Code c140d and c140b truck won't shift into 4x4 intermittent. Service 4x4 light comes on.

The indicator lights may be working as they should to tell you when the 4x4 is engaged. However, a loose connection somewhere could do the same thing. Probably easiest to start by inspecting inside the "pod" for bad connections/bulbs/sockets.

4x4 light comes on and stays on does not engage in to 4x4

you cannot run your truck normally in 4x4 low!!!! the low is designed to go slow slow.try shifting into neutral gear on column tap the high 4x4 then shift to reverse,back up 15feet then shift to drive.it should go into high 4x4 then if you want to go back to 2wheel high shift to neutral tap the 4x4 high until the light goes off,shift to reverse and back up 15feet then shift to drive and the 4wheel drive lights should all be off. then you'll be in 2x2 rear wheel drive. thank you for choosing fixya.com

A blinking OD light means there is a problem with the electronically controlled transmission, you need the TCM module scanned for fault codes.

You will need to retrieve the codes from the transfer case module.This will help in finding out what is making the light come on.Hope this helps.Good luck.

Well you should have it scanned for codes.Se what is realy going on.I hear that autozone does it for frre.I'm sure that other parts houses do it as well.

I need the CODES this year has valve body problems for tcc slipping on these & shift timing need more information

you will need to scan for ABS code......possible a wheels speed sensor is bad....also this will effect the 4X4. and engine/trans....first start with diagnostics to correctly save time and money, this can be a complex system....hope this helps....GL

If you live in the US Take it into an Auto Zone store and they will read off the stored code for you , once you have this you can determine your next course of action.
Other Auto supply outlets may offer the same service.

Hope this is of some help.
Ed

mine had the same intermittent code it was my o2 sensor