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  1. C

    4WD issue. 99 Yukon.

    Lights flash when the truck starts but don't work after. It's stuck in 4WD high. New actuator, I had the TCCM out and back in. Today, the truck went into 4Wd low on its own while going through a parking lot. The lights stopped working. On the way home it shifted to high, but I can't change y...
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