[JRRF]

Sometimes the ACC freaks out while you are trying to reset it while driving. Try turning the ACC off completely (not just deactivated), then get back up to speed, turn the system on again, and activate it at your desired speed. I find that frequently fixes the problem.

I will take this opportunity to vent a little about the ACC. GM's system is full-stop/start which is great. But the range of the detector is really short compared to other manufacturers. If you are coming up on slow traffic, the system gets way to close for my comfort before it senses the slowed vehicles and then reacts. It also stops way too close to the vehicle ahead, regardless of the gap setting. It's unsettling to come within a foot of someone's bumper before full stop. There is no room for error if the system should malfunction. I don't even stop that close to people on my own.

 

[JRRF]

I think GM was super conservative in how they implement the ACC to reduce a lot of potential accidents that they would be blamed for. It is just part of the pains of deploying new technology.

Always remember not to fully trust the ACC to pull you through in every cases. It is a software that processes sensors. Software have bugs and sensors could fail and it is your life on the line.

I guess you never plan on getting in a self driving vehicle. It's all software and sensors. And just like software has bugs, so does hardware -- like your brakes for that matter. There is nothing fool proof, but the system should be better than it is. I've used ACC from Volvo, MB, Chrysler, Acrua, and BMW. They are far superior. On the flip side, Mazda has ACC that isn't even full-stop. That's a first generation system.

 

[JRRF]

I have experienced totally same thing what you are talking about.
I've learned that I should not activate acc to the fully stopped vehicle ahead.
barely avoided crash on my second day and third day.

Even worse on this car is that the ACC uses the regen braking to start. So if/when you take over with the real brakes the car will surge forward for a moment before the real brakes kick in.

 

[JRRF]

Especially with Tesla's. Remember the fatalities. I wouldn't be the sacrificial eager beaver statistics. I will get fully self-driving cars, but not the first generation. Will watch out for their performance first then upgrade to it later.

I don't disagree with you there. But ACC has been around for more than 10 years. These systems should be pretty solid by now.

 

[JRRF]

Not a problem with me anymore. Based on experience, you should be able to tune how hard you should initally apply brake when you take over before coming gently to a stop.

Yes, but that experience only comes after a few scary situations.

 

[JRRF]

Yup! But it is newly implemented on the Volt. Just like mentioned earlier, perhaps more and robust sensors are needed as well.

It's new on the Volt, but the systems and sensors are off the shelf. There are various vendors that supply these things -- Chevy doesn't make them. I might have bought an argument about integration with regen braking, but Tesla has a VERY advanced system that has been using regen for years.