4x4 works in Low, but no High

200k1993Blazer · 11-22-2005, 11:20 PM

1996 Jimmy,4x4, the 4x4 will work in Low but if I try to put it in High, the light flashes for a few seconds and then nothing. Any ideas..?

Upsetta666 · 11-22-2005, 11:23 PM

Either the encoder motor is bad or there is a 3 port vacuum switch on the transfer case that goes bad. I would try the vacuum switch first, since it's the cheaper of the two.

elburrito · 11-22-2005, 11:27 PM

Quote: Originally Posted by 200k1993Blazer

1996 Jimmy,4x4, the 4x4 will work in Low but if I try to put it in High, the light flashes for a few seconds and then nothing. Any ideas..?

I got mine stuck in low once, not sure if you have the same shift motor as me, but I just took the plastic housing off to have a look, couldn't do anything with it, put the cover back on and it worked ever since, guess it got stuck.

osheimer55 · 03-18-2009, 10:52 PM

Ok, im going to ressurect this post, because im having the same problem. Only my truck is a 91 S-10. When I put it in 4H it doesnt work, but 4L works like a charm. It is not the 3 pronged actuator because I checked it, and its working.

Any ideas?

Kaznlilgreenmen · 03-20-2009, 09:46 AM

Quote: Originally Posted by osheimer55

Ok, im going to ressurect this post, because im having the same problem. Only my truck is a 91 S-10. When I put it in 4H it doesnt work, but 4L works like a charm. It is not the 3 pronged actuator because I checked it, and its working.

Any ideas?

Check the vacuum? (sp? its early)

osheimer55 · 03-25-2009, 09:15 PM

good vaccum

chevyrz28 · 03-26-2009, 03:55 PM

Mine did the same thing. I unhooked the battery for a while which resets it and changed the fluid in the transfer case and its been working ever since

raven2510 · 04-02-2009, 12:39 PM

bad encoder motor. change the motor.

the other might be bad 4x4 switch...unlikely.
or a bad TCM(4x4 computer).....unlikely also.

11-22-2005, 11:20 PM	#1
200k1993Blazer Registered User Age: 29 Join Date: Nov 2005 Posts: 5 Location: User is: OffLine	4x4 works in Low, but no High 1996 Jimmy,4x4, the 4x4 will work in Low but if I try to put it in High, the light flashes for a few seconds and then nothing. Any ideas..?
	[Reply w/Quote]

11-22-2005, 11:23 PM	#2
Upsetta666 Registered User Age: 32 Join Date: Aug 2005 Posts: 181 Location: Vero Beach, Fl. User is: OffLine	Re: 4x4 works in Low, but no High Either the encoder motor is bad or there is a 3 port vacuum switch on the transfer case that goes bad. I would try the vacuum switch first, since it's the cheaper of the two.
	[Reply w/Quote]

11-22-2005, 11:27 PM	#3
elburrito Limey Dimer Age: 29 Join Date: Dec 2004 Posts: 193 Location: Klamath falls, Oregon User is: OffLine	Re: 4x4 works in Low, but no High Quote: Originally Posted by 200k1993Blazer 1996 Jimmy,4x4, the 4x4 will work in Low but if I try to put it in High, the light flashes for a few seconds and then nothing. Any ideas..? I got mine stuck in low once, not sure if you have the same shift motor as me, but I just took the plastic housing off to have a look, couldn't do anything with it, put the cover back on and it worked ever since, guess it got stuck.
	[Reply w/Quote]

03-18-2009, 10:52 PM	#4
osheimer55 Registered User Age: 19 Join Date: Oct 2008 Posts: 96 Location: User is: OffLine	Re: 4x4 works in Low, but no High Ok, im going to ressurect this post, because im having the same problem. Only my truck is a 91 S-10. When I put it in 4H it doesnt work, but 4L works like a charm. It is not the 3 pronged actuator because I checked it, and its working. Any ideas?
	[Reply w/Quote]

03-20-2009, 09:46 AM	#5
Kaznlilgreenmen I piss excellence Age: 25 Join Date: Oct 2004 Posts: 850 Location: Springville Ny User is: OffLine	Re: 4x4 works in Low, but no High Quote: Originally Posted by osheimer55 Ok, im going to ressurect this post, because im having the same problem. Only my truck is a 91 S-10. When I put it in 4H it doesnt work, but 4L works like a charm. It is not the 3 pronged actuator because I checked it, and its working. Any ideas? Check the vacuum? (sp? its early)
	[Reply w/Quote]

03-25-2009, 09:15 PM	#6
osheimer55 Registered User Age: 19 Join Date: Oct 2008 Posts: 96 Location: User is: OffLine	Re: 4x4 works in Low, but no High good vaccum
	[Reply w/Quote]

03-26-2009, 03:55 PM	#7
chevyrz28 Registered User Age: 21 Join Date: Nov 2008 Posts: 235 Location: Mercer PA User is: OffLine	Re: 4x4 works in Low, but no High Mine did the same thing. I unhooked the battery for a while which resets it and changed the fluid in the transfer case and its been working ever since
	[Reply w/Quote]

04-02-2009, 12:39 PM	#8
raven2510 Overhead Console Expert Age: 22 Join Date: Jan 2008 Posts: 1,628 Location: Omaha, Nebraska User is: OffLine	Re: 4x4 works in Low, but no High bad encoder motor. change the motor. the other might be bad 4x4 switch...unlikely. or a bad TCM(4x4 computer).....unlikely also.
	[Reply w/Quote]