2020 Honda Odyssey complaints

Honda Odyssey Idle Stop system failure Vehicle: 2020 Honda Odyssey (Elite) Incident description: While driving, the vehicle's "Idle Stop" system engaged as I came to a complete stop at [e.g., a traffic light, intersection, stop sign]. The engine shut off as designed, but failed to restart automatically when I released the brake pedal. This left my vehicle stalled and disabled in the middle of [e.g., an intersection, a lane of traffic] with no forward power. I was scared as there were lots of cars behind me in the intersection. This has happened over a dozen times. Safety risk: This failure created an immediate and dangerous safety hazard. My vehicle was a risk for being rear-ended by traffic from behind, and my family was stranded in a vulnerable position. The vehicle was unable to move out of harm's way, and I had to put the vehicle in park and manually restart the engine. This is unacceptable for a system designed to work seamlessly and automatically. Additional information: This is not an isolated incident. The auto start-stop failure has occurred multiple times since March 2025. The system failure has put me and my passengers in a position of significant risk multiple times. Failed component: The vehicle's "Auto Idle Stop" (AIS) system, which failed to restart the engine after it was automatically shut off. Resolution: An immediate and permanent recall is necessary to address this dangerous defect. Existing service bulletins have not corrected the problem. I urge the NHTS

On Sunday 9/28/2025 I started up my vehicle and received numerous error messages: Collision Mitigation Braking System (CMBS) Road Departure Mitigation System (RDM) Lane Keeping Assist System (LKAS) Adaptive Cruise Control (ACC) Brake system light I contacted the dealership in which I purchased the vehicle and they did diagnostics. It came back that the front facing camera needs to be replaced. Which is a $2000 repair. After researching online this seems to be a common issue with years 2018-2020 odysseys. This needs to be investigated and a recall issued from Honda USA for remedy as these error messages are concerning when they pop up repeatedly.

The multipurpose camera above the rearview mirror has stopped working. It controls several systems including; adaptive cruise control, automatic brake system, forward collision warning, lane keeping assistance, lane departure warning, automatic high beam control. Every time I start the vehicle I have to clear 6 different malfunction warnings and non of the effected systems will function. There is an increased risk of accidents. I just had a vehicle diagnostic ran at Flow Honda of Charlottesville VA and they quoted me a price of $2,060 to replace the part.

When driving from West Hartford to Westerly on June 3, serious banging started coming from the left rear undercarriage. I stopped by a local Midas shop which identified the problem as a totally broken rear spring which created a dangerous driving situation. At the time, the van had 57K miles on it. The shop strongly advised that we should consider the van as inoperable, and we subsequently had them make repairs. I contacted the dealer, Westbrook Honda in Westbrook CT,. The service manager relayed that he had never heard of a broken spring on a vehicle with these few miles, but the certified warranty coverage expired in August 2024. He recommended I contact Honda Customer Service as this failure appeared to warrant consideration due to its rarity and severity. Honda Customer Service responded by agreeing to cover damage for only half the incurred cost because we didn't bring it to a Honda dealership, despite doing that would have constituted a severe driving safety exposure. Their acknowledgement indicates that this may be evidence of faulty manufacturing of the spring which would appear to warrant NHTSA review and assessment. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

My Honda's multipurpose camera system has failed without warning or apparent cause. Upon starting my vehicle, I now receive multiple alert lights indicating simultaneous failures in critical safety systems including: Adaptive Cruise Control (ACC) Lane Keeping Assist System (LKAS) Collision Mitigation System Road Departure Mitigation System Auto High Beam functionality Occasionally, all the system failure alerts go away. According to my local Honda dealership, this represents an "internal failure" of the multipurpose camera unit (code U300-49). The dealership wants >$2,000 to fix the issue that appears to be a widespread known problem. There was no warning before the complete system shutdown, and all safety features connected to this camera are now non-functional.

