunk with the door key and pulling the door release tab below the package shelf. (Fig. 5)


F05 ELR door release tab

Fig 5




Heating and Air Conditioning


The heating system uses a high voltage heater when the engine is not running and passenger compartment heat is requested. The HVAC control module monitors the temperature sensors in the passenger compartment, outside air, engine radiator, high voltage heater and the engine to determine the position of the coolant flow control valve and if the high voltage heater is needed.


The 300 V electric A/C compressor is a self contained high voltage inverter, electric motor, and direct coupled compressor. It can provide cooling even when the engine is not running. The pulse width modulated electric A/C compressor runs at a speed necessary to maintain a desired cooling level rather than cycling the compressor on and off.


At high ambient temperatures and high humidity, the driver may notice a unique high-pitched sound from the compressor when the vehicle is stopped or at low speeds. This is considered normal. The A/C compressor is serviced as a unit.


Normal Sounds


Due to the quiet nature of the ELR’s propulsion system, certain sounds that otherwise may have been masked will be apparent — the electric engine cooling fan, coolant pumps, the air conditioning compressor and the HVAC blower. The drive motor battery cooling system may be operational during charging or when the vehicle is powered down.


The electric motor may be heard as the vehicle moves. This is a normal operating characteristic.


ELR uses active noise cancelling at all engine speeds. It gathers input from the generator and powertrain, and from three ceiling-mounted microphones. The system produces a noise-cancelling signal through the audio system.


Hoist Contact Lift Points


A low profile lift arms system may be required to avoid unwanted contact with the vehicle’s body and structure depending on the lifting equipment being used. (Fig. 6) Refer to the hoist manufacturer’s recommendation.


F06 ELR proper lift point

Fig 6


Refer to #PI1141 for further details, including required service training courses and a list of special tools.


– Thanks to Chuck Wieseckel and Sherman Dixon

Charging the ELR

The 2014 Cadillac ELR with its Extended Range Electric Vehicle (EREV) technology provides an EV range of approximately 37 miles (60 km) and a full driving range of approximately 340 miles (547 km), by combining pure electric driving and its range-extending 1.4L gas powered generator.


The lithium-ion high voltage battery pack holds its charge efficiently and has no memory effect, so it doesn’t have to be run down completely before recharging. Keeping the vehicle plugged in, even when fully charged, will keep the battery temperature ready for the next drive.


Charging Time


The ELR can be programmed for three charging modes: Immediately upon plug-in; Delayed based on departure time; and Delayed based on electric rate and departure time.


Using a 120-volt standard outlet will take approximately 12.5 hours to charge the ELR at the 12-amp setting, or 18 hours at the 8-amp default setting. Using a 240-volt charging station will take approximately 5 hours. Charge times will vary with outside temperature.


TIP: Before plugging in to any electrical outlet, have a qualified electrician inspect and verify the electrical system (electrical outlet, wiring, junctions and protection devices) for heavy-duty service at a 12-amp continuous load.


Touch the green leaf Energy icon on the infotainment touch screen and then touch the Charging icon to view the current Charge Level and Charge Mode status. (Fig. 7)

• Touch the green Charge Level text to select a different charge level. • Touch the green Charge Mode text to select a different charge mode.


F07 ELR charging screen

Fig 7


Charging Status


Charging Status Indicators are located on the instrument panel near the windshield (Fig. 8) and in the side mirrors (if activated in the Vehicle Personalization menu). (Fig. 9)


Charging Status Indicators are located on the instrument panel near the windshield (Fig. 8) and in the side mirrors (if activated in the Vehicle Personalization menu). (Fig. 9)


On the instrument panel, the light indicators are:

Solid green with single horn chirp – Vehicle is plugged in; battery is charging

Slow (long pulse) flashing green with double horn chirp – Vehicle is plugged in; battery charging is delayed

Fast (short pulse) flashing green – Vehicle is plugged in; battery is fully charged

Solid yellow – Vehicle is plugged in; not charging

No light – Vehicle is not plugged in or there is an issue with the charger or outlet

No light and repetitive horn chirps – Electricity was interrupted before charging was completed


F08 ELR charging light

Fig 8


On the side mirror, the light indicators show the progress of the charging event. They are:

Solid green – Battery is charging; charging is less than half complete

Fast flashing green – Charging is more than half complete

Slow flashing green – Charging is nearly complete

No light – Charge is complete or not charging


F09 ELR charging side mirror

Fig 9



1. Place the vehicle in Park.

2. Select the Charging icon at the bottom of the Energy screen on the touch screen.

3. Review the selected Charge Level and Charge Mode. Touch the green text if an increased Charge Level or different Charge Mode is desired. The Charge Level selection automatically returns to the reduced level each time the vehicle is driven.

