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!!!
View 15 Replies2012 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?
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?
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?
View 20 RepliesThe 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...
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?
View 7 RepliesI 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?
View 9 RepliesJust 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.
View 14 RepliesMy 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.
View 3 RepliesIf i am driving say for 15 mins on the highway at 65-75 mpg with a few brakes and accelerations in between due to other cars around, is it better to use the cruise control (i have adaptive cruise control on my prius v) and let the car figure out the throttle and braking or is it better to just drive by myself without using cruise control? i read about the different pulse-glide driving methods.
View 19 RepliesAs odd as it may sound, our Prius salesman told us we should not use the cruise control on our 2010 Prius II for the first 1500 miles. We could not find any such warning in the manual. Did we just misunderstand or was the salesman correct?
View 10 RepliesAbout 2 months ago, I was driving and my cruise control wouldn't engage on the highway ... I happened to be right near the dealership so I immediately returned there .... didn't turn off the car, but the tech put it in P while I was waiting. I was so ticked off because I thought that may have 'reset' things, and of course when the tech took the car for a drive (in D) the cruise worked fine. We of course never confirmed that the cruise control didn't work.
Today, the same thing happened at the same place, so I returned to the dealership, calling them on the phone, and informing them that I would not turn the car off, or allow the car to be put in park. The service manager met me out front and we went for a quick ride so I could 'prove' that the cruise was inoperative. He confirmed that it was not working, and why. For some reason, I glanced at the dashboard and noticed that the car was in 'B' mode. I mentioned that to the manager and he noted it as well. I must have bumped it somehow while driving as I NEVER use B mode for anything ... ever. I said I wondered if that was the reason, and put it in D, and lo and behold, the cruise worked again.
I haven't checked the manual yet to see if this is stated there, but the cruise control is inoperative if the car is in B mode. Or at least it seems that that is the case. Other than the car being in B mode, it acted just like it always does, and since I was on the highway, I never noticed the braking effect that B mode gives you.
I've heard that cruise control reduces mileage. This was in relation the Honda Civic Hybrid (Gen II).
View 17 RepliesMy cruise control all of a sudden stopped working today.
View 7 RepliesNo cruise control, ABS, Brake and skid light on (Prius 2010).
View 12 RepliesI have had my 8 month old Prius for a week. I have used cruise control fine before and after the incident. All of a sudden we started slowing down. Doing any thing on the cruise control had no effect. I canceled it. But every time I pressed the accelerator I just got the amber warning light come up and the car beeped at me and no acceleration. The cruise control didn't get the car going either. I had to stop on the motorway. Put the car into park then put it into drive and drove off fine and the car has worked fine since.
View 10 RepliesNot sure if this should be under the technical section but is there a way to modify the cruise control to be set to a position on the hsi and not based on the speed. After all it is all electronic.
View 7 RepliesWe have 2 trips coming up this summer (600 miles and 1400 miles), these will be my first long distance with the Prius.
Did anyone tested fuel economy using the cruise control in ECO vs NORMAL vs PWR ?
Is the drcc on the 2013 full-speed range or is it partial speed range? (will it bring the car to a stop or does it only work above certain speeds?)
View 18 RepliesWhat are the most and least optimal times to use cruise control at highway speeds?
View 16 RepliesI 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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