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2000 Hyundai Sonata transmision downshifting

Tiny
ZSAY
  • MEMBER
  • 2000 HYUNDAI SONATA
Transmission problem
2000 Hyundai Sonata 6 cyl Automatic 120000 miles

transmission thumps when i'm slowing down or breakiing just before I stop.
Tuesday, June 24th, 2008 AT 12:02 AM

4 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi zsay,

You need to have the trans checked. Most probably the trans valve body and solenoids are not working well. The symptoms points to line pressure instability.
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Wednesday, June 25th, 2008 AT 10:43 AM
Tiny
ZSAY
  • MEMBER
  • 3 POSTS
Thanks. I was wondering if the input speed sensor has anything to do with it?
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Wednesday, June 25th, 2008 AT 7:19 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi zsay,

If the speed sensor is faulty, the speedometer won't work and it will cause erractic gear shifting.

The TCM operates with signal from the speed sensor to provide correct time for gear changes so if it is malfunctioning, get it replaced first.
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Thursday, June 26th, 2008 AT 9:55 AM
Tiny
ZSAY
  • MEMBER
  • 3 POSTS
Thanks again. I'll have it checked out.
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Friday, June 27th, 2008 AT 8:28 AM

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