Sonata I45 (LF 2015+) :: Cruise Control - Transmission Will Downshift To 4th Speed Whenever Go Downhill
Dec 30, 2015
The cruise control on my 2013 works as I expected.
However the cruise control on my 2016 Sonata does not.
When driving at highway speeds (65 to 70 mph) in cruise control and the shifter set on "D" (drive) the transmission will down shift to 4th speed whenever I go down hill.
This might be intentional as a way to keep the car from exceeding the set speed, but I have never heard of this and it would seem to place more wear an tear on the transmissions.
Do the down shifting is engineered in or if it is a service problem that I need to have addressed...
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I have a 2012 Hyundai Elantra and have noticed that my cruise control doesn't slow me down when I am going downhill, is this normal?
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2012 Prius with 10K miles.
One of the features I really like over the '06 Prius is the ability of the cruise control to hold the set speed on downhills (until the battery fills up and it switches to compression braking "B" mode, but that's a different topic).
After taking it in for the 10K mile service, it no longer engages regenerative braking on downhills with cruise control set. This is on the same hills where previously it would hold speed.
Did Toyota do a software upgrade that disables this feature?
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Just picked up an Excursion with the V10 and 4R100 (2001). Drove it in to work to day and while on the freeway cruising on cruise control about 60 it seemed to shift or atleast lock/unlock the trans on ever slight downhill you encounter on a city freeway. Just light humps in the road. Does this seem normal? RPM's would be just shy of 2000 then I'd hit a small decline and would shift to 1600 or so then back up when it leveled out.
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So the problem is that I have a jerky downshift 3-2 and 2-1 that can be felt by everyone in the car (car pushes forward on downshift) until the car warms up. When the car is warm I can feel it slightly at times and feel a clunk when shifting down 3-2 and 2-1. On up-shifts at times the shifts are shaky from 1-2 and 2-3. I have brought this forward to my dealership as well as another one. They all performed software updates and reset the adaptive learning. However every time I got my vehicle back after this procedure I found the A/C was on full blast. So the initial drive by the tech after the reset was learning while the A/C was on. Would this be causing the weird shifting I experience while the A/C is off. I seem to notice a better shifting when the A/C is on but this may just be me trying to reason why my transmission is behaving this way. I drove other 2015 Sonata's and they have much better shifting than my car and no hard jerks on downshifts.
Both dealers have felt the downshifts and have come back and simply said "We've done all the updates and reset and learning. This may just be a normal characteristic of the car." I told them that a brand new vehicle in this day and age shouldn't be shifting poorly when compared to an older vehicle with 300,000 km (my old Honda Civic which are prone to transmission failures). They responded casually saying you can go and get a second opinion from another dealership if you like. I am furious with their responses and just left it at that. I need to know how to get this resolved and if this is indeed something I should expect from my Sonata.
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I have been using ACC a lot during my daily commute, it's really an effortless way to drive the car on a daily basis.
One of the issues I have been running into with it is that sometimes when the car in front (recognized by radar) accelerates and immediately decelerates to a quick stop my Sonata's ACC does not react and apply the brakes fast enough. The car will basically apply some braking power (~50%) while very quickly approaching the car in front, all the while triggering the rapid beeping of the Collision Detection system. Everytime this happens I have always had to manually intervene and apply the necessary braking power to stop short of hitting the car in front. This is pretty ridiculous to me since if the car KNOWS that it will crash without additional braking, and has the ability to apply the brakes, why doesn't it do so properly?
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I love the car and SCC is one of my favorite features. I've had good experience with the SCC most of the time - if car in front of me is moving and then stops, it reacts well. (Also was pleased to learn I can resume SCC from a stop by just tapping the accelerator, no need to hit resume like the LCD screen implies).
However, the one situation is when I'm going like 55mph, and up ahead there's a car stopped completely. I'll see a thing on the dash that the SCC recognizes there's a car ahead, but it won't hit the breaks till the last minute. Truthfully, I end up hitting the brakes myself in most of these situations.
I've got the longest distance selected (though i've tried it with short following distance too) and my car is a Limited 2.4 GDI.
SCC stops fine if slower car ahead stops. Seems a little risky when car ahead is already stopped (waits till the last second for brakes?).
I've also tried changing the setting for cruise control response from "normal" to "fast"...maybe i'll try "slow?"
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When I turn my Cruise Control "On" it will light up green on my dashboard, However when I press the "set" button to set the speed nothing happens. It was working fine a few weeks ago. Could it be a fuse? If so what fuse? How I can fix this? 2011 Sonata
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Twice now, while going downhill hill (steep grade on freeway) my Prius has revved up to over 4,000 RPMs with the cruise control set at approximately 65 mph. The noise of the engine was my tipoff and I immediately had to turn the cruise control off. This just doesn't make sense to me! Seems like this could be a potential problem for those of us utilizing cruise control!!!
