18th Dec 2009, 22:45

Well everyone, I too own a 2000 Buick Century with a 4T65E transmission, and just like everyone, same problem, but heads up to everyone, I paid $650.00 to have the the PCS SENSOR replaced and it didn't help, the issue is less than before, but is there.

I also replaced the PCM in case of a comp glitch, also added extra oil, less oil, and disconnected the battery for a reset on all the electricals, and nothing has worked. So the last resort is to actually have the tranny re-manufactured, by someone that can guarantee for at least a year. Until anyone comes up with a better solution, I'm not going to throw my money away on GM anymore, I'm getting a Infiniti next week because Japan gives you a warranty of 100,000 miles and GM ONLY for 30/60,000... this just shows how much they trust their own vehicles, hope GM does something better than to ignore this comments and ripping people of their money with their commercials about their cars being the best; they aren't.

2nd Jan 2010, 15:40

I think it stinks that they knew and did nothing. Lube Guard in the red bottle also is a short term cure with fluid and filter change. Good luck!

7th Feb 2010, 22:16

This is my second comment, last one was two years ago. The car still runs great & the transmission still whines & slam shifts. Added extra fluid on change & it did nothing to stop the problem.

13th Feb 2010, 21:24

My 2001 Buick Century has many problems, like my transmission went like twice already, and my speedometer is not reading any more. Also, the car loses energy sometimes, and the battery dies, and it is a new battery.

14th Feb 2010, 12:36

"Also, the car loses energy sometimes, and the battery dies, and it is a new battery."

Sounds like a faulty alternator to me.

26th Feb 2010, 20:42

I have a 2000 Buick Regal LS, and have the hard shift problem mentioned in most of the comments in this forum.

My questions," Is there a recall for the hard shift problem in the 4T65E transmissions, and has anyone forced a class action lawsuit on GM because of this problem?

28th Mar 2010, 08:32

Nope, no recall. Mine started at 65,000. They knew it was faulty, too many complaints. But they did nothing. I thought maybe they would build some kind of bypass, something, to help correct the problem. Now the cars are too old to recall. Darn shame, it's a nice riding car too!

4th Apr 2010, 17:07

Took in for a tranny flush and dealer recommended upgrading fluid from type 3 to type 6 I believe. Claimed this fluid would make my tranny last longer. After I left the tranny is experiencing periodic hard shifting. They claim the fluid has nothing to do with this problem...

05 Buick Century.

5th Apr 2010, 00:50

I recently purchased a 2000 Buick Century Custom with 134000 miles. Right away, I experienced the tranny problems; a jerking long shift. I spent 1100.00 dollars to have a tranny with 11000 miles installed. Ran great for 2 days, then started jerking again. So I took it to a tranny shop and was told that if I change the solenoid and add a shift kit, it would solve the problem. The cost for the work is 600.00 dollars. I haven't decided whether to do it or not yet.

15th Apr 2010, 09:48

Looks like a shift kit may be the way to go. My 01 Intrigue with (128k) does it too.

15th Apr 2010, 10:21

01 Intrigue (128K) trans flush at 100K; same trans issue as everyone else. I've studied this thing from all angles trying to figure out when it does it the most, and have narrowed it down to two events:

1) Turning a slow left, why left I don't know

2) Going slow up or down a slight hill (I can make it happen in the parking garage that I park in), will produce the harsh shift for me.

I'm wondering if a shift kit is the answer. Also, what do you think about adding an external trans cooler to these cars?

Does anyone know if it happens for the Grand Am or Alero owners?

15th Apr 2010, 22:41

I wish I had read these comments before I agreed to have my solenoid replaced on my 2002 Buick Century. I had no idea this was such a universal problem. I was not told that my transmission would still be functional if this was not replaced. But I did not do my homework, and tomorrow I will be out $500.00.

20th Apr 2010, 21:02

I have a 2000 Buick Century... and my car keeps shutting off on me... And I dunno what it is... I got the fuel pump changed, fuel filter change, a sensor change, a fuel injector cleaner done, and a new alternator change... I dunno what to do next...

27th Apr 2010, 10:31

I bought my 2000 Century Custom from "older" in town type drivers... Lots of local mileage admitted when I bought, and so I have been diagnosing issues to date appropriately.

Number one is the tranny. They actually had it rebuilt at a local well respected shop for the tune of 2 grand. The original work order complaint notation was :"hard shifting". At 50k!!! I bought car at 80k and am considering fluid flush.

After considerable research, I have discovered that adding a certain friction modifier (Lubegard Platinum), and knowing at previous trans replace Dex 6 was used, the valve bodies function quite a bit more smoothly, especially when trans is warm or engaged in a hotter internal action. No, I usually don't subscribe to "mechanic in a can" theories... however this one is a rare exception. This was done 10k ago and I admittedly am not gentle all the time on the car and freely use the kick down passing shift. Many owners tell of feeling the first signs of trouble in this particular situation. I felt it once when the car was first purchased and since addition of Lubegard, nothing!!! Keeping in mind the trans is used harder than gentle or "easy"... I'll change fluid and filter at 100k and see how it goes and let you all know results and or trouble.

Thanks for all so far with the helpful input and great tact that I have observed so far, it's refreshing and I'll continue to be involved.

26th Jul 2010, 09:19

I have been following this blog for months, and would like to tell you I have tried most of the solutions listed here. I can finally say I solved my issue with hard shifting. I replaced the spark plugs and found the gap on them all was incorrect. I replaced with new plugs and the correct gap, and the problem has not occurred for over 3 months of hot, stop-n-go driving. I hope this helps others, but the new plugs and correct gapping fixed my issue.

26th Aug 2010, 14:47

2000 Buick Century - has 17,000 miles, and when starting from a stop, the car slips and jerks. Eventually it goes away as the car moves forward. Have not tried to repair it yet, but a mechanic is looking into it.

8th Sep 2010, 18:33

I have a 2000 Buick Century.

Like almost everyone else my transmission started banging during up-shifting & it whines. When it first started at 60,000 miles the AAMCO dealer in Fl. told me I would not make it home to Vermont with it.

The good news is that I still have the same problem 110,000 later. It has not gotten a bit worse (or better). When it happens, I pull off to the side of the road, turn off the engine & spend 5 minutes of quality time with the wife. Start it up and no more problem; till I stop quickly or make a sharp turn accelerating again.

Sure is cheaper than fixing it or getting a new car.