20NA218

Bulletin No.:
Service Bulletin
Date:
20-NA-218
January, 2021
TECHNICAL
Subject:
Brand:
Cadillac
Possible Crank No Start or Extended Crank with DTC P12A6
Model:
Escalade
Escalade ESV
Corvette
Model Year:
Breakpoint Date:
to
from
to
2021
2021
SOP
November
4, 2020
5.3L (L84),
6.2L (L87)
2020
2020
—
—
6.2L (LT2)
—
4.3 (LV3) 5.3
(L82, L84)
6.2 (L87)
Silverado 1500
Chevrolet
2020
2020
—
Silverado 2500HD/
3500HD
Suburban
Tahoe
2021
2021
SOP
November
4, 2020
5.3L (L84),
6.2L (L87)
—
4.3 (LV3) 5.3
(L82, L84)
6.2 (L87)
2020
2020
—
Sierra 2500HD/
3500HD
Yukon
Yukon XL
Transmission:
6.6 (L8T)
Sierra 1500
GMC
Engine:
from
—
6.6 (L8T)
2021
2021
SOP
November
4, 2020
5.3L (L84),
6.2L (L87)
Involved Region or Country
North America
Condition
Some customers may comment on a possible crank no start or extended crank.
Technicians may find DTC P12A6 set current or in recent history.
Cause
The cause of the condition may be a software anomaly in the Engine Control
Module (ECM).
Correction
Reprogram the ECM.
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
Copyright 2021 General Motors LLC. All Rights Reserved.
•
•
•
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.
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.
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Bulletin No.: 20-NA-218
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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 Engine Control Module (ECM).
Refer to K20 Engine Control Module: Programming
and Setup in SI.
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January, 2021
Bulletin No.: 20-NA-218
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 the SPS Warranty Claim Code on the job
card for warranty transaction submission.
Warranty Information
Important: Warranty coverage code E2 applies for this
module programming event. ECM 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
2887038*
Description
Labor Time
Engine Control Module
Reprogramming for Crank
No Start or Extended Crank
Condition
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 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.: 20-NA-218
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
3
Modified
Released November 17, 2020
December 18, 2020 – Added 2020 Truck Models and updated programming information
in the Service Procedure.
January 15, 2021 – Added the 2020 Corvette Model and North America to the Involved
Region or Country section.
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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