NHTSA ID Number: 11012693
Manufacturer Communication Number: 23-NA-151
TSB/Document Date: 2025-01-09
Summary
This service bulletin and criteria within are to determine the internal state of the High Voltage Battery
and core return shipping method.
Refer to Figure 4
Submission Check List
Failed Example
Refer to Figure 5
Vehicle Isolated Outside and
Picture Captured/Submitted
__________
Vehicle to stay isolated outdoors until Hybrid/
Electric Vehicle Battery Pack Removal and
Installation or under the direction of TAC during
any required diagnosis procedure.
TAC Case Created Case #
__________
High Voltage Battery Removal Stability Inspection
Hybrid/Electric Vehicle Battery Pack Analysis
Steps
Results
Submission Check list
High Voltage Disabling at the A4 Hybrid/EV
Battery Pack. Note It is only necessary to
photograph the meter results if greater than
3 volts is observed.
Passed Example
Refer to Figure 6
Failed Example
Refer to Figure 7
Pass
Fail
Pictures Captured/Submitted
Inspect all Battery Pack HV connectors and
headers for soot, moisture, coolant or any
signs or damage. Photograph every
connector/header and advise TAC of
findings.
Note: Ensure all connector seals are
present/undamaged and remain attached to
the harness side connector.
Passed Examples
Refer to Figure 8
Failed Heavy Soot
Examples: Refer to
Figure 9
Failed Light Soot
Examples: Refer to
Figure 10
Pass
Fail
Pictures Captured/Submitted
Remove the HV battery pressure equalizer
vent and inspection plug (if equipped).
Insert a cotton swab as an aid to detecting
moisture/coolant. Photograph and advise
TAC of findings.
Passed Example
Refer to Figure 11
On some vehicles the
pressure equalizer vent
is accessible prior to
battery pack removal.
Failed Example
Refer to Figure 12
Pass
Fail
Pictures Captured/Submitted
Hybrid/Electric Vehicle Battery Pack Replacement and Shipping Preparation Remove coolant
from the HV battery internal coolant circuit.
Pass
Fail
Pictures Captured/Submitted
Hybrid Battery Pack Coolant Passage Leak
Test. Inspect coolant passage for leaks,
should maintain 20 inches of vacuum for 2
minutes. Photograph and advise TAC of
findings.
Passed Example
Refer to Figure 13
Failed Example
Refer to Figure 14
Pass
Fail
Pictures Captured/Submitted
Hybrid Battery Pack Coolant Passage Leak
Test.
Inspect coolant passage for leaks, should
maintain 5 psi of pressure for 2 minutes.
Photograph and advise TAC of findings.
Note: ONLY PERFORM PRESSURE TEST
IF VACUUM TEST WAS PASSED
Passed Example
Refer to Figure 15
Failed Example
Refer to Figure 16
Pass
Fail
Pictures Captured/Submitted
Stable to Ship determination
RESULTS
If moisture/coolant/soot was detected at the HV connectors the HV battery is NOT STABLE.
If moisture/coolant/soot is detected at the equalizer vent and/or inspection plug the HV battery is
NOT STABLE.
NOT STABLE
STABLE
Immediately Place the HV battery in the provided DDR Crate (if
available) and move to a stable location outdoors, away from
buildings, vehicles and foot traffic. Cover the HV battery or DDR crate
with a tarp. Photograph location and immediately advise TAC.
Place the HV battery in the provided DDR crate. Advise
TAC of the results and request the core return process.
Page 6
December, 2024
Bulletin No.: 23-NA-151
Figure 1 (Coolant Level - Passed)
6715474
Figure 2 (Coolant Level - Failed)
6715476
Bulletin No.: 23-NA-151
December, 2024
Page 7
Figure 3 (GDS2 Data Capture)
6715479
Figure 4 (Vehicle and Battery Pack
Isolation – Passed)
6715481
Page 8
December, 2024
Bulletin No.: 23-NA-151
6760498
Figure 5 (Vehicle and Battery Pack
Isolation – Failed)
6715482
Bulletin No.: 23-NA-151
December, 2024
Page 9
6760499
Figure 6 (High Voltage Disable
Result < 3V)
Passed
6715483
Page 10
December, 2024
Bulletin No.: 23-NA-151
Figure 7 (High Voltage Disable
Result > 3V)
Failed
6760500
Figure 8 (Battery Pack Connectors
– Passed)
6715486
Bulletin No.: 23-NA-151
December, 2024
Page 11
Figure 9 Battery Pack Connectors
– Failed w/Heavy Soot)
6715487
Figure 10 (Battery Pack
Connectors – Failed w/Light Soot)
6715488
Page 12
December, 2024
Bulletin No.: 23-NA-151
Figure 11 (Battery Pack Swab Test
– Passed)
6715489
Figure 12 (Battery Pack Swab Test
– Failed)
6715491
Bulletin No.: 23-NA-151
December, 2024
Page 13
6763180
6763181
Page 14
December, 2024
Bulletin No.: 23-NA-151
Figure 13 (Coolant Passage
Vacuum Leak Test – Passed)
6715492
Figure 14 (Coolant Passage
Vacuum Leak Test – Failed)
6715493
Bulletin No.: 23-NA-151
December, 2024
Page 15
Figure 15 (Coolant Passage
Pressure Leak Test – Passed)
6715494
Figure 16 (Coolant Passage
Pressure Leak Test – Failed)
6715495
Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following
labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor
Operation
Description
Labor Time
5080398*
Hybrid/EV Battery
Inspection & Transportability Assessment
1.0 hr
*This is a unique Labor Operation for bulletin use only.
Page 16
December, 2024
Bulletin No.: 23-NA-151
Version
11
Modified
Released September 05, 2023
Revised October 17, 2023 – Updated Model Years, Added Steps 8-12 and added
Warranty Information.
Revised January 16, 2024 – Added Illustrations, Updated Steps, 2022 Model Year Zevo
600 and 2024 Zevo 400.
Revised March 14, 2024 – Added Europe and Updated information throughout the entire
bulletin.
Revised May 23, 2024 – Added Equinox EV model, updated Involved Region or Country
and multiple steps under Service Procedure.
Revised June 04, 2024 – Added Warning and Adjusted Step 17.
Revised August 01, 2024 – Removing U22xx DTCs, adding P0AE3 and P0C78.
Rewording for alignment with service titles and naming.
Revision August 14, 2024 – Added Chart and 2025 Model Year.
Revision November 13, 2024 – Updated Entire Bulletin to aid in Printing and readability.
Revision November 20, 2024 – Added Cadillac Escalade IQ.
Revision December 10, 2024 – Added Cadillac Optiq and added “Passed” and “Failed” to
figure 6 and 7.
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: 23-NA-151
Replacement Service Bulletin Number:
MFR Communication Date: 2024-12-11
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: FUEL/PROPULSION SYSTEM
MFR Component System:
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