Bulletin No.: PIT5832T
Published date: 01/10/2025

Preliminary Information
PIT5832T Diagnostic Tip: Unable to complete the Serial Data
Authentication Configuration/ No Start Or Unable To Perform Theft
Relearn After Replacing Or Programming A Module / DTC U1962
Models
Brand:
Buick

Model:
Envision

Buick
Enclave
BrightDrop Zevo 400
BrightDrop Zevo 600
Brightdrop EV600
Cadillac

CT4

Cadillac

CT5

Cadillac

Escalade Models

Cadillac

LYRIQ

Cadillac

XT4

Chevrolet Blazer EV
Chevrolet BrightDrop 400
Chevrolet BrightDrop 600
Chevrolet Colorado
Chevrolet Corvette
Chevrolet Corvette E-Ray
Chevrolet Equinox
Chevrolet Equinox EV
Chevrolet

Silverado 1500 New (RPO J22, VIN
Digit 12 = A or D)

Chevrolet Silverado 1500
Chevrolet Silverado EV Models
Chevrolet Silverado 2500HD/3500HD
Chevrolet Suburban
Chevrolet Tahoe
Chevrolet Traverse (all new)
GMC

Acadia

GMC

Canyon

GMC

HUMMER EV

Model
Years:
2021
2025
2025
2024
2023
2024
2022
2020
2025
2020
2025
2021
2024
2023
2025
2025
2024
2025
2025
2025
2023
2025
2020
2025
2024
2025
2025
2024
2025

-

-

-

-

-

-

2022
2023
2025
2025
2025
2021
2025
2021
2025
2024
2025
2024
2025
2023
2024
2022
2025

-

-

VIN:
Engine: Transmissions:
from to
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All

Brand:

Model:

Model
Years:

VIN:
Engine: Transmissions:
from to

GMC

HUMMER EV SUV

2024 2025

All

All All

All

GMC

Sierra 1500 New (RPO J22, VIN
Digit 12 = A or D)

2022

All

All All

All

GMC

Sierra 1500

All

All All

All

GMC
GMC

Sierra 2500HD/3500HD
Terrain

All
All

All All
All All

All
All

GMC

Yukon Models

All

All All

All

Involved Region or
Country

2023 2025
2025
2025
2021 2025

North America, Europe, Kazakhstan, Uzbekistan, Russia, Middle
East, Israel, Palestine, Argentina, Brazil, Bolivia, Chile, Columbia,
Ecuador, Paraguay, Peru, Uruguay, Japan, S. Korea, Thailand,
Australia/New Zealand, Other Africa
Some technicians may experience one or more of the following
concerns after replacing or reprogramming a module on one of the
new Vehicle Intelligence Platforms. or VIP Vehicles.

1. Unable to complete the Serial Data Authentication

Condition

2.
3.
4.
5.
6.
7.
8.

Configuration.
DTC: U1962 set current in ANY Module.
No Start.
Invalid Data codes with certain modules even through you can
still review the data with GDS2.
Unable to perform a theft relearn or learn remotes back to the
vehicle.
Unable to perform Module setup or learn.
AIrbag Indicator may illuminate.
You may also notice that the VIN number will not self-populate
in GDS2.

The Serial Data Authentication Configuration procedure runs
automatically as part of the programming procedure.

Cause

The Serial Data Authentication Configuration is a security
handshake between all the modules on the vehicle. One of the main
indicators the Serial Data Authentication Configuration did not
complete properly is DTC: U1962 is current in one or more
modules.
See Example below:

Correction:
The dealer will need to perform the Serial Data Authentication Configuration (SDAC) following
Instructions in SI using Document ID: 5404959. Be sure the vehicle is in the Off Power
Mode position before running the Serial Data Authentication Configuration procedure.
For EV vehicles that have Hands free start, you may not be able to shut off the vehicle using
the off soft button of the virtual cockpit smart control of the radio. If you experience this
concern, you will have to access SPS programming in Techline Connect and select BCM and
select "control function/ power mode off". See screen shot below.
Note: After you use this function, you may notice that the SDAC box may be missing from the
bottom of the controller list, if you experience this, you will need to back out to the VIN
screen and then go back to the controller screen for it to appear again.

If a vehicle will not complete the Serial Data Authentication Configuration (SDAC) after
updating or replacing a module, please perform the following:

1. If a module was replaced, make sure the new module was SPS programmed correctly or
the SDAC will fail and not complete correctly.

2. If a module such as the BCM is replaced, and the immobilizer learn needs to be
completed after replacement, the tech needs to make sure that the SDAC completes
correctly, or a pop-up message like the one below will be displayed:

3. If a vehicle will not complete the SDAC, run the SDAC (using the Serial Data
Authentication selection in Techline Connect) again. Verify the key fob is inside the
vehicle. If the key fob is not inside the vehicle, the serial data authentication
configuration procedure which runs automatically at the end of the programming step
will fail even though the programming appears to run successfully. If the serial data
authentication configuration procedure fails, DTC U1962 will set and/or the setup step
will fail or be incomplete. Select the box in SPS controller list in the lower right-hand
corner labeled "Serial Data Authentication Configuration".

4. The SDAC will run up to 3 times before it fails. When it fails, there should be a pop box
that shows up on the screen like the one below. Check and record the items listed under
System and ECU. If the system box reads "Server" then the issue is related to the SPS
system server or internet connection and not related to the vehicle. Attempt the SDAC
again at a later time or the next day early in the morning. ( If the box doesn't read
"Server" continue to step 5 ).
NOTE: Be patient because it can take a few moments for it to actual pop-up box to
appear or sometimes you may have to rerun the SDAC again for it. to pop-up

5. If the system box reads "ECU", then the Global ID of the module that is causing the

concern should be able to be obtained. In the example above, the Global ID is listed as
K36, which is for the SDM. 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
6. Sometimes the pop-up box will read "ECU" but it will not give you a Module ID in the
ECU box. In this case, the servicing dealer will have to contact Techline support and they
will have to assist by getting a SPS log file from the dealership's system. If this is the
case, they must be contacted right after the SDAC failure. If any other programming is
attempted before contacting Techline, then the SPS log will be erased.

Sometimes the pop-up box will read "Configuration Link" as the Sub Function. In this
case, inspect for after market items or wiring plugged into the DLC connector. Some fleet
vehicles may have an aftermarket device plugged inline with the DLC connector. Example
shown below. These devices can interfere with programming and the SDAC process. For
additional information, See current version of bulletin: 13-08-116-001.

7. Once the module that caused the concern has been identified, update the Serial Data
Gateway Module to its latest software version and then attempt to SPS program the
module that was causing the SPS error if an update is available and then attempt to run
the SDAC again.
8. If the vehicle is repaired, you may release to the customer. If the SDAC still fails,
Continue to step 9.
9. Pull the fuse that supplies battery power to that module. Sometimes the fuse is a
three-prong fuse that feeds other modules. In this case, the servicing technician will
need to find a two-prong fuse to power the other module that was not involved in the
SDAC failure.
10. If the SDAC completes after removing battery power from the module in question,
that module will need to be replaced.
11. Replace the effected module before releasing the vehicle to the customer and verify
that the SDAC completes after SPS programming of the new module.
12. If you keep running the SDAC and each time it fails it keeps showing a different
module as the cause, this may be caused by the vehicle not going to sleep. Let the
vehicle sit for 30 minutes and make sure the key fobs are at least 10 feet away from the
vehicle and perform the SDAC again.

Additional SI Keywords

U1960 U1961 U3034 U3035
Version History
Version

18

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.
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

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