NHTSA Complaint #11500844 — 2021 HONDA PASSPORT

On October 29, 2022, the CMBS emergency braking system slammed the brakes on for no obvious reason. This happened at least four or five times while traveling eastbound on I-40 in AZ. There were no cars in front of or changing into my lane. After it happened a few times, I called the dealer RSM Honda in Rancho Santa Margarita, CA, where i service the car to see if i could turn it off. They suggested reducing the sensitivity, which I did. After changing the sensitivity, I still experienced two or three more incidents of surprise emergency braking for no reason. After the fifth or sixth incident, I pulled over and searched a pdf copy of my owners manual and found a way to turn off the CMBS with a button on the dash. This worked to stop the braking incidents, but I had to do it over again every time I restarted the engine after stopping for gas, etc. This scared me and was dangerous as this would happen while i was going 70 mph. I think every instance occurred while I was passing a "big rig", but I was never in the same lane as the truck. Sometimes it was on a very gentle curve, but other times we (truck and I) were both going straight down a straightaway. I had done similar trips previously in February, June, and July without having this issue, but had it happen multiple times on my October trip as described above.