PI0345C

File in Section:
Service Bulletin
Bulletin No.:
Date:
PI0345C
June, 2013
PRELIMINARY INFORMATION
Subject:
Inspect XM/Cellular Mobile Phone/OnStar® Antenna for Looseness or Damage, XM/
Cellular/OnStar® Reception Performance Degraded, Rattle/Flutter/Squeak Noise, Wind
Noise/Whistle at Highway Speeds, Water Leak on Headliner at Sunvisor
Models:
2010-2014 Cadillac Escalade Models
2010-2013 Chevrolet Avalanche, Silverado LD Models
2010-2014 Chevrolet Silverado HD, Suburban, Tahoe
2010-2013 GMC Sierra LD Models
2010-2014 GMC Sierra HD Models, Yukon Models
This PI is being revised to add the 2014 model year and update the Warranty Information.
Please discard PI0345B.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
Some customers may comment on finding any of the conditions noted below:
• Poor reception or degraded performance of XM, cellular mobile phone, and/or OnStar® in some geographic
areas.
• Rattle/squeak noise, and/or a whistle/flutter wind noise at highway speeds, which may appear most evident
near the left middle or rear of the headliner.
• Water leak on headliner above the driver's seat and/or on the floor in the driver's area.
The cause of this condition may be looseness and/or damage of the XM/cellular mobile phone/OnStar® antenna,
which may affect the grounding of the antenna and may allow a rattle/wind noise at highway speeds and/or a
water leak.
2555896
Though difficult to detect evidence of impact damage, upon inspection of the antennas returned in warranty, there is
a likelihood this damage occurred during vehicle transportation to dealerships. The result of impact damage is most
often to the underside retainer (1), which is found to be bent backward or otherwise damaged and no longer provides
proper retention.
Recommendation/Instructions
Inspect new vehicles right after receipt from the vehicle carrier. Process transportation claims as appropriate.
2555891
Grasp and physically inspect the XM, cellular mobile phone, and/or OnStar® antenna for looseness and/or damage.
If the antenna is mounted securely and exhibits no signs of physical damage, follow regular diagnostic information in
SI to address any customer concern.
If the antenna is loose or damaged, it must be replaced. Refer to Cellular Communications/Digital Radio Antenna
Replacement in SI.
Parts Information
Part Number
Description
Qty
25815079
ANTENNA ASM-DIGITAL RDO &
M/TEL & VEH LOCC (2010 MY)
1
20850446
ANTENNA ASM-M/TEL & VEH
LOC (2010 MY)
1
20849992
ANTENNA ASM-M/TEL & VEH
LOC (2011–14 MY)
1
20791465
ANTENNA ASM-DIGITAL RDO &
M/TEL & VEH LOCC (2011–
14 MY)
1
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
3422580
Description
Mobile Telephone Digital
Antenna Replacement
Labor
Time
Use
Published
Labor
Operation
Time