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Hard jerking during deceleration

Tiny
LILBAKER27
  • MEMBER
  • 2009 KIA OPTIMA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 22,000 MILES
Hi my name is Zac. Thank you for helping me today. When I'm coming to a stop and my car hits 20 mph, it jerks one time hard. It's every time I decelerate at 20 mph. If I put the car in neutral when I am slowing down it doesn't do it. But if the car is in drive, and as soon as it hits 20 mph when I slow down, it has a single violent jerk. Please help I don't know what to do. Thank you
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Friday, February 20th, 2015 AT 10:15 AM

2 Replies

Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Check the motor mounts and the transmission mounts. They may be broken or are weak.
Also take to a few transmission shops and have them test drive it.
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Friday, February 20th, 2015 AT 10:49 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

This sounds like the transmission is downshifting very hard. After the 1 jerk, does it do it again?

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

Are there any codes set?

This could also be a motor mount. They need to be inspected and checked for play. Any shop can do this.

https://www.2carpros.com/articles/replace-motor-mounts

Roy

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Monday, March 30th, 2020 AT 2:31 PM

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