NHTSA ID Number: 11023158
Manufacturer Communication Number: PIT6424B
TSB/Document Date: 2025-09-17
Summary
A vehicle may come in with B3A6B set in history. Tech is directed to clear code and advise the customer an OTA will be released for the code.
Bulletin No.: PIT6424B
Service Bulletin
Date: September, 2025
PRELIMINARY INFORMATION
Subject:
Brand:
Service High Voltage Message With DTC B3A6B
Model:
Model Year:
from
VIN:
to
from
Engine:
to
CELISTIQ
2025
ALL
ALL
BEV
ALL
ESCALADE
IQ
2025-2026
ALL
ALL
BEV
ALL
ESCALADE
IQL
2026
ALL
ALL
BEV
ALL
LYRIQ
2023-2026
ALL
ALL
BEV
ALL
OPTIQ
2025
ALL
ALL
BEV
ALL
VISTIQ
2026
ALL
ALL
BEV
ALL
Blazer EV
2024-2025
ALL
ALL
BEV
ALL
Brightdrop
400
2024-2025
ALL
ALL
EV LCV
ALL
Brightdrop
600
2024-2025
ALL
ALL
EV LCV
ALL
Equinox EV
2024-2025
ALL
ALL
BEV
ALL
Silverado EV
2024-2026
ALL
ALL
BEV Truck
ALL
2024-2026
ALL
ALL
BEV
ALL
2024-2026
ALL
ALL
BEV
ALL
Sierra EV
2024-2026
ALL
ALL
BEV Truck
ALL
Involved Region or Country
North America and Export Regions
Condition
A customer may bring a vehicle in for a Service High Voltage message.
On inspection DTC B3A6B will be found.
Cause
Software anomaly
Correction
Verify code B3A6B is set in history.
Clear code.
Using GDS2 go into BECM>Identification Information>Identification Information>Application Software Part Number 1
Look for the software ID below:
2023 = 24074886 AA
2024 = 24074099 AA
2025 = 24073330 AA
Copyright 2025 General Motors
. All Rights Reserved.
Page 2
September, 2025
Bulletin No.: PIT6424B
2025 =24073938 AA
2026 = 24072901 BB
2026 = 24074550 BC
If the Software shown above is NOT installed and after clearing the code it does NOT reset, advise the customer
that an update to resolve this concern will be released in a future Over The Air (OTA) update and do not attempt any
repairs at this time.
If the updated software has already been installed follow SI diagnostics for B3A6B.
Version
3
Modified
08/20/2025 Created on
09/05/2025 Updates to the correction
09/10/2025- Corrected VISTIQ model year from 2025 to 2026
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: PIT6424B
Replacement Service Bulletin Number:
MFR Communication Date: 2025-09-10
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
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