A222379711

GLOBAL SAFETY FIELD INVESTIGATIONS
DCS6823
URGENT - DISTRIBUTE IMMEDIATELY
Date:
March 14, 2024
Subject: A222379711 - Emission Recall
DTC P0521 Permanent Status Not Properly Cleared
Models: 2020-2023 Buick Encore GX
2021-2023 Chevrolet Trailblazer
To:
All General Motors Dealers
General Motors is releasing Emission Recall A222379711 today. The total
number of U.S. vehicles involved is 10,480. Please see the attached bulletin
for details.
Global Warranty Management (GWM)
The Required Field Action section on the Investigate Vehicle History (IVH) screen has
been updated. Please verify a VIN's involvement by checking in IVH. IVH is the best
source for individual VIN inquiries. A list of vehicles in dealer inventory is attached to
this message.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS
Emission Recall
A222379711 DTC P0521 Permanent Status Not Properly Cleared
Release Date:
Attention:
March 2024
Revision:
00
All involved vehicles in the US and Canada that are in dealer inventory must be held and not delivered
to customers, dealer traded, or used for demonstration purposes until the repair contained in this bulletin
has been performed on the vehicle.
Make
Model
Buick
Chevrolet
Encore GX
Trailblazer
Model Year
From
To
2020
2023
2021
2023
RPO
Description
Involved vehicles are marked “Open” on the Investigate Vehicle History screen in GM Global Warranty Management
system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections
and/or repairs.
Condition
Correction
General Motors has decided to conduct a Voluntary Emission Recall involving certain 2020-2023
Chevrolet Trailblazer and Buick Encore GX vehicles. The Engine Control Module (ECM) may not clear
the permanent status of DTC P0521 (Engine Oil Pressure Sensor Performance). If the ECM had
previously set a DTC P0521 and the permanent status is not properly cleared, the vehicle may not
pass certain Emissions Inspection/Maintenance (I/M) tests.
Dealers are to reprogram the ECM.
Parts
No parts are required for this repair.
Warranty Information
Labor
Operation
9107147*
9107148*
Description
Verified Module Software or Calibration Level: Module Is
Programmed with Same Level Software or Calibration
Engine Control Module Reprogramming with SPS
Labor
Time
0.2
Trans.
Type
ZFAT
Net
Item
N/A
0.3
ZFAT
N/A
Important: * To avoid warranty transaction rejections, carefully read and follow the instructions below:
6125814
•
The Warranty Claim Code from the programming event must be accurately entered in the “Warranty Claim Code”
field of the transaction.
•
When more than one Warranty Claim Code is generated for a programming event, it is required to document all
Warranty Claim Codes in the “Correction” field on the job card. Dealers must also enter one of the codes in the
“Warranty Claim Code” field of the transaction, otherwise the transaction will reject. It is best practice to enter the
FINAL code provided by SPS2.
Copyright 2024 General Motors. All Rights Reserved.
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Emission Recall
A222379711 DTC P0521 Permanent Status Not Properly Cleared
Warranty Claim Code Information Retrieval
6125774
If the Warranty Claim Code was not recorded on the Job Card, the code can be retrieved in the SPS2 system as
follows:
1.
2.
3.
4.
Open TLC on the computer used to program the vehicle.
Select and start SPS2.
Select Settings (1).
Select the Warranty Claim Code tab (2).
The VIN, Warranty Claim Code and Date/Time will be listed on a roster of recent programming events. If the code is
retrievable, dealers should resubmit the transaction making sure to include the code in the SPS Warranty Claim Code
field.
Service Procedure
Note: Carefully read and follow the instructions below.
•
Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector.
If there is an interruption during programming, programming failure or control module damage may occur.
•
Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will
interrupt programming. Install a GM Authorized Programming Support Tool to maintain system voltage. Refer to
www.gmdesolutions.com for further information. If not available, connect a fully charged 12 V jumper or booster
pack disconnected from the AC voltage supply. DO NOT connect a battery charger.
•
Follow the on-screen prompts regarding ignition power mode, but ensure that anything that drains excessive power
(exterior lights, HVAC blower motor, etc) is off.
•
Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M)
system status indicators to NO.
Important: The service technician always needs to verify that the VIN displayed in the TLC left side drop down menu and
the top center window match the VIN plate of the vehicle to be programmed prior to using Service Programming System
2 (SPS2) for programming or reprogramming a module.
•
For the TLC application, service technicians need to always ensure that the power mode (ignition) is “ON” before
reading the VIN from the vehicle’s VIN master module and that they do not select a VIN that is already in the TLC
application memory from a previous vehicle.
