Engine And Engine Cooling Problems of Honda Odyssey - part 1

2025 Odyssey with 19k miles; starter failure; after running/ driving vehicle continuously for 45 minutes in 80(f) degree weather, stopped and turned off vehicle completely. Tried restarting after 5 minutes, engine turned over twice, but did not start, and auxiliary features stayed on as if vehicle was running. Attempted again, heard click, as if engine attempted to turn, but no start. Checked engine visually, noticed engine bay was hot, but fluid levels all were within recommended ranges based on container-marked levels. After turning vehicle off, waiting 10 minutes and using battery jumper, engine started and stayed running. This is concerning as the vehicle features an auto-start feature that can turn off my vehicle in traffic, and leave me stranded at an intersection or worse if the starter fails.

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With the auto start engaged, the car has stalled several times in the middle of intersections with my family in the car. Over the course of 12 months, this has happened 5-6 times. In each case, we have to shut the car off and try to frantically turn it back on. Sometimes this takes a few tries to get it to start. It’s frustrating that there is no option to permanently turn off the auto start feature. However, within the past 2 months, there have been 3 times that the car won’t start right away from an off position. It takes a few tries to get the engine started. The van is less than a year and a half old and only has 18,000 miles on it. This shouldn’t be happening, particularly in the middle of an intersection if I forget to turn the auto start off. Honda has not replied to my inquiries and the dealership can’t/won’t do anything about it because they can’t replicate this issue.

The vehicle stalled at a traffic light and would not go into park or shut down to restart for about a minute. There were no warning signs or warning lights. It is a safety issue due to this potentially happening in the middle of an intersection while waiting to turn. The vehicle is being taken to the dealership on Wednesday, July 1st.

The automatic engine shut off at stop doesn't always restart engine when moving again. This has happened several times where the engine doesn't restart after the engine shut off is engaged. This is the same issue as reported in NHTSA action number: ea25004.

See all problems of the 2020 Honda Odyssey 🔎.

When I come to a full stop and the idle stop feature engages, sometimes the engine will not restart. I get a message saying to press the button to start the engine, but it does not start after doing that either, so I have to shut the car off and restart it. There are a bunch of lights that flash when this happens.

While stopped at a redlight the auto idle stop engaged and engine shut off. When releasing the brake to accelerate the engine failed to restart and completely stalled in traffic requiring a manual restart. Warning lights flashed on the dashboard. Then the same thing happend when stopped at a stopped sign.

The auto start/stop feature doesn't work as needed. It will randomly lurch, turn the car off make me put it in park and then have me restart it. Sometimes the car does not start right away and I am stuck on the road until it decided when and if it will restart. Myself and my family of 5 are not stuck in the road scared of getting smashed into by other drivers unaware that we are stopped or anticipating for us not to be stopped in the middle of the road. I really dont want my family to go to the hospital or die because of this nonsense. Sometimes it doesn't fully shut off but will give error warnings like collision mitigation assistance even though there is nothing for it to mitigate. There are no cars around me and it shouldn't have done this. This has been happening for some time and only happens haphazardly meaning I can't always have the dealer identify or diagnose the issue. Then when I brought it to the dealer, they told me it was because of a power liftgate module error. Which was not true and didn't solve the issue.

When the engine shuts off while braking at a light/stop sign etc occasionally the car will fail to turn the engine back on and the car will go in to park and the only way to get in to drive is to restart the car. This happens once or twice a month.

Auto idle stop feature has caused the vehicle to stall / shut down at a stop light on several occasions causing hazard when we can't drive. Entire engine has to be stopped and restarted which is scary in heavy traffic.

While in traffic, the van goes into idle and then will not restart. This has happened to us at least 5 times. The frequency has increased and now occurs at least once a week. We are very much worried about how unsafe this is because we could be hit from any direction while in active traffic. We noticed NHTSA investigation (id# pe25-03) is already underway and feel that the issues apply to our situation. We need immediate help please.

All warning lights began flashing after a srs recall fix at Honda of joliet, illinois. Dealer wanted to do a in depth vehicle scan for $279. I brought it to an independent care repair shop where they did the scan for $199. They found engine damage per attached report. My vehicle’s VIN was not included in the initial recall for the same problem for the same vehicle, year, and engine type. Contacted Honda customer service a more or less ‘good luck’ response.

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Warning lights began flashing on dash. Brought van to repair shop and was told and show leakage of oil into cylinders with metal shavings visible. Also heard a ticking sound while idling for a few weeks. Van only has 145,000 miles on it and was regularly serviced.

The auto idle/stop caused my engine to stall not once but twice in the past few weeks while on a major highway. Light turns green and my car won't start back up. I have to let the car sit for a second then restart the car while traffic is flying past me on this highway. Absolutely ridiculous that my brand new car is having these issues and that I am unable to turn this feature off permanently.

