GLOBAL SAFETY FIELD INVESTIGATIONS
DCS6006
URGENT - DISTRIBUTE IMMEDIATELY
Date:

December 16, 2021

Subject: REVISION – N212345750-01 - Service Update
High Voltage Battery Software Update
Revised vehicle population added.
Models: 2017-2019 Chevrolet Bolt EV
To:

All General Motors Dealers

This bulletin has been revised to include certain 2017-2018 model year
vehicles. Please discard all previous copies of bulletin N212345750.

END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS

Service Update
N212345750 High Voltage Battery Software Update
Release Date:
Revision Description:
Attention:

December 2021
Revision: 01
This bulletin has been revised to include certain 2017-2018 model year vehicles. Please
discard all previous copies of bulletin N212345750.

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 -specific training, tool and equipment requirements. Repairs must be performed by a
technician who has successfully completed the required training.

Make
Chevrolet

Model
Bolt EV

Model Year
From
To
2017
2019

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 2017-2019 model year Chevrolet Bolt EV vehicles that were repaired under Safety Recall
N212343881 prior to the release of the Advanced Diagnostic Software package may have a condition
where they could experience an inrush of current causing diagnostic trouble code (DTC) P0AA1 to set,
which could result in a malfunction indicator light (check engine light) illuminating on the instrument
cluster.
There is no safety issue associated with this condition.
Dealers will reprogram modules using the ZFA – Field Action Multimodule Coordinated Sequence on
vehicles that were repaired under Safety Recall N212343881 with a new high voltage (HV) battery pack.
These vehicles did not receive the “Advanced Diagnostic Software” programming under N212343881 or
N212343883, and are receiving it under this field action.

Parts
No Parts Required
Warranty Information
Labor
Operation
9105954

Description
ZFA – Field Action Multimodule Coordinated Sequence

Labor
Time
0.7

Trans.
Type
ZFAT

Net
Item
N/A

Service Procedure

Important: If the customer brought in the vehicle for an illuminated MIL (Service Vehicle Soon light), check to
see if DTC P0AA1 has a DTC History Status of “History” in the HPCM2. If yes, then the High Voltage Battery
Disconnect Relay should be replaced because it is damaged. Refer to SI document ID 4508101 to replace the
High Voltage Battery Disconnect Relay. Complete the programming below and return the vehicle to the
customer. If parts are required, the customer can be notified that a follow up service will be arranged once the
parts are available. If the High Voltage Battery Disconnect Relay requires replacement , parts and labor should be
charged to the 8 year/100,000-mile (160,000 km) warranty and NOT to this field action.
Programming
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.

Copyright 2021 General Motors. All Rights Reserved.

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Service Update
N212345750 High Voltage Battery Software Update
•

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.

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

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Service Update
N212345750 High Voltage Battery Software Update

5644477

5431207

Important:

Techline Connect and TIS2WEB screens shown above.

Important:
If the same calibration/software warning is noted on the TLC or SPS 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.

5644478

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Service Update
N212345750 High Voltage Battery Software Update

5431209

Note: The screenshots above are 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.
1.

Reprogram the sequential multiple modules through SPS/Techline Connect (SPS and Techline Connect screens
shown) by selecting “ZFA – Field Action Multimodule Coordinated Sequence” on the select controller screen and
select “Programming” for the Select Function/Sequence”. Select “Next” and follow all on screen instructions. In
SPS, scroll down to view all instructions prior to programming.

5924567

Note: The first module in the sequence is the K114B HPCM2 which is programmed with Ignition OFF and the brake
pedal depressed to keep communications awake. The second module in the sequence is the K16 BECM, which is
programmed with Ignition ON/Propulsion OFF. The third module is the K9 BCM is also programmed with Ignition
ON/Propulsion OFF.
Note: Failure to make the transition to Ignition ON/Propulsion OFF may result in having to restart the sequential
programming. Sequential programming may SKIP some modules if they already have the latest available calibration.

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Service Update
N212345750 High Voltage Battery Software Update
2.

Remain in the vehicle with the brake pedal depressed during the programming of the K114B HPCM2. When the
green check mark indicates the K114B HPCM2 has been re-programmed, as shown in the image, release the brake
pedal and transition to Ignition ON/Propulsion OFF.

3.

After programming has fully completed, clear DTCs. Let the vehicle sleep for 1 minute after removing the MDI,
powering OFF, and closing all doors.

Dealer Responsibility
Whenever a vehicle subject to this service update enters your vehicle inventory or is in your facility for service in the
future, 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 Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers' possession
and subject to this bulletin 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 Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System
(CPOIS) 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 CPOIS system, or once again be used in the CTP program.
Dealer Reports
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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