2004 Buick Lesabre Transmission Shifting Hard

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target1
Posts: 1
Joined: Sun Oct 21, 2012 5:22 pm

2004 Buick Lesabre Transmission Shifting Hard

Unread post by target1 » Sun Oct 21, 2012 5:29 pm

Hi,
We are having problems with our 2004 Buick Lesabre taking a long time to shift. Once it shifts it runs great. You have to rev it at a high rpm, and then back down on it and it will shift. It almost seems like something is not opening up in order to allow it to shift into gear. Does this sound crazy? Someone told us it was possibly a bad modulator or sensor. How much do these cost, is it hard to get at, and could my husband do it himself?

Thanks,
Laurie

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TerryAuto
Posts: 313
Joined: Fri Dec 11, 2009 8:48 pm

Re: 2004 Buick Lesabre Transmission Shifting Hard

Unread post by TerryAuto » Mon Oct 22, 2012 11:11 pm

If your Buick has a vacuum modulator, it is on the drivers side front of the transmission. Open the hood and look down between the radiator and transmission. It would have a vauum line going to it. But i do not think your car has one.

This is old technology that used to cause late shifting on old cars. Todays cars are electronically controlled. You are describing a transmission slip.

You can try to do a fluid and filter change, that may help. But most likley the transmission needs to removed and repaired. Could be a problem in the valve body, or it is just worn out and needs an overhaul.
Be sure to check the Similar Topics down this page for more help.

lee
Posts: 3
Joined: Tue Apr 16, 2013 2:34 pm

transmission makes Buick stall when slowing down

Unread post by lee » Sun May 05, 2013 12:32 pm

93 buick century 3300 engine stalls at traffic light. like a stick shift when clutch is not pushed in. dtc code-39 torque converter clutch err, quad driver module at fault.

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ProTech
Posts: 651
Joined: Wed Oct 17, 2012 10:08 am

Re: transmission makes Buick stall when slowing down

Unread post by ProTech » Sun May 05, 2013 3:01 pm

When you have a quad driver code, that usually means you need to replace the computer. The torque converter clutch (TCC) sticking on will cause the car to die out as you come to a stop, especially if it has been driven at higher speeds. Normally that requires replacement of the TCC solenoid, and/or the wiring harness inside the transmission.
GM Dealer Technician For 18+ Years
In the automotive industry for 20+

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