- #11 of 40
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Re: Encoder Motor Problem for 97 GMC Jimmy [schorndog]
by repairdog
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Nov 07, 2006 (2:17 pm)
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Replying to: schorndog (Nov 07, 2006 1:18 pm)
You lost me on that - encoder motor is only for 4Lo so if you got it into 4Lo then the motor worked and the front axle coupler worked so 4Hi should work - remove the battery cable for 30 minutes and see if that reboots the TCCM or control module and try again. Someone is wrong. Also there are sensors on both the front axle and transfer to send status to the TCCM (the ones that look like a round sender unit with an electrical connector on them. Check all vac lines before you go on!
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- #12 of 40
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Re: Encoder Motor Problem for 97 GMC Jimmy [repairdog]
by schorndog
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Nov 08, 2006 (10:47 am)
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Replying to: repairdog (Nov 07, 2006 2:17 pm)
Yes, I had it at the dealership 2 weeks ago and they diagnosised as the encoder motor, I had read your postings at this site and argued that it should not be the encoder , I had 4 wd low but not high, they stood by there diag...I was reluctant and refused the work, I posted my problem and your suggestion worked, I disconnected the battery and it did reboot, thanks for your help and sharing your knowledge
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- #13 of 40
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Re: Encoder Motor Problem for 97 GMC Jimmy [repairdog]
by firedog443
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Nov 29, 2006 (4:22 pm)
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Replying to: repairdog (Nov 07, 2006 2:17 pm)
Hey repairdog I have a 2002 Jimmy with the 4 HI not working. Took it to the dealer and they said it was the Encoder motor, and that it would cost me $1500 for a new one with the install. Tried removing the battery cable for 30 minutes like you posted and it worked. Thank you very much for your knowledge.
PS: You should be called repairgod.
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- #14 of 40
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Re: Encoder Motor Problem for 97 GMC Jimmy [firedog443]
by repairdog
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Nov 30, 2006 (2:44 pm)
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Replying to: firedog443 (Nov 29, 2006 4:22 pm)
Glad to help. I have 4 Blazers so have had alot of the problems and with three 4wd ones - got 2 with AutoTrac or 236 cases and a 98 with InstaTrac 233 case so keep learning new things all the time. Just as a note you can get many parts online at gmpartsdirect and rockauto and that encoder is about $200 and even the TCCM or 4wd computer is under $300.
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- #15 of 40
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Re: Encoder Motor Problem for 97 GMC Jimmy [repairdog]
by christ123
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Nov 30, 2006 (6:59 pm)
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Replying to: repairdog (Nov 30, 2006 2:44 pm)
repairdog, That sounded like a good call on that encoder motor. I have the same problem with my 2002 Blazer and can't wait to try disconnecting the battery to see if it reset itself. On the chance that does not work, how difficult is it to actually change the encoder motor? I have research some Motors Manuals and they don't actually give the details on R+R the encoder motor.
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- #16 of 40
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Re: Encoder Motor Problem for 97 GMC Jimmy [christ123]
by repairdog
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Dec 01, 2006 (10:28 am)
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Replying to: christ123 (Nov 30, 2006 6:59 pm)
Depends on if 3 or 4 button case, 3 button (NP233)has a 3 port vac switch on the transfer that is most commonly bad and is $15 Motormite/Dorman #49315. If 4 button (NP236)I would look at that underhood firewall mounted vac solenoid as suspect also. GM#15165891 for $45 cause if they leak front axle coupler ops is slow and if they fail and pass vac no axle coupler - so bypass that with a simple inline vac connector and see if 4Hi works. Encoder motor bolts on and about $200 if you shop around but I would do that last. The TCCM is usually locked up and in some climates I've read that condensation gets in the connector and they blow it off and all works. There also is a "4WD" fuse in the dash panel by door and another called "ATC" in the underhood panel that should be checked and can be pulled instead of the battery.
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- #17 of 40
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Re: Encoder Motor Problem for 97 GMC Jimmy [repairdog]
by christ123
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Dec 03, 2006 (2:45 pm)
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Replying to: repairdog (Dec 01, 2006 10:28 am)
Kudos to you, and many thanks Repairdog.
Disconnecting the battery and reconnecting cleared whatever error condition existed. The 4WD works now, thanks for the advice.
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- #18 of 40
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2001 4wd issue
by mojo23
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Dec 05, 2006 (4:22 pm)
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well we got out 2001 LT blazer a little over a year ago. I love the truck its awesome, but recently we have had some problems. we were driving up to rockford hours from home, and our transmission made some nasty clunking sounds, and then wouldn't shift into reverse. so we took it to a local dealership, who were very nice and the warranty covered basically rebuilding the transmission,we didn't have the truck for a week. well just the other day before a big, ice/sleet/snow storm for the 1st time since we got it back I hit the auto 4wd button and nothing happened, I also got stuck in the snow. it won't shift into any of the 4wd gears at all, the panel just blinks and it goes back to 2hi. yesterday I took it back to the dealership I bought it from , and an hour later they told me the decoder motor went bad. they would have to order a new one. well we bought an extended warranty and that doesn't even cover it. they are saying $830 to fix it. I won't have it fixed, I can't afford that. I tried the disconnect the battery trick, and it just does the same thing. I still think them doing something with the transmission and this are connected because it worked when I gave it to them. any one have any solutions here ?
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- #19 of 40
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Re: 2001 4wd issue [mojo23]
by repairdog
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Dec 06, 2006 (3:15 pm)
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Replying to: mojo23 (Dec 05, 2006 4:22 pm)
post once
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- #20 of 40
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Stuck in 4 wheel high puzzler
by dougaroo
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Dec 11, 2006 (7:49 pm)
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99 Blazer...stuck in four wheel high. Will not drop out of four wheel until I pull the ATC fuse under the hood. Replaced the ATC control module..cleaned the contacts...still no go.
Replaced the four button dash switch, no change. Still blinks and will not drop into 2 wheel, (nor four low) the auto four does stay steady lit. Vacuum switch on the firewall is good. You can here the encoder motor working when I push the buttons, can't say it's engaging...the puzzler is why does it drop out of four high when I pull the fuse?
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