Bulletin No.: PIT6406

Service Bulletin

Date: June, 2025

PRELIMINARY INFORMATION
Subject:
Brand:

Complete Audio Loss Through a Drive Cycle or Short Cuts in Audio
Model:

Model Year:
from

VIN:
to

from

Engine:

Transmission:

to

Chevrolet

Silverado
1500

2022-2025

All

All

All

All

Chevrolet

Silverado
2500

2024-2025

All

All

All

All

Chevrolet

Silverado
3500

2024-2025

All

All

All

All

Chevrolet

Suburban

2022-2024

All

All

All

All

Chevrolet

Tahoe

2022-2024

All

All

All

All

GMC

Sierra 1500

2022-2025

All

All

All

All

GMC

Sierra 2500

2024-2025

All

All

All

All

GMC

Sierra 3500

2024-2025

All

All

All

All

GMC

Yukon

2022-2024

All

All

All

All

GMC

Yukon XL

2022-2024

All

All

All

All

Involved Region or Country

GME, GMIO, GMNA, GMSA and Holden

Additional Options (RPO)

Equipped with RPO UQA, UQF, UQS, or NKD

Condition

Some customers may comment that they intermittently have no audio 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-Complete loss of audio throughout drive cycle (RPO: UQA ,UQS, and UQF with NKD only)
1. For model year 23 and 24 UQA and UQS vehicles ONLY, verify the part number of the amplifier below via GDS 2.
For model year 22 and 25 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 and , replace amplifier. 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”

Copyright 2025 General Motors. All Rights Reserved.

Page 2

June, 2025

Bulletin No.: PIT6406

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.
4. If audio does not recover, please refer to SI diagnostics.
Concern 2: Short cuts in audio throughout the key cycle
1. If the customer concern is Short Cuts in Audio throughout the key cycle. This is due to a software anomaly. Do not
replace the radio or amplifier.
Engineering is aware of the issues and investigating.

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

1

Modified

Created on 6/30/2025 replacing PIT6101 and PIT6367.

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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