4. Once the Charge Level and Charge Mode are selected, turn off the vehicle.

5. Remove the charge cord from the trunk and plug it into an electrical outlet. DO NOT PLUG INTO AN EXTENSION CORD. The charge cord indicator on the base of the charge card should be green.



• Always properly support the charge cord at all times and do not let it hang from the plug or outlet.

• Electrical outlets may wear out with normal usage or be damaged over time, making them unsuitable for electric vehicle charging.

• Check the electrical outlet/plug while charging and discontinue use if the electrical outlet/plug is hot; have the electrical outlet serviced by a qualified electrician.


6. Press and release the rear edge of the charge port door, located just in front of the driver’s door, to open the door. Plug the charge cord into the charge port.


Once charging is complete, unplug the charge cord by pressing the plug release button on the cord, unplug the cord from the electrical outlet and properly stow the charge cord. (Fig. 10)


F10 ELR stowed charge cord

Fig 10


– Thanks to Keith Newbury and Sherman Dixon




Cold Weather EV Electric Range Tips

As temperatures fall, it’s important to remind Chevrolet Volt and Cadillac ELR owners that the electric range of their vehicle can be affected. During colder months, the energy needed to warm the vehicle’s cabin and high-voltage battery can cause the electric range to decline.


To help maximize electric vehicle (EV) electric range during cold weather, follow these tips. They can help Volt and ELR owners in all climates increase their vehicle’s efficiency.


Precondition while Plugged-In


Take advantage of the power of the grid to heat the cabin and the high-voltage battery prior to driving. The Volt and ELR can be remote started several ways while plugged in, including using the key fob (Fig. 11) or the OnStar RemoteLink app available on compatible smartphones and tablets.


F11 key fob

Fig 11

Using energy from the grid to warm the cabin enables the stored battery energy to be reserved for driving. Maximum benefit is provided when using a 240V charger.


Keeping Warm on the Road


To maximize electric range, set the climate mode setting from Comfort to Eco (Fig. 12) to help reduce the energy used to heat the cabin. If equipped, use the automatic heated seats to keep warm. The heated seats use less energy than heating the entire cabin.


F12 climate control screen

Fig 12


Check Tire Pressures


As the outside temperature drops, the air pressure in the tires drops as well. Check the tire pressure and add more air if needed to maintain the tire pressures at the recommended level. Recommended tire pressure is on the Tire and Loading Information label inside the driver’s door opening. Properly inflated tires can help improve electric range and fuel economy.


Engine-Assisted Heating (2013/2014 Volt Only)


This feature enables owners to select the outside temperature level at which the gas-powered generator will run to assist heating while driving in Electric Mode. To change the settings, go to Climate and Air Quality in the Vehicle Settings menu.


The Engine-Assisted Heating options are:

• At Cold Outside Temperatures, below approximately 35°F (2°C). This selection maximizes the battery range and uses a very small amount of gasoline to help power the vehicle during cold temperatures.

• At Very Cold Outside Temperatures, below approximately 15°F (−10°C). This selection uses less gasoline, but has a larger adverse impact on battery range.


Three T’s to Maximize Electric Range


Remind customers of the three T’s to maximizing electric range.


Temperature – Cold weather will adversely impact electric range, but efficient use of the climate system and pre-warming the vehicle while it is plugged in can help reduce the effect of cold outside temperatures on electric range.


Terrain – Going up and down hills is less efficient than driving on flat surfaces. Where possible, avoid hilly routes to maximize electric range.


Technique – Aggressive acceleration and deceleration are not as efficient as smooth, easy starts and stops. Use the efficiency gauge in the instrument cluster to help drive more efficiently.


