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2006 Toyota Tundra 4WD Truck - 4WD is a no-go

wont go into 4 wheel dr.light flashes on button

How often do you put it in 4WD?

I have been told if you don’t use it, it will get stuck. This happen to a Discovery Series One center diff lock.

The 4wd actuator is probably stuck, possibly from internal corrosion. If possible, whack it with a rubber mallet and see if the light goes out. If it does, you’ve found the problem.