NHTSA ID Number: 10161953
Manufacturer Communication Number: 19NA106
TSB/Document Date: 2019-07-01
Summary
This Technical bulletin provides a Correction for a Condition of OnStar Red LED Illuminated - DTCs U18B4, U18B5, U18AF Set.
Service Bulletin
Bulletin No.:
19-NA-106
Date:
May, 2019
TECHNICAL
Subject:
OnStar Red LED Illuminated - DTCs U18B4, U18B5, U18AF Set
This Bulletin replaces PIC6326A. Please discard PIC6326A.
Model:
Sonic
Trax
Terrain
Model Year:
Breakpoint:
from
to
from
to
2018
2019
SOP
October
5, 2018
2018
2018
Engine:
All
All
Involved Region or Country
North America and N.A. Export Regions
Additional Options (RPOs)
Equipped with OnStar (UE1) and Infotainment System (IOR)
Condition
Some customers may comment that the OnStar LED is illuminated Red and will not
connect to OnStar except through emergency services.
Cycling the ignition off and disabling retained accessory power for at least 3 minutes will
restore operation. Diagnostic trouble codes (DTC) U18B4 and/or U18B5 will be stored in
the Telematics module and DTC U18AF may be stored in the radio.
Note: If the concern is not temporarily corrected when completing the ignition cycle
mentioned above, or there are other conditions experienced outside of those described in
the bulletin, then this bulletin DOES NOT apply.
Cause
Correction
Copyright 2019 General Motors
LLC. All Rights Reserved.
The cause of the condition may be a software anomaly.
Important: This bulletin ONLY applies to the OnStar condition described above. It is
possible for these DTCs to be found while diagnosing other conditions or concerns. DO
NOT stop diagnosis of other concerns if these DTCs are found.
Replace the A11 radio. Refer to Radio Replacement (IOR) in SI.
Page 2
May, 2019
Bulletin No.: 19-NA-106
Parts Information
Use the vehicle identification number (VIN) and the GM
Electronic Parts Catalog to determine the proper radio
to order. US/Canada dealers order through the
Electronic Service Center (ESC).
Causal
Part
Description
Part
Number
Qty
X
Radio Assembly
84610604
1
X
Radio Assembly
84610605
1
X
Radio Assembly
84667777
1
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
Description
Labor Time
3420840
Radio Replacement
Use
Published
Labor
Operation
Time
Version
1
Modified
Released May 13, 2019
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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TSB/Document ID: 19NA106
Replacement Service Bulletin Number:
MFR Communication Date: 2019-05-13
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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