4WD SWITCH DOES NOT DESELECT 4WD LOW

It sounds like you are experiencing an issue with the 4WD system on your 2001 Chevrolet Blazer. Here are a few things you can try to troubleshoot the problem:

1. Check the fluid levels in the transfer case and the front and rear differentials. Low fluid levels can cause issues with the 4WD system.
2. Make sure that the front and rear driveshafts are properly connected and not damaged.
3. Inspect the 4WD control module and wiring for any damage or lose connections.
4. Check for any error codes using a diagnostic scan tool. This may help to identify any issues with the 4WD system.
5. If the issue persists, it may be necessary to have the 4WD system inspected and repaired by a professional mechanic.

I hope this helps! If you have any additional questions or need further assistance, don't hesitate to ask

no year car, and matters huge, 1993-2023 up.
they are not ALL the same
no country told
no engine size told or even gas and diesel.
4wd or 2wd, yes low range 4wd.
do not use the 4wd, with 4wd mode set to LOCKED on pavement
not told engine runs. ok, : guess#1 yes
car drives ok in 2wd, in all gears PRNDL, R, D and L????
car fails in 4wd only if yes, say so and tell what 4wd mode it is in
4wd full time 4wc, part time or 4wd lock mode.

sorry we can not guess year,. and 29 long years of evolution on this car, no YEAR told.
AWD called, ALL time 1999, and before that was Select track 1993 first one

did kids play with 4WD levers? seems so to me.
put it 2wd , and learn how to use 4wd later. (ASK),

Try replacing the motor on the back of the transfer case that engages high/low, which should fix the issue.

part time or awd ?
do no engage part time 4wd on dry pavement.!! only on ice or dirt.
do post what your tires are touching? dirt or pavement????????

if stuck in 4L , on dry pavement , pull over to side of road, dirt
then shift out. if no dirt anywhere? sand or gravel or grass.?
then jack up one wheel then deselect 4Low. back do 2WD
options for your car, (do post what you have)
qoute sales brochure:
Those going 4WD can enjoy the standard Command-Trac II, or opt for the Selec-Trac II, featuring full-time AWD, 4WD Lo and a rearward-biased torque split. (end quote)

how you drive both cars, varies greatly.
in your glove box is an operators guide , did you read that yet
under how to drive in 4wd or awd.??????????

Possible the vacuum bleed-off to the switch you installed isn't allowing it to completely disengage. Pull the bleed-off line from the new switch and see if it works. could be just a tight spot/bent closed in the bleed-off line or the vent plugged.

gm has had a lot of problems with the button switch on the dash id start there

by swapping vaccum hoses on front diff shift on fly unit you can get out of 4wd or vise versa or by removing and sliding sleeve ring inside diff tube over, check range selection detent switch on this unit it is a on/off switch.these fail often

it sounds like the motor on transfer case is bad .

I had a prolem with my 1998 Ford Explorer XLT. The 4wd indicator light would randomly start to blink while moving and when I flipped the switch to 4wd hi or low it would engage but easily disengage and the indicator lights would not come on. I was hearing a grinding sound coming from my hubs so I replaced both front hub assemblies and the light stopped blinking and 4wd hi/low works great now. it was about 300 bucks for the hub assemblies and only took me an hour or two to change.

Hi,

Try reversing for around 10 yards, then deselect 4WD.

Doing a few snake turns on soft ground may help too if it has wound up the transmission.

If this does not work, it may be a stuck solenoid.