My 2000 chevy blazer is stuck in 4lo we put it on a diagnostic tester it said transfe case modular i replaced that didnt work so i replaced the switch in dashboard still didnt work what to do now?

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

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

Try putting the transmission in neutral first then shift the 4wd switch up to 4 hi then 2wd..This usually works.You should have the codes in the transfer case control module checked.You might have a problem in the encoder motor or TCCM.Hope this helps.Good luck.

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.

sounds like it's the motor is going bad or has a bad connection, try cleaning the connector if there isn't any gunk in the connector, check the manual see if there is a ohmn test you can run on the motor, if not i'd replace the motor.

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

These have a problem with grounds, i run a ground from my frame to transfer case