What 70 owners told NHTSA about the 2024 Honda Odyssey

The vehicle has an automatic stop/start feature that is enabled by default, though there is a button readily accessible to deactivate the function easily ea. time the vehicle is operated. The vehicle has just had the starter replaced under warranty @ 25K miles. There have been issues with the vehicle struggling to start for at least six months now - rough, slow starts where the engine is struggling to turn over. If I forget to turn off the auto-start/stop function, the engine will sometimes shut off at a red light - but it won't turn on again when the light turns green and it's time to move. I have had this happen a handful of times in traffic - the engine turns off and will not restart when normal procedures are followed.

NHTSA ODI 11748029

While driving in normal traffic, when I come to a complete stop and keep my foot on the brake, the Auto Idle Stop system activates as designed. However, when I release the brake to continue driving, the engine intermittently fails to restart properly. Instead, it repeatedly attempts to restart, cycling on and off several times before shutting down completely. When this occurs, the vehicle becomes disabled in traffic and does not respond as expected. It can take multiple attempts and a significant amount of time before the engine finally restarts, leaving me stranded in intersections or in moving traffic. This creates a serious safety hazard because surrounding vehicles continue moving while my vehicle is unable to move. This problem has occurred multiple times under normal driving conditions and is not an isolated incident. During one occurrence, the vehicle failed to restart after the Auto Idle Stop system activated, leaving my vehicle disabled in traffic. As a result of this incident, my vehicle was involved in a collision that **damaged the front and back bumper**. Fortunately, no one was seriously injured, but the incident clearly demonstrates the significant safety risk associated with this defect. The vehicle is currently at an authorized Honda dealership for diagnosis and repair. I am submitting this complaint because a vehicle that unexpectedly shuts down and fails to restart after Auto Idle Stop activation presents a serious safety hazard. I am concerned that this defect could lead to additional crashes, property damage, or serious injuries if it is not corrected.

NHTSA ODI 11746717

Had to replace starter at 29,000 miles due to auto stop/start prematurely wearing out component.

NHTSA ODI 11745717

Water leak, which could fire the taillight lamps. Happening to lot of Honda odessey models.

NHTSA ODI 11745290

The car fails to start when coming out of the idle start/stop feature. This has happened at least 3 times to my family. When it occurs it takes ~1min to restart the vehicle and can occur in an intersection.

NHTSA ODI 11744767

Yesterday my 2024 Odyssey auto stop engaged and the car wouldn’t restart in the traffic light. I had to turn the car off and try twice before it would restart.

NHTSA ODI 11744429

The vehicle is experiencing an Auto Idle Stop (AIS) failure to restart from a complete stop. The engine dies, the electrical system resets, and it requires a manual button push or jumpstart to get moving again

NHTSA ODI 11743427

After stopping at a red light behind a few cars in a left turn lane, the Auto Idle Stop (AIS) system turned off the engine. A moment later the light turned green and I let my foot up from the brake pedal. The engine failed to start. The hazard lights turned on automatically. I reapplied pressure to the brake and pressed the Engine Start/Stop button, which had no effect. Electrical systems remained active (i.e. the car did not turn off completely), but the engine also didn't start. I ensured the vehicle was in park and stepped out to verify the fuel door was closed (I had just filled the tank) and check the battery connections. Cars were going around us on the passenger side, and oncoming traffic was very close to me on the driver's side. I was concerned for myself and my passengers. No one was injured, nor was there a collision. After returning to the driver's seat, I tried the Engine Start/Stop button again. This time the car shut down. I waited a minute, then started the car. The engine started successfully. The vehicle is available for inspection. The problem has not been reproduced. We have been disabling AIS since the incident, so it's unlikely to happen again. The problem has not been confirmed by a dealer or service center, nor has it been inspected by anyone yet. I noticed the engine being slightly slower to restart after AIS stopped it in the few weeks leading up to the incident. There were no other symptoms I noticed.

NHTSA ODI 11741942

When driving with or without the cruise the word BRAKE appears and the van taps it breaks automatically even when there is no reason to do so. There is no vehicle in front or anything on the road to be detected. It occasionally happens when there is a vehicle in the oncoming lane, but happens more often when there are no other vehicles close enough to be detected or cause me to need to slow down. It has been happening for some time now, but I did not know how to report it.

