Car was sitting in garage while parked and not in gear.
Serious problems with safety systems (CMBS, etc.)
I have a 2018 Honda Accord 2.0T Touring. I have numerous incidents where the Collision Mitigation Braking System has gone out giving an amber dash warning to see the dealer. When this happens, the cruise control will also not function. Most times, upon shutting off the car and restarting, everything returns to normal. However, one time upon restart all other safety systems (even the turn signals and head-up display) went out. Only the Nav would work. Upon the next restart, all was back to normal. The dealer spent 6 hours in diagnosis and came up with a solution of adjusting a brake switch under the dash near the brake pedal. It did not solve the problem as it has recurred so now they are ordering a new brake switch. Has anyone experienced similar problems? I love the car but cannot continue to use it on highway trips if these safety systems are not reliable. That is the main reason I bought a new car.
Ron
Ron
61 - 80 of 101 Posts
Is it possible to clip a wire or pull a fuse to shut this stuff down?
I've had the CMBS error come up on my car 5 times since purchase in August of 2018. The first time it happened the car had about 800 miles on it. I called and went to the dealership each time. They told me that unless the error warning was still on they couldn't do anything. The last time it happened I was about half way home so I turned around and went back to the dealership with the warning still active. After 2 hours the still had no solution. Hopefully Honda comes up with a fix soon.
This issue w/your car has now been documented which "should" help in Honda looking into this issue, coming up w/a fix, and protect you from any associated cost(s) that would occurre w/that fix if it is found after your original warranty ends. I would think the more cars w/this issue that take their car back to the dealers when this warning is showing should provide them w/information & knowledge to what is going on resulting in a fix.I've had the CMBS error come up on my car 5 times since purchase in August of 2018. The first time it happened the car had about 800 miles on it. I called and went to the dealership each time. They told me that unless the error warning was still on they couldn't do anything. The last time it happened I was about half way home so I turned around and went back to the dealership with the warning still active. After 2 hours the still had no solution. Hopefully Honda comes up with a fix soon.
Well, yet again the CMBS warning came on for the 6th time since owning the car. Today I was headed home from working midnights and there was a light drizzle. This warning seems to be very sporadic. I cant seem to pinpoint what is causing it. I will be calling the dealer as soon as they open to have them document it...again. I really hope they can figure out the problem.
![4353]()
Every time I took my 2018 touring in for this problem, they stated different problems other than ACC. How can they keep a valid database?Honda only does that when you actually bring the car in and it’s documented. And as much as you think they probably don’t, they document and record every single failure. How do you think they put out recalls based off specific ranges of vins. But from a customer standpoint I understand the frustration. Trust me I dislike having to do warranty work on things that should of been caught in quality control.
How does an owner get a copy of these reports?View attachment 4309 View attachment 4310 If your CMBS ever has a activation it stores it in the control unit. Same for the lane departure. So the dealer should of been able to see all instances of it going off even if it wasn’t setting a code. As far as clipping a wire or unplugging something to deactivate it, no. You can turn everything off so that they aren’t active but anything unplugged will set DTC. Especially with the radar unit. If you trigger a misalignment code the only way to reset that is to perform a radar aim which sucks ass.
You can go to your dealer and ask them to print all your service records, having the same issue with my 2019 Accord 2.0 10spd, replaced brake switch, VSA module, and problem still persists and now my dealer is expressing that the car is operating as designed... I’m really hoping to get this fixed, and if I can’t be fixed, get out of this car.How does an owner get a copy of these reports?
I am currently having this problem, however mine was precipitated by a piece of a tire that a driver in front of me ran over, and it hit the front of my car. About 2 seconds after that happened the cruise control stopped working, the cmbs, my horn, and charging system went out. I don't know what is wrong with it. Going to have it looked at today.I have a 2018 Honda Accord 2.0T Touring. I have numerous incidents where the Collision Mitigation Braking System has gone out giving an amber dash warning to see the dealer. When this happens, the cruise control will also not function. Most times, upon shutting off the car and restarting, everything returns to normal. However, one time upon restart all other safety systems (even the turn signals and head-up display) went out. Only the Nav would work. Upon the next restart, all was back to normal. The dealer spent 6 hours in diagnosis and came up with a solution of adjusting a brake switch under the dash near the brake pedal. It did not solve the problem as it has recurred so now they are ordering a new brake switch. Has anyone experienced similar problems? I love the car but cannot continue to use it on highway trips if these safety systems are not reliable. That is the main reason I bought a new car.
Ron
Umm.. that’s because something likely hit the sensor...
the concern is with folks that are having spurious issues with Honda Sensing in cars that have not suffered any damage. It’s likely a firmware or integration issue that Honda hasn’t figured out yet. That’s why I turn off the stupid CMBS every time I use the car....
the concern is with folks that are having spurious issues with Honda Sensing in cars that have not suffered any damage. It’s likely a firmware or integration issue that Honda hasn’t figured out yet. That’s why I turn off the stupid CMBS every time I use the car....
I am currently having this problem, however mine was precipitated by a piece of a tire that a driver in front of me ran over, and it hit the front of my car. About 2 seconds after that happened the cruise control stopped working, the cmbs, my horn, and charging system went out. I don't know what is wrong with it. Going to have it looked at today.
There is a correction for cars that code for ACC turning off while being used. It's a PGM-FI software update.
I got the updated software last week and problem persisted and threw error on my 14 mile drive home the day I picked it up from the dealer.There is a correction for cars that code for ACC turning off while being used. It's a PGM-FI software update.
really? How close are you to cincy?I got the updated software last week and problem persisted and threw error on my 14 mile drive home the day I picked it up from the dealer.
Long ways away , I’m down here in Floridareally? How close are you to cincy?
I had the problem deliver put in new switch and it did not solve the problem. Turned out MOISTURE IN THE LEFT REAR TAIL LIGHT! CK FOR MOISTURE LEFT TAILLIGHTSorry to hear about the issues that you're having. Let us know if the new brake switch remedies the problem. Those issues definitely sound like something related to a faulty sensor. They give you an ETA on when the repair can be completed?
Moisture left TAILLIGHT causes this.I used the lemon law on mine to no avail Honda won’t budge. The lawyer said it was a mechanical issue he could get it solved but since it was a electronics issue they mourn likely won’t do anything about it. I’m just stuck with the detective car, and Honda expects me to put up with it.
I do wonder if this was a Honda execs car what they would do. I’m sure they would not just accept having a defective car
I hope that moisture in my tail light would not cause my car to break unjustified.Moisture left TAILLIGHT causes this.
Hey guys I had those same issues all of a sudden. Took it to my dealer and something had hit the sensing box, maybe I hit a frog hopping or a bird (I live in the country) but it ended up being a screw was missing and needed to be replaced and also reaimed and recalibrated. It works just fine now.
I was driving on the highway yesterday when the "collision mitigation breaking system" light came on and that disabled the ACC I was using. Nothing particular happened, maybe I was braking at the time. I arrived at destination. Turn the car off and back again right away to see the warning light disappear and everything back to normal. I thought I was ok but it happened few hours later on the way back in the same circumstances.
61 - 80 of 101 Posts
2018 Honda Accord Forum
AccordXClub is the best forum to talk about custom Honda Accords and see popular mods, rims and accessories from the largest Honda Accord community!
Full Forum Listing
Recommended Communities
