2005 Kia Sedona 2.9 CRDi Auto won't change up or down gears. What's the cause and solution?

Question edited for clarity.
Question moved to sub category.

P0304 is only a misfire error to cylinder 4.

https://www.700r4transmissionhq.com/p0304-kia-sedona/

There isn't a 'fuel control module'.

https://www.google.com/search?q=2005+Kia+Sedona+2EX+3.5+Fuel+control+module

But there is a fuel pressure regulator

https://www.google.com/search?q=2005+kia+sedona+fuel+pressure+regulator+location

When you look up fuel 'module', you come back to the fuel pump.

https://www.google.com/search?q=2005+kia+sedona+fuel+module+location

One thing you might try is moving coil pack 4 to another cylinder and see if the code moves. After that do a plug swap and see if it moves. Do them separately not coil and plug together..
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Sounds like a shift solenoid sticking.

Go to "ask.com"

Hi. Thanks for your question. Transmission issues can sometimes cost you more money so i would recommend you to troubleshot yourself first. You can visit https://www.reliable-store.com and download the entire workshop manual. It has all the information along with the diagrams for better understanding. Good day!

SOUNDS LIKE A CATALYTIC CONVERTER.... BUT GO TO YOUR LOCAL AUTO ZONE OR YOUR PERSONAL MECHANIC AND HAVE HIM DO A OBD SCAN IT WOULD TELL YOU ALL THE DEALER FAULT CODES.... AUTO ZONE IS FREE LOCAL MECHANIC AT LEAST $250 FOR A 10 MINUTE PROCESS

The engine belt routing. See pictures below:
1. For Kia Sedona 2.5 V6 engine (engine code GV6):



2. For Kia Sedona 2.9D CRDi engine (engine code: KJ):

on transmission has 2 wires at right side of trans .by axel

The remote linkage between the gearstick and gearbox on my 2001 Kia Carnival 2.9 Tdi has parted can anyone assist me as to how to repair it ?

If it's only grinding in one gear, that tells me it's not a clutch issue. However, grinding in any gear is caused by a worn synchro inside the unit. changing the gear lube won't fix that. I'd suggest you do not wait on a repair or metal debris from failure will migrate through the lube and will cause problems with the entire unit.
Wish I could give you better news but that's the way it is.
Good luck

how do you top up the gearbox oil on a kia sedona 2.9diesel on a 03 plate and i have friction noises when driving changing gears.