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Generally the service 4 wd soon or service trans soon would come on before service engine soon. Sounds independent from trans issue.....maybe two issues. Try using a code reader.....autozone will do this for free for you. FYI.....same thing happened to me. Took the SUV in and had 1700 dollars...

More than likely it is not the system....maybe a loose connection.....the check engine light would come on if an issue.

NAPA stocks them......very common issue.

Need a Tech 2 to source the issue. Generally a dealership has to do this. The Transfer case computer module will only communicate with a tech 2. Sometimes the tccm has to be re-programmed, if not then it’s something mechanically malfuntioning like the actuator or the transfer case motor. It’s...