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This information applies to the following vehicles with UE1 and UPF:

2008-09 CTS, CTS-V

2009 Allure, Enclave, Lacrosse, Lucerne, DTS, Escalade, SRX, STS, XLR, Cobalt, Corvette, Equinox, HHR, Impala, Malibu, Silverado, Suburban, Tahoe, TrailBlazer, Traverse, Acadia, Envoy, Sierra, Yukon, H2, H3, G5, G6, Solstice, Torrent, 9-3, 9-7x, Aura, Outlook, Sky, Vue.

Customers may report various issues when trying to use an Apple iPhone with the embedded Bluetooth system that is part of the GEN8 OnStar system. They may state that the system had been working properly and recently developed the issue.

DO NOT replace the radio or OnStar VCIM for this condition.

An issue has been identified with the Apple iPhone software version 2.1 released September 12, 2008. The customer would have received this software update upon connecting to iTunes and saying "yes" to the update after 9/12/08. This may cause such issues as inability to hear incoming/outgoing calls, or dropped calls while using the Bluetooth.

The investigation is ongoing.

- Thanks to Jim Loomis
December 2008 issue of TechLink.