This is a dangerous problem and I expect Honda to have a major recall some day, unfortunately not today. Symptoms were two things, 1) ACC when on would not slow down with another car in front, it just kept accelerating into the car until I put on the brakes. Crazy dangerous. 2) The collision warning light would come on and beep loudly when there was no possibility of collision. Required replacing the radar unit, $5000 at the dealer.

Dealer tech said that this unit is connected to every control system, brakes, steering, etc. Very dangerous to drive without a correctly functioning radar. If I could, I would just turn those features off, but you can't. Besides, I like those features.

Car is 5 years old; my last payment is in August!

Otherwise, love the car.

Adaptive Cruise Control, Lane Keep Assistance, and Collision Monitoring System all fail INTERMITTENTLY.

When they fail, they all fail and cruise control doesn't work along with all other related safety features. When they don't fail, the car runs well.

Taken this to two dealers for diagnosis - first said it was the optical camera ($2,500) and second said it was the microwave radar ($3,500+) but neither would guarantee that replacing the part would eliminate the intermittent failures. So I didn't fix it.

While driving, my dashboard lit up and I lost the Collision Mitigation System, Assisted Cruise, Anti-Lock Brakes, etc. Limped the car to a Honda dealership and was told this was due to the radar camera - that I had had a collision, which was not at all the case. The car has sat in my garage or driven locally until that one trip. There was no apparent injury to any of the bumpers or cowlings (front and bottom). Dealer assumed, from the beginning that this was my fault.

I contacted my collision insurance carrier (because I was away from home without a car), who had them replace the [beefy] bracket holding the radar (dealer had indicated the bracket was bent). After "re-focusing" the camera, this did not solve the problem, requiring replacement of the camera. I indicated that this was a warranty issue (I have purchased an extended warranty), but the dealer was resolute that the camera failed because of "an accident". This has cost my insurance company $6500 to repair, with the indication by the dealer, that, should I need to have the camera(s) re-focused down the line, this would cost another $3000.

Let this be a warning to any 2017 or newer Honda Hybrid, CRV, etc. owners that the new Honda "Intelligent" systems are costly and hardly worth their price. My system failure totally incapacitated the car, requiring a costly fix, with the dealer, seemingly, relishing the fact that they could make lots of money by it. The dealer indicated during the fix, that they had 6 camera "re-focusings" during that very day (@ $3K each!). I would not recommend this to anyone.

Update from Jun 2, 2019: To make matters worse, this vehicle was purchased as a "Certified Pre-Owned" vehicle from Honda. I have put minimal miles on it since purchased and now, with this problem and having to get my collision insurance provider involved, will now show in Carfax as a car that has had an accident (because of the fixing dealer's resolute position that I had an accident, which I have NOT), making this car difficult to sell. I see that there is a CRV legal case pending for this very same issue. Seems to me that the Honda Hybrids should be included in this case.

Update from Jun 4, 2019: I need to update this complaint as part of the Honda Sensing system, which shows up on the search metadata.