I was driving and the message Power Tailgate Problem popped up on dashboard of Honda Odyssey 2020. When I got to my destination I tried to open the trunk and it would not open. I took the car to Honda and they said there's water somewhere that caused problem to the tailgate. I spent over $1,000 to fix it and two weeks after getting the car back, that same message popped up and the trunk would not open again. I did research on this and found out that this is a known issue/defect for all 2018-2021 models. Honda did not take any responsibility and blamed me for not taking the car to a body shop to fix whatever issue that's causing water to infiltrate. I found that there has been class action lawsuits involving Honda tailgate issue for a defective seal on 2018-2021 Honda Odyssey models that allow water to infiltrate, yet Honda will not recall and fix it.

The car had a leak in the trunk that was not our fault it was not due to an accident but rather came that way when we bought it brand new. We were unaware of this leak and now our entire trunk control panel is flooded and the trunk is totally useless as it will not open at all, not even manually. The only way to open it is to crawl to the back and open it from the inside. I asked Honda for a diagnostic and it cost me $200 for them to tell me “yeah we see this issue a lot in the older odyssey” and that it would cost over $1000 to fix. But this was not normal wear and tear or anything caused from lack of care in my part but it was made that way. I am shocked that when I did research on this issue it was happening to ALOT of people and idk why this isn’t part of the recall list.

The contact owns a 2020 Honda Odyssey. The contact stated that while driving at an undisclosed speed, the vehicle inadvertently lost motive power. The contact was able to coast to the shoulder of the roadway, where the vehicle failed to restart. No warning lights were illuminated. The vehicle was towed to the dealer, who diagnosed a failure with the connecting rod bearings, resulting in damages to the engine, causing the engine to seize. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 23V751000 (Engine and Engine Cooling), but the VIN was not included. The manufacturer was not notified of the failure. The failure mileage was 130,000.

For the last few days I turn on my car and get alert lights that I have problems with: the ACC, LKAS, collision mitigation, road departure mitigation systems and auto high beams. From online Honda forums I can see that many people have had these problems and it’s likely due to needing to have the windshield camera replaced. This is a 2020 model but I bought it new in 2021, so it is less than 5 years old and I’ve got 94k miles on it. Honda markets itself on its safety features, but nearly all of my safety features are not operating properly less than 5 years from the date of purchase, it’s a widespread issue, and Honda still has not issued a recall.

Internal failure of the multipurpose camera/millimeter wave radar unit with code U300-49; available for inspection upon request. All safety features linked to multipurpose camera such as adaptive cruise control, lane keep assist, auto high beam, collision mitigation system, and road departure mitigation system are no longer functional. This problem has been confirmed at the local Honda dealership in addition to the numerous forum posts made by like Honda Odyssey owners with this same reoccurring issue. There were no warning symptoms or messages prior to failure.

The camera sensor is malfunctioning. It is affecting the collision sensor and lane assist sensor. Also adaptive cruise control, road mitigation and auto high beams. My vehicle is scheduled for diagnostics with a dealer, but seeing the many, many cases and videos online of the same problem, i am certain of the problem since it has been confirmed by others who have already paid for this costly repair. My warning lamps come on every time I start my vehicle. This is a definite safety issue since the issue is with the safety sensors.

My can intermittently fails to start after the auto idle start system has engaged. I am stopped at a light on a busy road. When the light turns the car tries to start but fails. Some times it is able to start but I get warnings that multiple systems had an issue or at disabled. Other times it fails to start completely and I have to cycle the power off and open my driver door before I can start the car. This has been happening for more than a year and the battery has already been replaced.

On 9/11/25 and 9/12/25. Vehicle would not start. Engine would not turnover and no power to display or lights. After 15 minutes, each occurrence car would start with my diehard jump starter. Battery replaced 3 weeks prior and also checked on 9/11/25 . Battery should 600 cold crank amps and alternator was good. Then on 9/13/25, I was at a red light and proceeded when light turn green and shut off. Was same results afterwards wait 15 minutes and jump started.

The front multipurpose camera has failed “due to internal failure” according to the service tech at local Honda dealer. The camera functions - lane keeping assist, adaptive cruise control, front collision warning, and auto High beam lights, have not functioned for the past month. The windshield was replaced more than a year ago and no other incidents caused the failure, so it seems the camera itself is the issue. My van only has 63,868 miles on it.

