Cruise Control problems of the 2017 Toyota Corolla

I had to drive around 600 miles to and from family funeral. As others have reported the cruise control on a down hill slope goes out of control. As I reached the top of a hill and started down the cruise control would accelerate to 4000 rpm ( it is really loud) the speed would start increasing and go 15-20 mph over what the cruise control speed was set at. I had to turn off the cruise control to regain control over the speed. I was afraid that something might happen if I did not. Where it seemed my car should down shift it was not. Something is wrong with the programming of the cruise control. This should not happen on a decline. Also, at one point when I was in the left lane and a car passed me on the right, my car slowed down really quickly. If someone had been behind me it could have caused a serious accident. This is my fourth Toyota and I have never had these problems before.

When going down hill, the cruise control races the engine into high rpm (4000+ rpm) rather than slowing the engine and controlling the car speed. It has done this since it was new.

When cruise control engaged, if it hits a level or down hill it appears to down shift, but continue to speed up. It should just reduce the fuel to slow down. This appears to be a program problem. This happens at all speeds. It was bought used from a Toyota dealer. I have not asked the service department yet.

While driving down a downgrade with the cruise control engaged and set to 65mph, the cvt transmission downshifts, the rpms increased and the vehicle accelerated to well over the speed limit. It felt like I was losing control. I had to activate the brakes to disengage the cruise control in order to reduce my speed to below the posted speed limit. I tried it again on another downgrade and the same situation was duplicated. The car will also engage rpms when you are downgrading or upgrading in cruise control I did not take the car into a dealer since the issue has been reported to dealerships with a solution to this problem.

When going downhill on cruise control my Corolla's rpm's go up to 5000 and instead of keeping stable speeds it increases the speeds. I feel like I can't control my vehicle when this happens. This is a huge safety issue. I'm not sure if something needs to be re-programmed but I've seen so many complaints on this issue. I wouldn't be surprised if a wreck has happened because of this. Toyota needs to be forced to fix this issue before someone seriously gets hurt or dies.

As others have reported the cruise control on a down hill slope goes out of control. As I reach the top of the hill and start down the cruise control will accelerate to 4000 rpm and the speed will increase 10-15 mph over what the cruise control is set at. I must turn off the cruise control to regain control over the speed. Something is wrong with the programming of the cruise control. On down hill the cruise control should be reducing fuel to maintain speed not increase it. I am a police officer and this cruise control is a hazard.

While driving down a downgrade with the cruise control engaged and set to 65mph, the cvt transmission seemed to downshift, the rpm's increased and the vehicle accelerated to well over the speed limit. It felt like I was losing control. I had to activate the brakes to disengage the cruise control in order to reduce my speed to below the posted speed limit. I tried it again on another downgrade and the same situation was duplicated. I did not take the car into a dealer since the issue has been reported to dealerships with a solution to this problem.

Adaptive cruise control causes the car to down-shift unnecessarily on a straight downhill grade and sometimes increases the speed by as much as 8-10 mph. I feel out of control, which is dangerous. A Toyota technician has confirmed the same behavior on another 2017 Corolla. On one occasion, on a freeway downhill where the speed could have easily been controlled by letting off the gas, the car downshifted to d3, revs went to about 4000, and the speed increased to 70mph - when it was set to about 62. On another occasion, on a relatively flat, straight freeway road, it again downshifted for no apparent reason, and the speed again increased over the set speed (of course the revs were higher again). In both of the above cases, there was no car or other obstacle in front of me that should cause the car to slow down. I've seen the adaptive cruise respond to a car too close so know how that feels.

The cruise control is just awful and has been since I bought the car brand new in December 2016. Just as several others have described, it cannot control the speed when going down hill. It raises the rpm's trying to slow the car down, but it isn't very effective. I've never had another car or another Toyota have such poor speed control. So much, that I don't even bother trying to use it anymore. A cop isn't going to listen to "my cruise control wasn't working right" if I get pulled over. The brakes already feel like they are wearing out at 26k miles. My 13 camry had 30k and the brakes still felt brand new. Same with the 15 sentra I had. The suspension feels rougher and is starting to make noises already. This car shouldn't feel like it has 60k miles on it already.