•
If the VIN that shows up in the TLC top center window after correctly reading the VIN from the vehicle does not match
the VIN plate of the vehicle, manually type in the VIN characters from the vehicle VIN plate into the TLC top center
window and use these for programming or reprogramming the subject module with the correct vehicle VIN and
software and/or calibrations.
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Emission Recall
A222379711 DTC P0521 Permanent Status Not Properly Cleared
•
The Engine Control Module (ECM) is the master module (for VIP vehicles) that TLC reads to determine the VIN of
the vehicle. If the VIN read from the vehicle by TLC does not match the VIN plate of the vehicle, the ECM also needs
to be reprogrammed with the correct VIN, software and calibrations that match the vehicle’s VIN plate.
•
The Body Control Module (BCM) is the master module (for GEM vehicles) that TLC reads to determine the VIN of
the vehicle. If the VIN read from the vehicle by TLC does not match the VIN plate of the vehicle, the BCM also needs
to be reprogrammed with the correct VIN, software and calibrations that match the vehicle’s VIN plate.
Caution: Be sure the VIN selected in the drop-down menu (1) is the same as the vehicle connected (2) before beginning
programming.
5743643
Important: If the vehicle VIN DOES NOT match, the message below will be shown.
5877000
5644477
Important: Techline Connect screens shown above.
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Emission Recall
A222379711 DTC P0521 Permanent Status Not Properly Cleared
Important: If the same calibration/software warning is noted on the TLC Summary screen, select OK and follow screen
instructions. After a successful programming event, the WCC is located in the Service Programming System dialogue box
of the SPS Summary screen. No further action is required. Refer to the Warranty section of the bulletin.
1.
Reprogram the Engine Control Module. Refer to K20 Engine Control Module: Programming and Setup in SI.
5644478
Note: The screenshot above is an example of module programming and may not be indicative of the specific module that
is being programmed. Module selection and VIN information have been blacked out.
Important: To avoid warranty transaction rejections, you MUST record the warranty claim code provided on the Warranty
Claim Code (WCC) screen shown above on the job card. Refer to callout 1 above for the location of the WCC on the
screen.
2.
Record SPS Warranty Claim Code on job card for warranty transaction submission.
3. CALIFORNIA, COLORADO, CONNECTICUT, DELAWARE, MAINE, MARYLAND, MASSACHUSETTS, NEW
JERSEY, NEW YORK, OREGON, RHODE ISLAND, VERMONT, WASHINGTON VEHICLES ONLY: Install a
Recall Identification Label upon recall completion. See General Motors Service Policies and Procedures Manual,
Recall Identification Label, for details.
4.
CALIFORNIA VEHICLES ONLY: Complete a “Proof of Correction” certificate and provide to the vehicle owner upon
recall completion. For the recall number on the “Proof of Correction” certificate, enter only the six digits in
characters 4-9 of this recall bulletin number: 237971.
Dealer Responsibility
All new, used, GM Certified Pre-Owned (CPO), courtesy transportation vehicles, dealer shuttle vehicles, CarBravo, etc.
in dealers' possession and subject to this recall must be held and inspected/repaired per the service procedure of this
bulletin before customers take possession of these vehicles. Involved vehicles must be held and not delivered to
customers, dealer-traded, released to auction, used for demonstration, or any other purpose.
All GM Certified Pre-Owned (CPO) vehicles currently in the dealers’ inventory within the SHIFT Digital system will be
de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting an accepted/paid
warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified for sale within
the SHIFT Digital system, or once again be used in the Courtesy Transportation Program.
Dealers are to service all vehicles subject to this recall at no charge to customers, regardless of mileage, age of vehicle,
or ownership, from this time forward.
Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer
information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the
required correction according to the instructions contained in this bulletin. A copy of the customer letter is provided in this
bulletin for your use in contacting customers. Recall follow-up cards should not be used for this purpose, since the
customer may not as yet have received the notification letter.
In summary, whenever a vehicle subject to this recall enters your vehicle inventory you must take the steps necessary to
ensure the program correction has been made before selling the vehicle. In addition, for vehicles entering your facility for
service, you are required to ensure the customer is aware of the open recall and make every reasonable effort to
implement the program correction as set forth in this bulletin prior to releasing the vehicle.
***THE FOLLOWING 2 PARAGRAPHS ARE NOT FOR CANADA OR EXPORT***
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Emission Recall
A222379711 DTC P0521 Permanent Status Not Properly Cleared
When a California emissions recall is completed by a GM dealer, the dealer must provide the vehicle owner a “Proof of
Correction Certificate” which the owner may need to present to the California Department of Motor Vehicles (DMV) when
renewing their vehicle registration. Without this correction certificate, the owner may be unable to renew their vehicle
registration.
Additional Certificates can be obtained, at no charge, from the 1Store application in GlobalConnect. Request GM Item
Number 1825 when ordering.
Dealer Reports – For USA & Export
For dealers with involved vehicles, a listing has been prepared and will be available through GM GlobalConnect Maxis
Field Action Reports or sent directly to export dealers. The Inventory tab of the dealer reports will contain VINs that
apply to this recall. This information is intended to assist dealers with the PROMPT COMPLETION of these
vehicles. The Customer In-Service tab will contain customer names and addresses from Motor Vehicle Registration
Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete
this recall may be a violation of law in several states.
Courtesy Transportation – For USA & Canada
Courtesy transportation is available for customers whose vehicles are involved in a product program and still within the
warranty coverage period. See General Motors Service Policies and Procedures Manual for courtesy transportation
program details.
Customer Notification
USA & Canada - General Motors will notify customers of this recall on their vehicle (see copy of customer letter included
with this bulletin).
In order to ensure full protection under the emission warranty, and the right to participate in future recalls, the customer
notification letter recommends that customers have their vehicles serviced as soon as possible. It also advises that failure
to do so could legally be determined to be lack of proper maintenance. The vehicle may fail a state or local emission
inspection test if the recall work is not completed.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these 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 tools, equipment, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT
assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your dealer for information on whether your
vehicle may benefit from the information.
We Support
Voluntary Technician
Certification
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Emission Recall
A222379711 DTC P0521 Permanent Status Not Properly Cleared
April 2024
This notice applies to your vehicle, VIN: _____________________________________
Dear General Motors Customer:
This notice is sent to inform you that General Motors is conducting a voluntary emission recall that includes your
vehicle.
Reason For This Recall: Your 2020-2023 model year Buick Encore GX or 2021-2023 model year Chevrolet
Trailblazer vehicle may be equipped with an improperly functioning on-board emission-related diagnostic system that
violates California and Federal standards and regulations. The Engine Control Module (ECM) may not properly clear
certain diagnostic trouble codes. If these are not properly cleared, the vehicle may not pass certain emissions tests,
even if the Malfunction Indicator Lamp (Check Engine Light) isn’t on.
What Will Be Done: Your GM dealer will reprogram the engine control module. This service will be performed for you
at no charge. Eligibility for this service will not be denied solely due to your 2020-2023 model year Buick Encore GX or
2021-2023 model year Chevrolet Trailblazer vehicle having non-GM parts or repairs performed by outlets other than a
GM franchised dealer.
How Long Will The Repair Take? Because of service scheduling requirements, it is likely that your dealer will need
your vehicle longer than the actual service correction time of approximately 30 minutes.
What You Should Do: Please contact your GM dealer as soon as possible to arrange a service date. Instructions for
making this correction have been sent to your dealer. Please ask your dealer if you wish to know how much time will be
needed to schedule, process, and repair your vehicle.
If you have any questions or need any assistance, just contact your dealer or the appropriate Customer Assistance
Center at the number listed below.
For the hearing or speech impaired, please contact our Customer Assistance Center using the Telecommunication
Relay Service by dialing 711 then providing the appropriate Customer Assistance Center number for your vehicle.
Division
Buick
Chevrolet
Puerto Rico – English
Puerto Rico – Español
Virgin Islands
Number
1-800-521-7300
1-800-222-1020
1-866-467-9700
1-866-467-9700
1-866-467-9700
Text Telephones (TTY)
711 / 1-800-833-2438
711 / 1-800-833-2438
Emission Law Information: In order to ensure your full protection under the emission warranty made applicable to
your vehicle by state and federal law, and your right to participate in future recalls, it is recommended that you have
your vehicle serviced as soon as possible. Failure to do so could legally be determined to be lack of proper
maintenance of your vehicle. Also, your vehicle may fail a state or local emission inspection if this recall is not
accomplished.
IMPORTANT MESSAGE FOR CALIFORNIA RESIDENTS
The California Air Resources Board (CARB) requires vehicle emission recalls be completed prior to California
registration renewal. Uncorrected emission recalls will result in the inability to renew your California vehicle registration.
At the time of emission recall completion, your California dealer will issue a "Proof of Correction Certificate". Keep this
certificate and, if required, present it to the Department of Motor Vehicles when renewing your California registration as
proof of recall completion.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued
satisfaction with our products.
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Emission Recall
A222379711 DTC P0521 Permanent Status Not Properly Cleared
Regina A. Carto
Vice President
Global Product Safety and Systems
GM Recall: A222379711
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