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NHTSA ID Number: 10198882
Manufacturer Communication Number: 21NA111
Summary
This service bulletin provides repair information to correct a customer concern of a Check Engine Light Illuminated, No Start/ No Propulsion, DTC P0A0C.
3 Affected Products
Vehicle
MAKE | MODEL | YEAR |
CHEVROLET | VOLT | 2016-2018 |
Condition
Some customers may comment on one or all of the following concerns:
• No Start
• Loss of propulsion while driving
• Check Engine Lamp illuminated
Cause
The cause of the condition may be software anomalies.
Technicians may find DTC P0A0C set current or in recent history.
Correction
Reprogram the Hybrid Powertrain Control Module 2 with the latest calibration.
The HPCM2 will then ignore the interlock circuit and P0A0C will no longer be a valid DTC for the vehicle. Circuits 5087 & 5088 are no longer present in A28 Battery Disconnect Units.
SEOCONTENT-START
Service Bulletin Bulletin No.: 21-NA-111
Date: May, 2021
TECHNICAL
Subject: Check Engine Light Illuminated, No Start/ No Propulsion, DTC P0A0C
This bulletin replaces PIC6211A. Please discard PIC6211A.
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Buick Velite 2017 2018
— —
— 5ET50
Chevrolet Volt 2016 2018 LKA MKV
Involved Region or Country North America, China
Additional Options (RPOs) L3A or MKA
Condition
Some customers may comment on one or all of the following concerns:
• No Start
• Loss of propulsion while driving
• Check Engine Lamp illuminated
Cause
The cause of the condition may be software anomalies.
Technicians may find DTC P0A0C set current or in recent history.
Correction
Reprogram the Hybrid Powertrain Control Module 2 with the latest calibration.
The HPCM2 will then ignore the interlock circuit and P0A0C will no longer be a valid DTC
for the vehicle. Circuits 5087 & 5088 are no longer present in A28 Battery Disconnect
Units.
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
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 NOTconnect 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.
Caution: Be sure the VIN selected in the drop down
menu (1) is the same as the vehicle connected (2)
before beginning programming.
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Bulletin No.: 21-NA-111 May, 2021 Page 3
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 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 Powertrain Control Module
2. Refer to K114B Hybrid/EV Powertrain Control
Module 2: Programming and Setup in SI.
Page 4 May, 2021 Bulletin No.: 21-NA-111
5644478
5431209
Bulletin No.: 21-NA-111 May, 2021 Page 5
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 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.
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
Description Labor Time
2810265*
Hybrid Powertrain Control
Module 2 Reprogramming
with SPS
Use
Published
Labor
Operation
Time
Important: *To avoid warranty transaction rejections,
carefully read and follow the instructions below:
• The 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.
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 May 06, 2021
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: 21-NA-111
Date: May, 2021
https://www.nhtsa.gov/recalls?nhtsaId=10198882
MC-10198882-9999.pdf 104.776KB
NHTSA ID Number: 10137745
Manufacturer Communication Number: PIC6211A
Summary
This Preliminary Information communication provides the technician with inspection and repair instructions for vehicles with a no start/no propulsion condition that is setting a DTC P0A0C for the high voltage interlock circuit. Technician will reprogram the Hybrid Powertrain Control Module 2 to resolve the concern. The HPCM2 will then ignore the interlock circuit and P0A0C will no longer be a valid DTC for the vehicle
1 Associated Document
Manufacturer Communications
Bulletin No.: PIC6211A
Published date: 08/29/2017
https://www.nhtsa.gov/recalls?nhtsaId=10137745
NHTSA ID Number: 10083074
Manufacturer Communication Number: PIC6211
Summary
THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES THE TECHNICIAN WITH INSPECTION AND REPAIR INSTRUCTIONS FOR VEHICLES WITH A NO START OR NO PROPULSION CONDITION. TECHNICIAN WILL FIND DIAGNOSTIC TROUBLE CODE P0A0C FOR THE HIGH VOLTAGE INTERLOCK CIRCUIT. TECHNICIAN WILL INSPECT THE HIGH VOLTAGE INTERLOCK LOOP CONNECTOR IN THE FRONT OF THE HIGH VOLTAGE BATTERY TO MAKE SURE THE CONNECTOR IS FULLY SEATED. THE DEALER WILL REPLACE THE HIGH VOLTAGE CONTACTOR ASSEMBLY.
1 Associated Document
Service Bulletin Document
Bulletin No.: PIC6211
Date: Aug-2016
https://www.nhtsa.gov/recalls?nhtsaId=10083074
SB-10083074-5448.pdf 410.777KB
Reprogramming
GM Diagnostic/Programming (TIS2Web)
Approved J2534 Device with TIS2WEB can reprogram 1996 and later All GM Modules.
To obtain the latest electronic controller calibration information for your vehicle, go to https://tis2web.service.gm.com/tis2web and enter the vehicle's 17 character Vehicle Identification Number (VIN) and select 'Get CAL ID’.
You can then compare the latest part number with the actual number installed on the vehicle to determine if a reprogram is needed.
The Service Programming System (SPS) application is part of the TIS2Web system. To program an ECU, the SPS application must communicate with the vehicle control modules using the proper J2534 programming interface tool.
The following are the supported interface tools:
The Tech 2 supports model years 1996 and beyond. With the addition of the CAN Diagnostic Interface (CANdi) module, Tech 2 is fully backward compatible with current Tech 2 functionality and operates transparently when diagnosing non-CAN-equipped vehicles.
Servicing the next generation Global A vehicles will require the diagnostic software, GDS2, Global Diagnostic System 2 running on a local PC device while the MDI is connected to the vehicle. The GM MDI is the Global Diagnostic tool for future vehicles starting with Global A vehicles.
The GM MDI was introduced in the fall of 2007 for Pass-Thru programming and offers faster programming speed. It can be used to perform Pass-Thru programming on all vehicles built since 1996 and into the future. Click here to view a list of GDS supported vehicles.
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