2000 Olds shilouette trans hard shift

angus young · #1 03-29-2005, 08:17 PM

Hi , My 2000 olds shilouette developed a problem, sometimes the transmission starts to shift hard and is accompanied by a winding noise. This is an on and off thing. I've been told this may be a problem with a vaccum switch for the transmission? if anyone has any info on this switch and the exact location of it , please help me out. Thanks

diesel1962 · #2 03-30-2005, 04:48 AM

Good Morning!! Vacume modulator would be located on drivers side,front of transmisson.Open hood,Look stright down,And slighty to your right.There will be a vacume hose attached to it.It will look like a small cylidener shaped object,Facing the front of the vehicle.I think one bolt holdes it on the transmisson.Check to see if vacume hose is attached,or cracked.The modulator can be replaced easily.More later(I have to get to work!!). Have a good day!! Diesel1962...

tommy the shrimp · #3 05-11-2005, 01:33 PM

Quote:

Originally Posted by angus young

Hi , My 2000 olds shilouette developed a problem, sometimes the transmission starts to shift hard and is accompanied by a winding noise. This is an on and off thing. I've been told this may be a problem with a vaccum switch for the transmission? if anyone has any info on this switch and the exact location of it , please help me out. Thanks

I have the same problem with my van, Did you solve your problem? I am initerested what the cause of the problem was. I was told i needed a new pressuse control solinoid which is inside the transmission. Thanks in advance

Tom

OSUCowboy27 · #4 06-29-2005, 11:01 AM

Quote:

Originally Posted by diesel1962

Good Morning!! Vacume modulator would be located on drivers side,front of transmisson.Open hood,Look stright down,And slighty to your right.There will be a vacume hose attached to it.It will look like a small cylidener shaped object,Facing the front of the vehicle.I think one bolt holdes it on the transmisson.Check to see if vacume hose is attached,or cracked.The modulator can be replaced easily.More later(I have to get to work!!). Have a good day!! Diesel1962...

There is no vacuum modulator on this trans since it is computer controlled. Also, sell it immediately. The next problem will be the loss of OD. This is a common problem that happens around 115000 miles and is totally unrelated to lack of maintenance.

cdru · #5 06-29-2005, 12:11 PM

Quote:

Originally Posted by OSUCowboy27

There is no vacuum modulator on this trans since it is computer controlled. Also, sell it immediately. The next problem will be the loss of OD. This is a common problem that happens around 115000 miles and is totally unrelated to lack of maintenance.

You might want to inform GM engineering that they were not to have included a vacuum modulator in our vehicles because they did. It's a $20 aftermarket part that is easy to change. I can't comment on your claim that it's "a common problem that happens aroudn 115000 miles" but there isn't exactly a wave of complains about it here. Telling someone to sell a vehicle immediately when a $20 part may or may not fix a vehicle is just silly.

OSUCowboy27 · #6 06-29-2005, 01:24 PM

Quote:

Originally Posted by cdru

You might want to inform GM engineering that they were not to have included a vacuum modulator in our vehicles because they did. It's a $20 aftermarket part that is easy to change. I can't comment on your claim that it's "a common problem that happens aroudn 115000 miles" but there isn't exactly a wave of complains about it here. Telling someone to sell a vehicle immediately when a $20 part may or may not fix a vehicle is just silly.

Yeah, what was i thinking giving "ADVICE" on selling the car. At least i did not "Advise" them to torch it and get the insurance money. When you look up a vacuum modulator on AutoZone's web site it says Not Freakin Required because a 2000 does not have one. You may also call your local dealership and ask them for a $20 vacuum modulator for a 2000 olds and listen closly while they laugh at you. I bet you think it is also carburated!!!! BTW, there are lots of complaints on automotive forums about the 4T65E transmissions 4th clutch hub assembly. Next time i would "Advise" you to make sure you know what you are talking about before making a reply and including my quote.

cdru · #7 06-29-2005, 03:27 PM

I stand partially corrected. At least the 97 and 98 had a modulator, 99 onwards appears didn't. I still stand by what I said about immediately selling a car, especially without knowing for sure what was wrong. If it was a $500 beat-em up car, that is one thing. But if the vehicle has signifianct value and is mechanically sound other then that, a used or rebuilt transmission may make economical sense, especially if the owner is a shade tree mechanic and can do the labor himself.

burdman · #8 09-13-2005, 08:01 PM

I read these posts after I had taken my 2000 Olds Silhouette to the tranmission tested. It had 2 problems -- torque converter valve and maximum line shift (the hard shift problem). The shop told me the only way to truly fix the problem is to replace the transmission. He also said that the Over Drive would eventually go away too. Probably not too late to torch!

Allbert · #9 10-31-2005, 08:59 AM

Given your symptoms and the high incidence of PCS failures in 4T40/45/65E transmissions, I would bet that the problem is a worn pressure control solenoid. Check out Flatrater's post in the Buick Century forum for great pictures of the problem with that part. http://www.automotiveforums.com/vbulletin/t398499.html

angus young · #10 03-24-2006, 09:42 AM

Tommy the shrimp- the RIGHT advice was from Albert (thanks albert) it was the pressure selonoid valve, since replacing it I have had no problems, everything is running smooth, glad I didn't take OSU cowboys advice, (sell it) that would have been dumb since the van is fine in every other aspect , but I did waste my time looking for a vac. modulator that never existed, thanks for that wild goose chase cdru and diesel1962, now I know that there are some people on here who think they're sure they know everything, what else would I expect from a colts fan ?

But once again, thanks Albert, you hit the nail on the head, problem solved , money saved!!

before1999 · #11 10-22-2012, 03:17 PM

I have a 2000 olds shilouette and have lost OD. Anyone tell me problem ?

Tech II · #12 10-23-2012, 06:27 PM

If you lost overdrive(overdrive is fourth gear), it could be something as simple as a solenoid, or it could involve a rebuild......this should have set a tranny code in the PCM.....first place to start....

before1999 · #13 10-24-2012, 02:45 PM

TECH II Thanks for the reply. I had a shop do an "electronic" look see at it the other day and he said no code showed up. Now I told this to another tech and he asked if the "electronic" was on the check engine side or the "transmission side" ????
I didn't know that there was a difference

LMP · #14 10-27-2012, 10:36 AM

Quote:

Originally Posted by before1999

I have a 2000 olds shilouette and have lost OD. Anyone tell me problem ?

Failed Throttle Position Sensor will inhibit 4th gear...as well as TCC and cruise control. A common failure. AN easy fix.
ALso...a high transmision temp reading (either true or false) would also inhibit 4th gear.

before1999 · #15 10-29-2012, 09:46 AM

Quote:

Originally Posted by LMP

Failed Throttle Position Sensor will inhibit 4th gear...as well as TCC and cruise control. A common failure. AN easy fix.
ALso...a high transmision temp reading (either true or false) would also inhibit 4th gear.

LMP
Thank you very much for your help. I am bringing it to another transmission place that was recommended so we will see if he comes up with that fix. If not then I will ask him to check this out for me. How can you tell a "high transmission temp reading" ?

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