23-NA-205

Bulletin No.:
Service Bulletin
Date:
23-NA-205
November, 2023
TECHNICAL
Subject:
Audio Boom or Drone Noise Caused by Active Noise Cancellation with RPO UQS
Brand:
Model:
Chevrolet
Corvette
Stingray
Model Year:
VIN:
from
to
from
to
2024
2024
—
—
Engine:
Transmission:
6.2L (LT2)
—
Involved Region or Country
North America, Europe, Middle East, Japan
Additional Options (RPOs)
Equipped with 10 Speaker Bose Audio System (RPO UQS)
Condition
Some customers may comment on one or more unwanted boom or drone noises in both
coupe and convertible Stingray 1LT models.
• Boom / drone noise during AFM (V4) operation.
• Boom / drone noise in Park between 1,500 and 2,000 engine RPM.
Note: This bulletin only apples to Corvettes with amplifier RPO UQS.
Cause
The cause of the condition may be that the wiring harness may have a different polarity
than the amplifier for the right front midrange speaker.
Correction
Verify the connector is working. Refer to the Service Procedure below.
Service Procedure
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
Copyright 2023 General Motors LLC. All Rights Reserved.
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.
1. Follow SI for Vehicle Performance Data Recorder
Bracket Replacement (Doc ID 5388184) to remove
the bracket covering the T3 radio speaker amplifier
in the passenger footwell.
2. Remove connector X2; location shown in Figure 1.
Page 2
November, 2023
Bulletin No.: 23-NA-205
Figure 1: T3 Amplifier Connector X2 (1)
6480012
3. Locate terminals two (1) and ten (2) in the X2
connector, as shown in Figure 2.
Bulletin No.: 23-NA-205
November, 2023
Page 3
Figure 2: T3 Connector X2 (in the as-built condition)
6480013
4. Use terminal removal tool J-38125-215A to swap
terminals 2 and 10 such that the brown with black
stripe wire will be in the upper cavity 2, and the
white with yellow stripe wire will be in the lower
cavity 10. Use SI Doc ID 6422077 if needed for
connector reference information.
Page 4
November, 2023
Bulletin No.: 23-NA-205
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
3488008*
Description
Labor Time
UQS Active Noise
Cancellation Polarity
Change
0.6 hr
*This is a unique Labor Operation for bulletin use only.
Version
1
Modified
Released November 15, 2023
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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