I’m have had trouble with the infotainment center since less than 5,000 miles. Supposedly it was fixed during a recall. I still have issues with it. Shortly after the recall was done, I started having all kinds of dash lights come on. Transmission system problems, adaptive cruise control problems, lane assist problem, emergency breaking problems, forward collision problems, and so on. All together, they are about 7 different lights. The rear air/heat no longer work at all. Every so often, I crank it and the radio is black. Won’t work unless I restart the car. Auto headlights no longer work. Side mirrors no longer adjust. Sunroof will no longer open. Interior lights don’t work. Automatic doors and trunk lift do not work. I can’t even lock the van anymore. When I crank it, I have to hold the key fob on the ignition button and press 3 or more times before it cranks. Switch batteries in the key fob and still no different. I paid a lot of money for this van after never having one issue out of my 2014 Odyssey. The 2020 has been nothing but a nightmare since a month after I purchased it. I will never buy or recommend a Honda vehicle to anyone. In fact, I will discourage anyone who tells me they’re thinking about a Honda purchase. I am now stuck with a barely working vehicle because who can afford another car in this economy?

The multipurpose camera in mounted underneath the rearview mirror stopped working. No apparent reason for the malfunction to shut the vehicle off while filling gas and then five different warning lights occurred, including issues with lane keep assist, adaptive, cruise control, automatic, breaking, and several other safety features no explanation for the failure when that vehicle was taken to the dealer and currently being charged $2500 for a replacement of the camera and labor associated with the repair. My belief is that the system is malfunctioning due to overheating, which is a design issue associated with the vehicle and isn’t something that I should be responsible for.

When turning on vehicle the attached picture’s warning lights show on dashboard. Unable to reset them. Vehicles collision sensor not engaged when driving. Road departure will not activate when vehicle drifts of interstate lanes. Cruise control will not work at all. Brake system light will not reset even when brakes and fluids are good. With all these issues, vehicle safety devices don’t provide any safety. These could result in bodily injury and even death.

On [XXX], while driving my wife to the RDU airport, our Odyssey's engine failed to restart after an Auto Idle Stop (AIS) at a busy intersection in Greensboro. Instead of starting, the dashboard displayed a Collision Mitigation System Problem alert, the Drive ("D") indicator light started flashing, and then the dashboard displayed a "Shifting to Park: Apply Brake Pedal" message. We were stranded at a busy stoplight, at the front of a dedicated left-turn lane, unable to drive or shift to park as instructed. The only way to resolve the issue was to hold the Start/Stop button for several seconds to shut the vehicle off. And the vehicles behind us had to swerve around us because our malfunctioning vehicle was blocking the lane. This problem has recurred semi-regularly since [XXX], forcing us to manually disable the Auto Idle Stop feature on every drive to prevent being stranded in traffic. An independent mechanic found no stored diagnostic codes but identified relevant Honda Technical Service Bulletins (23-008 and 23-009) addressing similar AIS failures. A Honda service center misdiagnosed the issue as a faulty battery, but subsequent testing by the independent shop confirmed the battery was in excellent working order. The actual Auto Idle Stop malfunction remains undiagnosed. The vehicle and its Auto Idle Stop system remain available for inspection. This issue appears to be part of the ongoing NHTSA Engineering Analysis EA25-004. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF IN

The contact owns a 2020 Honda Odyssey. The contact stated that on two occasions while driving with the idle stop feature engaged, while the vehicle was idling and stopped, the engine failed to restart as intended when the brake pedal was released. The vehicle was restarted and operated normally. The vehicle was then taken to a dealer however, the failure was not able to be duplicated. The manufacturer was notified of the failure. The failure mileage was approximately 88,000.

Rear view screen turns off due to radio not working due to FAKRA connectors.

Sliding doors don’t close. “Left sliding door problem” flashes on dash often. Have to force doors to close all the way. They try to close and then recoil.

Multiple warnings regarding Adaptive cruise control, lane keep assist, and lane departure warning problems. Honda says it is the front multi-camera. The vehicle works fine intermittently, but doesn’t more often than not. Issue started to occur shortly after a wiring harness recall.