– Thanks to Keith Newbury


Updated February 28, 2014

Tire Noise Diagnosis

If owners comment about noise related to the tires on their vehicle, there are many factors to consider when performing diagnosis. For example, the amount of tire noise may be due to the tire design, a change from one tire brand to another, or vary based on road speed and road surfaces.


A tire with an aggressive tread design will tend to be the most noisy. So winter tires often will be more noisy than all-season tires, which have a tendency to be noisier than summer only tires. This is because of the more aggressive tread that is designed to work well on ice and snow covered roads. Different tires also may be noisier on some surfaces than others.


In addition, larger diameter tires with shorter sidewalls (Fig. 13), popular on many new models today, also may tend to be perceived as noisy, especially when compared with a previous vehicle with smaller tires.


2014 Buick Regal GS

Fig 13


Compare Tires


Before tires are replaced for a noise condition, they should be compared with a like vehicle with the same tire brand and model to see if there is any other reason for the noise level in the vehicle. If the vehicle with the tire noise concern is similar to other like vehicles, the tires should not be replaced. Under no circumstances should tires ever be replaced for noise levels that are consistent from one vehicle to another. Also, a summer only tire should never be used as a replacement tire to address a noise concern on a vehicle equipped with all-season tires. This can create undesirable handling conditions in icy or snowy weather.


Match TPC Specs


A second consideration when diagnosing tire noise is the use of aftermarket tires that do not meet the GM Tire Performance Criteria (TPC) specification marked on the original equipment tires. The tires on all new production models have a TPC rating number molded on the sidewall. The TPC rating will appear as a 4-digit number preceded by the letters TPC SPEC on the tire wall near the tire size. (Fig. 14)


2014 GMC Sierra Denali 20-inch Chrome Wheels

Fig 14


Non-TPC marked tires may have been installed by the owner or a used vehicle department. The tread noise of the tires is taken into consideration as part of the engineering development and validation of GM vehicles. If the tire performance is changed with the installation of non-TPC aftermarket tires, noise levels may increase considerably.


If tire noise is noticed in a vehicle that has a replacement tire installed, another set of tires and wheels from a similar vehicle should be installed to rule out the tires as a source of noise. Noises from some tread designs may sound remarkably similar to wheel bearings or driveline components, especially at lower speeds and with the HVAC and infotainment systems turned off.


A replacement tire should have the same TPC specification number as the original equipment tire. This will ensure the same size, the same load range, and the same construction as those originally installed on the vehicle.


After diagnosis, if a customer is not satisfied with what is considered to be a normal tire noise level when compared with like vehicles, the customer’s concern should be reviewed with the local DM-Aftersales.


– Thanks to David MacGillis



Instrument Cluster Not Displaying Radio or Phone Data

The Instrument Panel Cluster on some 2014 Lacrosse models built before December 19, 2013 and 2014 Regal models built before January 21, 2014 may not display radio or phone data. (Fig. 15) An Audio Off message may be displayed on the Driver Information Center and the right audio steering wheel controls may be inoperative. In addition, the instrument cluster may intermittently display “Sport” mode and other personalization features may return to the factory default setting.

 F15 Regal DIC Radio

Fig 15


These instrument cluster conditions may be the result of a reset condition within the Instrument Panel Cluster.


New Instrument Panel Cluster software has been released to address these conditions. Use TIS2Web to update the Instrument Panel Cluster calibrations and confirm proper operation.


TIP: The updated software only applies to vehicles built before the listed build dates if audio is still present, the radio controls still function, and no current infotainment DTCs are set.


– Thanks to Christopher Crumb

Climate Control and Heated/Cooled Seat Operation during a Remote Start

The following systems on the 2014 Silverado 1500 and Sierra 1500 may operate during a remote vehicle start:

• Climate controls • Rear window defogger • Heated seats • Cooled seats • Heated steering wheel


Climate Control (HVAC) Settings


During a remote start, the HVAC settings will operate at the previous HVAC settings when the vehicle was last turned off. If the owner desires a certain HVAC setting during a remote start, the HVAC mode, blower and temperature should be set prior to turning off the truck.


Rear Window Defogger


During a remote start, the rear window defogger will turn on if the outside temperature is 44° F (7° C) or below. It will stay on for 10 minutes when the key is turned to Run/On. The rear window defogger indicator will not be illuminated until the key is turned to Run/On.


