I have a 1997 Blazer 4x4. I must say that I'm not real fond of the
electronic pushbutton drive selector. We had a little snow this past week,
and now my Blazer is stuck in four wheel drive. It will shift from 4hi to
4low with no problem, but it will not go back into 2hi. When I push the
button, the light flashes on the dash, and if I open the door, I can hear a
clicking sound under the vehicle, like it's trying to work, but it refuses
to drop out of four wheel drive. In the past, it's been stubborn at times,
but it's been stuck now for 2 days. My 2000 ZR2 went back to the dealer 3
times while I was leasing it with this same problem. With the pickup, it
was under warranty. On my Blazer, no such luck.
Is there an easy fix for this?
What should I expect to pay to have this repaired?
Probably not....but maybe you can try a few things.
Start by seeing if there are any codes in the t/case
module. Turn off the key, ground pin 13 at the
scan tool connector under the dash (pin 13 should
be 5th pin over from the left, bottom row), turn
the ignition back on again, check the t/case dash
switch lights...they will flash a sequence of lights.
Most common code I've seen is 2. 1-4 is
all that you will see.
If you get a code, write it down...or remember it.
Now clear the memory of the t/case module.
Turn off the ignition switch, remove the 10 amp
CTSY LP fuse from the fuse panel...this should
be on the side of dash when you open the drivers
door up. You "must" wait at least 60 seconds before
you re-install the fuse. Once you have re-installed
the fuse, you then must cycle the ignition switch
on and then back off 5 times. This clears the memory
of the t/case module. See if you can get the
correct shifting now.
If that doesn't work...you may need an encoder
motor. I'd also be suspicious of the front axle too.
It's also possible that for whatever reason, the
t/case module is not seeing the front axle
disconnecting, so it can't complete the shift
into 2WD. When you shift into 4wd, the transfer
case is shifted mechanically, and the front axle
is engaged by a vacuum motor. The front axle
has a switch that tells the t/case module that
it is in fact engaged, which is what turns the
4wd light on.
This is what was wrong with the 2000 ZR2 that I had. They replaced that
encoder motor two times for me, I believe. My wife was able to get the
thing out of 4x4... We've found that if the truck is going over bumps, it
helps it to disengage. She pulled up onto a curb and then pushed the button
and drove off to bump the it around a bit. It seemed to work after the 3rd
try. If this is the route I have to go, what is a fair price for this? Is
this something that must be done by a dealer?
If this were the case, would the truck say 4hi but really be in 2hi? Or
would it force it to shift back into 4hi? The blazer is definately still in
4hi, as is apparent while trying to drive/park. If this is the case, what
would I expect to be told it will cost to fix?
The blazer has another issue... My wife just informed me that it's been
occasionally hard to start, and stumbling/stalling lately, and the dash
lights will come on (air bag, abs, etc...). It's an automatic, so it's not
like she's stalling it. I had the fuel module replaced last year in
January. The year warranty on the replacement is almost up. It was
replaced out of town, since we weren't home when the fuel pump failed. Does
this sound like a fuel pump problem or some other electrical issue? The
dash lights are confusing me. I want to be reasonably certain that this
problem could be fuel pump related before I drive an hour back to the
dealership who did the work last year.
If your wife was able to get it out of 4hi...you
may want to check your tire pressures. Are
they all even? Often, if tire pressures are not
even on a 4x4....you can get driveline binding
while in 4hi which makes it almost impossible
to get out of 4hi. Generally, by going between
reverse and drive...and/or disengaging while
you are on a slippery surface while get you out
of 4hi if the driveline is binding.
Encoder motors are "expensive". Up here in
Canada, they are close to 1000 dollars retail.
Best be sure that that is problem before you
go either installing one, or having one installed.
The encoder motor will not complete the shift if
the conditions aren't met. So it's either unable to
complete the shift at the t/case, or it's not seeing
the front axle disengaging and is unable to complete
Hard to say on this one.....this is not my area of expertise. A person
would want to determine if the dash lights coming on is a separate
problem, or is it just related to the stalling condition....ie: the engine
is quitting causing all the lights to come on.
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