Engine control lamp comes and go!

Question edited for clarity and better English.

The most common reasons a Kia Rondo cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.

Kia Rondo Cruise Control Not Working - RepairPal

https://www.google.com/search?q=2012+kia+rondo+cruise+control+not+working

Cruise control is a computer operated feature operated from the ECM.

KIA Rondo (2007-2012) fuses and relays

Fuse-Box.info https://fuse-box.info > kia > kia-rondo-2007-2012-fus...

The fuse box is located behind the cover on the driver's side of the instrument panel. The location of the fuses in the passenger compartment: KIA Rondo (2007- ...

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You obviously need to check your O2 sensors and or T-body.

I’m happy to assist further over the phone at https://www.6ya.com/expert/howard_977676954994c5b2

Looks as if it is a 4amp fuse and power comes from the headlight switch. Do park lights work? Looks as if 20amp fuse to headlight switch controls park lights and possibly power supply through switch to 4amp fuse. This diagram is for a 6cyl and should be the same as an 8cyl. Hope it helps

You have a MIL Lamp on ,so you have codes

Get the codes & diagnose them

Why would a shop tell you what to do & not look at
data & road test?

Their giving away work & failed to diagnose or test
for the problem,whatever it is!

Ok two things here.... first what color is it....Blue meens you have bad rings or bad valves, white with the smell of anti freeze meens you could have a cracked head or blown head gasket. Sorry..... hope this helps. Oh i forgot one....black meens your getting way to much gas.....

CHECK ENGINE LAMP

Monitoring the operation of the various inputs and outputs is what on-board diagnostics is all about. When computerized engine controls went nationwide in 1981 to comply with federal emission regulations, the "Check Engine" lamp became a new feature on the instrument panel.

The "Malfunction Indicator Lamp" (or MIL as it is called today) is supposed to alert the driver when a problem occurs in the engine control system. Depending on how the system is configured and the nature of the problem, the lamp may come on and go off, remain on continuously or flash. Some types of intermittent problems will make the lamp come on only while the fault is occurring. When the problem goes away, the lamp goes off. Other types of problems will turn the light on, and it will remain on until the fault is diagnosed and repaired.

The Check Engine lamp has proven to be a great annoyance to many motorists (as well as many professional technicians) because it seems to have a mind of its own. For one thing, it doesn't tell you anything about the nature of the problem. It might be something serious - or it might not. There's no way to tell without plugging in a scantool, such as AutoTap.

Consequently, many motorists ignore the warning light and keep on driving if they don't hear, feel or smell anything unusual (even then, some continue to push onward until things get worse or the engine dies altogether). It's amazing the lengths some people will go to just to avoid a quick diagnosis when the Check Engine lamp is on. Many people don't really want to know what's wrong with their vehicles because they fear it will end up costing them several hundred dollars to get it fixed. So they'll put tape over the lamp, attempt to disconnect the bulb or cut the wires to the bulb - in an attempt to make it go away. But engine performance problems don't go away and they don't fix themselves. And for motorists who live in areas with vehicle emission testing, the day of reckoning arrives sooner or later since modern emissions testing uses a scantool to check if the Check Engine lamp is on, and if the light has been tampered with. Whenever the Check Engine light comes on, a "diagnostic trouble code" (DTC) is also recorded in the on-board computer's memory that corresponds to the fault. Some problems can generate more than one fault code, and some vehicles may suffer from multiple problems that also set multiple codes.

Good for you.

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Sounds like you could have gotten some water in your fuel tank from that fill up. Go to a autoparts store and get a product to put in the tank that takes care of water in fuel. Use it when you fill the tank up a few times after and hopefully it goes away. Whenever you can't sustain power in the engine or it runs rough then your cruise control will constantly be shut off because the engine doesn't have the power to keep the speed up and should go away once your engine is running clean again.

Good Luck

Sounds like the ground wire for the battery is not making clean contact. Trace that wire and clean both ends and the area it connects to the engine block. Good luck!

Hi if the coolant sensor is not working that would give you cutting out its up by the theremostate at the front of the engine.with two wires runing to it. 

Try replacing the air mass meter