Hey Mark,
I recommend contacting your local BMW dealer in Seattle prior to taking your X5 to a non BMW mechanic in Bozeman. Explain the symptoms to your dealer and see what they recommend. It sounds like a fairly simple issue, however, you would need to read the fault codes to determine the actual problem. If there's an Autozone parts store nearby you may want to pick up a code scanner by Actron OBD II Auto scanner. The code scanner connects to your OBD II port located under the dash on driver's side. Once you determine the fault code start looking for a replacement part. Let us know we'll be glad to help you anyway we can.
Mike

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/ / / Mike
BMW X5 Xdrive50i 2015 F15
BMW 325iC 1992 E30
BMW X5 4.4i - sold
BMW 335i X Drive 2010 - sold
BMW Z4 3.0is 2006 - sold
BMW 325is 1993 - sold
BMW 2002 1976 - sold

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