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Trans shifts hard going up in gear but not when going down

Tiny
OLEWEST98
  • MEMBER
  • BUICK CENTURY
2000 buick century 3.8 ltr. 60,000 mi. The automatic trans. Shifts hard when shifting up but not when shifting down. Also I get a high pitched whine when this occure. It seems to do this more frequently when temps. Are high outside. I changed trans. Fluid and filter. There was nothing in base pan fluid was not burnt. :D
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Friday, August 17th, 2007 AT 3:09 PM

5 Replies

Tiny
CLY
  • MECHANIC
  • 308 POSTS
I woud suspect that the transmission pressure control solenoid is your problem. When it does this can you shut the car off and then restart it and it will be ok for awhile? If you go to a parts store and have them scan the car for codes you will probably find that is has a p1811 for a max adapt long shift. This code will not turn on the light but when it sets it will comand the transmission to full line pressure and that is why it shifts hard.

Cly
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Friday, August 17th, 2007 AT 7:02 PM
Tiny
OLEWEST98
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  • 3 POSTS
Hi Cly thank you for your speedy answer. Yes when I shut the engine off it does reset and will run fine for a while. Do you have to tear the trans apart to replace this part? :D
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Sunday, August 19th, 2007 AT 6:15 PM
Tiny
CLY
  • MECHANIC
  • 308 POSTS
The sidecover has to be removed in-order to replace the solenoid.

Cly
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Sunday, August 19th, 2007 AT 8:20 PM
Tiny
OLEWEST98
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  • 3 POSTS
Cly Thanks again for your help. With out it I would have been in a real mess, also for a speedy answer. :D
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Monday, August 20th, 2007 AT 9:16 AM
Tiny
CLY
  • MECHANIC
  • 308 POSTS
You are welcome and I am Glad I could help.

Cly
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Monday, August 20th, 2007 AT 4:15 PM

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