I have the push button shifter on my 2002. it went into 4wdH no problem but when I tried 2wd it blinked 2wd then back to 4wd and I could hear it click in the dash but it stayed in 4wd. When it warmed up it went into 2wd no problem. There is no noise from the front end at all, no clunk or grinding.I tried shifting out at a stop shifting from drive to reverse.This happens every time now. Is this due to cold weather or what. This has just started and this has happened both days I used 4wd. Can cold weather affect it? I havn't tried it when warmed up to see if it acts up again.Any harm in leaving it in 4wd in mixed driving, highway and around town? By the way no codes flashing at all

I checked today for pump rub, no problem. I also checked the ground connection on the driver's side frame and thats good too. Anyone know what kind of voltage to check at the transfercase or have any other ideas?