The Multipurpose Camera Unit failed in my 2020 Honda Odyssey. This camera is responsible for enabling multiple advanced driver-assistance systems, including the Collision Mitigation Braking System (CMBS), Lane Keeping Assist System (LKAS), Road Departure Mitigation System (RDM), Adaptive Cruise Control, and Auto High Beams. The component has not been replaced yet and is available for inspection upon request. The failure of the camera disabled multiple critical safety systems while the vehicle was in operation. These systems are designed to prevent lane departures, collisions, and unintentional road exits, especially at higher speeds. With the systems offline, I was at increased risk of collision or lane departure, particularly on highways or in low visibility conditions. This malfunction removed key layers of protection that the vehicle is designed to provide. The issue was confirmed by a Honda dealership on August 8th 2025, which diagnosed the problem as a failed multipurpose camera unit. They acknowledged that this malfunction disables all related safety systems. The vehicle was inspected by a certified Honda dealership technician, but not by police, insurance, or the manufacturer directly at this time. Multiple dashboard warning messages appeared simultaneously one day when starting the vehicle, including: "Collision Mitigation System Problem" "Road Departure Mitigation System Problem" "Lane Keeping Assist Problem" "Adaptive Cruise Control Problem" "Auto High-Beam Problem"

The contact owns a 2020 Honda Odyssey. The contact received notification of NHTSA Campaign Number: 24V064000 (Air Bags). The local dealer was contacted and confirmed that parts were not available. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The contact had not experienced a failure.

My car went completely dead while stopped in traffic on a busy street. My kids were in the car and thankfully I was able to crank it by pressing the start button. This issue has already been “fixed” and the dealership “cannot replicate”

The forward-facing camera and/or radar unit failed one morning while running errands, resulting in 5 separate ADAS system failures. With these safety features not working, our safety and the safety of others is at risk. We took it to our dealer and were told we would have to pay a diagnostic fee of $205, even though they clearly already knew what the problem was- based on the multiple complaints through NHTSA and various other forums and websites from Odyssey and other Honda model owners and across multiple years. The problem was confirmed by the dealer and they quoted us $2025 and we're still not sure if that includes just the camera and/or the radar unit, which is another $600 part. Other dealers have quoted only $1200 to fix the exact same thing, with others charging more than double that. The 5 separate warning messages scroll across our screen repeatedly and are very distracting as you're driving. With multiple electrical issues already in recall status by Honda, this is another one that they should be taking responsibility for and not dumping this defective electrical repair on their customers. Who's to say that we won't be in this exact same predicament 3 or 5 years from now if the part or parts aren't fixed! Definitely expect more from Honda... very disappointed and feel betrayed by the inferior parts they're passing on as quality products.

While driving at approximately 12 mph on slightly snowy roads, my vehicle slipped and made a light impact with the sidewalk curb. Despite the minor nature of the collision, the entire left-side curtain airbag and seat airbag deployed with full force, as if a severe accident had occurred. This deployment was unexpected and excessive given the low-speed impact. I have found multiple online reports of similar incidents involving premature or overly sensitive airbag deployment in Honda vehicles, which raises concerns about a potential safety defect. Concern: I believe this may indicate a flaw in the airbag deployment system or sensor calibration. This poses a safety risk and could result in unnecessary injuries or repair costs

For the past couple of weeks, every time I drive the car, I get a number of error messages regarding problems with the advanced driver assistance features. These include: "Adaptive Cruise Control Problem", "Collision Mitigation System Problem", Lane Keeping Assist Problem", "Road Departure Mitigation System Problem", and "Auto High-Beam Problem". A diagnostic check showed error U3000-49, namely "Control Module Internal Electronic Failure". I took it to a shop, they ran diagnostics and told me I needed to replace the multifunction camera in the windshield. It seems to be a common problem and is very expensive to fix, at more than $2000.

Several months ago my wife was driving when the automatic brake system engaged when a car was turning in front of her. This engagement startled her and she felt the emergency braking was unnecessary considering the speed and distance the car was in front of her. This incident concerned her and made her lose confidence in the safety of the car. Then just recently we began encountering a almost consistent but sometimes intermittent brake System Error along with multiple trouble notices about problems with Road Departure Mitigation System, Lane Keep Assist System, Collision Mitigation Braking System, Adaptive Cruise Control, etc.. when using the car. We received an error code U3000-49 reporting an Internal electronic failure in the multipurpose camera unit. Online searches of this issue seem to be very common and concerning on how many are occurring considering this is a safety system. Our van has approximately 54,000 miles on it.