NHTSA ODI 11741199

The auto idle stop on this specific vehicle has left me stopped in traffic numerous times. If left on, it frequently will cause the car to turn off when attempting to start from a stop at a intersection, causing a back up or near collision in some instances. It takes 5 - 10 seconds minimum to recognize what has happened, shift to park (if the vehicles allows, which sometimes does not), and restart the car. This being said, I have other Honda's with the same function, and all work normally (as expected), turning off the car when stopped briefly, and starting immediately upon letting off the brake or pushing the gas. -It's only this 2024 Odyssey with this issue- I have spoken with other owners of the same year model and have had the same complaint. The mechanics at the dealership have even said that it is a known issue with this model year, but that Honda has not fixed. This vehicle has been to the delearship at least 3 times to attempt to fix. A new battery was also not a solution. The issue continued after replacement.

NHTSA ODI 11741214

My wife and kids were driving down the highway when the moonroof spontaneously exploded. It made a loud popping noise and glass rained down on my wife and two young kids. No warning signs at all. Luckily everyone is safe but this did cause some traumatic. We do feel uncertain about moonroofs now and are considering a different vehicle.

NHTSA ODI 11741092

Last week, I opened my vehicle door and noticed water standing in the foot well. I didn't think too much of it until I started driving down the street and gallons of water were gushing on my feet in the footwell from behind the steering wheel and fuse box. I parked and waited for it to dry out a few days. I took my vehicle to the dealer and was shocked to hear that this is caused because the sunroof has a drainage system, and when the primary drain clogs, due to pollen or dirt, the secondary drain drains directly into the driver footwell. They advised that this is an issue that disregards vehicle age and sunroof non-use. Because this is a new vehicle, all of my basic maintenance and inspections have been provider by the Honda dealer. I asked why this had not been inspected on my previous service appointments and was told the primary drain for the sunroof can only be inspected by camera. It is only when the primary drain becomes clogged that the water dumps into the driver side footwell. I searched my owner manual and found nothing to indicate or require that the primary sunroof drain should be inspected, cleaned or serviced, at any of the maintenance intervals, and especially not during the first 2 years of ownership. The steering column, fuse box, and driver footwell house all of the necessary electrical and mechanical parts for steering, braking, acceleration, lighting and all other electrical systems controls. Additionally, if this were to happen while driving, the distraction to the driver could be catastrophic. My vehicle has been at the dealer for a week to clear the clog in the primary sunroof drain, remove the seat and carpet to dry, & inspect the electric systems including the power seat. I can make the vehicle available for inspection as needed and the dealer can provide the camera inspection that diagnosed the issue. This happened due to everyday dust and pollen, and there was no advance warning that this drain failure was imminent.

NHTSA ODI 11740750

Automatic start stop completely turns off car when pulling up to a stop sign, light, or yield intersection. Car completely turned off and wouldn’t start on a bridge overpass causing a safety hazard. Took a solid minute for it to restart.

NHTSA ODI 11739505

Since purchasing my 2024 Odyssey EX-L I have experienced on multiple occasions where the idle stop engages but upon releasing the brake the vehicle fails to restart, dash lights up and vehicle is shifted automatically into park while sitting in traffic and vehicles moving all around me as well as honking as I am unable to restart the vehicle immediately. I have to push the start button multiple times before the vehicle will restart. Dealership is unable to replicate issue so I just started turning it off. Now the idle stop/start doesn't engage at all even after driving for hours. Additionally the vehicle is very slow to start especially if I have had to start the vehicle a different times throughout the day. I took the vehicle back to the dealer and they diagnosed it with a bad starter at only 38K miles which is of course out of warranty. Not only is this a safety issue of the vehicle stalling in traffic but Honda is failing to recognize a well known issue with the starter in this particular vehicle, sticking consumers with hefty repair bills for a manufacturing issue.

NHTSA ODI 11737546

On 3 separate occasions, I have been at a stop light where the auto stop kicks in. When I release my foot from brake, it should auto start. Instead, it stalls out. This is a huge safety issue and has caused cars behind me to get angry and honk. If someone wasn't paying attention, this could cause collision easily. The battery seems fine, and even if it wasn't, shouldn't the battery life be considered when the feature is triggered? I will be taking it in to get serviced, but I'm very frustrated.

NHTSA ODI 11736381

For the past year, the vehicle's Auto Idle Stop system has intermittently failed to restart the engine after coming to a complete stop at traffic lights. This creates a dangerous situation where the vehicle is immobilized in active traffic, posing a significant risk of rear-end collisions or other accidents. I have taken the vehicle to an authorized Honda dealership for service; however, they were unable to duplicate the issue and declined to perform further repairs. As the problem remains unresolved, I am reporting this incident to the NHTSA to contribute to the official record of safety concerns regarding this feature in Honda vehicles.

