2025 Honda Odyssey engine problems

ENGINE

After stopping at a red light the engine auto stopped and would not restart after releasing the brake. After 20 minutes of trying to turn the vehicle on/off it finally restarted. Serious safety concern since it was a busy road and the vehicle couldn’t be put into neutral to push it out of the lane. The vehicle is under 20,000 miles and in the warranty period. I haven’t taken it to the dealership to determine the issue however they did say there are no service bulletins for this issue. This is the first time it has happened but I have since turned off the auto start/stop before every drive in fear that it will cause a crash in the future.

NHTSA complaint #11758807 — an unverified report by a vehicle owner.

ENGINE

Starter issue both during idle start/stop mode and going from off to on. Owned for about 20mos and happened first maybe 6mos ago and has happened a dozen times since then. So dangerous! We have had idle start freeze at a green light and are worried we’ll get hit. Sister in law has the same problem with hers. This needs to be fixed immediately!

NHTSA complaint #11757592 — an unverified report by a vehicle owner.

ENGINE

When the engine is hot, the car hesitates to start for a couple seconds. Occurs on really hot days especially after stopping and starting the engine such as after getting gas or on idle stop at a redlight. The motor starter has been replaced by Honda to a new one but the issue can re-occur as the part being replaced is the same with the same build and will likely fail again in hot conditions.

NHTSA complaint #11757634 — an unverified report by a vehicle owner.

ENGINE AND ENGINE COOLING

The contact owns a 2025 Honda Odyssey. The contact stated that while sitting at a traffic light, with the Auto START/STOP feature engaged, the vehicle completely shut off. The contact was able to restart the vehicle after several attempts. The failure was a recurring failure. The battery was replaced; however, the failure persisted. The contact associated the failure with NHTSA Action Number: EA25004 (Engine and Engine Cooling). The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 30,000.

NHTSA complaint #11757715 — an unverified report by a vehicle owner.

ENGINE

While at a stop light on a major road, the vehicles auto start stop engaged. Upon the light turning green, I released the brake and vehicle failed to restart. The vehicle put itself into park and flashed a warning message "problem detected....." . I pressed the start button, and at first the vehicle failed to start, making a clicking sound, consistent with a dead battery or starter. I had to press the start button 4 times before the vehicle restarted and I could proceed. I was extremely concerned as I had my wife and three kids in the car, unable to move forward on a major roadway. I have an appointment at the dealer for this Friday.

NHTSA complaint #11757358 — an unverified report by a vehicle owner.

ENGINE

I was at the red light and the car wouldn't come out of idle. The battery light came on and the i tried to turn the car off and it just keeps cycling. I had to open the door for the car to cut off and then restart the car. This is the 3rd time this has happened and almost resulted in me and my children being hit.

NHTSA complaint #11757371 — an unverified report by a vehicle owner.

ENGINE

While stopped at a red light or intersection, the vehicle's Auto Idle Stop feature engages and shuts off the engine as designed. However, on multiple occasions, the engine has failed to automatically restart when the brake pedal is released. The vehicle remains stalled and unresponsive in the middle of the intersection or traffic lane, creating a safety risk to myself and other drivers, particularly at busy intersections. In some instances, the vehicle needed to be fully powered off and restarted before it would move again. This is a known and widely reported defect affecting Honda and Acura vehicles with the Auto Idle Stop system, currently under NHTSA Engineering Analysis EA25004. The problem has occurred repeatedly and unpredictably, with no consistent warning beforehand. The vehicle and its Auto Idle Stop system are available for inspection upon request. The problem has not yet been confirmed by a dealer, though I intend to bring it in for diagnosis. There were no warning lamps or messages before the failures occurred; the only symptom was the engine simply not restarting after an automatic idle stop.

NHTSA complaint #11757543 — an unverified report by a vehicle owner.

ENGINE

My van has an auto-stop feature that shuts the engine off at stop lights. This feature will now occasionally shut the car off, but then fail to restart it. We have stalled out at intersections with the van not restarting for up to a full minute. This is incredibly dangerous and needs to be addressed immediately

NHTSA complaint #11756849 — an unverified report by a vehicle owner.

