NHTSA ID Number: 11028700
Manufacturer Communication Number: PIT6483
TSB/Document Date: 2026-02-11
Summary
This preliminary information communicates an issue with aftermarket LED headlights causing IPC warning messages and MIL along with several low speed lan DTCs.
Bulletin No.: PIT6483
Service Bulletin
Date: February, 2026
PRELIMINARY INFORMATION
Subject:
Brand:
IPC Gauges Drop Out / Flicker / Sweep / Several Warning Messages / Low
Speed Lan DTC U0078 U0140
Model:
Model Year:
from
VIN:
to
from
Engine:
to
Escalade
2015-2020
All
All
All
All
Escalade
ESV
2015-2020
All
All
All
All
Silverado
1500
2014-2021
All
All
All
All
Silverado
1500 LTD
(RPO J21,
VIN Digit 5
= W or Y)
2022
All
All
All
All
Silverado
2500
2015-2023
All
All
All
All
Silverado
3500
2015-2023
All
All
All
All
Suburban
2015-2020
All
All
All
All
Tahoe
2015-2020
All
All
All
All
Sierra 1500
2014-2021
All
All
All
All
Sierra 1500
2022
Limited (RPO
J21, VIN Digit
5 = 8 or 9)
All
All
All
All
Sierra 2500
2015-2023
All
All
All
All
Sierra 3500
2015-2023
All
All
All
All
Yukon
2015-2020
All
All
All
All
Yukon XL
2015-2020
All
All
All
All
Involved Region or Country
North America
Some customers may report one or more of the following concerns:
• IPC gauges flicker, jump, drop out, or sweep
• Multiple IPC warning messages or indicators, such as:
- Service Stabilitrak
Condition
- Service Side Object Detection
- Service Steering Column
- Service Park Assist
- Service Trailer Brake System
- Service Tire Pressure Monitoring System
Copyright 2026 General Motors
. All Rights Reserved.
Page 2
February, 2026
Bulletin No.: PIT6483
- Service Restraint System
• IPC PRNDL display intermittently turning on and off
• Headlamps, exterior lighting, and/or interior backlighting cycling on and off
• Backup/Reverse camera image appears fuzzy
These symptoms typically occur within the first minute after starting the vehicle. In some
cases, there may or may not be a correlation with the headlamps being turned on or off.
In all cases, multiple modules will set DTC U0140 (Loss of Communication with BCM).
Additional DTCs that may or may not be present include: U0078, B2575, B2699, B3135,
B3883, U0151, U0155, U0170, B3130, or other low-speed LAN communication-related
DTCs.
Cause
These conditions may be caused by the installation of aftermarket LED headlamps. Due
to the wide variety of aftermarket LED headlamp designs, the example shown below is
provided for reference only.
7074045
Correction
Disconnect the aftermarket headlamps and retest the vehicle. If normal operation is restored, install the original
factory light bulbs.
Warranty Information
Concerns caused by aftermarket devices are not covered under warranty and any repairs are the customer’s
responsibility.
Version
1
Modified
02/04/2026 Created on
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: PIT6483
Replacement Service Bulletin Number:
MFR Communication Date: 2026-02-05
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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