Bulletin No.: PIT5832N
Published date: 05/17/2024

Preliminary Information
PIT5832N Diagnostic Tip: Unable to complete the Serial Data
Authentication Con guration/ No Start Or Unable To Perform Theft
Relearn After Replacing Or Programming A Module / DTC U1962
Models
Brand:
Buick

Model:
Envision

Model Years:

VIN:
from to

Engine: Transmissions:

2021 - 2023

All

All All

All

BrighDrop Zevo 400

2023

All

All All

All

Brightdrop EV600

2022 - 2024

All

All All

All

Cadillac

CT4

2020 - 2024

All

All All

All

Cadillac

CT5

2020 - 2024

All

All All

All

Cadillac

Escalade Models

2021 - 2024

All

All All

All

Cadillac

LYRIQ

2023 - 2024

All

All All

All

Cadillac

XT4

2024

All

All All

All

Chevrolet

Blazer EV

2024

All

All All

All

Chevrolet

Colorado

2023

All

All All

All

Chevrolet

Corvette

2020 - 2024

All

All All

All

Chevrolet

Silverado 1500 New (RPO J22, VIN Digit 12 = A or D) 2022

All

All All

All

Chevrolet

Silverado 1500

2023 - 2024

All

All All

All

Chevrolet

Silverado EV Models

2024

All

All All

All

Chevrolet

Silverado 2500HD/3500HD

2024

All

All All

All

Chevrolet

Suburban

2021 - 2024

All

All All

All

Chevrolet

Tahoe

2021 - 2024

All

All All

All

GMC

Canyon

2023

All

All All

All

GMC

HUMMER EV

2022 - 2024

All

All All

All

GMC

HUMMER EV SUV

2024

All

All All

All

GMC

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

2022

All

All All

All

GMC

Sierra 1500

2023 - 2024

All

All All

All

GMC

Sierra 2500HD/3500HD

2024

All

All All

All

GMC

Yukon Models

2021 - 2024

All

All All

All

North America, Europe, Kazakhstan, Uzbekistan, Russia, Middle East, Israel, Palestine,
Involved Region or Country Argentina, Brazil, Bolivia, Chile, Columbia, Ecuador, Paraguay, Peru, Uruguay, Japan, S.
Korea, Thailand, Australia/New Zealand, Other Africa
Condition
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 Con guration.
2. DTC: U1962 set current in ANY Module.

3. No Start.
4. Invalid Data codes with certain modules even through you can still review the
data with GDS2.
5. Unable to perform a theft relearn or learn remotes back to the vehicle.
6. Unable to perform Module setup or learn.
7. AIrbag Indicator may illuminate.
8. You may also notice that the VIN number will not self-populate in GDS2.
The Serial Data Authentication Con guration procedure runs automatically as part of
the programming procedure.

Cause

The Serial Data Authentication Con guration is a security handshake between all the
modules on the vehicle. One of the main indicators the Serial Data Authentication
Con guration 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 Con guration (SDAC) following Instructions in SI using
Document ID: 5404959. Be sure the vehicle is in the O Power Mode position before running the Serial Data
Authentication Con guration 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 Con guration (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 le
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.

5.

7. Once the module that caused the concern has been identi ed, attempt to SPS program the module if a
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 nd 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 e ected 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 di erent 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

14

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-Add additional steps to the correction field to
address new concerns seen in the field.
05/10/2024 to add Silverado EV and add steps to correction field
for hands free start
05/17/2024 to add Bright drop vehicles

© 2024 General Motors. All Rights Reserved.