ENGINE

Auto idle/stop system engages while sitting at a traffic signal as designed. When attempting to proceed, the engine fails to restart and all electrical components completely shut off for several minutes. All components stop working (information screen, gauges, hazard lights, and door locks are non-functional) and the vehicle is unable to turn on for several minutes. This creates an unreasonable safety risk for the occupants of the vehicle and for surrounding motorists when this failure occurs in active traffic lanes as the vehicle when it is reasonably expected for the vehicle to resume propulsion and with no ability to turn on hazard lights to warn approaching motorists of the vehicle's disabled status. The failure of the door locks during the event traps the occupants inside the vehicle, which we are in Florida so, hot summer days the internal temperatures can reach deadly levels within minutes with no way to escape. The vehicle was initially inspected by a manufacturer authorized dealer service department on 7/8/25 and the issue was dismissed. The vehicle was again inspected on 7/30/25 by the same service department and confirmed. A starter motor assembly and relays were replaced by the dealership and the vehicle returned to use on 8/4/25. Again, on 8/5/26 the vehicle exhibited the same safety defect while in an active traffic lane. The vehicle was returned to the same service department on 8/6/26 where it remains as the date of this report with no communication on resolution for the problem from the manufacturer. There were no warning lights or messages prior to the failure.

NHTSA complaint #11756215 — an unverified report by a vehicle owner.

ENGINE

Numerous times since purchasing my van it has failed to start. At first it was just random at a stop light when I would forget to turn off the idle stop. Leaving me stuck at stop lights with a vehicle that won't turn on without multiple attempts. More recently it struggles to start after stopping to run errands or get gas or in drive thru lines. Having to depress the break pedal to the floor (much further than needed to even stop the car) and press and hold the on/off button while it chugs and attempts to start. The issue was able to be recreated by the dealer and they indicate that it is a starter issue but the part is on back order. Upon further discussion it appears that this isn't an unknown issue and that there is a current investigation into this issue. However, the service manager indicated to me that this isn't common and this was a "one off" incident.

NHTSA complaint #11756239 — an unverified report by a vehicle owner.

ENGINE

2025 Honda Odyssey with 21.5k miles on it. Pulled up to a stoplight after a 3 hour drive. Auto stop turned the van off. When the light turned green the van failed to restart. Put the vehicle in park, turned it off, waited a few seconds and attempted to re-start it. Van restarted but very sluggish, like the battery was dead. Pulled in and parked. Van started normal the rest of the day. Took it to the dealer 2 days later. They noted the battery was a little low but no codes and no explanation for why it failed to restart. They checked alternator and starter and claim they are both good.

NHTSA complaint #11756065 — an unverified report by a vehicle owner.

ENGINE

UNKNOWN, while driving when I was waiting at the signal (waiting for green signal to move) my vehicle automatically shifting from direct to park gear.Once shift to park then no other gears/buttons do not work, only I can turn off the vehicle and restart then all gears/buttons work to move on. This safety issue happened three times (6/25/2026, 7/13/2026 & 8/10/2026) on the road. I took my vehicle on 7/14/2026 to the dealer and they said they didn't find any issue after keeping the vehicle for six days with them. If this issue happens while a vehicle is moving on the road it is going to be a big disaster. After the 08second incident I reported to the Honda manufacturer too.

NHTSA complaint #11756101 — an unverified report by a vehicle owner.

ENGINE

RE investigation EA25004. We have had two instances of the van failing to restart after it shut off automatically at a red light. This caused a dangerous traffic situation where the van would not start up while traffic was approaching. The battery is in good condition and the van has just over 10,000 miles on it.

NHTSA complaint #11755528 — an unverified report by a vehicle owner.

ENGINE

Vehicles turns off when the brake is pressed and does not turn back on. The van has to be put into park and the start button has to be hit 2-3 times before it will restart. This has happened 3 distinctive times where it was difficult to restart. We try to disable the start/stop system each time we drive. It has left us stranded at traffic lights for up to 20 seconds trying to restart the van, impeding traffic at high speed interchanges. The van does eventually restart but each time it feels like it’s getting more difficult. This problem first appeared about 1 year after purchasing the van with about 23k miles on it and now has 26k miles. There are warnings that display because the vehicle is still in drive when it shuts off and it needs to be placed back into park to restart it. It occurs the most during a long drive on the highway. It can be very jerky when it restarts, perhaps slamming into gear. It is available for inspection and I plan to go to the Honda dealership soon for a scheduled oil change. I have not been there since the 18k mile oil change.

NHTSA complaint #11755565 — an unverified report by a vehicle owner.

