Last post on Sep 15, 2013 at 6:23 AM
You are in the Buick LeSabre
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Buick LeSabre, Transmission, Sedan
#70 of 101 Re: Buick Lesabre transmission will not engage [locksmitty]
Mar 29, 2010 (6:41 am)
I had that happen in my 2003. I thought it was from a cold start and I didn't wait for all of the lights to go out on the dash. You know, that computer stuff, still checking itself out.
Another time it was after a long drive and we arrived at the motel and putting in reverse the tranny wasn't engaged and revving the engine up revealed a clunk and then the tranny engaged.
This was after a fluid change. Vehicle has 83K. It happens sporadically. I guess it's hinting of something coming for the future. This line of Buick seems prone to transmission failure.
Before the fluid change the tranny would shift, sometimes, rough 1st to 2nd. Since the fluid change nice shifting all the time now. Good firm shift.
#71 of 101 Re: Buick Lesabre transmission will not engage [niceride3]
Mar 29, 2010 (7:46 am)
How many miles did the transmission have on it before the first fluid change you mentioned? I suspect something in the way of sediment or sludging may be affecting a part of the control valves. Someone familiar with the transmission could probably tell you exactly which part based on your symptoms. I can't.
What fluid did you use for the change? The new Dexron VI is a synthetic or synthetic blend that can be used for the newer transmissions. You might have another fluid change done and see if additional new cleaners in the fluid help cleanup what I suspect may be something restricting a valve from moving. Realize I may be wrong.
The rough 1-2 shift may be a pressure control module. Some of those seem to not work properly in the 4T65E's lately. Turning the car off and restarting usually changes whatever didn't work right and the shifts are smoother.
>This line of Buick seems prone to transmission failure.
The 4-speed transmissions in Buicks have been considered very reliable. I have to disagree with your statement. IF you think they're not, I recommend buying a Honda (they have a history of trans problems, with extended warranties, replacements that fail, etc. See an odyssey transmission discussion for examples of their current problem area).
Edit. I just realized I didn't ask a relevant question. Did you have the fluid drained and the filter replaced? OR did you have a flush performed where they just connect hoses and pump fluid with a strong cleaner in it through the transmission?
#72 of 101 Re: Buick Lesabre transmission will not engage [imidazol97]
Mar 29, 2010 (7:58 am)
Well I bought this car with 125,000 miles on it and had it changed then by a mechanic.
This last time I did it myself, fluid and filter. I forget what fluid I used.
I thought it was just cuz it was cold out thats why it was acting up.
I changed it to be sure and the fluid looked nice not burned or terribly discolored.
#73 of 101 Re: 2000 Buick Le Sabre transmission slips [imidazol97]
Apr 01, 2010 (1:31 pm)
Yeah, I didn't know that the ABS, brake, and service engine light wasn't on all the time until Mom told me that they weren't staying on all the time until the mechanic at the transmission shop she took it to rebuilt the transmission for $1700.00. Do I need to take it to the Buick dealer or just find a good mechanic? which is hard to find. The gas needle doesn't work either. it says it's full then when it's almost out of gas it will go from full to empty and the low fuel light comes on. I don't know if the people that worked on the transmission messed that up too. Thanks for advice.
#74 of 101 2001 LeSabre tranmission problems
Apr 18, 2010 (6:32 pm)
I own a 2001 Buick LeSabre with 43,000 miles. I first noticed the transmission would sometimes jump a bit when switching gears at around 25-30 mph. This was a few months ago and it was not an every day problem. A dash light appeared about a month ago after a rain. I took the car to parts store and the employee attached a computer which indicated a Torque Circuit Converter or TCC switch as being a possible problem. I read on another website that the dash light would sometimes go off after drying out from the rain, and it did. Now the car in Drive will run up to about 25 or 30 mph or maybe about 3000 rpms and then the gears will disengage. When a certain speed is reached, the car will stop moving forward as if the car is in neutral, and the tachometer will advance rapidly until I stop depressing the accelerator. The gears will only re-engage when I coast down to about 5 mph or restart from a complete stop. I checked the transmission fluid according to the owner's manual. The fluid level is okay, and the fluid looks light pink on a white paper towel. Could the transmission still be under warranty? The car is in very good condition otherwise. I cringe at the thought of spending $2000 on this. Is there a government website where I can register my problem and see how many others have had similar problems?
#75 of 101 Re: Hesitation or "Bucking"- Trans or Engine? 
Apr 28, 2010 (2:40 pm)
sounds like torque converter lock up - tcc . have you local tech. check to see if you are having a tcc soleniod failure - that would cause the jerk at that speed. hope that helps
#76 of 101 1989 Buick Lesabre Transmission Problem
Aug 03, 2010 (12:26 pm)
May be two separate problems? or related?
(1) when coming to a stop, hear a "clunk" sound, like a downshift;
(2) just before automatic shift to 1st, feels like a vacuum "whoosh".
Will changing transmission fluid help? Is transmission getting ready to have to be replaced? Thanks for any help.
#77 of 101 Re: 1989 Buick Lesabre Transmission Problem [abbyjohn]
Aug 03, 2010 (1:19 pm)
Hard to talk about sounds from a distance. Does it sound like the case of the transmission with the motor attached hitting on metal? Motor mount? Transmission mount?
Does it sound like it's internal to the transmission--then you need to ask an expert.
Don't understand what you mean "automatic shift to 1st"? Do you mean starting from a dead stop and the transmission is going to shift from 1st to 2nd?
#78 of 101 Re: 1989 Buick Lesabre Transmission Problem [imidazol97]
Aug 03, 2010 (2:21 pm)
I meant like after a red light, and starting to drive again, and about after 10 to 15 mph when car is ready to shift into next gear, so I guess I meant shifting to 2nd.
The "whoosh" sound doesn't sound like hitting on metal, more like a vacuum line sound.
#79 of 101 No codes showing,check engine light remains on
Oct 18, 2010 (9:30 am)
(94-Buick Le Sabre)Three times on the scanner 75 a pop..have replaced all the required code parts..no codes show and CK engine light is still on..also rough driving /sputtering at 40 mph..What is the problem?