All

All

All

All

GMC

Acadia

2024 - 2025

All

All

All

All

GMC

Canyon

2023 - 2025

All

All

All

All

GMC

HUMMER EV 2022 - 2026

All

All

All

All

GMC

HUMMER EV 2024 - 2026
SUV

All

All

All

All

GMC

Sierra 1500
2022
New (RPO
J22, VIN Digit
5 = U or H)

All

All

All

All

GMC

Sierra 1500

2023 - 2026

All

All

All

All

GMC

Sierra
2500HD

2024 - 2026

All

All

All

All

GMC

Sierra
3500HD

2024 - 2026

All

All

All

All

GMC

Sierra Denali
EV

2024 - 2026

All

All

All

All

GMC

Terrain

2025-2026

All

All

All

All

GMC

Yukon

2021 - 2026

All

All

All

All

GMC

Yukon XL

2021 - 2026

All

All

All

All

Involved Region or Country

North America, Europe, Kazakhstan, Uzbekistan, Russia, Middle East, Israel, Palestine,
South America Japan, S. Korea, Thailand, Australia/New Zealand, Other Africa

Condition

After replacing a module on a Vehicle Intelligence Platform (VIP) vehicle, technicians may
encounter issues such as:
1. Serial Data Authentication Configuration failing to complete.
2. DTC U1962 set in any module. (Current and NOT in History)
3. No start condition.
4. Invalid data codes (data still viewable in GDS2).
5. Inability to perform theft relearn or remote pairing (VTD Secure Access Locked).
6. Unable to perform Module setup or learn.
7. Airbag Indicator may illuminate.
8. VIN not auto-populating in GDS2.

Cause

Serial Data Authentication Configuration (SDAC) is a security handshake between
vehicle modules. If it fails—often due to mismatched security codes—DTC U1962 sets,
disabling features.
This typically happens when SDAC isn’t completed properly after programming a
replaced module.
SDAC does not run automatically unless “Replace and Program” is selected when
needed. If that step is missed or SDAC fails, it's up to the technician to identify the issue
and run the procedure manually.
See Example of the expected DTCs below:

Bulletin No.: PIT5832V

June, 2025

Page 3

5784155

Correction
If Lost Communication DTCs are current, diagnose those first.
If U1962 is only in history and clears successfully, SDAC is not required and will not resolve the issue.
When SDAC fails, SPS will display an error message. Refer to the table below for possible causes and recommended actions based on the failure observed.
* In the remedy column, Serial Data Authentication Configuration may be attempted after each step. If the procedure
is successful, there is no need to continue with the recommendations
The SDAC will run up to 3 times before it fails, If a vehicle will not complete the SDAC, a pop up box will display that
may lead you to information to what is causing the concern. Note: Some times a error code E7010 will appear and
the pop up box will appear slightly faded in the back ground. (See examples below)
There are 5 areas in the pop up box that include the Function, Sub function, System, ECU, Error, Please try and
record or take a photo of the pop up box and review the error types below for your symptom.

Page 4

June, 2025

Bulletin No.: PIT5832V

6962533

6962534

Error Type

Description

Remedy

Pre-Conditions

Vehicle will not shut Off.

For passive start vehicles unable to
power OFF:
SPS Programming → BCM →
Control Function Power Off SEE
PHOTO A BELOW

Unable to complete a module setup due to a VTD
error.

Confirm Replace & Program was
selected if the module was replaced.
If not, run SDAC then retry the setup.
SEE PHOTO B & E BELOW

VTD Secure Access Locked pop up
message appears

Bulletin No.: PIT5832V
Error Type

June, 2025
Description

Page 5
Remedy

Configure Link in Sub Function box

Communication issue between tool, Serial Data
Gateway Module (K56), or other controllers via
Ethernet.

