2025 HONDA ODYSSEY Engine Problems

When the Auto Idle Stop is engaged, I have now had 3 instances of the engine completely stalling when at a stop. Not only has the engine stalled, but I have difficulty getting the engine to restart. It has been very scary, as it has left me disabled at busy intersections while I struggle to get my van to start so I can move and pray nobody hits me while I sit there. I've even had to open the driver's door to get the van to restart. We've made a habit of manually turning the auto idle stop feature off every time we drive it. This problem has not occurred when the feature is turned off. The first incident of this was several months ago, and I already took it to my local dealer but they couldn't replicate the issue and did nothing about it.

Over the past month, I have experienced several incidents where my 2025 Honda Odyssey’s Auto Idle Stop (AIS) system failed to restart the engine after stopping at traffic lights. Each time, the engine did not turn back on when I released the brake, leaving me stalled in traffic and prompting error messages on the dashboard. There is currently no way for owners to permanently turn off this feature. When I took my vehicle to the dealership, I was told my starter was already having issues despite the car having less than 10,000 miles on it. This ongoing problem has made me concerned for my safety and the reliability of my vehicle.

My 2025 Honda Odyssey has been completely shutting off after the stop-start shuts the engine off. When the car actually “stalls” is when I let off the brake and it’s time to start going. Then I hear a ding, the dash lights come on, and I have to frantically hit the ignition button. This is happening at stop lights where there is the risk for other cars to safely go when the light turns green. I have to completely shut off the car and restart the engine while traffic is going on green.

Vehicle shuts down and will not restart. So far this has happened three times. After a long delay, took foot off gas, held brake and pushed start and would not start. On third attempt vehicle was very labored on start

Idle stop engine turned engine off at a stop light. When the foot was removed from the brake pedal the engine struggled to start up. It took several attempts to get the engine to start up. This has occurred before and the dealer replaced the battery. However, it is now happening again. There were no warnings .

Stopped at red light. Auto start/stop engaged. Light turned green let off of brake and pressed gas. Engine did not start. Couple seconds later engine started.

When the vehicle is stopped, and the auto-shut off engages, the vehicle will turn off, and the vehicle has to be restarted. Quite dangerous when in traffic and the vehicle is dead due to the auto-shut off not starting again. The fix is believed to be an updated starter engine computer and starter motor.

The contact owns a 2025 Honda Odyssey. The contact stated that while driving at an undisclosed speed, the vehicle stalled. The check engine warning light was illuminated. The contact was unable to pull over to the side of the road. The contact turned on the hazard lights. The contact waited to restart the vehicle and after several attempts the vehicle restarted. The contact stated that upon depressing the brake pedal and pushing the Start button, the brake pedal was stiff while the start button made an abnormal beeping sound. The message "Press the Brake Pedal and Push the Start Button," was displayed. The contact was able to continue driving; however, the vehicle failed to accelerate as intended while depressing the accelerator pedal. The failure had occurred four times. The vehicle was taken to the dealer to be diagnosed; however, the cause of the failure could not be determined. The vehicle remained at the dealer undiagnosed and unrepaired. The contact no longer felt safe driving the vehicle and left the vehicle at the dealer. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was 18,886.

Mileage: 18,886

The vehicle intermittently fails to restart after the auto start/stop stopped the engine. This happened several times when stopped at a traffic signal, nearly causing an accident when cars behind expected to move after the traffic signal turned green. There were no warnings or indications prior to the failure to start. Multiple attempts to restart the vehicle failed until at least a minute or so had elapsed. The vehicle has also intermittently failed to start after being parked for a few minutes after being driven for 20 minutes or so. The starter has generally sounded weak when starting, and when it fails to start it sounds like the engine tries to start turning for a fraction of a second before it stops trying to crank the engine. It almost seems like the start duration is too short or the ECU thinks the engine has successfully started when it hasn't. I brought the vehicle into the dealership to have this checked, and they replaced the battery saying it was bad. However, the failures to start continued to happen shortly after. I returned the vehicle to the dealership to be checked again. They have not yet identified anything that could be causing the issue. They claim the battery and starter test good. Based on similar complaints, it seems that this is an issue with many of these vehicles. Honda needs to identify the root cause of this failure to start issue.

6 month old new Car stalled out at red light Took a few minutes to restart Think it had to do with idle start/stop

With vehicle auto start/stop feature enabled, vehicle just shuts off when attempting to start back up after shutting off at a stop light. It has happened multiple times and recently it even happened with the auto start/stop feature turned off. Took it to the dealership and they tested everything to include the battery and they weren’t able to duplicate it. A review of forums showed other people with the same issue and it is pointing to a faulty starter, but no recall has been issued yet.

The Idle Stop feature failed to restart the engine when I released the brake after having stopped at a traffic light. Eventually restarted after more than a minute of manually pressing the ignition button.