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I drive a 2005 Ford Explorer (automatic) with 84k miles on it. Recently when I was driving on cruise control at 35 mp/h down a hill and applied the breaks to make a turn, the engine completely shut off. The lights came on, the power steering went off, the engine had shut off. I pulled over, turned the key off, turned it back on and it started no problem. I drove it for 3 days without problems (and without using cruise control of course), then I took the car to a shop. They ran diagnostics on it, test drove it, but couldn't find anything wrong with the cruise control or the transmission. I don't think they tested this driving downhill as the shop is not in a hilly area. Tonight, I went down the same road again, 35 mp/h in cruise control, slowed down for the same turn, and the engine shut off again exactly the same way it did before. What this could be?
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I like to drive with cruise control engaged but I find I can't do that in my new (well, 182K 2005 6.0L) Excursion. It's holds speed just fine, but if I top a rise and start going downhill - basically when no effort needed to maintain speed - it starts chugging and shaking the whole truck real bad. It feels and sounds bad, can't be good for it (or so I've assumed in my head). It's a real staccato feeling as if fuel is being applied less than a second, stopped, reapplied. Is this something unique to the diesel (my first diesel), an issue with the cruise control (vacuum, electronic?), or what?
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Curiosity question. I've noticed that on a downhill of a couple miles, especially in "braking" mode or with the cruise control on, the motor/generator and engine are used to keep the speed down and the battery gets charged to the very top quite quickly. That's good!
On a really long downhill, will the motor/generator still be used for braking and the excess electricity discarded to keep from overcharging the battery?
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My 2001 F250 with 5.4 gasser surges when it rolls downhill when using the cruise control. It does not do that when it is going up hill or on flat level highway. Why it does that? This is only when I use cruise control.
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The car is a 2010 Corolla S with about 85K miles, I bought used in Jan 2015. This problem mostly happens when I am using the cruise control. I will be going up a hill at about 65 and regularly but not always the trany will downshift with a very hard "bang" like running over a pipe. It will make the shifts in a normal smooth manner at other times going up hills in cruise control. This hard shift is very abrupt and startling if not ready for it. In can do this when not in cruise control if at highway speed in accelerate to pass but not as consistent. It has not done it at in town driving.
I took it to the dealer, as I had a warranty, and took the tech for a ride so he could feel it. I was told the next day the warranty company says this is "normal" behavior. I do not believe this to be normal.
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I have no speed control going downhill with CC at all. Dealer says this is normal. I've had two other Lexus GS models and when going downhill they would downshift and use the engine to maintain a constant speed. My Mercedes does the same thing when going downhill it downshifts to maintain a relatively constant speed. Is this normal with the RX? if so, what a disappointment.
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Is it normal for the car to shudder when downshifting at low speeds. I have had the computer "reset" once before when this happened and the dealer said I needed to drive more aggressively so the computer would "learn" my driving habits. I honestly am more interested in good gas mileage, so consequently I do not blast off from stops. Service manager said I needed to push it a little harder. Is this BS or is there some software adjustment that the dealer can make?
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I'm kind of up against the clock. I am sure this answer is in a book in the car. But that book looked pretty thick.
My husband just told me that he did not want to take my car to the ball game because he can't stand the cruise control turning off every time it gets even close to a car (yes, I understand what this may mean, but I'm not driving with him and he is a grown man).
Is there a way to disengage the automatic turn off on the safety cruise control feature? He likes to be the one in control I suppose.
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I just got a new 2015 Prius C Three and have been reading up as much as possible. I wanted to know if using cruise control would give me better MPG. If it's just a matter of 3/4 mpg difference, then I would use the cruise control to rest my feet. But if its a big difference, then I would avoid cruise control.
My daily commute from Germantown, MD to Alexandria Va and back is about 40 miles each way: total 80 miles. 90% of that highway on I-270 and I-495. I leave after morning rush hour and again drive back after evening rush hour.
Last couple of trips without cruise I have been getting around 50~52mpg.
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2011 Sonata Limited ... I have just under 60k miles and did a tranny drain and refill at 24k and 55k. Just had the brake light switch replaced. For some reason when cruising with the car in overdrive, if I let off the gas to decelerate and ease into the gas again, I get a real hard down shift and shift. So every time I get on the gas again it is either kicking out of overdrive or downshifting and shifting back immediately. 99% of the time it is a hard thump. When I have the cruise set I do not notice this at all. It does it in ECO or out of ECO. This is new and I started noticing this after the brake switch replacement.
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So my 4motion downshifts going downhill while braking...it's annoying as hell! My DSG used to do the same thing but being a faster tranny it was actually NOT annoying... Is there a way to reflash the tranny software? Maybe with an older code because my 06 didn't do this but my 08 does...
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My vehicle shows currently two awkward behaviors:
1) I can start the vehicle using the keyless start button without having to step on the brake pedal.
2) I can switch on cruise control. The green symbol appears, however, I cannot set a speed. The system simply seems to ignore that I press the set button.
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