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Discussion Starter #1
I was driving about 15 mph and switched from 4hi to 2hi. There was a loud "cluck" and lights began flashing followed by "service 4wd" on display. Now the lights are out and nothing happens when I hit buttons. The lights come on when I start my truck but then go off. Suggestions?
 

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disconnect the battery for about 15 min and see what happens. I'm pretty sure when switching from 4X4 to 2X4 or vise versa it should be under 4 mph or better yet parked or neutral
 

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I guess just try the battery. Our BCM gets confused a LOT and it needs a little 'reboot' if you will.

Nothing wrong with shifting the way you did -it's just an odd quirk. Or the actuator may be failing. There are a few little complications with 4x4 from time to time on these trucks. I heard the service warning message complaint fairly often.
 

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I would get under the truck and give the front wheel drive shaft a good inspection and also check cv axles. Should be no loud clunk when switching from 4hi to 2hi at any speed
 

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disconnect the battery for about 15 min and see what happens. I'm pretty sure when switching from 4X4 to 2X4 or vise versa it should be under 4 mph or better yet parked or neutral
You can shift into 4 wheel high under 50 mph. ( shift on the fly) I'm trying to find it in the owners manual, with no luck. Most times I shift into or out of 4 wheel high, I am going at least 25. You can't drive around and make sharp turns in 4 wheel high on dry roads. That's bad. Even just a wet road isn't good. Snow is GREAT! Mud is Great! I have shifted on the highway, going into snow storms at 45mph. Everything still works fine at 90,000 miles.
 

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Discussion Starter #8
I have had the battery unhooked for 24 hours and no luck. Where exactly is the actuator?

I guess just try the battery. Our BCM gets confused a LOT and it needs a little 'reboot' if you will.

Nothing wrong with shifting the way you did -it's just an odd quirk. Or the actuator may be failing. There are a few little complications with 4x4 from time to time on these trucks. I heard the service warning message complaint fairly often.
 

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I doubt it's the actuator. .. but located on the front differential it will have wire harness coming out of it. A simple Google search will tell you where to look.

That fact that it made a clunk noise going from 4hi to 2hi is bad. What kind of surface were you driving on in 4hi?
 

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Discussion Starter #10
I was driving on a gravel road. any other suggestions?

I doubt it's the actuator. .. but located on the front differential it will have wire harness coming out of it. A simple Google search will tell you where to look.

That fact that it made a clunk noise going from 4hi to 2hi is bad. What kind of surface were you driving on in 4hi?
 

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Did you have a look at the front drive shaft and cv axles?
 

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Does it drive in 2wd? If yes any noises?
 

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Well if the cv axles and drive shaft look fine and it won't go into 4hi or 4lo then I'm guessing something internal has broken in transfer case and/or front differential.
 
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