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I have a 2008 Kia Serento. Starting from two months after I got the vehicle to now ( 2013) it has been in the shop 5 times with the ASC light coming on and causing it to loose power. The dealership has given me the run around. They have replaced random things and it just keeps happening. I was told by a independent mechanic the the throttle sensor is loosing voltage and until they find that issue they can replace all the parts they want it is not going to fix the problem.

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  • 167 Answers

While that is one remote possibility the decision by the engine computer is made by what is called a "rationality check". If the "throttle angle" from the throttle body does not agree with the signal from a MAF (Mass Air Flow) sensor (easily damaged by gause/oil aftermarket air filters like "K&N" style) or MAP (Manifold Absolute Pressure) sensor and engine rpm it will decide to limit the system as it is not able to control the engine reliably.
Observing the engine processed data with a scanner and calling up the FF (Freeze Frame) data from the engine computer should help locate the problem reliably. Bad engine or frame battery grounds or excessive voltage drops from powerful aftermarket stereos can also cause false error detections.

Posted on Oct 14, 2013

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6ya6ya
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Posted on Jan 02, 2017

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fastboyz
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SOURCE: Diagnosis Code PO174

before replacing parts i always like to clear the code and see if it comes back .
there could be a fluke that set the code or poor fuel could also cause this code.
i would continue to drive and see if the code comes back and if it does find a independent garage and get a second opinion. and just play dumb and see what they say.
good luck

Posted on Nov 13, 2008

  • 2 Answers

SOURCE: Car won't start

k is there power to fuel pump? yes,,, check grounds..... NO check relay only get kia relays for main and fuelpump since o2s run on the same relay,..... if relay is good suspect comp.... mine has same problem with no power to fuel pump i have now traced problem to ecu sux but at least it has a new fuel pump and relay lol.....

Posted on Mar 02, 2009

  • 84 Answers

SOURCE: Hesitates upon acceleration & will not maintain a steady speed

i had found a problem with a kia rio. it was saying tps sensor but after a couple of hours and alot of cursing it turned out to be the maf mass air flow sensor. these are expensive so i suggest that you take it to a kia dealer to have it tested or find someone who can do it for alot cheaper

Posted on Apr 28, 2009

messstat
  • 365 Answers

SOURCE: Zero throttle response and sluggish accelertation

Wow, great description...I suspect the catalyst is bad...(in the exhaust) but try this cheap fix.
go to Advance Auto Parts and buy a can of "SeaFoam" ($8) and following the directions add to fuel and drive for at least 100 miles...see if that helps...if not, have a mechanic look at the catalytic convertor/exhaust
Good Luck

Posted on Jun 15, 2009

  • 94 Answers

SOURCE: 2004 SRX Sputters, looses power, and stalls, on occasion

You would be better off going to a Cadillac Dealership and paying the diagnostic fee. Spend $65 to find out what the real problem is rather than replacing parts until the car runs properly. This way you get it from a Cadillac Technician. Once you know what the problem is you can decide on where you want to have it service. Because you are paying for the diagnostics you shouldn't feel obligated to have it done at a Dealership. Please leave me good feedback if you feel this has helped.

Posted on Jul 09, 2009

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