I purchased a used 2021 Passport the end of May 2025. While driving, the 'collision mitigation braking system' or CMBS would activate the braking system and would intermittently just brake, causing panic for not only myself, but I'm sure drivers behind me for suddenly braking with no imminent threat in from of me. This happened multiple times without receiving any warning or notifications, just suddenly. It would happen without warning, or sometimes nearing a bridge or a cover plate on the road, which almost caused accidents multiple times to get rear ended. I have driven for decades and never felt anxiety until I drove this vehicle for a few months. I felt scared driving this vehicle, feeling uncertain when it would suddenly just brake. Eventually after a few months of driving, I got a reading that said CMBS problem on the screen. I scheduled an appointment with the dealer. The dealer suggested a near $3000 replacement for a camera (on a 2021 vehicle). At the appointment, I ultimately returned this vehicle to the dealer where I bought it and unfortunately lost out on thousands of dollars after having the vehicle about 6 months. I have always liked Honda, and have had 2 prior Hondas, but with this vehicle purchase, I felt the most unsafe I have ever felt in a vehicle, and moving forward will not feel comfortable purchasing Honda.
2021 Honda Passport driver assistance complaints
Page 2 of 3: complaints 11 to 40 of 54, newest first, as owners wrote them.
One day the lights just started flashing. Took to dealer and was told that someone must have backed into me and would be about $2500 to replace the camera (which is behind the windshield). Occasionally it will function but clearly seems to be a malfunction. In research online there appear to be many others that have experienced the same issue - can’t just be a coincidence. Shouldn’t happen on a reliable four/five year old car
Was driving 47 mph at 12:35 EST on a clear sunny day and car braked automatically. No car in front of me.
Car slammed on brakes while on interstate, the system likes to say brake, brake, brake, when there is nothing to brake for but a few days ago it actually took action and slammed on brakes on the freeway.
CMBS (Collision Mitigation Braking System) Problem
When I turn on the car, the "BRAKE SYSTEM" warning light appears, along with several alerts that disable all Honda safety features, including: 1. Road Departure Mitigation System Problem 2. Auto High-Beam Problem 3. Adaptive Cruise Control Problem 4. Lane Keeping Assist Problem 5. Collision Mitigation System Problem After taking the vehicle to a Honda dealership, the diagnosis was a failure of the Multipurpose Camera Unit and/or the Millimeter Wave Radar. Unfortunately, this is a common issue affecting several Honda models, including the Clarity, Fit, Pilot, Passport, and CR-V. Due to high demand and limited supply, the camera unit is currently sold out nationwide with no estimated restock date. Repairing this issue is expected to cost approximately $2,600, with no set timeline for when the parts will become available.
Owned the 2021 Honda Passport for 4 years and have had multiple issues over that time. 1st. Electrical issues. Randomly while driving the center/head unit will continuously restart on a loop until vehicle is turned off and turned back on. 2nd. The speakers make crackling noises randomly while driving. Even when the audio/speakers are turned off the crackling continues. (Very loud and annoying) 3rd. The Passport sometimes shuts off completely when stopped at red lights and has difficultly turning back on / restarting. This showed an error that there was a battery issue, which the battery had just been replaced a month or two earlier. It said something about being in accessory mode. 4th. The sensor that tracks oncoming traffic goes off sporadically. There are times on single lane roads that the car forces the breaks on because it senses cars on the other side. 5th. There has been issues while accelerating that feel like the car is having trouble shifting. It continues to rev but not go, when letting off the gas it almost feels like its doing an engine break to get back down to a certain rpm or something. Had the whole car bouncing, had to pull over and turn off the car to get it to start working properly. *** All of that said, this car has been and continues to feel unsafe to drive for multiple reasons listed above. I'd be more than happy to go into more detail for them if needed. ***
The vehicle infotainment system froze. Several minutes later after driving, I pressed the brakes but they did not function. The vehicle would not stop and crashed into the vehicle in front of me. Emergency braking did not engage or otherwise show signs of activation. After turning off the car and dealing with the accident, I restarted the vehicle and the brakes and infotainment system operated normally.
