Hard jerking during deceleration

2009 KIA OPTIMA
22,000 MILES • 4 CYL • FWD • AUTOMATIC
Avatar
LILBAKER27
  • MEMBER
  • 1 POST
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
Feb 20, 2015 at 10:15 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
CADIEMAN
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 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.
Feb 20, 2015 at 10:49 AM
Advertisement
Avatar
ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 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

Images (Click to enlarge)
Attached Media
Attached Media
Mar 30, 2020 at 2:31 PM