Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2003-2006 GMC Yukon/Yukon XL.

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  2003-2006 GMC Yukon/Yukon XL

• OnStar is unable to configure the vehicle after the OnStar 15-08-44-001 upgrade; OnStar receives a 118 error when attempting to configure the vehicle.

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  Dealers may report that OnStar is unable to configure the vehicle after the OnStar 15-08-44-001 upgrade. OnStar receives a 118 error when attempting to configure the vehicle.

• Related symptoms: OnStar unable to download Turn By Turn directions, OnStar Data Services inoperative (remote unlock, flash lights, etc), and long connect times to OnStar.

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  OnStar unable to Download Turn By Turn directions • OnStar Data Services inoperative (remote unlock, flash lights, etc) • Long connect times when attempting to connect to OnStar

Possible causes

• This occurs because the new module is not connecting to the preferred network.

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  This occurs because the new module is not connecting to the preferred network.

Repair

1. After talking to OnStar through the blue button, leave the vehicle powered up for 10 minutes for the cellular network to update.

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   After talking to OnStar through the blue button, leave the vehicle powered up for 10 minutes for the cellular network to update.

2. Turn off the vehicle and cancel RAP by opening the driver door.

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   Turn off the vehicle. 3. Cancel RAP (open the driver door).

3. Disconnect the vehicle battery, wait for 5 minutes, then reconnect it.

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   Disconnect the vehicle battery. 5. Wait for 5 minutes. 6. Reconnect the vehicle battery.

4. Press the blue button again to contact an advisor and attempt another configuration.

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   Press the blue button again to contact an advisor and attempt another configuration.

5. If the vehicle is already in a metro area and still has the concern, it may be necessary to drive it 2 Kilometers in each direction of the dealer so the OnStar system can connect to a tower and establish a Packet Data connection.

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   If the vehicle is already in a metro area and exhibits this concern, it may be necessary to drive the vehicle 2 Kilometers in each direction of the dealer to allow the OnStar system to connect to a tower and establish a Packet Data connection.

6. If Packet Data still cannot be established, install the OnStar test antenna and retest after letting the vehicle run outside for 5 minutes.

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   If packet Data still cannot be established, install the OnStar test antenna and retest operation after letting the vehicle run outside for 5 minutes.