there are alot of variables for bluetooth. Type of phone, phone service and provider etc... what type of phone are you using here is just one of the latest post from gm.
#PIC5504: Intermittent Bluetooth Issues With Apple IPhone 4 - (Jul 13, 2011)
Subject:
Intermittent Bluetooth Issues With Apple iPhone 4
Models:
2008-2011 All GM Passenger Car and Light Duty Trucks with RPO (UPF or UWE)
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:A customer may report of intermittent Bluetooth issues with their Apple iPhone 4.
Recommendation/Instructions:An issue with intermittent Bluetooth disconnects between the iPhone 4 and some GM vehicles has been identified. You may experience no audio in the vehicle for incoming and outgoing calls. When this occurs the Bluetooth system will say "Unable to place call on your Bluetooth phone". GM and Apple engineering groups are currently working on a resolution. The PI and GM Bluetooth website will be updated as soon as more information becomes available.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
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