Engine recently began making noise and the car was taken into Honda. The dealer checked engine components to find the cause and recommended that we remove oil pan to inspect the issue because they assumed it might be engine bearing related. Before we could schedule the service I was driving with my family on the highway when we heard a loud noise and complete loss of power. I was able to move over avoiding other cars to reach the shoulder and come to a stop. The car would not start or go into any gear. Car was towed to shop. What component or system failed or malfunctioned, and is it available for inspection upon request? The car has not been inspected yet. Currently at shop being evaluated. Has the problem been reproduced or confirmed by a dealer or independent service center? Engine was making noise at the dealership when it went for service. There was no concern made by dealer stating car was unsafe to drive. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Was inspected before the car broke down, but currently being evaluated by local shop. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? There was an unknown noise coming from the engine, and dealer stated they needed to remove oil pan to diagnose the noise but stated it could be bearing related. The dealership did not say the car was unsafe or should not be driven. Before we could look

All Honda Sensing technology is not working and brake system indicator is on. ACC, LKAS, Collision mitigation, auto high beam, road departure. I read online that a lot of Honda Odyssey owners are experiencing same problem. It could be the front camera sensor.I have always had electrical problems with car. There crackling sounds when the radio or music is playing on the stereos.

The rear hatch will randomly close after it is opened. The hatch will not stop closing if someone is standing under it. Several times now it has closed while someone is getting something out of the back and you can not make it stop without quickly getting out of the way and pressing the button. Both, myself and my wife have been hit pretty hard on the head by the hatch closing on us. This is a HUGE safety concern as I have children that could easily be harmed by the sheer power of this hatch. I have had the issue inspected by an independent shop and was informed that it would need both new power struts at a cost of over $1,200! The van is only 5 years old with 75,000 miles! There are no warning lights, messages or problems prior to the failure.

The front camera is malfunctioning, affecting all of my safety sensors.

While driving, all at once several messages displayed, all of which are related to forward facing camera. Adaptive Cruise Control Problem, Collision Mitigation System Problem, Road Departure Mitigation System Problem, Auto High Beam disabled along with the BRAKE SYSTEM light turning on When I researched the internet, there are alot a people report this problem with the HONDA forward facing camera witch supports the systems listed this failures. Talking to friends and neighbors they have had the same issues, it is about a $2000 fix to replace and recalibrate the camera link to user forum [XXX] Most of the reported issues including mine are related to heat, the camera is in an enclosure located at the top center of the windshield. We just had heat indexes above 100 degrees. The camera is always hot to the touch. I also had this issue in the past put happened whole under warranty. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The auto idle start/stop feature failed to recognize a bad battery and shut the car off while I was stopped in the left turn lane. The vehicle failed to start and lost all power, including hazard lights and brake lights. I had no way of indicating to other drivers behind me that the vehicle was disabled other than getting out of the vehicle and waving them around me. This happened while I was taking my son to school and could have resulted in us getting in an accident or causing another accident. Honda was not able to identify root cause and replaced the battery. I do not trust this vehicle as reliable or safe any longer.

The multipurpose camera in the vehicle failed, causing multiple warning lights to come on related to the collision warning, blind spot warning, lane keep assist, lane departure warning, adaptive cruise control, and others. The dealership said it needed to be replaced, as it was no longer working and none of these features would work without replacement

The multipurpose camera that sits behind the windshield has completely failed, deactivating many automated safety features. The dealer quoted $2700.00 to replace.

High pressure Fuel pump makes Loud noice. Fuel line vibrates. Check engine light on, Shows error code Low fuel pressue.

The ADAS front windshield camera failed on our 2020 Honda Odyssey. This vehicle is too new to have a failure like this and this is a very common issue that I have seen across all Honda Odysseys of same generation. Honda needs to be held accountable.

I have been getting front end clunking noise since I bought vehicle. Honda is not able to identify and resolve issue after taking to multiple dealers. And after 5 years and 45k miles white paint started flaking in different penal of car

The current 2018-2019 Honda Odyssey recall also is applicable to 2020 models. The Infotainment system frequently is popping or crackling from the speakers or no sound from the audio system, display issues, and shuts off completely.