My automati braking has repeatedly malfunctioned and deployed emergency braking when no other vehicle is in the front of mine
The contact owns a 2021 Honda Passport. The contact stated while driving at 22 MPH, "The Collision Mitigation Braking System" warning message illuminated. The contact stated the vehicle applied the emergency brakes independently. The vehicle was not diagnosed or repaired. A dealer was not contacted. The manufacturer was notified of the failure. The approximate failure mileage was 25,950.
The automatic emergency brake system will randomly activate despite there being nothing in the way, no car in front, and no obstruction. It causes the car to slam on the brakes for no reason which I’m afraid will cause someone to hit me from behind.
- Automatic braking system flashes warnings for no reason, with no cars around me - Parking break hasn’t taken a handful of times - No collision warning when parking brake didn’t take, front end is now damaged ** I have dash cam proof I hit the parking brake before I collided with the vehicle in front of me in the school line. Husband glued the grill pieces together to keep them from overlapping.
Driving on [XXX] in New York State and the car started to break and no objects or cars in front of us. Dash-broad light came on and it said Break. Traveling doing 70 MPH and car went to 50 or so in seconds. This goes on about once a week in different areas. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
On my way to work I was on the highway and five warning lights came on out of no where. All five warnings were the safety assist systems had problems. I drove to the Honda dealership and found out it was my microchip for my honda,the main microchip for all of the safety and system controls were dead/bad and that it would need to be replace. I was told by the service manager that without the micro chip the vehicle would no longer be drivable as it controls power steering system, brakes system, lane departures, etc. If I would have ignored those warning lights, all of those systems all systems would have failed putting my life at risk and others in their vehicles as well . My vehicle was bought with 3 miles on the speedometer and was only 2 years old at the time of this occurrence.
I have encountered two types of brake issues: 1) my vehicle seems to flash BRAKE occasionally when oncoming vehicles pass by for no reason - they are not entering my lane or doing anything that should cause the message to flash. The vehicle type does not seem to matter - they have been old and new models, and have been both cars and trucks. My vehicle has only visually warned, but does not engage brakes, so no further safety issue is involved. It has done it frequently on some days and then none for awhile. We have tried to make note of vehicle type and model for consistency, but have not found any. 2) If my vehicle has its cruise control on (which is often) and a vehicle in front of me moves into a left-turn lane to turn - often with plenty of notice - my vehicle will engage it’s brakes and slow down even though there is no danger of hitting the other vehicle. So long as I take it out of cruise control, it will continue on driving. I suspect that if cruise control is not disengaged, it could fully brake and cause a bigger issue of an injury or accident.
I’ve had several incidents where my vehicle has forced me to a screeching hault when not needed. Most recently it did, and I was almost rear ended by a large UHaul truck while my baby was in the backseat. This is extremely dangerous. This anti-collision system activates while on turns and when nothing else is happening around the vehicle. This is a safety feature that makes the vehicle more unsafe.
I have had multiple instances where the car appears to engage the brakes to prevent a collision, although I don't see any obstruction. It also makes the alarm sound indicating that I should brake as well. This occurs only on highways at highway speeds. It lasts for a few seconds and the car slows down significantly.
Since purchasing the vehicle in December 2023 with ~36,000 miles there have been two instances where the automatic brake warning has activated. Both events occurred while entering a corner between 30-50 mph with no other vehicle in the area or obstructions to be noted. The passport briefly activated the automatic brake warning, with the flashing indicator occuring on the main dash display for roughly 3-5 seconds. Following this brief period of indication the vehicle returned to it's normal operation. No accidents or injuries were sustain from these spurious events.
The forward colision warning comes on for no reason and brakes are getting applied for no reason. Very dangerous and can cause a rear end crash.
The automatic emergency braking system will turn on when there is no danger. It happens often. The system is fooled easily. Yes it’s available for inspection. How was your safety or the safety of others put at risk? With normal driving conditions this is not a huge problem but if this were to happen with slick roads. I could see this causing an accident. Has the problem been reproduced or confirmed by a dealer or independent service center? No - I’m not sure how this would be done. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? No Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No
The Forward Collition Mitigation System is constantly braking on its own for no apparent reason. It happens a lot when going around a slight right turn and it interprets cars coming the opposite direction in the other lane as a trigger to start braking. It is a very dangerous situation each time, so I turn off that feature every time I start driving now to avoid it.
