Replace the IPC,very common problem.its not the stepper motor,I've never changed one,just replaced the IPC's in these vehicles.this has been an ongoing problem with these vehicles since 03.there is a special policy covering these for 7years 70,000 miles.might want to call the dealer,it might be out by mileage but might want to ask. This video will show you how to fix it.
https://youtu.be/_HEC44xENxw
Please run down this guide and report back.
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Thursday, December 10th, 2009 AT 8:00 PM