Auto start/stop functionality has resulted in vehicle stalling mid traffic as vehicle does not start and shutdowns. This has occurred in multiple occasions and most recently almost caused an accident with my family. We sent to dealer who checked battery and stated to issues. There were no warnings and dealer was unable to reproduce as they didn’t drive the vehicle. I have concerns with this new vehicle after finding other reports of this issue.

The car stalled then stopped when I was at a traffic light, I had to press the start engine button multiple times to restart the car. This issue has occurred 3 times within the last two months.

My car has been dying when I stop at stoplights. We took it into the dealership and they said the battery was sending error messages. So we replaced the battery. It is doing it again. Sometimes it starts but it is getting progressively harder to restart it. It is dangerous to be stalled at an intersection. The car is not even a year old.

The idle stop system is malfunctioning. I had it inspected once previously and now trying to get it inspected again for the same occurring issue. The dealership continues to tell me to turn off the idle stop feature on the vehicle. My safety was put at risk because of the vehicle stalling and not kicking back on while being stopped at a redlight on a busy 4 lane highway multiple times now. The first time, I was by myself. The second time, my 8-month-old was in the vehicle with me. This causes a lot of panic as there are impatient drivers around me since I am unable to move my vehicle. I fear that this could happen on a freeway if there was construction, an accident or even while trying to turn in an intersection and getting hit because I can’t move my vehicle and often have my two small children with me. The first time the idle stop stalled, it occurred twice in a week. The first time was rather quick, and the engine kicked over quickly so I did not think anything more of it. The second time which happened a few days later (9/17/25), took about 5 minutes to get the engine going again and moving on the road (4 lane highway). I took it back to my local Honda dealership where they performed a diagnostic test and discovered the battery had dipped down to 7.22V when trying to restart, the battery failed the battery test and ended up being replaced with a new battery. The idle stop issue has now happened for a third time (10/21/25), with the same issues occurring and I am waiting to be able to get back into Honda. The vehicle has only been looked at by my local Honda dealership. There were no warning lamps, messages, or other notifications prior to the failure. I received a warning on the dashboard after the events occurred on how to start the vehicle. This is very disappointing as a new Honda owner. My husband and I decided on Honda over other car companies due to their reliability and this has now become a constant worry.

Honda Odyssey EX-L sport 2025 has been facing the issue of idle stop not working causing engine to stall, engine failing to restart, shutting off completely during mid traffic especially during adaptive cruise control operation. This is causing an unsafe driving situation. While this issue was reported to Scott Clark Honda multiple times and they have claimed to fix this issue in Aug 2025, the issue continues to exist and root cause hasn't been fixed. This seems to be related towards the on-going investigation by NHTSA. Please help to resolve at the earliest since no further support is being received from Honda.

Since July 4, 2025, this can has intermittently shut off and stalled on me, my wife and my family and has refused to start. It has now been back to the service department of Trust Honda of Palmdale 4 different times for the same problem and the battery has been replaced on this van back in July. Most recently, it stalled just two days ago in rush hour morning traffic on the 405 Freeway going South in the San Fernando Valley. The display on the dash read “dead battery “. It took over 20 minutes for the van to start and my wife was able to move it off of the freeway to a safe location.

Description of the Problem I am filing this complaint regarding a serious safety concern and poor quality repair on my 2025 Honda Odyssey, which I purchased new less than one year ago. 1. Engine Auto Idle Stop / Starter Failure Issue The vehicle suddenly shut down when the “Auto Idle Stop” feature was activated. This incident occurred multiple times, and I was unable to restart the engine until several attempts later. This creates a dangerous situation, especially in traffic or intersections. When I contacted the dealer, they confirmed that the issue is caused by a starter motor failure, and the replacement part will not be available until early November — meaning I must drive for over a month with this feature turned off. Many other owners have reported similar problems online, which strongly suggests a potential defect that should qualify for a safety recall. 2. Water Leak and Poor Quality Repair My vehicle also experienced a water leak from the roof area. The dealer attempted to fix it by simply applying sealing material on the roof molding (see attached photos). The repair looks extremely unprofessional, and I requested them to properly replace or reinstall the roof molding, but they refused. This type of repair is unacceptable for a new vehicle of this class and price. 3. Honda’s Unsatisfactory Response I contacted Honda Customer Service (1-800-999-1009) and spoke directly with a representative. However, I was told that: They cannot extend the warranty. They cannot offer any compensation or goodwill service. They cannot provide me with a record or copy of our phone conversation (even though they recorded it). They will only repair the starter once parts arrive. I explained that I have already spent time, fuel, and lost work hours visiting the dealer multiple times, yet they refused any support. Safety Concern and Requested Action The engine shut-off issue clearly affects vehicle safety and could cause accidents in traffic. I request that NHTSA inv

When I stop, they start stop, turns the engine off, but when I release the brake, the engine struggles to turn over and sometimes doesn’t and I have to put it in park to restart it. I have taken it to the dealership already once, but they said they weren’t able to reproduce it. I will be taking it back to the dealer to try again.

