Transmission hard shifts when warm

2003 BUICK LESABRE
58,000 MILES • 3.8L • V6 • 2WD • AUTOMATIC
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2003BUICKLASABREI
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  • 4 POSTS
When warm hard shifting majority of time. When cold in beginning is okay.
Jan 19, 2020 at 9:15 AM
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ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
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Good afternoon,

This sounds like an issue with the valve body. There may be a weak or broken spring in the valve body.

https://www.2carpros.com/articles/automatic-transmission-problems

Are there any codes in the system?

How long since you changed the filter and fluid?

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Roy
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Jan 19, 2020 at 1:30 PM
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2003BUICKLASABREI
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Okay, thank you. I will read trouble codes. What is a good trouble code reader scanner to buy to have in the tool box?
Jan 19, 2020 at 4:33 PM
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ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
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You can get a cheap one at a parts store for under $50.00 or you can have them read it for you for free.

Roy
Jan 19, 2020 at 4:40 PM
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2003BUICKLASABREI
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Okay, thanks. like to have a good one in the tool box. Any recommendations?
Jan 19, 2020 at 5:10 PM
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ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
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Okay, I attached 4 of them for you. They run from cheap to one that does live data including ABS. I like that one but a little price. I do not know your budget but look them over.

My favorite tool store has them in stock. Harbor Freight.

Roy
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Jan 19, 2020 at 5:27 PM
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2003BUICKLASABREI
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Okay, thanks. Great advice.
Jan 19, 2020 at 8:20 PM
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ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
Jan 20, 2020 at 3:30 AM