ENGINE

When the idle system kicks in, for example, if the vehicle has stopped at a red light, randomly the vehicle will die. Then it will have to be restarted. It has a faulty starter and there’s an issue with the idle system when the vehicle dies at a red light, it creates a safety issue because they are vehicle vehicles coming up behind me and my vehicle is dead and will not move until I turned the vehicle completely off and restart it. It does not happen all the time, but it has happened here and there since I got the vehicle new and now it happens more frequently. They say it will require a new starter motor assembly to repair.

NHTSA complaint #11754940 — an unverified report by a vehicle owner.

ENGINE

My brand new vehicle continues to leave me stranded at stop lights because of the auto start stop system. Even though I have already taken it up to the dealership before and had it repaired. (There is a class action started over this)

NHTSA complaint #11754353 — an unverified report by a vehicle owner.

ENGINE AND ENGINE COOLING

The contact owns a 2025 Honda Odyssey. The contact stated that the vehicle failed to restart after being turned off. The Auto START/STOP system failed to operate as needed. The contact stated that the battery was in good working order, but the starter was not operating as designed. The contact stated that the vehicle stalled while at a traffic light. The vehicle was restarted after another attempt with several unknown warning lights illuminated. The contact stated that the failure was associated with NHTSA Action Number: EA25004 (Engine and Engine Cooling). The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 16,000.

NHTSA complaint #11754425 — an unverified report by a vehicle owner.

ENGINE

The Auto idle stop feature fails to restart the car during a stop. This happens intermittently but requires one to fully put the car in park and restart the car. This issue has caused concerns as I was at a stop light with a long line and did not know how to recover until I tried to full shutdown, set the car to park, and restart.

NHTSA complaint #11754441 — an unverified report by a vehicle owner.

ENGINE

Incident Description: The vehicle entered an Auto Idle Stop event at a traffic light and stalled completely instead of restarting when the brake pedal was released. The red battery warning light illuminated, and the vehicle had to be shifted into Park and the ignition key cycled multiple times to eventually achieve a slow, sluggish crank and engine restart in active traffic. Another vehicle was almost going to hit me from behind since red light turned to green when this happened, and that driver from far behind was thinking that my vehicle will start moving and did not slow down. That driver started honking and yelling. It was scary since I had 3 small kids in my vehicle. Dealership Diagnostics: I dropped off the vehicle at a local Honda Dealership to get this checked. From the invoice/service document, I see this note: Cause: Took several attempts but was able to duplicate concern of when vehicle goes into auto start stop it will not always restart, will have to cycle key. Noticed when it did restart it is slow to crank. Battery tested good, and had good reserve voltage. Used tech line as a resource and found this issue is caused by starter not having enough voltage to properly engage auto stop start. rec replacing starter. Correction: Replaced starter.

NHTSA complaint #11754469 — an unverified report by a vehicle owner.

ENGINE AND ENGINE COOLING

The contact owns a 2025 Honda Odyssey. The contact stated that while driving from a complete stop, the Auto START/STOP system failed to restart the vehicle while depressing the accelerator pedal. The vehicle was manually restarted. No warning light was illuminated. The contact stated that the failure was intermittent. The vehicle was taken to the dealer, where the battery was fully charged and tested, and the contact was informed that the battery was in good working condition; however, the contact requested that the battery be replaced. The contact expressed concerns that the battery replacement might fail to resolve the issue. The contact related the failure to NHTSA Action Number: EA25004 (Engine and Engine Cooling). The manufacturer was notified of the failure, but no assistance was provided. The vehicle was not yet repaired. The failure mileage was approximately 12,000.

NHTSA complaint #11754545 — an unverified report by a vehicle owner.

ENGINE

This is for 2025 Honda Odyssey. The component/system that appears to have failed or malfunctioned is the automatic engine stop-start system and/or related vehicle power/drive-control system. The vehicle is available for inspection upon request. When stopped at a traffic light or in traffic, the automatic stop-start feature does not restart or re-engage properly, and on several occasions the vehicle became completely disabled and would not move when the accelerator pedal was pressed. During these events, there was flickering/interruption of power, and I had to turn on the hazard lights, shift to Park, turn off the air conditioning, and attempt to power or restart the vehicle before it would move again. My safety and the safety of my passengers were put at risk because the vehicle was unexpectedly immobilized in active traffic. In one incident, the vehicle behind us almost struck my Odyssey because traffic had begun moving after the light turned green, but my vehicle remained stopped. This has also occurred while stopped on the freeway, including in a construction zone, creating a risk of rear-end collision and leaving my family, including children, vulnerable in traffic while other drivers were honking and attempting to move around us. The problem has occurred at least three times, but it has not yet been reproduced or confirmed by a dealer or independent service center. The vehicle/component has not yet been inspected by the manufacturer, police, insurance representatives, or others. Prior to or during the failure, the main symptoms were the stop-start system not restarting the vehicle correctly, flickering power, and the vehicle failing to move despite pressing the gas pedal. The symptoms first appeared during stopped-traffic situations, such as at red lights or during traffic stops on the freeway.

