Question about 2013 Kia Optima

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Does the auto cruise function during down hill after setting the speed?

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Tambu: Yes, the cruise control should hold you at approximately the same speed you set it at even when you go downhill. Sometimes you will see it pick up a pick too much speed, but then it adjusts.

Posted on May 12, 2015

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Posted on Jan 02, 2017

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1 Answer

What causes the speed to fluctuate when you set the cruise control?


if it just started to happen you may have lost a magnet off the drive shaft. If it is a front wheel drive then you would have two magnets on the flywheel if you lost one magnet it would cause problems.
The other possible cause if the sensitivity setting is set too sensitive then the cruise control will surge .
Setting it lower will allow it to slowly respond to speed changes but if going up hill it will take a while to increase the acceleration . Or going down hill it could accelerate too much before the cruise control realises it is going downhill
Also a very wet road can cause the wheels to spin and cause the cruise control to lose the plot and accelerate to dangerous speeds.
I have had this happen to myself once so be wary of cruise control use in wet conditions.

Jan 14, 2017 | 1992 Honda Accord

1 Answer

When cruse is set, why does it not hold going down hill


Cruise control only maintains speed by utilizing the accelerator. To speed up it increases it and during slowing is removes it. The cruise control will not apply brakes in the event of a steep downhill run. In this case the vehicle will start to accelerate in the same manner as if the cruise control was not engaged. But in theses cases, most cruise controls, once the speed exceeds a certain amount above the set speed, will auto-disengage as a safety feature.

Oct 04, 2016 | 2004 Chevrolet Silverado 2500HD

3 Answers

Why does my 98 dodge caravan have trouble climbing hills?


A transmission issue would give vibration tremendously during uphill. If you're not getting the vibration, or burning smell of transmission fluid, suspect clogged catalytic converters.

May 09, 2014 | 1998 Dodge Caravan

1 Answer

Transmission surge at cruise


check the rpm and road speed when this happens . The cruise control will increase to keep RPM constant but as the road speed drops the auto may be shifting down and as the rpm increase it shifts back before the rpm adjusts. You can override a cruise control in this situation by simply pressing down on the accelerator to maintain the power setting and road speed and when the situation is passed and you take your foot of the accelerator the cruise control will return the system to the set position without you needing to do anything

Nov 25, 2013 | Dodge Ram 1500 Cars & Trucks

1 Answer

2010 Nissan Pathfinder Cruise Control issues


First I'll assume you haven't read the owners Manuel, Cruise control is not perfect on any vehicle. if coming to a hill put foot on gas to help rpm, going down hill put foot on brake to keep same speed, cruise control operates off of engine vacuum. Speed sensors can be affected by putting on smaller or bigger tires than what is on drivers door.

May 24, 2017 | 2010 Nissan Pathfinder

1 Answer

My 2011 Sonata cruise control stops working going down steep hills. The set light goes off. I had it set at 50mph but applied brakes when it increased to 70mph. Dealership says they can find nothing...


going down steep hills will all but over ride a cruise control, since the motor is trying to keep the vehicle slowed to what your desired speed that you set , unfortunately this doesn't always work,, as your speed increases, the motor can't keep the speed reduced, when you apply the brakes, the system shuts off, cruise controls were meant to be used pretty much on long flat surfaces with Low inclines ,,

Aug 25, 2011 | Hyundai Motor 2004 Sonata

1 Answer

Cruise control will not maitain the speed it is set on. going up a hill it gets slower and going down a hill it gets faster


My experience is that cruise control works on level roads, uphill you have to control speed yourself same for downhill. Exception is very powerful cars. Did it maintain speeds before? (uphill + downhill)

Mar 08, 2010 | 1994 Buick Park Avenue

1 Answer

What causes a 1998 grand caravan 3.3 liter to lose speed climbing a hill with the cruise set but it will hold the vehicle back going down a hill


you have higher torque need when pulling the vehicle up hill but less going down because it does not require as much power to hold your van back. Hope this helps

Oct 07, 2009 | 1998 Dodge Grand Caravan

2 Answers

Stalls at low speed when in cruise control


You sould have recieved a "recall" notice in the mail about the cruise control for fire and failure issues. they are adding a fusable link where the cruise control harness connects to the brake master cylinder. if you have not had the recall performed yet you should SERIOUSLY consider getting it done, mainly so it doesnt catch fire, but "could" be the result of the failure you've been experiancing! btw, almost ALL Ford vehicles have been affected with the cruise control recall. hope this helps!

Apr 14, 2009 | 2004 Ford Explorer

1 Answer

CVT problem


Simple answer, no, it will not most likely cause any increased wear to your engine or transmission. Yes, it is normal for the engine to rev while climbing a hill while in cruise control.

The cruise is designed to be used on flat (or semi-flat) stretches of highway at 55mph or higher so you don't have to hold the fuel pedal the whole time and your foot doesn't get tired. The cruise control system will try it's best to keep your vehicle rolling at the set speed, increasing/decreasing the throttle to compensate for changes in engine load.

If you are driving with cruise on, try lightly putting your foot on the pedal and you might notice that the system will actually move the pedal itself. If you are in cruise, and you come up to a large hill, try putting your foot on the pedal and getting it up the hill on your own w/o cruise then resetting cruise once you are off the hill.

Also, cruise is not supposed to be used in moderate/ thick traffic or on country roads with a lot of rolling hills. The cruise control system is a "dumb" system meaning (not that it's pointless) but it will only change the pedal as the speed changes and it has no idea what's coming up next, even while you are already on the hill.

So, it is normal operation of the cruise control to try to compensate for a hill by constantly revving up the engine and letting it fall back down to try to keep moving at the exact same speed you set it for. If this is a bother, you can always use your foot to hold the pedal while climbing the hill normally.

Don't worry, it won't cause any increased wear and tear on your vehicle. I hope this helps. Good luck and don't forget to rate! Thank you!

Mar 01, 2009 | Mitsubishi Outlander Cars & Trucks

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