Q: service 4 x 4 light on 2012 ram

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Hello, In the past my service 4 x 4 light would come on every now and then. the 4 x 4 doesn't work when it is on. I could shut my truck off and start it again and the light went away, and the 4 x 4 works. Now the light is on all the time, and 4 x 4 doesn't work. I checked for codes with my scanner, but there are none. I'm thinking it's a control module, or transfer case motor, but I don't want to just start buying parts. Any ideas?

My car has 134000 miles.
My car has an automatic transmission.

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