For 1990-2009 cars

# Information on OnStar Destination Download Incomplete, Intermittent - Do NOT Replace Navigation Radio or OnStar Module

Subject: | Information on OnStar® Destination Download Incomplete, Intermittent -- Do NOT Replace Navigation Radio or OnStar® Module

Models: | 2009 Buick Enclave

| 2009 Cadillac CTS, Escalade, Escalade ESV

| 2009 Chevrolet Avalanche, Silverado, Suburban, Tahoe, Traverse

| 2009 GMC Acadia, Sierra, Yukon, Yukon XL

| 2009 Saturn OUTLOOK, VUE

| with OnStar® (RPO UE1) and Navigation Radio (RPOs U3R, UVB, U3U, UAV or UZR)

For the 2009 model years mentioned above, the "Directions and Connections" service package will allow the driver to request directions from OnStar®.

Vehicles equipped with OnStar® and a navigation radio may experience intermittent failure to download directions to the navigation radio. Customers will call OnStar® for directions., OnStar® will download the destination to the vehicle and the customer will hear "Your destination is being sent to your vehicle. When safe and appropriate, press the go button and follow instructions on your navigation screen to begin your route." However, the customer will not see the "Go" button on the navigation screen to start the directions.

1. This may be caused by the Navigation Disc being missing (applies to the Denso Navigation Radio System (RPO UVB or U3U) on the 2009 Chevrolet Avalanche, Silverado, Suburban, Tahoe and GMC Sierra, Yukon and Yukon XL).
2. This may be caused by an OnStar® module software anomaly. OnStar® destination download does not complete communicating to the navigation radio in a certain time frame.

Important: DO NOT replace the navigation radio.

DO NOT replace the OnStar® module at this time.

GM is aware of the condition and an updated OnStar® module is currently being released.

OnStar® Module part number replacements will be available in mid August 2008.

When these parts become available, this bulletin will be revised to reflect that information.