I am reporting a critical safety issue regarding the auto-start-stop system on my 2025 Honda Odyssey. On June 15, 2026, the vehicle's engine shut off at an intersection as designed but failed to restart, stranding the driver in active traffic and presenting a severe safety hazard. I previously brought the vehicle to an authorized Honda dealership approximately two weeks prior to this incident after noticing early symptoms of this failure. At that time, the dealership diagnosed the issue as low battery voltage and replaced the battery; however, this repair did not resolve the underlying fault. The vehicle continues to unexpectedly stall during traffic stops due to the auto-start-stop failure, representing an ongoing and significant danger to the vehicle occupants and other motorists.

Stopped at a stoplight, the engine will just die. It won't start again by pressing the gas peddle. It will require a few moments to try to restart it. It is very stressful and dangerous when people are waiting behind you. This is not safe. It won't happen every time but the few and far between are not good. We have replaced the battery and it sounds like other people have had this problem but no recall has been made to fix it.

See all problems of the 2021 Honda Odyssey 🔎.

Vehicle shuts off completely when stopping at a light or sign. It does restart but you don't know it until you need to go. It is a safety concern!.

Engine will fail to start when shut off to stop light or when shut off at anytime when engine is hot. Very dangerous situation. Acts like starter is dragging. There is a clunking in the steering column when making a turn mainly to the left that can be felt in the steering wheel. Driver seat is splitting open on the side. Keeps setting code p0441 for evap system. .

Vehicle shuts off with with the start/stop feature. Then will not restart the motor after taking foot off the brake causing a dead vehicle in the road with no warning. Then its a scramble to get it to restart and its difficult to start. This happens at random and seems like Honda refuses to fix.

2025 Honda Odyssey auto idle stop fails to restart engine after automatic shutdown at intersections; vehicle must be restarted manually; safety hazard; repeated occurances; video documentation made. Reference: NHTSA ea25004.

-defective starter. -starter randomly fails to restart vehicle after being warmed up. -when the DC motor internal copper windings get heat soaked after being driven and warmed up, the motor's internal resistance gets too high to draw sufficient current to turn over engine properly. This happens when intentionally shutting off motor (ie. Getting gas, going into a store then coming out in a few minutes), the engine either will not crank at all, or cranks about two engine revolutions, will not start and then stops trying and remains in full accessory mode. It will not attempt a restart either. The only remedy is to fully shut down the vehicle, then try a fresh start after a few seconds. Sometimes it will start the engine, sometimes it will repeat the issue and you have to try again. This is extremely dangerous when this problem occurs when the vehicle is at an intersection or traffic light, shuts itself off due to the auto-start/stop, then fails to restart the engine when expected when the light turns green. Especially at traffic lights if you're the first car in line. , and especially if you're the first car to go with traffic behind and in a single lane of traffic. Having to totally shut the car down, then do a fresh restart while blocking an intersection with tons of cars behind and all waiting on your car to decide if it wants to re-start with cars flying around you into the shoulder or ditch to get around is an extremely dangerous position to be in, forcing other drivers into doing ridiculous things to get around you and will if not already cause major accidents. I believe Honda knows this is an issue. They are blaming bad batteries and alternators which can easily be ruled out with independent battery and alternator testing in the vehicle, while the problem of no/slow cranking remains. The problem is defective starters, that have or will absolutely cause accidents by stranding vehicles in intersections because of failures to restart.

My 2026 Honda Odyssey was stopped at a traffic light with auto idle stop engaged. When traffic was ready to move, the engine appeared to restart for about half a second and then shut down. The vehicle then shifted itself into park and would not resume normal operation. The battery warning light was illuminated. Pressing the engine start/stop button caused all of the screens/displays to turn off briefly, but they came back on in the same failed state. The vehicle was disabled in traffic at an intersection. The component or system that failed appears to be the auto idle stop / engine restart system, possibly involving the starter, starter relay, battery/charging system, or engine control software. The vehicle is available for inspection upon request. My safety and the safety of others were put at risk because the vehicle unexpectedly failed to restart and became disabled while stopped at a traffic light, creating a traffic obstruction and risk of being struck from behind or causing other drivers to maneuver around the vehicle. The problem has not yet been reproduced or confirmed by a dealer or independent service center. Unknown whether diagnostic trouble codes were stored. The vehicle/component has not yet been inspected by the manufacturer, police, insurance representatives, or others. There were no warning lamps, messages, or symptoms prior to the failure that I noticed. The battery warning light appeared after the engine shut down and the vehicle would not restart normally.

Our vehicle has stalled at stop lights several times over the past 6 years. The auto stop/start feature seems to fail. The vehicle will shut off but when you repeat the brake it will not restart and the vehicle will die completely. You have to put it in park, wait a few seconds and try and restart. Additionally it has completely died at gas station after turning it off to refuel. When you go to start the vehicle it will be completely dead, zero power. We had to have it jump started. The battery has been replaced twice and was testing normal at the dealership. Not a battery issue. Honda acts like this is unheard of but our own research indicates it is a common well known problem with new Odyssey models.

Electrical restart feature failures, battery dash indicator comes on and the restart feature won’t engage. This has happened on several occasions on busy roads with lights vehicle won’t move without manually turning off vehicle and putting into park to restart. Was almost rear ended by large truck after being unable to restart vehicle after being stopped at a red light.

