read recent treads on this done all of the above. disconnect battery
ect.. i tried changing the TCCM that did not work...fuse is good...all
connections are good...already replace 4wd vacuum actuator 1 monht ago
replace 3 line vacuum switch on trans fer case becuse it stuck open
and got fluid up to the vacuum diaphram which caused it to fail.. this
is a new thing. 4wd high works going into 4wd low and back fine.. no
codes when i depress the 2wd button it clicks at the tccm and at the
transfer case.but goes back to 4wd...i am thinking the encoder motor
is bad it has a halleffect in the motor that encodes the position of
the motor via 2wd 4wd high 4wd low. i do not think this is working...
 am i on the right track??