06 yuon 4x4 will not shift into 3rd or 4th gear could it be a sensor
Answer
I suppose it could be, but I don't know which one. If you are not getting any codes (check engine light) then the only likely culprit is the ECM. I am assuming that there is not a fluid leak, of course. You are going to have to get a tech to scan the ECM and look for the problem.
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