Heated Seats


During a remote start, the heated seats will turn on (if enabled) to the high setting when the ambient temperature is below 50° F (10° C). They will turn off when the key is turned to Run/On. The heated seat indicators will not be illuminated when the heated seats are on during a remote start. To enable the heated seats to operate during a remote start, go to the Vehicle Settings menu. (Fig. 16)


F16 vehicle setting menu

Fig 16


Cooled Seats


During a remote start, the cooled seats will turn on (if enabled) to the high setting when the ambient temperature is above 80° F (27° C). They will turn off when the key is turned to Run/On. The cooled seat indicators will not be illuminated when the cooled seats are on during a remote start. To enable the cooled seats to operate during a remote start, go to the Vehicle Settings menu.


Heated Steering Wheel


During a remote start the heated steering wheel does not turn on.


– Thanks to Jim Will


DTC P0300 Setting after Engine Repairs

DTC P0300 (Engine Misfire Detected) may set after performing engine repairs on the following vehicles equipped with a V8 engine:

• 2004-2007 Rainier

• 2008-2009 LaCrosse, Allure (Canada Only)

• 2006-2013 CTS-V

• 2002-2013 Escalade

• 2010-2013 Camaro

• 2011-2013 Caprice PPV

• 2002-2013 Avalanche

• 1999-2013 Express, Silverado, Suburban, Tahoe, Savana, Sierra, Yukon

• 2002-2014 Silverado HD, Sierra HD

• 2009-2013 Colorado, Canyon

• 2003-2009 Trailblazer, Envoy

• 2006-2009 Impala SS

• 2006-2007 Monte Carlo SS

• 2003-2006 SSR

• 2005-2013 Corvette

• 2003-2010 Hummer H2

• 2008-2010 Hummer H3

• 2008-2010 G8

• 2005-2006 GTO

• 2005-2008 Grand Prix GXP

• 2005-2009 Saab 97X


It is possible to have the fuel injector electrical connectors crossed for cylinders 5-7 and 6-8, which may cause an engine misfire. The engine misfire may not be detected and may happen during deceleration.


If crossed injector connectors may be a possible cause, follow the appropriate Service Information to validate the injector connector routing. (Fig. 17) If necessary, correct the injector connector routing and evaluate for proper operation.


F17 injector routing 1

Fig 17


– Thanks to Richard Renshaw


Passenger Air Bag and Safety Belt Indicator Information

Owners of some 2007-2013 Silverado and Sierra; 2014 Silverado 2500/3500 and Sierra 2500/3500; and 2008-2009 Hummer H2 models may question if their vehicle should have the following options:


• Passenger Presence System (PPS)

• Passenger air bag On/Off indicators

• Passenger air bag On/Off switch

• Passenger safety belt indicator


This information does not apply to the new 2014 Silverado 1500 and Sierra 1500.


The following information outlines the content of each model.


1500 All Models


• Passenger Presence System (PPS) = YES, standard equipment (RPO AL0)

• Passenger air bag On/Off indicators = YES, located in the overhead console

• Passenger air bag On/Off switch = NO

• Passenger safety belt indicator = YES, located in the overhead console


2500/3500 Regular and Extended Cab Models


• Passenger Presence System (PPS) = NO, Not available

• Passenger air bag On/Off indicators = YES, located in the overhead console

• Passenger air bag On/Off switch = YES, located in the lower glove box (RPO C99)

• Passenger safety belt indicator = NO


2500/3500 Crew Cab Models


• Passenger Presence System (PPS) = NO, Not available

• Passenger air bag On/Off indicators = NO

• Passenger air bag On/Off switch = NO, Not available

• Passenger safety belt indicator = NO


Hummer H2


• Passenger Presence System (PPS) = NO, Not available

• Passenger air bag On/Off indicators = YES, located in the overhead console

• Passenger air bag On/Off switch = YES, located in the lower glove box (RPO C99)

• Passenger safety belt indicator = NO


– Thanks to Scott Fribranz


Service Know-How

10214.01D – Emerging Issues

January 10, 2013


To view Emerging Issues seminars:

• Log in to

–   Select Resources, and then Video on Demand; or

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


Car Issues – Fix It Right the First Time


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Truck Issues – Fix It Right the First Time


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