Transmission issue, code P0734

NEIL R HEIM

MEMBER
2003 KIA SPECTRA
1.8L
4 CYL
2WD
AUTOMATIC
65,000 MILES

I get the code, P0734 gear 4 incorrect gear ratio.

Friday, June 5th, 2020 AT 9:38 AM

3 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I'm Danny.

I've attached diagnostic flow chart below for that particular transmission code for your car. I've cut it into a few pieces so you can view larger. Hope this helps and thanks for using 2CarPros.

Images (Click to make bigger)

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Friday, June 5th, 2020 AT 11:12 AM

NEIL R HEIM

MEMBER
2 POSTS
2003 KIA SPECTRA
1.8L
4 CYL
2WD
AUTOMATIC
65,000 MILES

My aforementioned question about code P0734. What can I do, to correct, fix, repair, or replace what component? Or do I need to replace or repair the transmission? I thank you In advance, for all your doing to help me to correct my issue with my vehicle listed above. God bless you, have a great day.

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Friday, June 5th, 2020 AT 12:13 PM (Merged)

ASEMASTER6371

MECHANIC
52,797 POSTS

Good morning,

This code is for low line pressure for the transmission. It could be from the front pump not working or worn out or it could be from a leak internally bleeding off the pressure.

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

I attached a diagram for you to view. It does indicate that the transmission will need to be either rebuilt or replaced if the pressure is low.

You could try changing the fluid and filter. I doubt it will change anything but it would be worth a try.

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Roy

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Friday, June 5th, 2020 AT 12:13 PM (Merged)