20NA073

Service Bulletin
Bulletin No.:
20-NA-073
Date:
June, 2020
TECHNICAL
Subject:
Brand:
Loss of Brake Assist, Various Messages Displayed in Driver Information Center (DIC),
Brake Pedal Travel and Apply May Feel Different, One or More of the Following DTCs
May be Set P0606 with C0021, C05D2, C0595, C2A3B, C0024, C053D.
Model:
Model Year:
from
to
CT6
2019
2020
XT5
2020
2020
VIN:
from
Engine:
to
2.0L (LSY)
or
4.2L (LTA)
Cadillac
XT6
2020
2020
Chevrolet
Blazer
2020
2020
Chevrolet
Silverado
2019
2020
July 7, 2018
Chevrolet
Silverado 1500
(New Model - 12th
VIN Digit = 7)
2019
2019
July 7, 2018
GMC
Acadia
2020
2020
GMC
Sierra
2019
2020
Involved Region or Country
Transmission:
2.0L (LSY)
All
EOP
EOP
All
2.0L (LSY)
July 7, 2018
EOP
All
North America, Middle East, Israel, Russia, Japan, Cadillac Korea (South Korea),
Palestine, Chile, Columbia, Ecuador, Peru
Some customers may comment on one or more of the following conditions:
Note:
•
Condition
Brake pedal travel may be longer/softer along with an increase in pedal force
compared to normal.
• Various messages in DIC.
• Loss of Brake Assist.
A technician may find one or more of the following DTC’s:
• P0606 with C0021 — Control Module Processor Performance
• C05D2 — Brake Master Cylinder Piston Excessive Travel Detected
• C0595 — Brake System Control Module Internal Driver Performance
• C2A3B — Hydraulic Shutdown Test Not Run
• C0024 — Brake Pedal Simulator Separating Solenoid Valve
• C053D — Brake Pressure Sensor Circuit Performance
By design, this fail safe mode is called “Push-Thru” which means the braking efforts rely
on the mechanical nature of the system to push fluid to brakes at all four corners.
Cause
The cause of the condition may be the model-based calculated solenoid temperature
deviating from the actual solenoid temperature, as well as a software issue where the
motor position sensors do not correlate.
High solenoid Pulse Width Modulation (PWM) commands, combined with the inaccurate
solenoid temperature, can cause the diagnostic to set.
Correction
Dealers are to reprogram the eBoost Brake System Control Module (BSCM).
Copyright 2020 General Motors LLC. All Rights Reserved.
Page 2
June, 2020
Bulletin No.: 20-NA-073
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 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.
5431207
Bulletin No.: 20-NA-073
June, 2020
Page 3
Important: TIS2WEB screen shown. Techlink Connect
screen is similar and will be included in the near future.
Important: If the Same Calibration/Software Warning
is noted on the SPS 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.
1. Reprogram the Brake System Control Module.
Refer to K160 Brake System Control Module
Programming and Setup in SI. Then provide
step-by-step instructions or refer to SI procedure.
5431209
Important: TIS2WEB screen shown. Techline Connect
screen is similar and will be included in the near future.
Important: To avoid warranty transaction rejections,
you MUST record the warranty claim code provided on
the SPS Warranty Claim Code (WCC) screen 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.
Page 4
June, 2020
Bulletin No.: 20-NA-073
Warranty Information
Important: Federal Select Component Emission
Warranty coverage code E2 applies for this module
programming event. This reprogramming is covered for
8 years/80,000 miles (U.S.) or 8 years/130,000 km
(Canada).
For vehicles repaired under the Emission coverage,
use the following labor operation. Reference the
Applicable Warranties section of Investigate Vehicle
History (IVH) for coverage information.
Labor
Operation
Description
Labor Time
2886738*
Recalibration of Brake
System Control Module
0.3 hr
*This is a unique Labor Operation for bulletin use only.
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.
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 TIS on the computer used to program the
vehicle.
2. Select and start SPS.
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
3
Modified
Released March 23, 2020
Revised April 15, 2020 — Added GMC Sierra and Chevrolet Silverado to Models.
Revised May 29, 2020 — Added DTC’s P0606 with C0021, C05D2, C0595, C2A3B,
C0024, C053D.
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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