The issue involves the auto start/stop system on my 2025 Honda Odyssey Touring. When the feature is turned on, the vehicle intermittently fails to restart after coming to a complete stop. The problem does not occur when the start/stop system is disabled. During normal driving, the engine shuts off as expected at a stoplight, but when I release the brake, the vehicle hesitates or fails to crank, leaving it stalled in traffic. The Honda dealership confirmed the issue and stated that the starter motor needs to be replaced. The van has approximately 9,300 miles. No warning lights or messages appear before the failure. The problem occurs only when the start/stop system is active. This presents a safety concern, as the vehicle can lose power and fail to move when traffic lights change or when merging, increasing the risk of a rear-end collision or blocking intersections. The vehicle is currently being inspected and repaired by the Honda dealer and is available for inspection upon request.

Two concerning and dangerous malfunctions are occurring. 1.)When car is stopped at a light for more than 45 seconds the car engine shuts off, when I press on the gas the dashboard lights up and displays a battery light and advises me to restart the car. The car struggles to turn over. 2.) The car struggles to start on initial start as well. The dealership replaced the battery and it continues to happen, they advised me to disengage idol stop every time I start my vehicle to save the starter and prevent the car from stalling. This is obviously a problem with the Honda idol start that needs to be addressed. There are multiple threads in online forums about this issue with Honda.

Three times now since buying my van about 6 months ago brand new, I come to a stop light, the engine turns off, but then it won't come back on when the light turns green. I have had to put my hazards on while I frantically push the start button multiple times. Eventually it will start up but takes 1-2 minutes. I brought it into the dealer the first time and they blamed it on a weak battery. After it happened 2 more times, they are replacing the starter but I'm afraid that's not going to fix it. While I wait, i just have to turn off the idle start/stop button every time I start my van.

Idlestop fail to restart engine multiple occasions at busy intersections.

The contact owns a 2025 Honda Odyssey. The contact stated that the Engine Auto Start-Stop system failed to operate as needed. The contact stated upon coming to a stop, the engine shutoff; however, upon releasing the brake pedal, the contact became aware that the engine failed to restart as designed. A message of a systems failure was displayed, and an image of a pedal and the Push to Start button were displayed. The contact was able to manually restart the vehicle immediately. The contact stated that the failure had been recurring and had worsened. The contact stated that the vehicle could only be manually restarted after 10 minutes, nearly causing a crash. The dealer was contacted, and an appointment was scheduled for a diagnostic test. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 16,000.

Mileage: 16,000

The idle engine feature is defective. Often, when stopped and the engine goes idle, it will not restart when the driver releases the brake. The van stalls, and the driver is forced to move the vehicle into park and start the engine again. This is dangerous and stressful because the driver behind you expects you to go, especially when the light turns green, but you are stalled, potentially leading to rear-end accidents.

Brand new vehicle and system shuts down a few times when in idle mode..(stoplight, stop sign) then I need to restart the car again.

At a stop, the fuel save system shut the car off. When you take your foot off the brake the van fails to restart. If you try to restart using the push button the car will still not start because the transmission is still in drive. Then it takes awhile to get the transmission into park/neutral and then the van will start. The problem is intermittent 3 times in the last 2 months. No accidents just blocking traffic. My wife doesn't like that.

After going into Auto-idle at a traffic light. The engine did not turn back on when accelerator was pressed. Even after a restart. It took about 30 seconds.

I think there is a problem with the Auto Idle Stop system that has resulted in the starter needing to be replaced. But, the dealership says nothing is wrong. The Auto Idle Stop malfunction lights up when I let off the brake. I have gotten in the habit of turning off the AIS every time I started the car. However, it still is hesitating to start, which leads me to believe the AIS has killed the starter.

Van completely shut down while in an intersection and the battery light came on. It was hard to restart. Took it to the dealership and they cannot find the problem.

The auto on/off while idling will randomly fail. The car stalls, all emergency lights turn on and the car won’t start for a few minutes. This has occurred at stop lights and in traffic after coming to a complete stop and the car turns off when idling. The car is only 6 months old. The first occurrence happened at the 3 month mark and has become more persistent. I’ve had my battery checked and that was not an issue.

While driving in a construction zone, the vehicle's lane departure system jerked the wheel and almost made me leave the lane Very dangerous. Same vehicle, the A'C was found not operating and a dealer diagnosis found that the system was overfilled and that an electrical connection was not hooked up from the factory. Same vehicle, body panels are not properly aligned from the sliding door to the passenger side door, gap is almost 1/2 inch.