20NA173

Bulletin No.:
Service Bulletin
Date:
20-NA-173
September, 2020
TECHNICAL
Subject:
Service Vehicle Soon Light Illuminated, DTC P0534 Set
Brand:
Model:
Chevrolet
Bolt EV
Model Year:
Breakpoint:
from
to
from
to
2017
2019
—
—
Engine:
Transmission:
—
—
Involved Region or Country
North America, Europe, China
Condition
Some customers may comment on the Service Vehicle Soon light being illuminated.
This condition may be more noticeable in colder weather.
Technicians may find DTC P0534 set.
Cause
This condition may be caused by a glitch in the Hybrid/EV Powertrain Control Module 2
software that sets DTC P0534.
Correction
Check the function of the A/C system and make sure the refrigerant is at the proper fill. If
the A/C system and refrigerant is correct then update the Hybrid/EV Powertrain Control
Module 2 with the latest software.
If the refrigerant is low, follow the service manual diagnostics to repair and update the
Hybrid/EV Powertrain Control Module 2 with the latest software.
Service Procedure
Caution: Before downloading the update files, be sure
the computer is connected to the internet through a
network cable (hardwired). DO NOT DOWNLOAD or
install the files wirelessly. If there is an interruption
during programming, programming failure or control
module damage may occur.
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
Copyright 2020 General Motors LLC. All Rights Reserved.
•
•
•
Programming Support Tool to maintain system
voltage. Refer to www.gmdesolutions.com for
further information. If not available, connect a fully
charged 12V jumper or booster pack disconnected
from the AC voltage supply. DO NOT connect a
battery charger.
Ensure the ignition is turned OFF, load on the
vehicle’s battery such as; interior lights, exterior
lights (including daytime running lights), HVAC,
etc. may affect the download process.
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.
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September, 2020
Bulletin No.: 20-NA-173
5644477
5431207
Bulletin No.: 20-NA-173
September, 2020
Page 3
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 Information section of this bulletin.
Important: When programming a module in GM’s new
Vehicle Intelligence Platform, or VIP, the power mode
(ignition) needs to be off or errors may occur. This
involves the 2020 Chevrolet Corvette, Cadillac CT5 and
CT4, as well as the upcoming full-size Chevrolet, GMC,
Cadillac SUVs and Buick Envision. Serial Data
Message Authentication also needs to have the
ignition off.
1. Reprogram the Hybrid/EV Powertrain Control
Module 2. Refer to K114B Hybrid/EV Powertrain
Control Module 2: Programming and Setup in SI.
Modify as required (e.g., select x module from the
controller screen). Then provide step-by-step
instructions or refer to SI procedure.
5644478
Page 4
September, 2020
Bulletin No.: 20-NA-173
5431209
Important: To avoid warranty transaction rejections,
you MUST record the warranty claim code provided on
the SPS Warranty Claim Code (WCC) screen shown
above on the job card. Refer to callout 1 above for the
location of the WCC on the SPS screen.
2. Record the SPS Warranty Claim Code on the job
card for warranty transaction submission.
Parts Information
No parts are required for this repair.
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
Description
Labor Time
Use
Published
Labor
2810265
Operation
Time
Important: To avoid warranty transaction rejections,
carefully read and follow the instructions below:
• The SPS Warranty Claim Code must be accurately
entered in the “SPS 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 “SPS Warranty Claim Code” field of the
transaction, otherwise the transaction will reject. It is
best practice to enter the FINAL code provided by
SPS/SPS2.
Hybrid Powertrain Control
Module 2 Reprogramming
with SPS
Bulletin No.: 20-NA-173
September, 2020
Page 5
Warranty Claim Code Information Retrieval
If the SPS Warranty Claim Code was not recorded on
the Job Card, the code can be retrieved in the SPS
system as follows:
1. Open TLC/TIS on the computer used to program
the vehicle.
2. Select and start SPS/SPS2.
3. Select Settings.
4. Select the Warranty Claim Code tab.
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.
Version
1
Modified
Released September 03, 2020
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 equipment, tools, 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 GM dealer for information on whether your vehicle may benefit from the
information.
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