GLOBAL SAFETY FIELD INVESTIGATIONS
DCS6718
URGENT - DISTRIBUTE IMMEDIATELY
Date:

November 14, 2023

Subject: REVISION: N232421260-01 – Service Update
False DTC Causing Unnecessary Battery Pack Replacements
Revised Service Procedure
Models: 2020 – 2022 Chevrolet Bolt EV
2022 Chevrolet Bolt EUV
To:

All General Motors Dealers

Bulletin N232421260 has been revised to update the service procedure. Please
discard all previous copies of bulletin N232421260.

END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS

Service Update
N232421260 False DTC Causing Unnecessary Battery Pack
Replacements
Release Date:
Revision Description:
Attention:

November 2023

Revision:

01

This bulletin is being revised to update the service procedure. Please discard all
previous copies of bulletin N232421260.

This service update includes vehicles in dealer inventory and customer vehicles that return to the
dealership for any reason.
This field action must only be completed by Chevrolet EV certified dealers who have met all Bolt field
action-specific training, tool and equipment requirements, and repairs must be performed by a technician
who has successfully completed the required training.
For Canadian Dealers: Only Chevrolet Dealers who have signed the Chevrolet Electric Models
Agreement and have met all the Chevrolet Bolt EV/EUV - specific training, tools, and equipment
requirements are eligible to complete the repair. Any Dealer unsure of their eligibility status should
immediately review with their District Service Manager.

Make
Chevrolet
Chevrolet

Model
Bolt EV
Bolt EUV

Model Year
From
To
2020
2022
2022
2022

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

Certain 2020 – 2022 model year Chevrolet Bolt EV and 2022 model year Chevrolet Bolt EUV vehicles
may have a condition in which a false diagnostic trouble code (DTC), U3636 symptom 09, is triggered.
This false DTC is resulting in customers experiencing a Malfunction Indicator Lamp (MIL) illuminated in
the Driver Information Center (DIC), a Reduced Propulsion message, and a charging limited to 30%
State of Charge. Since this is a false DTC, it can lead to unnecessary battery pack replacements.
Dealers are to reprogram the Hybrid Powertrain Control Module 2.

Parts
No parts are required for this repair.
Warranty Information
Labor
Operation
9106881*
9106882*
Important:

Description
Verified Module Software or Calibration Level: Module Is
Programmed with Same Level Software or Calibration
Hybrid Powertrain Control Module 2 Reprogramming with SPS

Labor
Time
0.2

Trans.
Type

Net
Item

ZFAT

N/A

0.4

* 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

Copyright 2023 General Motors. All Rights Reserved.

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Service Update
N232421260 False DTC Causing Unnecessary Battery Pack
Replacements
“Warranty Claim Code” field of the transaction, otherwise the transaction will reject. It is best practice to enter
the FINAL code provided by SPS2.
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
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Service Update
N232421260 False DTC Causing Unnecessary Battery Pack
Replacements
window and use these for programming or reprogramming the subject module with the correct vehicle VIN and
software and/or calibrations.

•

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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Service Update
N232421260 False DTC Causing Unnecessary Battery Pack
Replacements
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.

If DTC U3636 Symptom 09 is set current or in history, refer to Technical Service Bulletin #23-NA-157 before
proceeding with this field action. If DTC U3636 Symptom 09 is NOT set, proceed to step 2.

2.

Reprogram the Hybrid/EV Powertrain Control Module 2. Refer to K114B Hybrid/EV Powertrain Control Module 2:
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.
3.

Record SPS Warranty Claim Code on job card for warranty transaction submission.

Dealer Responsibility
Whenever a vehicle subject to this service update enters your vehicle inventory or is in your facility for service, you must
take the steps necessary to be sure the service update correction has been made before selling or releasing the vehicle.
All new, used, GM Certified Pre-Owned (CPO), courtesy transportation vehicles, dealer shuttle vehicles, CarBravo, etc.
in dealers' possession and subject to this field action 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.
Dealer Reports – For USA & Export
The Inventory tab of the Open Vehicle Report will contain Service Update Bulletin VINs that apply to this field action.
This information is intended to assist dealers with the PROMPT COMPLETION of these vehicles. The Customer InService tab will not contain Service Update Bulletin VIN data because the intent of a Service Update Bulletin is to not
inconvenience a customer with a special trip for service. Service Update Bulletins are to be completed when the
customer is in for a regularly scheduled visit.

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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