On Sunday April 14 while driving on the LIE middle lane a person driving at a high speed went from right side across to left lane in front of me when all of a sudden the brakes activated itself and my car nearly came to a stop nearly causing a car behind me to rear end me. This happened several times before while driving approaching vehicles in front scaring my family and I. Now my CMBS lights are permanently on on the dash. This system is nerve racking and will cause a severe fatal crash. Many people on several platforms are complaining about the same or similar issues. And understand an investigation has begun. Something needs to be done to resolve this issue. I have owned my 2021 Honda passport since November of 2023. With 19k miles.
The emergency collision system constantly actives when there is no need for it to activate. It’s more of a safety hazard. I have just under 40 years of driving experience, former mechanic, and police officer for over 20 years. My professional opinion is, Honda needs to correct this problem. Thanks.
The passport flashes BRAKE and steering wheel shakes for no reason. I’ll be driving down the road nothing near and it does this. A few times it’s actually applied the brakes. Thank goodness no one was behind me as it potentially could have caused an accident. This occurs daily. Especially if I am driving on a 2 lane road
No warning messages on dashboard. The drivers side mirror goes off like there's something there but there's nothing. Same with the braking display light comes on when I'm no where near anything, yet I've had cars pull out in front of me thankful no crash has happened because it doesn't go off then. I plan to take it into the dealership soon. I can't give an estimate of how long exactly it's been doing this. Especially side mirror warning. That's been going on. The braking thing has probably been a month now
The sensors simply don’t work. CMBS system constantly raises warnings, often alarming me as a driver, almost creating accidents. On one occasion, coming into a turning lane of intersection with green arrow and cars moving forward into left turn, CMBS actually applied the brakes for about 1 second, alarming me and causing the driver behind me to react as well. There’s no permanent disabling of this feature, which is a mistake by mfg, and we often forget to turn off starting each drive. Blind spot is often throwing false alarms. Lane detection too, but we permanently turn off lane detection.
Under many normal driving conditions, the front collision brake system activates. This has almost caused a collision as it shakes the wheel and applies the brakes.
When driving my vehicle the emergency braking system alerts and initiates the brakes at inappropriate time. While driving on a straight road with a curve ahead if there is a car coming the opposite direction around the curve the braking system will engage. I am not at the point to go into the curve yet so my steering wheel is still straight. If I have starting to turn it will not engage. This happens daily as it is a road I take to work. This has been happening since I purchased the vehicle in January 2023
Our 2021 Honda passport EX-L sometimes hits the brakes on its own. It happens every now and then, like when I'm exiting a freeway, or sometimes even when going with the flow of traffic. I've seen this issue talked about in the [XXX] , but today I saw an official article citing the federal safety agency concerns, so I'm writing to say that I too have experienced this potential dangerous issue while on road. My vehicle randomly brake checks on its own when it falsely detects the situation in front of me, which could result in a rear end collision. I'd like to see this issue resolved, so please feel free to contact me if you need any more information. Even back in 2022, I was experiencing this issue. This has happened occasionally. The last time was about a few weeks ago on the freeway. Please see the forum screenshot for my reference-- I'm [XXX] in that thread. Here's the article I read today: [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
When the passport is in cruise control I have been driving up a very steep mountain and have had the car slam on brakes with no indication to the cars behind me or me intially causing everyone to come to a halt going up a mountain with a 9% incline. I realize you can adjust the distance but it still gives no warning and it is not as if you are tailo the car in front. I turn in my subdivision daily and if I let off the gas which I have to I the neighborhood and not have to break at five or ten mph something underneath feels as if it is catching like a bike break too close it scrubs. The final thing. I have started the car remotely many times. I have done it twice in parking lots and it has jumped forward . Had someone been in from of the car standing it jumped hard enough to hit someone. Or it the car facing mine had been closer it would have hit that car as well. Thank you
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