21NA060

Bulletin No.:
Service Bulletin
Date:
21-NA-060
March, 2021
INFORMATION
Subject:
Information on TLC/SPS2 Module Programming Requirements for Vehicles Using GM’s
New Vehicle Intelligence Platform (VIP) Module Architecture
Brand:
Model:
Buick
Envision
2021
2022
2020
2022
Escalade
ESV
2021
2022
Corvette
2020
2022
2021
2022
2021
2022
CT5
Chevrolet
from
to
—
—
Engine:
Transmission:
—
—
Escalade
Tahoe
Suburban
GMC
VIN:
to
CT4
Cadillac
Model Year:
from
Yukon
Yukon XL
Involved Region or Country
North America, Europe, Uzbekistan, Russia, Middle East, Iraq, Israel, Palestine,
Argentina, Brazil, Bolivia, Chile, Colombia, Ecuador, Paraguay, Peru, Uruguay,
Venezuela, Japan, Cadillac Korea (South Korea), GM Korea Company, China, Taiwan,
Thailand, Singapore, Philippines, Australia/New Zealand, Egypt, Other Africa, South
Africa
Information
Information on TLC/SPS2 module programming requirements for GM’s new VIP vehicles.
Important: Carefully read and follow the instructions
below when programming GM vehicles with VIP
module architecture.
• GM Vehicles with VIP module architecture require
different handling than older, legacy vehicles.
Because Techline Connect (TLC) DOES NOT
automatically execute vehicle identification
number (VIN) Read with the power mode “OFF",
extra care MUST be taken to ensure that the VIN
is correctly identified prior to programming.
• It is incumbent on the technician to verify that the
VIN reflected in Techline Connect matches the
VIN plate on the vehicle to which they are
connected.
Copyright 2021 General Motors LLC. All Rights Reserved.
Reading the VIN from the Vehicle
• For the TLC application, service technicians need
to always ensure that the power mode (ignition) is
“ON” before reading the VIN from the vehicle’s
VIN master module and that they do not select a
VIN that is already in the TLC application memory
from a previous vehicle.
• DO NOT assume that selecting VINs from a
similar vehicle model year and/or model will
provide the correct software or calibration files for
the vehicle VIN that is requiring a programming or
reprogramming event. Vehicle software and
calibration files are tied to vehicle features and not
all vehicles have the same features.
• Programming or reprogramming modules with
incorrect VINs and software and calibration files
from incorrect VINs can cause future serviceability
issues as well as potential vehicle performance
issues that may require the customer’s vehicle to
be reprogrammed again.
Page 2
March, 2021
Bulletin No.: 21-NA-060
Caution: Be sure the VIN selected in the drop down
menu (1) and the VIN connected (2) match the VIN
plate of the vehicle to be programmed to ensure the
correct software and/or calibration is loaded onto the
module of the vehicle intended to be programmed.
5743643
Important: The service technician always needs to
verify that the VIN displayed in the TLC left side drop
down menu and the top center window match the VIN
plate of the vehicle to be programmed prior to using
Service Programming System 2 (SPS2) for
programming or reprogramming a module.
• If the VIN that shows up in the TLC top center
window after correctly reading the VIN from the
vehicle does not match the VIN plate of the
vehicle, manually type in the VIN characters from
the vehicle VIN plate into the TLC top center
window and use these for programming or
reprogramming the subject module with the
correct vehicle VIN and software and/or
calibrations.
• The Engine Control Module (ECM) is the master
module that TLC reads to determine the VIN of the
vehicle. If the VIN read from the vehicle by TLC
does not match the VIN plate of the vehicle, the
ECM also needs to be reprogrammed with the
correct VIN, software and calibrations that match
the vehicle’s VIN plate.
•
If SPS2 blocks the programming or
reprogramming of the subject module and/or the
ECM due to already having the same software
and/or calibrations in the module, please contact
the Techline Customer Support Center (TCSC)
for help.
Important: Programming the Module
• 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 2020-2022 Chevrolet
Corvette, Cadillac CT4 and CT5 and 2021-2022
full-size Chevrolet, GMC, Cadillac SUVs and
Buick Envision. Serial Data Message
Authentication also needs to have the
ignition “OFF.”
• 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.
Bulletin No.: 21-NA-060
•
•
•
March, 2021
Page 3
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.
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.
Clear DTCs after programming is complete.
Clearing powertrain DTCs will set the Inspection/
Maintenance (I/M) system status indicators to NO.
Version
1
Modified
Released March 10, 2021
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