Customer Satisfaction Program
18125 Loss of Propulsion High Voltage Battery Without Notification
Reference Number:
Revision Description:
Attention:

N172127150

Release Date: August 2018
Revision: 01
This bulletin has been revised to add a step in the service procedure. Please discard
all copies of 18125.

This program is in effect until May 31, 2020.

Make
Chevrolet

Model
Bolt EV

Model Year
From
To
2017
2017
2018
2018

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 2017-2018 model year Bolt EV vehicles may have a condition where the software will not detect
the difference in the state of charge between the cell groups of the battery and over predict the indicated
battery range. The current software may not provide sufficient warning prior to a battery cell low range
condition, which may result in a loss of propulsion. Only certain vehicles will experience the battery low
voltage cell condition.
Reprogram hybrid powertrain control module 2.

Parts
No parts are required for this repair.
Warranty Information
Labor
Operation
9103690*
9103790**

Description
Hybrid Powertrain Control Module 2 Reprogramming with SPS
Module Programming Not Required

Labor
Time
0.4
0.2

Trans.
Type
ZFAT
ZFAT

Net
Item
N/A
N/A

* To avoid warranty transaction rejections, the SPS Warranty Claim Code(s) must be entered when submitting this
transaction.
** SPS Warranty Claim Code is NOT required when submitting this transaction.
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. When required install a GM Authorized Programming Support Tool to maintain system
voltage. Refer https://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.

•

Turn OFF or disable systems that may put a load on the vehicles battery such as; interior lights, exterior lights
(including daytime running lights), HVAC, radio, etc.

•

Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M)
system status indicators to NO.

•

If the Same Calibration/Software Warning is noted on the SPS Controller screen, do NOT attempt to program the
module. No further action is required. Refer to the Warranty section of the bulletin and use labor operation code
9103790, Module Programming Not Required.

1.

Reprogram the Hybrid Powertrain Control Module 2. Refer to Hybrid Powertrain Control Module 2 Programming and
Setup in SI.

2.

With a scan tool, perform the Hybrid/EV Battery Pack Capacity Learn and follow the on-screen instructions.

3.

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

Copyright 2018 General Motors. All Rights Reserved.

Page 1 of 3

Customer Satisfaction Program
18125 Loss of Propulsion High Voltage Battery Without Notification
Dealer Responsibility
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers' possession
and subject to this program 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, dealertraded, 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.
Dealers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle,
or ownership, through May 31, 2020. Customers who have recently purchased vehicles sold from your vehicle inventory,
and for which there is no customer information indicated on the involved vehicle 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. Program 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 program enters your vehicle inventory, or is in your facility for service
through May 31, 2020, you must take the steps necessary to be sure the program correction has been made before
selling or releasing the vehicle.
Dealer Reports
For dealers with involved vehicles, a listing with involved vehicles has been prepared and will be provided to U.S. and
Canadian dealers through the GM GlobalConnect Recall Reports, or sent directly to export dealers. The listing may
contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor
vehicle registration data for any purpose other than follow-up necessary to complete this program is a violation of law in
several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to
complete this program.
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, Sections 1.4 and 6.1.10, for
courtesy transportation program details.
Customer Notification
USA & Canada - General Motors will notify customers of this program on their vehicle (see copy of customer letter included
with this bulletin).
Export - Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor
Vehicle Safety Act. For owners outside these areas, dealers should notify customers using the attached sample letter.

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

Page 2 of 3

Customer Satisfaction Program
18125 Loss of Propulsion High Voltage Battery Without Notification
May 2018
This notice applies to your vehicle, VIN: ________________________________
Dear General Motors Customer:
We have learned that your 2017-2018 model year Chevrolet Bolt EV vehicles may have a condition where the software
will not detect the difference in the state of charge between the cell groups of the battery and over predict the indicated
battery range. The current software may not provide sufficient warning prior to a battery cell low range condition, which
may result in a loss of propulsion. Only certain vehicles will experience the battery low voltage cell condition.
Your satisfaction with your Chevrolet Bolt EV is very important to us, so we are announcing a program to provide
additional warning if this battery low voltage cell condition occurs.
What We Will Do: Your GM dealer will reprogram the hybrid powertrain control module 2. This service will be
performed for you at no charge until May 31, 2020. After that, any applicable warranty will apply.
What You Should Do: To limit any possible inconvenience, we recommend that you contact your dealer as soon as
possible to schedule an appointment for this repair.
If you have any questions or concerns that your dealer is unable to resolve, please contact the appropriate Customer
Assistance Center at the number listed below.
Division
Chevrolet
Puerto Rico – English
Puerto Rico – Español
Virgin Islands

Number
1-800-222-1020
1-800-496-9992
1-800-496-9993
1-800-496-9994

Text Telephones (TTY)
1-800-833-2438

We sincerely regret any inconvenience or concern that this situation may cause you. We want you to know that we will
do our best, throughout your ownership experience, to ensure that your Chevrolet Bolt EV provides you many miles of
enjoyable driving.
Terry M. Inch
Executive Director
Global Connected Customer Experience
GM Recall: 18125

Page 3 of 3

GLOBAL SAFETY FIELD INVESTIGATIONS
DCS4825
URGENT - DISTRIBUTE IMMEDIATELY
Date:

August 15, 2018

Subject: 18125 01 - Customer Satisfaction
Loss of Propulsion High Voltage Battery Without Notification
Service Procedure Revised
Models: 2017-2018 Chevrolet Bolt EV
To:

All General Motors Dealers

This bulletin has been revised to add a step in the service procedure. Please
discard all copies of 18125.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS