20NA150

Bulletin No.:
Service Bulletin
Date:
20-NA-150
August, 2020
TECHNICAL
Subject:
Brand:
Glow Plug Control Module Update for P133x and/or P067x
Model:
Model Year:
from
to
VIN:
from
Engine:
Silverado
2017
2019
L5P
Chevrolet
Silverado 4500HD/
5500HD/6500HD
2019
2020
L5D
GMC
Sierra
2017
2019
L5P
Involved Region or Country
Transmission:
to
All
North America, Canada, Middle East, Israel, Palestine
Additional Options (RPOs)
Condition
Some customers may comment on a MIL (Malfunction Indicator Lamp) or SES (Service
Engine Soon) messages illuminated.
Technician may find the following DTCs set or in recent history:
• P1338
• P1339
• P133A
• P133B
• P133C
• P133D
• P133E
• P133F
• P0671
• P0672
• P0673
• P0674
• P0675
• P0676
• P0677
• P0678
• P067A
• P067B
• P067C
• P067D
• P067E
• P067F
• P06C5
• P06C6
• P06C7
• P06C8
• P06C9
• P06CA
• P06CB
• P06CC
Cause
The cause of the condition may be an issue with the software in the Glow Plug Control
Module (GPCM).
Correction
Reprogram the GPCM.
Copyright 2020 General Motors LLC. All Rights Reserved.
Page 2
August, 2020
Bulletin No.: 20-NA-150
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.
5431207
Bulletin No.: 20-NA-150
August, 2020
Page 3
Important: TIS2WEB screen shown. Techline Connect
screen is similar and will be included soon.
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 section
of the bulletin.
1. Reprogram the Glow Plug Control Module. Refer to
K34 Glow Plug Control Module: Programming and
Setup in SI.
5431209
Important: TIS2WEB screen shown. Techline Connect
screen is similar and will be included soon.
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 SPS Warranty Claim Code on job card for
warranty transaction submission.
Page 4
August, 2020
Bulletin No.: 20-NA-150
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
*2886908
Reprogram GPCM for P133x and/or P067x
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
1
Modified
Released July 23, 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.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION