18NA134

File in Section:
Service Bulletin
-
Bulletin No.:
18-NA-134
Date:
May, 2018
TECHNICAL
Subject:
Brand:
Audio Muting When Listening to Some Sirius XM Channels Due to Interference in Some
Geographic Locations
Model:
Model Year:
VIN:
from
to
from
to
2018
2018
SOP
Feb. 1, 2018
Engine:
Transmission:
All
All
Enclave
Encore
Buick
Envision
Lacrosse
Regal
Cadillac
Escalade
Models
XT5
Camaro
Colorado
Corvette
Cruze (GenII
- VIN B)
Equinox
Impala
Chevrolet
Malibu
Silverado
Models
Suburban
Models
Tahoe
Models
Traverse
Volt
Acadia
Models
Canyon
GMC
Sierra
Models
Terrain
Yukon
Models
Copyright 2018 General Motors LLC. All Rights Reserved.
Page 2
May, 2018
Bulletin No.: 18-NA-134
Involved Region or Country
North America
Additional Options (RPO)
IO5, IO6
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.
If you encounter a vehicle with the above concern, answer the following questions to
ensure that this bulletin applies:
• Are any related Diagnostic Trouble Codes (DTCs) present?
• Is AM/FM reception lost in the same location as well?
• Do all XM stations lose audio during the concern?
• Is there anything preventing a clear view of the sky when this is happening (trees,
bridges, tall buildings, etc.) that could be interfering with the XM signal?
• Is there any sign of a water leak below the antenna area (ie. Headliner or sun visor)?
• Does this concern happen all of the time regardless of the geographic location?
If the answer to ANY question above is YES, this bulletin does not apply so normal
diagnosis should be followed instead.
If the concern is occurring as a result of trees, bridges, overpasses, etc., this bulletin does
not apply and will not help with the concern.
If the answer to ALL of the questions above is NO, use the GDS2 scan tool to determine
the radio part number in the vehicle by following this path:
• build vehicle
• module diagnostics
• radio
• identification information
• end model part number parameter
Correction
⇒ If the first four digits of the radio part number is 8435 or lower, replace the
radio.
⇒ If the first four digits of the radio part number is 8436 or greater, this bulletin
does not apply so normal diagnosis should be followed instead.
Warranty Information
Parts Information
Note: Refer to the GM Electronic Parts Catalog (EPC)
with vehicle identification number (VIN) to determine
the latest part number for the radio receiver listed.
Replacement radio part numbers that start with 8436 or
greater contain enhancements to reduce the XM muting
instances described above.
Causal
Part
Description
Part
Number
Qty
x
RADIO,
RECEIVER
Refer
to EPC
1
Version
1
Modified
Released April 26, 2018
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
3420840
Radio Replacement
Use the
Published
Labor
Operations
Time
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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