Sierra 1500 2WD V6-4.3L (2008)
Navigation System: All Technical Service Bulletins
Navigation Radio - Weak Or No GPS Signal Information
INFORMATION
Bulletin No.: 08-08-44-027
Date: August 12, 2008
Subject:
Information on Navigation Radios that Have a Weak or No GPS Signal
Models:
2007-2009 Cadillac Escalade Models
2007-2009 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2007-2009 GMC Sierra, Yukon Models
with Navigation Radios
Some customers may comment on intermittent or no Global Positioning System (GPS) signal reception on the Navigation radio. The GPS signal
reception icon on the map screen may have a red line through it.
This condition may be caused by aftermarket electronic devices such as radar detectors, cell phones, and MP3 players that may interfere with the GPS
signal reception. Aftermarket window tinting or clear UV film applied to the windshield may also reduce the GPS signal reception and cause the
Navigation radio to function incorrectly.
Recommendations
Educate the customer on the GPS antenna location and the need to keep electronic devices away from it. The GPS antenna is located in the upper center
of the Instrument Panel. Instruct the customer to move electronic devices away from the GPS antenna. It may also be necessary to remove aftermarket
films and tinting from the windshield.
Do not replace a Navigation radio that seems to have poor GPS signal reception without considering these possible causes of the concern. Refer to the
No Global Positioning System (GPS) Reception diagnostic procedure in SI for more information.
Disclaimer