NHTSA ODI 11736192

The car will lose power while sitting at a red light. The dash lights up and you can't do anything. You have to turn it off and back on and hope no one hits you in the meantime. This has happened twice now. I bought it brand new, serviced regularly and has 16k miles.

NHTSA ODI 11734980

My 2024 Honda Odyssey EX-L has a recurring Auto Idle Stop failure. About 1–2 times per week, when stopped at a light and Auto Idle Stop engages, the engine fails to restart properly when I release the brake. The engine sputters or shuts down, the battery warning light comes on, and the vehicle shifts itself into Park. I then have to hold the start button for several seconds to restart the engine. This creates a safety risk because the vehicle becomes disabled in active traffic when the light turns green. The vehicle was previously taken to a Honda dealer for this issue, and the battery was replaced, but the problem continues.

NHTSA ODI 11733652

See attached document for complaint.

NHTSA ODI 11733194

2024 odyssey sport vin [XXX] in the drive through lane at a reataurant activated the auto start stop feature and shut off the van. The van did not restart when trying to move foreward again and had to cycle the starting ignition system via placing van in park and pressing the start button. Taking the van to the hennesey honda dealer in woodstock ga for inspection. Thank you [XXX] [XXX] [XXX] or [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11733274

My car is experiencing the starting issue that is listed as auto start/stop feature. However, since I almost always have the AC on or start/stop disabled because the car will not start when hot after a few stops and was scared it would do it in traffic. So far I can get it started again but need to completely turn car off and try again, sometimes more than once. Had been going on for a year and the dealer has replaced battery then the next services said nothing wrong. Now the car is out of warranty and the starting issues getting worse and have finally found online that others are experiencing similar issues. I have forgotten to turn off start/stop a couple times and been stranded in traffic as well when car auto stopped at red light and did not restart causing me to be stuck until i could get it restarted.

NHTSA ODI 11730007

The contact owns a 2024 Honda Odyssey. The contact stated that while driving at an undisclosed speed, and while stopped at a red traffic light, the Automatic START/STOP system failed, causing the vehicle to unexpectedly shut off. The vehicle was restarted and drove normally. On another occasion, while stopped in a drive-thru, the vehicle shut off unexpectedly. The emissions system, adaptive cruise control, and tire monitoring system warning lights were illuminated. The vehicle was taken to the dealer, where it was diagnosed with battery failure. The battery was replaced; however, the failure persisted. The manufacturer was notified of the failure. The approximate failure mileage was 22,000.

NHTSA ODI 11724091

The idle stop on the van will stall the vehicle. This has happened 3 separate times where the vehicle stops, then stalls when the engine tries to turn back on. This can be very dangerous, especially when trying to turn from an intersection and the vehicle stalls.

NHTSA ODI 11723214

"The vehicle is experiencing an intermittent, loud popping/crackling noise coming from the speakers and infotainment system. This is a known symptom of a failure in the MOST (Media Oriented Systems Transport) bus network, specifically related to defective FAKRA connectors and coaxial cabling. This issue was previously the subject of NHTSA Recall #23V-431 for 2018–2023 models, but the defect persists in this 2024 model." Safety Risk: "When the MOST bus network loses connection for more than 20 seconds, the infotainment screen freezes or goes black, causing a total failure of the rearview (backup) camera image. This failure occurs unpredictably while the vehicle is in reverse, significantly increasing the risk of a back-over accident or collision. Additionally, the loud, sudden popping noises are a severe driver distraction." Dealer/Manufacturer Response: "The Honda dealership confirmed the issue is consistent with the known MOST bus failure (TSB 23-047). However, because the vehicle has 49,000 miles, both the dealership and Honda Corporate (Case # [Insert your number if you have one]) have denied a goodwill repair, despite this being a documented safety defect that has been the subject of prior federal recalls

NHTSA ODI 11722525

SEVERAL TIMES, I HAVE BEEN DRIVING, AND THE AUTO STOP SHUTS THE ENGINE DOWN, THEN IT WILL NOT RESTART. THIS HAS HAPPENED ON A VERY BUSY STATE ROUTE IN THE MIDDLE OF AN INTERSECTION, WHILE I HAVE MY YOUNG CHILDREN IN THE VEHICLE. THIS IS VERY CONCERNING AND A MOJOR SAFETY ISSUE FOR US.

NHTSA ODI 11722539