Lift gate sags. Lift gate sporadically closes without any activation. It does sound warning prior to closing. Lift gate has come down on person causing bruises more than a few times.

The contact owns a 2020 Honda Odyssey equipped with a Cabin Watch camera. The contact stated while driving at an undisclosed speed, the Lane Keeping Assist and the Cabin Watch camera became inoperable. Additionally, the contact stated that even though the Cabin Watch had become inoperable, the Cabin Watch plastic case was constantly burning hot. An independent mechanic diagnosed the vehicle and determined that the Cabin Watch camera needed to be replaced. The vehicle was not repaired. The dealer and the manufacturer were not notified of the failure. The failure mileage was approximately 102,000.

My Honda Odyssey, after a hot summer day showed error codes related to the front camera. The Adaptive cruise control problem (ACC), Auto high-beam (A); Road departure mitigation system, collision/braking mitigation system; lane keeping assist problem (LKAS) now are non-functional. Various internet users complain of the same issues without a conclusive source for the problem. It is either related to battery voltage or front-camera failure (possible due to heat/sun exposure). The 2020 vehicle was purchased used from dealer in 2024 where the battery was stated to have been replaced/new. Further, my vehicle has the infotainment package (TV/DVD) which has also previously drawn down the battery even after the car was shut off (i.e., the electronics and/air conditioning are drawing too much battery and causing low voltages that impact the camera-based sensors). Multiple internet users complain of parasitic battery draw, fuses, poor oem batteries, and faulty behaviors with the camera system.

Honda has been serviced at Honda of Ames #190 since 2022. 2023 - Issues with the engine stalling when it goes into idle mode at a stop. September 2023 – contacted Honda of Ames, IA dealer. They indicated it’s the battery which will need replaced. Took the car to Interstate Battery on 9/26/2023 where it tested at 12.5 volts out of possible 12.6 volts. Then took the car to dealer who insisted it was an issue with the battery. Replaced battery for $391. Problem continued. In 2024 there was a recall re: a known issue with the engine idle functionality requiring a software update. Took the vehicle in for the software update. Complained to the dealer that I unnecessarily spent $390 on new battery when that wasn’t the issue. They refused to refund any money. Problem persisted. On 5/21/2025 the car was brought into dealership for 100k service. I complained again that the auto-idle feature still stalling. Was told that it's not a universal known problem, they don’t have a fix that he’s aware of other than to check the battery. I explained we’ve been through this before and brought up Sept 2023 battery situation. He stated that the quick/handheld battery testers are not reliable; repair shops have “the big testers in the back” that are more reliable – that is what they will test my battery on. I asked if they could turn off the feature permanently and was told no. When car was ready I was told that the battery life tested fine. They did a software upgrade and I will need to drive it an

My Vehicle was at the dealer for service in March of 2025. At that time they performed RECALL 23-008 although the vehicle did not have issues with the idle stop system. Since some time in June, at multiple occasions, the vehicle shifted to Park on its own when restarting from idle stop. Last night, the vehicle fully shut off and lost all electrical power when restarting from idle stop leaving me stranded in the dark at a busy intersection without the ability to turn on my hazard lights. The vehicle repowered after a few minutes. When the system restarted, the info-tainment system activated the anti theft software which happens during full power loss.

The power tailgate control module has been failing. That makes power tailgate problem light come on, than the tailgate beeps and eventually fails. It unlatches itself, and won't latch until the control module has been replaced. My control module has been replaced 3 times, and now a week later after being replaced my tailgate has failed again, the power tailgate problem light is on and tailgate won't open. I was told by Honda dealership that theres a water leak that's causing it. Along with replacing the unit they are trying to seal it but it's still failing.

Took it to certified Honda garage to solve another issue and now there is an issue with the Front facing camera system. - adaptive cruise control - lane keeping assistant - collision mitigation system - road departure mitigation system - auto high beam system

The sliding doesn't close all the way or it will open on it own. I will warning when I am driving about the sliding doors

The radio/screen will go blank when I am driving.