# 2006 Buick Rendezvous - Shifts hard

**URL:** <https://community.cartalk.com/t/2006-buick-rendezvous-shifts-hard/178484>\
**Category:** Maintenance/Repairs\
**Tags:** transmissions\
**Created:** [August 4, 2021, 7:57am UTC](https://community.cartalk.com/t/2006-buick-rendezvous-shifts-hard/178484 "2021-08-04T07:57:38Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![LeeJones37](https://avatars.discourse-cdn.com/v4/letter/l/90ced4/32.png) [@LeeJones37](https://community.cartalk.com/u/LeeJones37)\
**Post date:** [August 4, 2021, 7:57am UTC](https://community.cartalk.com/t/2006-buick-rendezvous-shifts-hard/178484/1 "2021-08-04T07:57:38Z")

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Transmission does fine until about 1hour of driving then it shifts really hard.

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**Author:** ![weekend-warrior](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/weekend-warrior/32/26122_2.png) [@weekend-warrior](https://community.cartalk.com/u/weekend-warrior)\
**Post date:** [August 4, 2021, 5:33pm UTC](https://community.cartalk.com/t/2006-buick-rendezvous-shifts-hard/178484/2 "2021-08-04T17:33:34Z")

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Only drive it for 59 minutes. lol sorry I had too.  
check tranny fluid level. if full bring it to a tranny shop.

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**Author:** ![Renegade](https://avatars.discourse-cdn.com/v4/letter/r/b4bc9f/32.png) [@Renegade](https://community.cartalk.com/u/Renegade)\
**Post date:** [August 4, 2021, 6:13pm UTC](https://community.cartalk.com/t/2006-buick-rendezvous-shifts-hard/178484/3 "2021-08-04T18:13:00Z")

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> [@weekend-warrior](#):
>
> Only drive it for 59 minutes. lol sorry I had too.

Feeling hump day are you. 😆

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**Author:** ![Scrapyard-John](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@Scrapyard-John](https://community.cartalk.com/u/Scrapyard-John)\
**Post date:** [August 5, 2021, 3:19am UTC](https://community.cartalk.com/t/2006-buick-rendezvous-shifts-hard/178484/4 "2021-08-05T03:19:39Z")

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The trans in my lesabre does similar. I believe the hard shifting is caused by the computer, which commands a higher line pressure during shifts after it detects some slippage between shifts. Long story, but in my case, the computer is trying to keep the trans from slipping by commanding a harder, firmer shift. Pretty common issue with the 4T65E trans. Generally, they’ll still last a pretty long time after the hard shifting starts. If the trans isn’t worn (mine probably is, being a 2005 with 180k miles), you might have a problem with the pressure control solenoid. It’s not easy to get to on my car (basically the trans has to almost come out) so I haven’t tried to replace the solenoid. A good trans shop should be able to diagnose it. Do not let anyone talk you into a rebuild because of the hard shifting, though. Mine started hard shifting from time to time around 80k miles ago.