My 2000 chevy blazer is stuck in 4lo any ideas what the problem is

Put truck in Neutral while key in run position engine off or on (doesn't matter which). If it's pushbutton 4wd then try hitting 4low again. if that doesn't work some of the chevy trucks required you to press 4hi to get into 4high and then press 4hi again to get back to 2hi, unless yours has a 2hi button. In that case press 4hi to get into 4high and then press 2hi to get back to 2wd. either way you need to be in neutral to get out of 4lo. I have shift on the fly (Mechanical Shifter on floorboard for transfer case) on my 1990 Suburban and still have to put it in neutral to get out of 4lo. Good Luck.

there is a electrical actuator on the transfere case that controls when you put in 4 wheel hi or 4 wheel lo and 2 wheel

check for vacum leakes. check the 4wd actuator located under th battery box. I uses vacum to pull in and out of 4wd

Must put truck in PARK to switch to and from 4Low

you will have to put it on a scanner to check the code

your high low range shift solenoid is out!! change it!

Likely either a shifter position sensor, transmission position sensor, or a differential position sensor. Had same issue w/ my Montero and it ended up being one of the 5 sensors on the transfer case. It was pretty tough to get to, so replaced all 5. That fixed it.

check for power too the accuater, or even a bad one

pull atc 25 amp fuse in underhood fuse center and 10 amp 4wd fuse inside cars fuse box,your problem is in control box behind kick panel on pass. side ,corrosion build up,

try reverse and push the button