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NHTSA ID Number: 10187774
Manufacturer Communication Number: 21NA011
Summary
This service bulletin provides a procedure to correct a customer concern of a Malfunction Indicator Lamp (MIL) Illuminated.
2 Affected Products
Vehicle
MAKE | MODEL | YEAR |
CADILLAC | CT6 | 2019-2020 |
SEOCONTENT-START
Service Bulletin Bulletin No.: 21-NA-011
Date: January, 2021
TECHNICAL
Subject: Malfunction Indicator Lamp (MIL) Illuminated – DTC P262B Set
This bulletin replaces PIP5754. Please discard PIP5754.
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Cadillac CT6 2019 2020 All All 4.2L (LTA) All
Involved Region or Country North America
Condition
Some customers may comment that the MIL is illuminated or was illuminated and
turned off.
Some technicians may find DTC P262B (Control Module Power Off Timer Performance)
active or stored in history in the Engine Control Module (ECM).
Cause
This condition may be caused by the engine cooling down quicker than what the ECM
expects after the vehicle is shut off and then restarted. This can occur in a windy area or if
pulled into an air-conditioned garage for example.
– When this happens, the diagnostic for P262B will set due to the engine temperature
being cooler than what the ECM expects.
Correction
If a vehicle comes in with this DTC set, do not replace the ECM for this condition.
Engineering has released an updated calibration to address this concern. It will be
necessary to reprogram the ECM with the latest calibration. Once the updated calibration
is installed, operate the vehicle and verify that the DTC does not return.
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.
• 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.
• Please verify that the radio time and date are set
correctly before inserting USB drive into vehicle
for programming, otherwise an error will result.
(Use when applicable).
• Clear DTCs after programming is complete.
Clearing powertrain DTCs will set the Inspection/
Maintenance (I/M) system status indicators to NO.
Page 2 January, 2021 Bulletin No.: 21-NA-011
5644477
5431207
Bulletin No.: 21-NA-011 January, 2021 Page 3
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 ECM. Refer to K20 Reprogram
Engine Control Module in SI. Modify as required
(e.g., select x module from the controller screen.
Then provide step-by-step instructions or refer to
SI procedure.)
5644478
Page 4 January, 2021 Bulletin No.: 21-NA-011
5431209
Note: The screenshots above are an example of
module reprogramming, and may not be indicative of
the specific module you’re reprogramming.
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
2810075 Engine Control Module
Reprogramming with SPS
Use
Published
Labor
Operation
Time
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.
Bulletin No.: 21-NA-011 January, 2021 Page 5
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 January 20, 2021
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: 21-NA-011
Date: January, 2021
https://www.nhtsa.gov/recalls?nhtsaId=10187774
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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