Transmission and Engine issues - Kia Cadenza Forum
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post #1 of 22 (permalink) Old 02-21-2018, 02:11 PM Thread Starter
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Transmission and Engine issues

Hello Fellow Cadenza owners, I am new to the forum..I would appreciate it very much if any of you can suggest a solution to my issues listed below.
I own a 2014 Cadenza Limited , and have a few issues which my dealer so far cannot fix.
When decelerating from about 20 to 30 mph, the tranny suddenly drops into a low gear , at that point the car starts slowing down and engine rpms go up. Then as the car is slowing down it suddenly upshifts and the car jerks forward.
Problem #2 the engine doesn't throttle down to idle when again decelerating . While the tranny is downshifting on its own , if I take my foot off the the brake pedal the car keeps going on its own, engine is going at 1200 RPM, car will keep going until I force it to stop by pressing harder on the brake pedal..allthis happens either at the same time or one at a time.After my tech adviser road tested the car is a busy section of brokklyn,NY full of traffic, he said he didn't see any problem, after pleading with him that maybe the contoller software needed to be upgraded, his mechanic took out an IPAD and said he was doing the update for everything, it took maybe 10 minutes time in all to complete.. I said thankyou and left the dealership, and of course the issues I mentioned are still there...Of all the cars I've ever owned I've had one that went into manual mode downshifted, nor a electronically sticking gas pedal... If anyone has any suggestions,kindly let me know before I go back to my Kia dealer. The dealer I purchased the car from closed down soon after I bought the cadenza, as he was shut down by KIA for too many sales shananigans.

Thanks to all

CP Brooklyn,NY
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post #2 of 22 (permalink) Old 02-22-2018, 11:59 AM
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Find a different KIA dealership. look for one ( on KIA web site)that is
certified to work on the K900, Or call the KIA hotline to ask for one.
Get car reset to factory specs. Takes special equipment to work on K900,
and cadenza

Last edited by gene; 02-22-2018 at 06:06 PM.
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post #3 of 22 (permalink) Old 02-22-2018, 02:11 PM
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That's strange, yeah you could always try a different Kia dealership. When the car downshifts do you think its at the wrong time? Like the RPMS jump during the downshift? I know my Santa Fe Sport has a downshift braking function from 3rd to 2nd to help when braking but this occurs when you would expect a downshift to be made.

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Find a different KIA dealership. look for one ( on KIA web site)that is
certified to work on the K900, Or call the KIA hotline to ask for one.
Get car reset to factory specs. Takes special equipment to work on K900.
The OP doesnt have a K900?
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post #4 of 22 (permalink) Old 02-22-2018, 02:52 PM
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Without knowing anything about the software side of it, it just sounds like you're running too rich, or to high of an idle. That 1200 RPM is about what the startup RPM is until the car is warm. Normally too once you put it into gear before warm, it does drop a little, maybe to 1000rpm, but still feels more tension on the brake is needed to keep it from going forward to hard. But again, once warm the car is going to idle around 700 RMP all day, in or out of gear.


Not really any solution, just sharing how my 2014 seems to run, and what I perceive as normal behavior vs what yours seems to be doing.
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post #5 of 22 (permalink) Old 02-22-2018, 06:05 PM
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I think my Cadenza had to be reset to factory specs for the transmission shifting problem,
But didn't have the idle problem
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post #6 of 22 (permalink) Old 02-26-2018, 08:06 AM
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I would definitely call the Preferred hotline and log an issue with them. They will get on the dealer to look at it more seriously. While my car will downshift while slowing down and it does feel like there is some breaking going on (fuel pump sending less gas in?) it's nothing dramatic and feels like normal to me, nothing jerky.

2014 Kia Cadenza, Metallic Bronze and Beige, Lux Package

Leased 3/1/14
Purchased 1/28/17

Additions:
-Full Korean K re-badge
-Ultra Racing Performance front strut tower bar
-Racing sport pedals

Cadenza products available at: https://www.k5optimastore.com/collec...denza-products
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post #7 of 22 (permalink) Old 02-26-2018, 07:57 PM Thread Starter
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Thanks for your reply, i will definitely call the hot line again...like I stated previously they said they upgraded the software, from an Ipad plugged into the data port under the dash drivers side. I asked if this was for the tranny and the mechanic who was helpful said it was for everything...This only took about 10 minutes, is that possible..Then my service advisor said I was done, didnt write up the service visit and said I'm not charging you... I reminded him that the car was still under warranty till december.
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post #8 of 22 (permalink) Old 02-26-2018, 11:27 PM
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Make sure you tell them just what you are saying here, when you call the hot line


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Thanks for your reply, i will definitely call the hot line again...like I stated previously they said they upgraded the software, from an Ipad plugged into the data port under the dash drivers side. I asked if this was for the tranny and the mechanic who was helpful said it was for everything...This only took about 10 minutes, is that possible..Then my service advisor said I was done, didnt write up the service visit and said I'm not charging you... I reminded him that the car was still under warranty till december.
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post #9 of 22 (permalink) Old 03-01-2018, 06:16 PM Thread Starter
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Thanks Gene I will
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post #10 of 22 (permalink) Old 10-12-2018, 08:38 PM
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Quote:
Originally Posted by BrooklynCKIA View Post
Hello Fellow Cadenza owners, I am new to the forum..I would appreciate it very much if any of you can suggest a solution to my issues listed below.
I own a 2014 Cadenza Limited , and have a few issues which my dealer so far cannot fix.
When decelerating from about 20 to 30 mph, the tranny suddenly drops into a low gear , at that point the car starts slowing down and engine rpms go up. Then as the car is slowing down it suddenly upshifts and the car jerks forward.
Problem #2 the engine doesn't throttle down to idle when again decelerating . While the tranny is downshifting on its own , if I take my foot off the the brake pedal the car keeps going on its own, engine is going at 1200 RPM, car will keep going until I force it to stop by pressing harder on the brake pedal..allthis happens either at the same time or one at a time.After my tech adviser road tested the car is a busy section of brokklyn,NY full of traffic, he said he didn't see any problem, after pleading with him that maybe the contoller software needed to be upgraded, his mechanic took out an IPAD and said he was doing the update for everything, it took maybe 10 minutes time in all to complete.. I said thankyou and left the dealership, and of course the issues I mentioned are still there...Of all the cars I've ever owned I've had one that went into manual mode downshifted, nor a electronically sticking gas pedal... If anyone has any suggestions,kindly let me know before I go back to my Kia dealer. The dealer I purchased the car from closed down soon after I bought the cadenza, as he was shut down by KIA for too many sales shananigans.

Thanks to all

CP Brooklyn,NY
My car has the exact same problem! Have you found the cause/sollution?
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