20NA212

Bulletin No.:
Service Bulletin
Date:
20-NA-212
December, 2020
TECHNICAL
Subject:
IPC Gauges Inoperative or Fluctuate, No Crank, Start then Stall
“This bulletin replaces PIT5586E. Please discard all copies of PIT5586E”
Brand:
Cadillac
Chevrolet
Model:
to
2017
2020
Silverado
2017
2018
Silverado LD
2019
2019
SIlverado 2500HD/
3500HD
2019
2019
Silverado 4500HD,
5500HD, 6500HD
2019
2020
2017
2020
Sierra
2017
2018
Escalade
Escalade ESV
Suburban
Tahoe
GMC
Model Year:
from
Sierra Limited
2019
2019
Sierra 2500HD/
3500HD
2019
2019
Yukon
2017
2020
Involved Region or Country
VIN:
from
Engine:
Transmission:
to
North America, Uzbekistan, Russia, Middle East, Israel, Palestine, Chile, Columbia,
Ecuador, Paraguay, Peru, Japan, S. Korea and Thailand.
Additional Options (RPOs)
Condition #1
Copyright 2020 General Motors LLC. All Rights Reserved.
Some customers may comment on the following condition:
• IPC gauges inoperative
• PRNDL does not indicate transmission position
• Multiple Service System messages
• Multiple Malfunction Indicators illuminated on the IPC
• Radio does not display temperature
• Radio does not shut off when door is opened
• No audible Turn Signal feedback or IPC indicator but the external signals function
• DTC U0155 in multiple modules indicating loss of communication with the IPC
Page 2
December, 2020
Bulletin No.: 20-NA-212
Condition #2
Some customers may comment on the following condition:
• IPC gauges inoperative or fluctuate
• No Crank
• No Start
• Start then Stall
• SIR Light / Service Airbag Message
• Service Suspension Message
• Radio display blank
• Steering Wheel Controls (SWC) not illuminated
• HVAC controls inoperative
• Any of the following DTC's: B1011, B1370, B3980, U0020, U0029, U007D, U0073,
U0078, U0100, U0101, U0102, U0104, U0121, U0140, U0146, U0151, U0155,
U0164, U0184, U0186, U0198, U0237, U0255, U0422
Cause #1
The causes of the condition may be:
An error in the Serial Data Gateway Module (SDGM) microcontroller where the SDGM
will retain power but stop communicating on all CAN channels.
or
The SDGM X1 or X2 connector terminals being bent, backed out, or having loose
terminal tension.
Cause #2
The cause of condition 2 may be the SDGM X1 or X2 connector terminals being bent,
backed out, or having loose terminal tension.
Correction #1
If the symptoms in the 1st Condition are present, reprogram the Serial Data Gateway
Module.
Note:
If after reprogramming the 1st condition is still present then refer to the 2nd Correction
Section.
Correction #2
If the symptoms in the 2nd Condition are present (or symptoms in Condition 1 persist
after performing SDGM reprogramming), then inspect the SDGM connector for any loose,
bent, backed out terminals or connector damage. If a loose, bent, or backed out terminal
is found, replacement of the affected terminal is required. If there is damage to the
connector body, replace the connector housing per the Service Information Connector
End View.
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 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.
Bulletin No.: 20-NA-212
December, 2020
Page 3
5644477
5431207
Page 4
December, 2020
Bulletin No.: 20-NA-212
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 on-screen instructions. The system will
generate a warranty claim code (WCC) for
documentation purposes only. Perform service
information (SI) diagnostics to determine the cause of
the condition. Use the applicable labor operation code
when submitting a warranty claim. Do NOT use the
WCC with the warranty claim submission.
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 K56 Serial Data Gateway Module:
Programming and Setup. Refer to K56 Serial Data
Gateway Module: Programming and Setup in SI.
5644478
Bulletin No.: 20-NA-212
December, 2020
Page 5
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 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 SPS Warranty Claim Code on job card for
warranty transaction submission.
Parts Information
Causal
Part
Description
X
SDGM X1
Terminated Lead
X
SDGM X2
Terminated Lead
Part
Number
Qty
1
84619127
1
Page 6
December, 2020
Bulletin No.: 20-NA-212
Warranty Information
For vehicles repaired under the Bumper-to-Bumper
coverage (Canada Base Warranty coverage), use the
following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH)
for coverage information.
Labor Operation
Description
Labor Time
2887018*
Serial Data Gateway Module Reprogramming with SPS for IPC
Gauge Concerns
0.4 hr
Add
Reprogramming Failure, Inspect and Replace SDGM
Terminal Wire
0.5 hr
5480898*
Inspect and Replace SDGM Terminal Wire
0.5 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/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
3
Modified
Released October 30, 2020
Revised November 16, 2020 – Added 2018 Model Years to vehicles, clarified 2019
Chevrolet Silverado and GMC Sierra models, and updated programming information in
Service Procedure Section.
Revised December 16, 2020 – Added 2017 Model Years to some vehicles.
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.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION