2012 Sorento Jerks intermittently - Kia Forum

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post #1 of 17 (permalink) Old 07-06-2019, 09:52 AM Thread Starter
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2012 Sorento Jerks intermittently

I have been experiencing an intermittent "jerking/hesitation" problem with my 2012 Kia Sorento LX. Yesterday was the worse of it, the car felt like it wanted to break down in the middle of the road while I was trying to accelerate from low gears or make a stop. I just know that it doesn't run smoothly and makes me frustrated because whenever I bring it to be serviced, the mechanics would say that my car runs "okay" and they don't experience the symptom upon test driving, neither they see error codes when hooked into the computer.

It makes me wonder if this is related to the ECU software recall update that they did in Feb 2019 or the engine wash (which they failed to dry properly causing moisture in some wiring terminals) or maybe the air filter box that was left open in the last PMS appointment I had in May 2019 or because I tried shifting gears manually with the "Sports mode" in an automatic tranny. I completely have no idea.

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post #2 of 17 (permalink) Old 07-06-2019, 11:08 AM
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A friend had a similar problem in their non-kia vehicle which seemed to happen mostly around 45-55 during acceleration. It didn't throw any codes. Turned out to be a ignition coil issue. You don't indicate how many miles on your vehicle or if you are approaching 100k which is typical for replace spark plugs. I drive sport mode all the time in my 2012 Sorento when I'm merging on an on-ramp or in hilly terrain. I don't have that problem.
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post #3 of 17 (permalink) Old 07-06-2019, 02:59 PM Thread Starter
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Originally Posted by ediamiam View Post
A friend had a similar problem in their non-kia vehicle which seemed to happen mostly around 45-55 during acceleration. It didn't throw any codes. Turned out to be a ignition coil issue. You don't indicate how many miles on your vehicle or if you are approaching 100k which is typical for replace spark plugs. I drive sport mode all the time in my 2012 Sorento when I'm merging on an on-ramp or in hilly terrain. I don't have that problem.
Mine happens randomly from 0 to 30kph and mileage is 84300kms. Booked an appointment with Kia this coming Tuesday and will ask them to take a look at the spark plugs. However, don’t they usually check the spark plugs whenever we bring our car in for PMS? Thank you for your input. I really hope this is not serious.
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post #4 of 17 (permalink) Old 07-06-2019, 03:21 PM
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Spark plugs will show normal. If the igniters are marginal, it only takes one to stop firing such that the plug doesn't ignite the fuel. No saying that this is the problem, just something else for them to look at. Routine PMS? I'm not sure there is such a thing. It could turn into a major profit center for a dealer to recommend maintenance before it's due or there is a problem. Kind of like a 3k oil change when the oil will do 5k easily
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post #5 of 17 (permalink) Old 07-06-2019, 04:01 PM Thread Starter
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Originally Posted by ediamiam View Post
Spark plugs will show normal. If the igniters are marginal, it only takes one to stop firing such that the plug doesn't ignite the fuel. No saying that this is the problem, just something else for them to look at. Routine PMS? I'm not sure there is such a thing. It could turn into a major profit center for a dealer to recommend maintenance before it's due or there is a problem. Kind of like a 3k oil change when the oil will do 5k easily
Will definitely request those to be checked. Oh well, I think I am nearly regretting that l took my car into the dealer when I am so used to getting services from a local garage. It was very timely that all these problems popped out when I transferred service to them.
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post #6 of 17 (permalink) Old 07-06-2019, 09:00 PM
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Sounds like symptoms of a bad CKPS or CPS as well.
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post #7 of 17 (permalink) Old 07-06-2019, 09:31 PM
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Originally Posted by Pbvb1120 View Post
I have been experiencing an intermittent "jerking/hesitation" problem with my 2012 Kia Sorento LX. Yesterday was the worse of it, the car felt like it wanted to break down in the middle of the road while I was trying to accelerate from low gears or make a stop. I just know that it doesn't run smoothly and makes me frustrated because whenever I bring it to be serviced, the mechanics would say that my car runs "okay" and they don't experience the symptom upon test driving, neither they see error codes when hooked into the computer.

It makes me wonder if this is related to the ECU software recall update that they did in Feb 2019 or the engine wash (which they failed to dry properly causing moisture in some wiring terminals) or maybe the air filter box that was left open in the last PMS appointment I had in May 2019 or because I tried shifting gears manually with the "Sports mode" in an automatic tranny. I completely have no idea.
Ahead of taking it to Kia or another suitable independent service centre, stop by AutZone and have the error codes read, and that should give you pointers to what's causing the severe misfire.

Diagnostics are needed, and doing anything such as replacing crank and cam position sensors etc. is , guessing and likely to cost you more in the long run.

Quality and not quantity counts.

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Last edited by ron1004; 07-07-2019 at 05:51 AM.
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post #8 of 17 (permalink) Old 07-06-2019, 09:35 PM
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Will definitely request those to be checked. Oh well, I think I am nearly regretting that l took my car into the dealer when I am so used to getting services from a local garage. It was very timely that all these problems popped out when I transferred service to them.
The service shops don't check spark plugs if they're not due for replacement, and there's no misfiring taking place.

Of course, any service shop will pull the plugs if you ask, ....... they'll welcome the opportunity to charge you more.

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post #9 of 17 (permalink) Old 07-06-2019, 10:12 PM Thread Starter
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I actually stopped by OK Tire and have it checked today, they couldn’t find an error and just advised me to take my car into a Kia dealership which they said would most likely have specific diagnostic tools for my concerns.
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post #10 of 17 (permalink) Old 07-06-2019, 10:18 PM Thread Starter
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Originally Posted by ron1004 View Post

Ahead of taking it to Kia or another suitable independent service centre, stop by AutZone and have the error codes read, and that should give you pointers to what's causing the severe misfire.

Diagnostics are needed, and doing anything such as replacing crank and cam position sensors etc. is , guessing, is likely to cost you more in the long run.
I suddenly remember the first time I had that jerking movement they ran diagnostics and found 2 error codes related to transmission. From there they reassured me it was just because of the moisture buildup after the engine was washed, then they cleared them out after it has been dried off properly.

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