Vehicle on numerous occasions has had a complete electrical failure during an auto stop that has caused the engine to turn off and needed manual reboot several times for the car to restart.

I was driving on a highway and all of a sudden, I see three warnings appearing on my dashboard - "emission system problem", "blind spot info system problem", "transmission system problem". I continued driving but then my vehicle started behaving weird. It started shaking while driving. Luckily, I was close to my exit and l somehow managed to take the exit but I wasn't able to move forward when the road was uphill. I somehow managed to park next to a house and walked back home. It was a really scare drive from the time those errors showed up to when I parked. This all happened few minutes ago. Here below is a thread where I can see others having this problem. [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

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The contact owns a 2020 Honda Odyssey. The contact stated that while reversing at an undisclosed speed, the vehicle stalled. No warning lights were illuminated. The vehicle was towed to a dealer where it was diagnosed and it was determined that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 59,000.

Vehicle has auto start/stop and when shutting down at a stop will fail to start back up. Have to shut vehicle down completely and then try to start back up.

Bad starter. When utilizing auto start/stop, the engine would fail to restart at stop. The car would need to be shifted back to park, turned all the way off, and then back on to restart, resulting in a delay - an unsafe practice at an intersection.

Auto idle stop (ais) system fail to restart: the engine fails to restart on its own after a complete stop at a traffic light or intersection with the auto start/stop function engaged, putting the driver in dangerous and panic situation.

The auto idle stop has failed to restart the car when stopped at a traffic light. This has happened twice now, and has caused me to become a road hazard as I am not able to get the car turned back on before the light turns green. This has happened twice in the past month (may 7 2026 and June 1 2026). Have not yet taken the car back to the dealer. No warning lights or anything came on prior to the incident. Just stopped at a light and the engine stopped, then did not turn back on when the brake pedal was lifted.

My vehicle has failed to restart at intersections when the idle start stop feature is engaged. Have to put car in park and manually shut off car and restart the car to get it to restart. Get an error code for a little while about brake issue.

Believe camera sensor in windshield or behind Honda emblem causing issues with 2019 ex-l model/ car will pop up 8 different codes ending with "transmission system problem" making vehicle unable to operate. In addition to transmission problem, it also turns off all safety features in vehicle. I have had numerous people complain about this problem as well. Can we please get this recalled and fixed??.

I own a 2018 Honda Odyssey 3. 5l v6 and while my wife and 9 year old daughter were driving down the highway at 70mph that car decided to throw a rod throw the bottom of the motor leaving my family stranded on the roadside with no motor oil left in the car. This is a known issue for the 2018 Honda Odyssey but only for certain VIN numbers. I think it's pretty clear from all of the online complaints from this same year that it's not only those VIN numbers. We have always replaced the oil at 3,500 miles with mobile 1 syntenic 0w-20 and always check the oil level to make sure none is missing. For the car to just throw a rod at 157k miles is pretty concerning as this will require a entire engine replacement out of pocket cost as Honda will not take ownership of this even though this year and model is known to have issues. I would like to see more VIN numbers added to their recall because this isn't fair to the people who buy a car for reliability and are left stranded on the roadside for a known issue they are not being forced to stand behind and make right. Please help me.

The vehicle is experiencing a dangerous hesitation during acceleration at low speeds, immediately followed by a sudden, violent forward lunging motion. When attempting to accelerate from a complete stop, or when rolling at low speeds (such as yielding at a roundabout, turning through an intersection, or merging into slow-moving traffic), the vehicle suffers from a distinct * or complete failure to accelerate** for several critical seconds. In an attempt to get the vehicle to move out of harm's way, the driver naturally applies more pressure to the gas pedal. The vehicle's transmission then randomly responds after a few seconds with a violent lunge forward, spinning the tires and causing the vehicle to surge unpredictably. This unpredictable behavior creates an immediate and severe safety risk to the occupants of my vehicle and others on the road: 1. Intersection collisions: the sudden lag leaves the vehicle stranded in oncoming traffic during turns, while the subsequent lunge threatens to overshoot the intended lane. 2. Pedestrian hazards: the sudden, uncontrollable lunging makes low-speed maneuvers in school zones, crosswalks, and parking lots incredibly hazardous. 3. Drivers behind behind me do not expect a vehicle to suddenly stop accelerating after it has begun to move forward. I have taken the vehicle to the dealership we're we were able to reproduce the issue and Honda would not offer a fix. I thought I was going to get my entire family killed the other day when I pulled out at a stop the van hesitated in the middle of the highway for a few seconds before lunging forward. This is an intermittent issueand the severity varies each time, but is commonly cited online.

While stopped at a red light the engine turned off with the engine restart function. When I released the brake the engine attempted to start and then completely stalled. I had to get the vehicle in park and restart the engine with took it a few attempts of pressing the start button. The has happened a few times with this vehicle. Dealers have been unable to replicate the issue to try to solve the problem.