16NA356

File in Section:
Bulletin No.:
Service Bulletin
Date:
16-NA-356
October, 2016
TECHNICAL
Subject:
Audio Muting When Listening to Some Sirius XM Channels Due to Interference in Some
Geographic Locations
Brand:
Model:
Buick
Cadillac
Chevrolet
GMC
All GM
Passenger
Cars and
Trucks
Model Year:
VIN:
from
to
2009
2017
from
Engine:
Transmission:
All
All
to
Involved Region or Country
North America
Additional Options (RPO)
Equipped with Sirius XM Radio
Condition
Some customers may comment on the audio muting when listening to some Sirius XM
channels, but if they change channels they will find others that experience normal audio.
They may also comment that the concern appears to happen in some geographic
locations but not others. If they experience this concern, they should continue to listen to
the currently tuned channel and observe if the condition clears after approximately 1.6 km
(1 mile).
Cause
This may be the result of interference from transmitting sources outside of Sirius XM’s
frequency range.
Correction
If you encounter a vehicle with the above concern,
check the vehicle for any codes and repair them as
necessary.
If no codes are present and the customer is
experiencing muting at the dealer’s location, compare
the Sirius XM audio performance with another like
vehicle (same year, model, radio RPO) while parked
side by side with a clear view of the sky and tuning to
several of the same Sirius XM stations. This
comparison is very critical to ensure that unnecessary
repairs are not made to the vehicle.
If the like vehicle does not experience a loss of Sirius
XM audio during this side by side comparison, it is
unlikely that the customer’s concern is a result of
interference described above so the technician should
follow SI diagnostics and repair as necessary.
Copyright 2016 General Motors LLC. All Rights Reserved.
If the like vehicle exhibits the same concern as the
customer’s vehicle during this comparison, no repairs
should be performed at this time because it is most
likely a result of interference from transmitting sources
outside of Sirius XM’s frequency range. Interference
from these sources tend to affect certain channels and
vehicles more than others. GM, Sirius XM, and a
third-party are working to understand these sources. In
some geographic locations, this concern has been
reported to last less than one month. Once this
third-party transmitting source was eliminated in that
geographic location, normal XM audio was restored.
If this concern is encountered, please document the
location of the muting event and direction of travel from
the customer, then contact the SiriusXM Dealer
Support team at 855-754-6271 to report this
information.
Page 2
October, 2016
Bulletin No.: 16-NA-356
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
Description
Labor Time
2881148*
Sirius XM Audio Evaluation
and Scan for Codes
0.4 hr
*This is a unique Labor Operation for Bulletin use only.
Version
1
Modified
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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