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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
 

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Ron - I've had the problem with the collision system once and upon restarting it was fine and has been ever since. Hope they find the solution.
 

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Sorry 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?
 

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This happened to me this weekend, haven't had a chance to see the dealer yet about it. Went away after restarting the car.

Quick Google returns two items of possible interest, neither of which were applicable to me:
1) Honda Sensing failing on very sunny days essentially implies that sunny conditions may overload the camera and overload the system into an overload state. (I was driving on a cloudy day)
2) Issues with Honda Sensing. Full system shutdown essentially stating that a radar detector placed too close to the sensing camera can overload the system (I don't have a radar detector).

My situation: overcast day, draveling away from the sun on a highway with light traffic, cruise set at 60, following a car doing 57ish, I got a warning tone and message for CMBS problem. Unable to re-engage cruise until I stopped the car for gas and restarted. First such issue in approx 1500 miles since buying the car new.
 

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Discussion Starter #5
New brake/cruise switch installed

The new brake switch (P/N 36750-TVA-A01 switch, stop & cruise) was installed yesterday. I have not yet had an opportunity to seriously check it out. I will post when I have given it a substantial try.

Ron
 

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Since it's happening to more than one person, it's best for everyone to log the problem with their dealership and maybe a recall may be issued in the future if it's widespread enough.
 

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Discussion Starter #7
Success!

I drove 400 miles this weekend, probably at least 250 miles on adaptive cruise control, and had no CMBS or other malfunctions whatsoever. I went the first 100 miles without touching either the brake pedal or accelerator. Hopefully, the problem may be finally solved.

Ron
 

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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
I am having the same problem. Contacted Honda USA after the second time having it at the dealer. First they said it was "BUG JUICE" the next time it is the system is getting confused. So I contacted Honda. The service manager then called me, had me bring the car back in. Still not fixed. Honda USA told me they are sorry but they do not have a fix for it yet and they do not know when they will have a fix. So Bought this car for the safety aspects. With this issue I am not happy at all. I love the Accord but all I want is this fixed.
 

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I am having the same problem. Contacted Honda USA after the second time having it at the dealer. First they said it was "BUG JUICE" the next time it is the system is getting confused. So I contacted Honda. The service manager then called me, had me bring the car back in. Still not fixed. Honda USA told me they are sorry but they do not have a fix for it yet and they do not know when they will have a fix. So Bought this car for the safety aspects. With this issue I am not happy at all. I love the Accord but all I want is this fixed.
Looks like we have a lemon law case here https://www.dmv.org/ca-california/automotive-law/lemon-law.php

Hope you're in California...or that something similar exists in your state
 

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@remcclellan, since it's been about 5 weeks since your last update, have you seen any more CMBS error messages appear since your brake switch was replaced?

Several other owners including myself have had the "Collision Mitigation Braking System Problem. See Your Dealer." error message appear multiple times. There's a discussion about it on another Accord forum.
 

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I've got a red EXT 2.0T. I've had this problem crop up as well, at least three times thus far. I drive 33 miles each way to work, 95% freeway. Adaptive cruise works fine, once I was able to tighten up the following distance. But the Collision Mitigation error occurs without much rhyme or reason. No weird traffic or anything. I've not yet called the dealer cuz I've been too busy to take the car in. But I plan to call them. I've rolled up over 5,000 miles since 4/30. Love the car and the sound system. This is the only glitch so far. Not terrible and it does reset once I shut off the car and re-start. But that's really not an option while on the freeway.
 

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Even though this has not been a safety issue, once those who experience this problem realize it can be temporarily corrected by restarting the vehicle, it can become a major safety issue if owners start trying to restart their vehicles by shifting to neutral and starting and restarting their vehicles while driving 80 MPH down the highway.

A strongly encourage anyone who experiences this issue to file a complaint with the NHTSA.

https://www-odi.nhtsa.dot.gov/VehicleComplaint/

This helps everyone including the manufacturer.
 

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I'm having the same issue. I've had the 1.5 Touring since November 2017. The Adaptive Cruise Control is easily my favorite feature of the car, accept for the multiple times a week when it drops off because of a Collision Mitigation Braking System issue. I have had it in to the dealer twice to no avail. They have tried to replicate the problem (drove for 15 miles and found nothing). They have noted the message in the system indicating the failure, but like all of the others, it resets once the car is restarted. If anyone comes up with any useful information, I would greatly appreciate it!
 

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Hello all,

Unfortunately, with only 2000 miles on my sport 2.0, I'm joining the club of people who had that warning light.

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.

It was Sunday so I took the car to the dealer today. They plugged the computer to the car and all they could find was a DTC U0401-92 "temporary stop of integrated driver support system (Rejected control request by PGM-FI System) which apparently has no fix (for now)

They told me that if it happens again, I should drive to the dealer while the warning light is still on (which I did yesterday but service was closed)

Drove the car today, used ACC a little in the city with no issue so far.

I hope that I won't have the problem again. I love the car but if I can not rely on it, I'll lemon the crap out of it ;)
 

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Hello to you all

290 miles on my new 2.0T EX-L Accord since I traded my 2016 Sport in last week and I feel as if it already tried to put me in the wall....!

I was commuting on the freeway, light drizzle w' the cruise set @ 70mph

at one very slight 5 degree left bend of road the "Lane Departure mitigation warning" started flashing and tagging my steering, My hands were always on the wheel and I never departed my lane.


I fought The car from trying to steer me BACK into the right occupied lane for 1-2 seconds which was enough to cause the anemic 17'' Inch Michelin Energy tires to loose traction.

Thankfully the left side was free of traffic. I was able to steer back to the left and regain control, first thing I did was to disable the lane departure mitigation control. ((Depicted as Round Green Circle on the left TFT Screen)).


Unbelievable, Beware of Automation....And RUBBISH Tires.

My 2016 Sport was Equipped w' 19' Continentals, by far the Best tires, No wonder it is exactly what Honda is using on the Civic Type-R.

I Already Purchased the 19'' Touring wheels and I am fitting them with Continental procontact tires.
 

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14,000 miles and twice already within the month I got the errors for the CMBS fails and that I should see the dealer.. Stopping and restarting reset the error. First time it happened when using my ACC during stop and go traffic and the other was at night driving through my neighborhood at low speed. Taking it to the dealership tomorrow..Based on the previous comments I feel like this will not likely be resolved.
 

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I get this periodically with bad weather. Snow, ice, sever rain, leaves blowing - just about anything will cause it to throw a fit. It’s a shame because bad weather is when you could use even more help as driving becomes more difficult/dangerous. Why it can’t self reset without a restart I don’t know.
 

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i got the error today in some ok weather (03/20/2019) this is the 2 time it failed for me.
should i take it to Dealership for repair? i only have 7500 miles on it and i am getting this.
 
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