Last post on Sep 15, 2013 at 6:23 AM
You are in the Buick LeSabre
What is this discussion about?
Buick LeSabre, Transmission, Sedan
#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?
#80 of 101 Re: No codes showing,check engine light remains on [ibdaman]
Oct 18, 2010 (11:14 am)
No idea for sure. But, I follow the Bonneville discussions and several have found problems with CPUs on 94 and 95s. They often have multiple codes however...
The odd thing is no codes but the CEL is on...
Spark plugs and wires in good shape?
Either should be giving codes for misfire based on the description you're giving. No codes, thought.
Do you know anyone with the same car that you can switch computers with?
#81 of 101 Re: 2001 LeSabre tranmission problems [aj0220]
Jan 18, 2011 (5:58 pm)
Im having the exact same problems with my buick lesabre. Were you able to solve your problem? If yes, what steps or repairs did you have to make to have the car fixed?
#82 of 101 Re: 2001 LeSabre tranmission problems [dj1027]
Jan 19, 2011 (7:35 am)
How many miles?
How many times have the fluid and filter been changed in those miles?
If you are getting a sensation of excess movement in the trans and engine unit, you may have a motor/transmission mount that has gone bad.
You also might have a problem with a pressure control unit inside.
It needs to be driven by experts that you trust not to rip you off or sell you extra stuff trying to "guess" at the solution.
A parts store desk clerk using an electronic reader won't know--theirs don't read transmission codes, if any, in most cases. The one I had on loan from a box store didn't.
#83 of 101 Buick lesabre 1991 transmission (?)
Mar 06, 2011 (7:13 pm)
When stopped at light or any other stop, car goes into neutral at times. If you put it in neutral and then back to drive, it will move forward normally. Sometimes it does this 4 or 5 times during a short trip and then acts normal. Once recently, on a hill I stopped and when pushing the gas, the car started to roll backwards and would not go forward but eventually, it moved forward.
Recently had the system "pressure" removal of all old trans fluid which mechanic said was very dirty. (car has 96,000 and original fluid at that time). Mechanic did not drop pan and replace filter. Need some advice please.