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Won't go into 4WD

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Old 02-16-2007, 10:27 AM   #1
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Won't go into 4WD

1997 Jimmy, V6, AT. 100K miles.

Attempted to put into 4WD the other day on my way to work but nothing happened. I pushed the dash switch repeatedly and it finally went into 4WD High. All was well until I tried to get it out of 4WD and back into 2WD. No luck. Brought it to a garage and the mechanic somehow got it back into 2WD but he told me that the dash switch needed to be replaced, which I did. The 4 WD still did not work properly. It would go in and out of 4WD Low just fine but when I pushed the switch for 4WD High the lights on the dash switch would blink alternately between high and low for a half dozen times and then revert back to 2WD. The mechanic told me that he thought it was the actuator switch on the transfer case so I had him replace that. He told me after replacing the actuator switch that it still would not go into 4WD so he put the original actuator switch back and told me to bring it to a transmission specialist. He said that he cheched the vacuum lines and they were OK. Now when I press the 4WD buttons nothing happens at all, Neither 4WD High or 4WD Low work.

Other than this problem the car runs great and has never given me any problems in the past. The 4WD has always worked and there are no strange or unusual noises. Any help would be greatly appreciated.

Thanx
Old 02-16-2007, 07:18 PM   #2
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Re: Won't go into 4WD

Try The Transfercase Encoder Motor. These Are Known To Go Bad.
Old 02-16-2007, 10:57 PM   #3
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Re: Won't go into 4WD

Quote: Originally Posted by mikey9876543210
Try The Transfercase Encoder Motor. These Are Known To Go Bad.
Tell your so called mechanic to keep on replacing parts...Sooner or later he'll get lucky.

Also tell him to figure out what the TCCM is, where it is, how to pull codes from it, and how to clear those codes. Then look at the encoder motor...That'll cost about 200 clams unless he's crazy enough to get it from the chevy dealer..and about another 200 clams to install it..

.
Old 02-17-2007, 09:35 AM   #4
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Re: Won't go into 4WD

Quote: Originally Posted by cyclone
Tell your so called mechanic to keep on replacing parts...Sooner or later he'll get lucky.

Also tell him to figure out what the TCCM is, where it is, how to pull codes from it, and how to clear those codes. Then look at the encoder motor...That'll cost about 200 clams unless he's crazy enough to get it from the chevy dealer..and about another 200 clams to install it..

.
Thanks for your response. The mechanic that I brought my Jimmy to is very reputable. I have been going to him for years and he has always treated me fair.
When I first brought the vehicle to him I am certain that the dash switch was broken. That was only a $35 fix. However the vehicle still would not go into 4WD high after replacing the switch. When the button on the dash was pushed for 4WD high you could hear the motor attempt to put the Jimmy into 4WD but it just wouldn't go. It would, however, go in and out of 4WD Low without a problem.

The mechanic then told me that he thought that it was the actuator motor But I may have misunderstood him and maybe he meant the TCCM. Anyway, He called the Chevy dealer and got a price of $579 fot the part alone. He than called a 3rd party supplier who gave him a price of $289 for an aftermarket part. He put that part in my car but still no 4WD. He told me that after he replaced the motor, it worked for 2 or 3 times and then stopped working again. He then put my old part back in and told me that I should bring it to the transmission specialist but he thought that there might be "something going on" inside the transfer case. He didn't charge me a cent for his efforts.

I will be the first to admit that I know nothing about 4WD or how it works. I want to get this car fixed but I don't want to "mortgage the farm" in order to do so. I plan on bringing it to a transmission place but don't want to be "taken to for a ride". I am looking to find out ahead of time what the problem might be and how much I can plan on speding to get it fixed.

One last note. The 4WD worked flawlessly when I last used it, but that was last spring and never used 4WD again until 2 weeks before Christmas when I discovered that I had a problem.

Again, I really appreciate your help and truly value your input.

Thanks
Old 02-17-2007, 10:17 AM   #5
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Re: Won't go into 4WD

Quote: Originally Posted by Captain Computer
Thanks for your response. The mechanic that I brought my Jimmy to is very reputable. I have been going to him for years and he has always treated me fair.
When I first brought the vehicle to him I am certain that the dash switch was broken. That was only a $35 fix. However the vehicle still would not go into 4WD high after replacing the switch. When the button on the dash was pushed for 4WD high you could hear the motor attempt to put the Jimmy into 4WD but it just wouldn't go. It would, however, go in and out of 4WD Low without a problem.

The mechanic then told me that he thought that it was the actuator motor But I may have misunderstood him and maybe he meant the TCCM. Anyway, He called the Chevy dealer and got a price of $579 fot the part alone. He than called a 3rd party supplier who gave him a price of $289 for an aftermarket part. He put that part in my car but still no 4WD. He told me that after he replaced the motor, it worked for 2 or 3 times and then stopped working again. He then put my old part back in and told me that I should bring it to the transmission specialist but he thought that there might be "something going on" inside the transfer case. He didn't charge me a cent for his efforts.

I will be the first to admit that I know nothing about 4WD or how it works. I want to get this car fixed but I don't want to "mortgage the farm" in order to do so. I plan on bringing it to a transmission place but don't want to be "taken to for a ride". I am looking to find out ahead of time what the problem might be and how much I can plan on speding to get it fixed.

One last note. The 4WD worked flawlessly when I last used it, but that was last spring and never used 4WD again until 2 weeks before Christmas when I discovered that I had a problem.

Again, I really appreciate your help and truly value your input.

Thanks


Well, If he put in a new encoder motor, he should have cleared the codes from the TCCM.
Look at your fuse panel and see if you have one labeled TCCM...I don't know if this sequence will work for 97's but If you have that fuse I'll let you know how to attempt to clear the codes..
Old 02-18-2007, 02:40 AM   #6
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Re: Won't go into 4WD

IF the 97 is similiar to the 95 there is a vacuum actuator under the battery tray that will seize up and make it difficult to impossible to go from 2-4 and back again. Got a used one and mine was fine after that.
Old 02-18-2007, 01:49 PM   #7
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Re: Won't go into 4WD

Quote: Originally Posted by Jetmeck
IF the 97 is similiar to the 95 there is a vacuum actuator under the battery tray that will seize up and make it difficult to impossible to go from 2-4 and back again. Got a used one and mine was fine after that.

Thanks, I'll check that out.
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