2000 Hyundai Sonata transmision downshifting

2000 HYUNDAI SONATA

ZSAY

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Transmission problem
2000 Hyundai Sonata 6 cyl Automatic 120000 miles
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transmission thumps when i'm slowing down or breakiing just before I stop.

Jun 24, 2008 at 12:02 AM

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KHLOW2008

CAR REPAIR CONTRIBUTOR
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.

Jun 25, 2008 at 10:43 AM

ZSAY

MEMBER
3 POSTS

[quote:cf6b246dd3="KHLow2008"]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.[/quote:cf6b246dd3]

Thanks. I was wondering if the input speed sensor has anything to do with it ?

Jun 25, 2008 at 7:19 PM

KHLOW2008

CAR REPAIR CONTRIBUTOR
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.

Jun 26, 2008 at 9:55 AM

ZSAY

MEMBER
3 POSTS

thanks again. I'll have it checked out.

Jun 27, 2008 at 8:28 AM