2005 Suburban GMT800 NP246 Encoder Motor?

[redhat]

I had to put a rebuilt transfer case in the 2005 Suburban.

Weeks back, when I changed all fluids in the truck, the transfer case was about empty. I filled it back up with AutoTrak II, but the case was too far gone -- bearings felt horrible and the seals were leaking most of the fluid out.

Was pretty careful with the encoder motor, however, now when I shift it into 4HI, it by default goes to Auto 4WD. I cannot get it into 4HI. It will **** into 4LO no problem, as well as go back into 2WD. I don't ever recall the t-case having to stay in Auto 4WD.

Is the encoder bad? Or possibly the switch?

 

[AutoMechanic]

It sounds like something is definitely bad. Did you check either one yet?

 

[AndyB]

Working from memory here. I think some of those need to be “timed” to the transfer case when installed. The transfer case needs to be in a certain position and the encoder needs to be in a certain position so all the positions can be selected.

 

[clinebarger]

You will need to have the Transfer Case Module reprogramed so it will learn the new clutch pack position