NHTSA ID Number: 10199253
Manufacturer Communication Number: 20NA218
TSB/Document Date: 2021-07-19
Summary
This service bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6.
Service Bulletin
Bulletin No.:
20-NA-218
Date:
May, 2021
TECHNICAL
Subject:
Brand:
Possible Crank No Start or Extended Crank with DTC P12A6
Model:
Engine:
from
to
Encore GX
2020
2021
SOP
March
6, 2021
1.2L (LIH)
Regal
2019
2020
—
—
1.5L (LFV)
CT5
2020
2020
—
—
3.0L (LGY)
2021
2021
SOP
November
4, 2020
5.3L (L84),
6.2L (L87)
Camaro
2021
2021
SOP
February
15, 2021
2.0L (LTG)
Corvette
2020
2020
—
—
6.2L (LT2)
2021
SOP
January
14, 2021
1.5L (LYX)
2021
SOP
January
15, 2021
Escalade
Equinox
Malibu
2020
2019
2021
2.0L (LTG)
2019
2019
—
—
LV3, L82,
L84, L87.
Silverado 1500
2020
2021
SOP
February
11, 2021
4.3 (LV3) 5.3
(L82, L84)
6.2 (L87)
Silverado
2500HD/3500HD
2020
2021
SOP
February
11, 2021
6.6 (L8T)
2021
2021
SOP
November
4, 2020
5.3L (L84),
6.2L (L87)
Trailblazer (VIN M)
2020
2021
SOP
March
6, 2021
1.2L (LIH)
Sierra 1500
(New Model)
2019
2019
—
—
LV3, L82,
L84, L87.
Sierra 1500
2020
2021
SOP
February
11, 2021
4.3 (LV3) 5.3
(L82, L84)
6.2 (L87)
Sierra
2500HD/3500HD
2020
2021
SOP
February
11, 2021
6.6 (L8T)
Terrain
2020
2021
SOP
January
14, 2021
1.5L (LYX)
2021
2021
SOP
November
4, 2020
5.3L (L84),
6.2L (L87)
Tahoe
Yukon
Yukon XL
Copyright 2021 General Motors
LLC. All Rights Reserved.
1.5L (LFV)
Silverado 1500
(New Model)
Suburban
Breakpoint Date:
to
Escalade ESV
Model Year:
from
—
Page 2
May, 2021
Bulletin No.: 20-NA-218
Involved Region or Country
North America, Europe, Uzbekistan, Russia, Middle East, Palestine, Israel, Brazil, Chile,
Paraguay, Colombia, Ecuador, Peru, Uruguay, Argentina, Japan, Thailand, GM Korea
Company, Cadillac Korea (South Korea), Australia/New Zealand, Egypt, other Africa
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. This could be
accompanied with a crank no start or extended crank issue and additional DTCs P00C6,
P00F4, P0098, P2199 and/or P0096.
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.
• 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 NOT connect a
battery charger.
• Follow the on-screen prompts regarding ignition
power mode, but ensure that anything that drains
excessive power (exterior lights, HVAC blower
motor, etc) is off.
• Please verify that the radio time and date are set
correctly before inserting USB drive into vehicle
for programming, otherwise an error will result.
• Clear DTCs after programming is complete.
Clearing powertrain DTCs will set the Inspection/
Maintenance (I/M) system status indicators to NO.
Caution: Be sure the VIN selected in the drop down
menu (1) is the same as the vehicle connected (2)
before beginning programming.
Bulletin No.: 20-NA-218
May, 2021
Page 3
5743643
5644477
Page 4
May, 2021
Bulletin No.: 20-NA-218
5431207
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 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 Information section of this bulletin.
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.
Bulletin No.: 20-NA-218
May, 2021
Page 5
5644478
5431209
Page 6
May, 2021
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
Labor
Operation
Bulletin No.: 20-NA-218
Description
Labor Time
*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.
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.
Bulletin No.: 20-NA-218
May, 2021
Page 7
Version
10
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 Chevrolet Corvette and North America to the
Involved Region or Country section.
February 08, 2021 – Added 2020 Cadillac CT5, 2019 Chevrolet Silverado 1500 and GMC
Sierra 1500 and engine RPOs.
February 23, 2021 – Added the 2021 Model Year to Chevrolet Silverado 1500, 2500HD/
3500HD and GMC Sierra 1500, 2500HD/3500HD with Breakpoint dates, updated the
Condition section with additional DTCs and updated the Involved Region or Country
section.
March 08, 2021 – Added 2021 Buick Encore GX and Chevrolet Trailblazer (VIN M) with
breakpoints.
March 19, 2021 – Added 2020 Buick Encore GX and Chevrolet Trailblazer (VIN M) and
updated the programming template.
April 05, 2021 – Added 2020 and 2021 Chevrolet Equinox and GMC Terrain and added
Brazil to Involved Region or Country section.
April 23, 2021 – Added the Buick Regal and Chevrolet Malibu models, updated the
Involved Region or Country section and updated the programming bullet points under
Service Procedure.
May 07, 2021 – Added the Chevrolet Camaro and the 2021 Malibu with LTG engine.
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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TSB/Document ID: 20NA218
Replacement Service Bulletin Number:
MFR Communication Date: 2021-05-07
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
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