The vehicle does this 100% of the time. When on the adaptive cruise control on the interstate there are occasions where the cruise will go 14 mph above the set limit and the engine is at 4000 rpm or higher. I typically drive at 65 mph on the interstate; this is causing me to go to over 75 mph while the system is trying to recover back to 65mph. I also own a 2017 Toyota rav4 and drive the same roads; the cruise is 'rock steady'. It holds at a constant 65mph.

Disappointed with Toyota on this, last one I will purchase if they are unable to provide a fix! while in motion on every occasion the cruise control is engaged and the vehicle is on a decline the cruise control does not maintain the set speed. This is the first time of 4 other Corolla's I have owned that responded like this. Depending on the severity of the decline the speed will increase from 5 to 15 mph and the engine revs to 4,000 rpms in an attempt to maintain speed. Adam's Toyota dealership has stated that this is a normal occurrence for all 2017 Corolla's cvt's and I maintain it's not and cruise is useless therefore I should be reimbursed. The cruise control in all other vehicles (prior Corolla's and other makes) I have owned has maintained a consistent speed no matter the road being traveled. Since I have owned this vehicle this issue has occurred every time I have engaged the cruise control. Others online have complaints on this issue as well. Toyota please provide fix.

I just purchased a 2017 Corolla xse in Feb 2017. The first time it happened I had the cruise control on and was traveling to work at 05:15, and I came to an overpass and on the way down the normal overpass over a cross street, I heard the engine rev and I looked at the tach, and it was at 5000 rpm. I was startled. The same thing happened at the next overpass. This time it was 4000 rpm almost at the bottom of this rather short average downhill. This is still happening, but occasionally it does not. How could this possibly be correct. I can control the speed quite nicely with my foot on the accelerator without hardly any variation of my rpm's. This just doesn't make sense. I am not talking about a long downhill road that has a lane for trucks on the right, where they would have to downshift to maintain a safe speed, this is just overpasses on a freeway system. I asked my salesman, and he said that it was probably normal, and I said how could it be normal for this thing to rev at 5000 rpm on a houston freeway? I only have 5000 miles on this car. This will definitely affect the mileage. I am beside myself at this point.

While using cruise control on fairly level roadway, (rural road) at a speed of 45 mph, the rpm were about 1500, but increased suddenly to about 4500 rpm. After awhile the rpm would drop back down to normal for the speed situation. This occurs also at highway speed of 60 mph in our area. This occurrence has happened many times. Have returned to dealer twice now. Problem was observed by service manager and local Toyota rep who was in town for local auto show. Car was analyzed and data send to engineer in California who later said car is behaving normal. I found that hard to believe as both loaner cars (2017 Corolla) did not behave in this dangerous fashion. I feel this quick brush off by the engineer (tanaka) who is only observing data and not having to drive this car is wrong. I feel the computer should be adjusted for the cvt to solve this problem. Wife does not feel safe driving this vehicle. We have taken 3 videos to document this event.

When the cruise control is engaged and the vehicle is on a decline the cruise control does not maintain the set speed. Depending on the severity of the decline the speed will increase from 5 to 15 mph. When using the accelerator pedal and maintaining the exact same pressure the vehicle only increases speed minimally (2 to 3 mph) on the decline. When in cruise control the speed increase is very drastic. The Toyota dealership has stated that this is a normal occurrence and that they have tested several same model and year Toyota vehicles and all have the same speeding tendencies so this is normal. The dealership stated that the fix is to engage the manual transmission mode to use the engine compression to slow the vehicle down. I have followed there advice and this does not rectify the problem. The cruise control in all vehicles I have owned is used to maintain a consistent speed no matter the terrain being traversed. This issue has occurred every time we have engaged the cruise control on the vehicle while driving on a highway that has a decline.