Try SDAC after each step (stop if
successful):
SEE PHOTO E BELOW
1. Ensure the K56 Serial Data
Gateway module is fully programmed
to the latest software.
2. Check for aftermarket devices or
harnesses plugged into the DLC.
SEE PHOTO C BELOW
3. Use a hardwired connection from
the PC to the MDI. Reset TLC if
switching from wireless.
4. Perform a global reset by
disconnecting the 12V battery
negative cable for 1 min.
Note: EV Global Reset:
Before disconnecting battery cables
on electric vehicles:
1. Ensure the ignition is OFF.
2. Using a digital multimeter, check
the 12 V battery voltage.
3. If the voltage is 13.5 V or above,
Battery Maintenance Mode is active.
4. Wait for the T18 Battery Charger
to deactivate before disconnecting
the battery negative cable.
5. Follow the Battery Negative Cable
Disconnection and Connection
procedure found under the Starting,
Charging, and Low Voltage Energy
Storage category.

The system box reads "SERVER"

This is not a vehicle related issue. SPS is unable
to reach servers to complete the requested task.

Check PC internet connection and
retry SDAC.
SEE PHOTO E BELOW
Wait 2 hours and try again
If still a concern, wait one day and try
again, If no success, Contact
Techline Support

Page 6

June, 2025
Error Type

Bulletin No.: PIT5832V
Description

Remedy

The ECU box reads a global ID
which points to a specified ECU

The system failure indicates an ECU failure and
specifies which ECU failed.
SEE PHOTO D BELOW
In Photo D example, the Global ID is listed as
K85, which is for the Restraints Occupant Classification System Module . The module's name can
be found by looking at the global codes listed
under "Control Module References" document in
SI for the vehicle that is being working on

Try SDAC after each step (stop if
successful):
SEE PHOTO E BELOW
1. Ensure the K56 Serial Data
Gateway module is fully programmed
to the latest software.
2. Reprogram the failing module if an
update is available.
3. Pull the fuse supplying power to
the failing module. If the fuse is a
three-prong fuse which powers
multiple modules, a two-prong fuse
will be needed to power the
unaffected module. Then run SDAC.
a. If SDAC completes after removing
the fuse, reconnect the fuse and
attempt to run SDAC.
b. If SDAC fails for the same module,
that module will need to be replaced.
c. If SDAC fails again for a different
module, ensure vehicle preconditions are met (OFF). Read
codes to identify any communication
or programming faults.

ECU Box Displays ECU N/A

The system failure indicates ECU failure, but the
ECU column is N/A or blank

Contact Techline Support
Immediately for SPS log retrieval
before further program attempts

PHOTO A

6636543

Photo B

Bulletin No.: PIT5832V

June, 2025

Page 7

5970010

Photo C

6676712

Photo D

Page 8

June, 2025

Bulletin No.: PIT5832V

6962534

Photo E

5970011

Version

20

Modified

04/06/2021 - Created on.
01/26/2022 - Update to add models and model years and to add to diagnosis.
08/29/2022- Update to add Truck models with VIP communications.
09/29/2022- Update PI to fix model descriptions for Pick up models.

Bulletin No.: PIT5832V

June, 2025

Page 9

11/18/2022- Update PI to make changes to steps 4 and add steps.
01/31/2023- Update to change title to make PI easier to find and add 2023 truck models.
02/16/2023- Update to add 2023 Cadillac LYRIQ.
03/06/2023- Update to add Brightdrop EV600 Model.
05/11/2023- Update to add Hummer SUV and Canyon/Colorado models.
08/30/2023- Update to add 2024 models years and add Blazer EV and 2024 Silverado
and Sierra HD models.
11/14/2023- Update to add models and model years and also add export countries per
Brand Quality.
03/11/2023- Updated to add additional steps to the correction field to address new
concerns seen in the field.
05/10/2024 - Updated to add Silverado EV and add steps to correction field for hands
free start.
05/17/2024 - Updated to add Bright drop vehicles.
06/26/2024 - Updated to add new models years and add additional diagnostic steps to
correction field.
10/28/2024- Update models to model year 2025.
12/13/2024- Update to add new models and update model years.
01/10/2025- Update to add new models and update model years.
01/24/2025- Update to add new models and update model years.
06/25/2025- Updated to add model years and changes per engineering

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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