Issue with Honda Sensing Adaptative cruise control

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This happened to me 3 times: highway speed and full stop traffic ahead (or very slow traffic speed). The ACC does not detect cars ahead with enough time to apply brake to stop the car. One time I decided to fully test it and I had to do an emergency brake (full physical break, not the regen brake...). Even the “brake signal” was late.

My salesman is aware of this (he saw that on another Clarity), but told me that he didn’t see that on other Honda models.

My previous car (Subaru Outback) didn’t have that issue and detected and stopped correctly on full stop traffic.

Am I the only one with this problem?

Note: my English may not be perfect since I’m French Canadian...


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bbb0bbb said:
This happened to me 3 times: highway speed and full stop traffic ahead (or very slow traffic speed). The ACC does not detect cars ahead with enough time to apply brake to stop the car. One time I decided to fully test it and I had to do an emergency brake (full physical break, not the regen brake...). Even the “brake signal” was late.

My salesman is aware of this (he saw that on another Clarity), but told me that he didn’t see that on other Honda models.

My previous car (Subaru Outback) didn’t have that issue and detected and stopped correctly on full stop traffic.

Am I the only one with this problem?

Note: my English may not be perfect since I’m French Canadian...


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Click to expand...
I've noticed it a couple of times and guess I just ignored it as a quirk - maybe it's not.
 
I won't call it a problem because I haven't read the Honda verbiage on exactly how it should operate but I have seen the same operation. If it's already following someone it's fine but if you're even going 45 mph towards a group of stopped cars it's really an uncomfortable feeling. If I'm using ACC and not following I go ahead and tap the regen paddles or brake pedal if I see stopped cars.

What I really hate is that it will slow me down very rapidly when the car in front of me exits a highway and I'm continuing on - really bloody annoying!

geo
 
The reason I call it an “issue” is that I drove different cars and I didn’t have that issue. This is a security feature (full stop) that is supposed to help to save life. I know, drivers must always keep an eye on the road when driving, but the purpose of Adaptative Cruise Control is to follow traffic, react and stop... other automobile makers have this implemented correctly. Even the brake signal should alert you before (mine is set on “normal”)


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There is an interval button on the right side of the steering column that will control the distance acc will follow and begin to apply the brake. It can be set to short, middle, long and extra long. I generally set mine at long or extra long and it does respond somewhat better. However, I rented a 2017 Toyota Corolla with acc and it worked a lot better than the Honda Clarity does at any setting.
 
Bbb0bbb, first of all, your English is superb, and much better than my non-existent French.
My ACC slows and stops behind traffic very consistently but my complaint is that it can be a little jerky at times (especially on low speed follow) and is way too slow in resuming speed (have to use pedal or those behind me get mad).
May I suggest you check the Honda emblem on grill (radar sensor) and the camera on windshield to see if they are dirty. Also next time this happens look at the car icon on the ACC display. It will be filled in when it senses a car and just an outline if it doesn’t sense a car in front of you. If it’s not turning solid white with a car within range of you, then it’s not going to brake because it’s not sensing any thing there.
It might help to get your Sevice Dept. to test drive it and see if they think it’s working within normal parameters. If not then maybe a warranty fix is called for.
Finally, the lawyers at Honda have covered their corporate hindquarters by stating that it may not work all the time and that you should use your brake to maintain a safe distance. I’m with you though; if it’s that inconsistent, I wouldn’t trust it even while paying close attention.
 
The manual is pretty specific that the Clarity's adaptive cruise control doesn't detect stopped cars ahead; it'll detect a vehicle that stops that you've been following while within radar range, but if the ACC says you don't have a car in front of you it's not going to see one that's stopped/very slow when it gets into range.
 
dstrauss said:
I've noticed it a couple of times and guess I just ignored it as a quirk - maybe it's not.
Click to expand...
IF Teslas can't be counted on to stop in that setting (see latest news) I don't think anyone should expect cars to drive unassisted.
 
lordsutch said:
The manual is pretty specific that the Clarity's adaptive cruise control doesn't detect stopped cars ahead; it'll detect a vehicle that stops that you've been following while within radar range, but if the ACC says you don't have a car in front of you it's not going to see one that's stopped/very slow when it gets into range.
Click to expand...

Thank you for the specifications. Anybody has another Honda model to compare radar range (since my salesman told me that other models don’t have that behaviour)?

Just sad that my old Subaru (3 years old) can do it and not this new car.


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lordsutch said:
The manual is pretty specific that the Clarity's adaptive cruise control doesn't detect stopped cars ahead; it'll detect a vehicle that stops that you've been following while within radar range, but if the ACC says you don't have a car in front of you it's not going to see one that's stopped/very slow when it gets into range.
Click to expand...
But in that situation shouldn’t the Collision Mitigation Braking System brake the car. Mine beeps and BRAKE light goes on and I use pedal before it applies brake. Usually happens when I run up on a car in front of me that is slowing down to turn. This has been rather consistent for me so far.
Manual does state that it may not completely stop the car in all instances and that pedal braking should be used if necessary. Even states it will work for pedestrians but none of my friends have volunteered to help me test it.
 
KentuckyKen said:
But in that situation shouldn’t the Collision Mitigation Braking System brake the car. Mine beeps and BRAKE light goes on and I use pedal before it applies brake. Usually happens when I run up on a car in front of me that is slowing down to turn. This has been rather consistent for me so far.
Manual does state that it may not completely stop the car in all instances and that pedal braking should be used if necessary. Even states it will work for pedestrians but none of my friends have volunteered to help me test it.
Click to expand...

Yes, the CMBS and attendant warnings should kick in if you are in imminent danger of rear-ending the car in front of you when you're on ACC (or not), but CMBS is designed for emergencies not stop-and-go traffic. It's not going to gradually slow you down like ACC would if the car in front of you isn't jamming on the brakes.
 
lordsutch said:
Yes, the CMBS and attendant warnings should kick in if you are in imminent danger of rear-ending the car in front of you when you're on ACC (or not), but CMBS is designed for emergencies not stop-and-go traffic. It's not going to gradually slow you down like ACC would if the car in front of you isn't jamming on the brakes.
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My ACC in LSF is reliable, just a little jerky. Seems to work fine the few times I’ve tried it. But as megreyhair said, I wouldn’t bet my life on it.
 
K8QM said:
I won't call it a problem because I haven't read the Honda verbiage on exactly how it should operate but I have seen the same operation. If it's already following someone it's fine but if you're even going 45 mph towards a group of stopped cars it's really an uncomfortable feeling. If I'm using ACC and not following I go ahead and tap the regen paddles or brake pedal if I see stopped cars.

What I really hate is that it will slow me down very rapidly when the car in front of me exits a highway and I'm continuing on - really bloody annoying!

geo
Click to expand...
I have noticed exactly this behavior often and it IS annoying (and possibly more annoying for people behind me).

1. Will not kick in ACC slow down if car in front is already stopped - can be nerve wracking.
2. Will stop suddenly if car in front is turning right even if the road beyond that car is clear. It then takes a while to get back up to speed.
 
While using ACC and following a car, when other car moves into in front of my car, beep and break warnings is shown on screen. It doesn’t seems to breaking, so I panic and break, did anyone had similar experiences?


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HariN said:
While using ACC and following a car, when other car moves into in front of my car, beep and break warnings is shown on screen. It doesn’t seems to breaking, so I panic and break, did anyone had similar experiences?
Click to expand...

All the time. I've never had the car actually brake on its own - even when I've got really close.
 
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