NHTSA ID Number: 11031946
Manufacturer Communication Number: PIT6406G
TSB/Document Date: 2026-05-02
Summary
This Preliminary Information communicates direction for different audio issues with RPO UQA, UQF, UQS, or NKD
Bulletin No.: PIT6406G
Service Bulletin
Date: April, 2026
PRELIMINARY INFORMATION
Subject:
Brand:
Complete Audio Loss Through a Drive Cycle or Short Cuts in Audio
Model:
Model Year:
from
VIN:
to
from
to
Corvette
2024-2025
All
All
All
All
Chevrolet
Silverado
1500
2022-2026
All
All
All
All
Silverado
2500
2024-2026
All
All
All
All
Silverado
3500
2024-2026
All
All
All
All
Suburban
2022-2024
All
All
All
All
Tahoe
2022-2024
All
All
All
All
Sierra 1500
2022-2026
All
All
All
All
Sierra 2500
2024-2026
All
All
All
All
Sierra 3500
2024-2026
All
All
All
All
Yukon
2022-2024
All
All
All
All
Yukon XL
2022-2024
All
All
All
All
Involved Region or Country
GME, GMIO, GMNA, GMSA and Holden
Additional Options (RPO)
Equipped with IOK radio and RPO UQA, UQF, UQS, or NKD
Condition
Some customers may comment that they intermittently have no sound from any speaker
at times and no turn signal click clack through a drive cycle, or short cuts in audio
Cause
The cause of the condition may be hardware and software anomalies.
Correction
Service procedure:
1. Verify radio is at the latest software.
2. Once vehicle is at latest software refer to concern 1 or 2 based off customer complaint.
Concern 1- Short cuts in audio throughout the key cycle
1. If the customer concern is Short Cuts in Audio lasting 1-2 seconds throughout the key cycle. This is due to a
software anomaly. Do not replace the radio or amplifier.
Engineering is currently investigating, In the meantime please continue to drive your vehicle, The PI will be updated
or replaced with TSB once a determination has been made
Concern 2- Complete loss of audio throughout drive cycle (RPO: UQA ,UQS, and UQF with NKD only)
. For model year 2023 and 2024 UQA and UQS vehicles ONLY, verify the part number of the amplifier below via
GDS
Copyright 2026 General Motors
. All Rights Reserved.
Page 2
April, 2026
Bulletin No.: PIT6406G
2. For model year 2022, 2025, and 2026 vehicles with UQA, UQS, or UQF with NKD, proceed to step 2.
a. UQA: 85661488, 85661516, 86587284, 86587287
b. UQS: 85661494, 85661517, 86587285, 86587288
1.1 If PN matches above replace the amplifier and retest for concern.
If the concern of Loss of Audio Throughout Drive Cycle remains.
2. Verify No audio for the duration of the ignition cycle, but may return on the next key cycle and No turn signal “click
clack”
3. If the customer experiences this concern, please perform a global reset to the vehicle and audio should recover. If
audio recovers, this is due to a software anomaly. Do not replace the radio or the amplifier.
Engineering is currently investigating, In the meantime please continue to drive your vehicle, The PI will be updated
or replaced with TSB once a determination has been made
4. If audio does not recover, this is not a software issue refer to normal no audio or speaker malfunction SI
diagnostics
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
2810335
Reprogram Radio with
SPS
Use
Published
labor time
guide
*3481258
Verify amp part number
through GDS 2 MY23 and
24 vehicles only
0.3 Hr.
3421200
Amplifier replacement
Use
published
labor time
guide
*3481268
Verify Various audio
concerns in radio
0.2 Hr.
3481248
Perform Global Reset for
Loss of Audio and Audio
Returns
0.4 Hr.
*This is a unique Labor Operation for Bulletin use only.
Version
8
Modified
06/30/2025 - Created on replacing PIT6101 and PIT6367.
07/07/2025 - Updated to change correction.
10/06/2025 - Updated to add 2026 MY
10/31/2025 - Updated Models.
11/20/2025 - Updated to add to concern description and change concern 1 and concern
2 in correction
01/19/2026 - Updated to add 2026 model year in correction on step 1 of concern 2
03/09/2026 - Updated to remove 2026 Corvette
04/23/2026 - Updated to clarify correction section for no audio
Bulletin No.: PIT6406G
April, 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.
Page 3
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TSB/Document ID: PIT6406G
Replacement Service Bulletin Number:
MFR Communication Date: 2026-04-24
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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