NHTSA complaint #11754550 — an unverified report by a vehicle owner.

ENGINE

I have experienced numerous instances where my car will stall at a stop light and then fail to restart, even with switching gears to park before resuming to drive.. I have had to turn on and off the engine multiple times at a si hole stoplight before the car would resume movement. This scenario has now happened at least 3 times. I am a mom driving a minivan of kids and this is concerning for our safety. These are not long stop lights. Sometimes even at a stop light I feel a strange pulling sensation.

NHTSA complaint #11754288 — an unverified report by a vehicle owner.

ENGINE

Starting problem. The vehicle sometimes (randomly) refuses to start after shutting off. For example, after filling gas, or turning off (idle off) at a stop light. It just refuses to start. Terrifying. Researched on the Internet and found thousands of complaints about this going back years. This needs a recall.

NHTSA complaint #11753940 — an unverified report by a vehicle owner.

ENGINE

Several times, The Odyssey won’t restart after the Auto Idle Stop kicks in at a stoplight.

NHTSA complaint #11754002 — an unverified report by a vehicle owner.

ENGINE

The van is experiencing the auto stop-start defect causing major safety issues for my family. The car stalls randomly at stop signs and stoplights and is unable to be restarted quickly, creating a major traffic and safety hazard. The car often will not turn on at start up. The dealer stated that it needed a new starter. Then said that Honda would not replace the starter until a tech looked at it. Then after several weeks still had not moved forward getting a tech. Then said to bring the van in for them to keep until they could get a tech, and offered a small car without room for the kids as a loaner for the indefinite amount of time they want to keep the van. There were no warning lights when it has happened. This issue is already being investigate by the NHTSA - Investigation Number EA25004. This is a known issue for Honda and I am unable to get a safe vehicle or get my vehicle fixed. Below, i have to choose a date for the incident, but this is ongoing and has happened on more dates that I can possibly log. It happens weekly, if not daily.

NHTSA complaint #11754054 — an unverified report by a vehicle owner.

ENGINE

The engine fails to restart on its own from a complete stop at traffic light, following the release the brake pedal (Auto Start - Stop). The vehicle will turn off in Drive while idling at the traffic intersection stopped for traffic light. This is a safety concern, that the safety sensor allowing for the vehicle to turn off while vehicle is in drive, could this also happen while driving.

NHTSA complaint #11753716 — an unverified report by a vehicle owner.

ENGINE

I was driving on a road around 30 mph when the engine cut off and shifted itself into park. No warning, no power, no movement. Car was dead in the road and I was unable to move it to the curb. I tried to press the drive button. Nothing. i pressed the starter button. Nothing. Parkway Honda said they could find nothing wrong other than replacing the battery. Car is brand new. Bought used at 6,000 miles and have only driven it 4,000 additional miles in roughly one year. Very dangerous defect for which they have no explanation.

NHTSA complaint #11753624 — an unverified report by a vehicle owner.

ENGINE

The contact owns a 2025 Honda Odyssey. The contact stated that on four occasions while stopped at an intersection with the engine idling, the idle stop feature activated, and the vehicle unexpectedly shut off. The mechanic was able to restart the vehicle. There were other drivers behind the vehicle who started honking their horns. Several unknown warning lights were illuminated on the instrument panel. The vehicle was taken to a local dealer to be diagnosed. The dealer inspected the vehicle and determined that the battery and starter needed to be repaired. The battery was replaced. The manufacturer was not contacted. The failure mileage was approximately 22,000.

NHTSA complaint #11753072 — an unverified report by a vehicle owner.

ENGINE

The transmission slips and misses constantly, ive taken it to the dealership repeatedly they say they feel it then they dont, its getting progressively worse

NHTSA complaint #11753183 — an unverified report by a vehicle owner.

ENGINE

Idle stop and restart problem: After stopping , the engine shut off and won't be able to restart. Happened multiple times even after the Honda services department re-programmed it.

NHTSA complaint #11752843 — an unverified report by a vehicle owner.