My CMBS has malfunctioned twice. There are no vehicles in front of me and when I went to accelerate from a stop the auto brake engages for a short period. This can be a very hazardous fault and is apparently very hard for mechanics to catch/troubleshoot.
This is the third Accord I've owned, and none of them have been issue-free, but this one (2020) is the worst.
I bought this car late market (in March of 2021) with only 6 miles on it. Within a week it started to throw occasional notifications, which I called the dealership and asked about. They assured me that it was just a hiccup and to bring it in for a factory reset. They performed this reset, and the car appeared to be fine after that.
BUT - Less than two weeks later, it started showing the four LKAS/CMBS lights and dash prompts - brake system problem, road departure mitigation system, collision mitigation braking system, and adaptive cruise control system 'problems', each saying 'see your dealer'.
Made an appointment to bring it back in, and on my way to the dealership - having the car for only one month at this point - I was rear-ended by a pick-up truck at the red light turning onto the dealership street (he admitted he wasn't paying attention). Long story short, the car was repaired, Honda factory specs were (supposedly) restored, set and verified, and my car was returned to me. It was fine until about another month later, when it started to show the alerts again - more frequently than before.
Contacted the dealer again, asked for troubleshooting assistance again, and they said they were booked out until the following week. I took this time to start looking for this issue on-line, and found several incidents of other Accord owners, experiencing these same issues plus several others (of which I also had a few) - most saying no matter how long the service shop had their car, the issue did not get fixed. NOT ONE. I could not afford to be without my car for an extended period of time, so I continued my research and saw even more issues, again none of which were able to be resolved by the dealers, so I canceled my appointment and resolved to just 'live with the issues' as the actual car performance did not seem to be affected.
It has now been ramping up, now happening pretty much every day, and I'm sick of it. The alerts pop up almost immediately upon ignition, and they all flash - one at a time - as I am driving; coupled with the other issue this car has (in a separate post - acts like it is running out of gas), it is most definitely a lemon and Honda needs to DO SOMETHING! If I didn't need this car I would have driven it a la Thelma and Louise by now...
Multiple occasions the collision mitigation brake system will activate when there are no vehicles in front of me. I thought initially it was part of the lane keep assist but this issue occurred after disabling the lane keep assist as well. Dealer told me to simply keep the sensors and cameras clean.
I was driving going 55 mph with no car in front of me and the car came to a hard brake with no warning. It felt like I was going to lose control of the car.
I'm unable to recall times and mileage, but on several occasions, the Collision Mitigation Braking System would activate when there was not a vehicle or object in front of the car. Luckily when I was driving, I did not have any traffic around me when this came on and was off with a few seconds. Wife has reported to me that this happened to her a few times to and from work, either in the morning or evening.
A D V E R T I S E M E N T S
My CMBS has malfunctioned twice. There are no vehicles in front of me and when I went to accelerate from a stop the auto brake engages for a short period. This can be a very hazardous fault and is apparently very hard for mechanics to catch/troubleshoot.
- Steven S., La Verne, CA, US