Engine And Engine Cooling Problems of Honda Odyssey - part 1

The auto idle stop function is failing. This has happened multiple times. Here is what usually occurs: when I apply the break at an intersection, the engine turns off, as it is supposed to. When I lift the brake again, the car does not restart, and it looks as though the entire engine is flooded. (that's the best I can explain it) the lights blink and it displays a message for me to press a pedal and button, I think. It all happens so fast. I have cars behind me and I'm freaking out because my car is essentially stalled. Ultimately, I am able to fix this by turning off the car completely and restarting. However, this has happened when I have been trying to take a left hand turn and I'm stuck in the middle of the intersection. I'm freaking out because my kids are in the car with me and there are cars also behind me trying to take the left after the light has turned yellow, then red. And I'm left fumbling, trying to get my car to restart. It is extremely concerning that the car doesn't restart on its own and has to be powered down. I never know when this is going to happen, but it happens rather frequently. And it happens many times when I'm just stopped, whether it be at a stop sign or stopping trying to take a right-hand turn and the car just turns off on its own.

Car has stalled multiple times at red light and intercection and failed to restart upon releasing the brake. Unable to restart car without waiting and trying to manually stop engine and turn car off and back on. This has happened multiple times almost causing an accident. Car has been taken to Honda for diagnostic of a known issue.

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Stopped at intersection and engine cut off due to auto-cutoff feature. When foot was released form brake, the engine failed to restart. It took approximately 30-45 seconds to get the vehicle restarted. Auto engine shutoff feature disabled for remainder of trip with no further issues. We have experienced this in the past as well 2-3 other times.

The vehicle continues to shut off its engine at stops and is unable to restart. This has been occurring at an increased rate since I initially reported it last summer. Warnings come on the dash as it struggles to try to restart. Recently it has started to take a full light cycle to get it to restart. I have to turn the vehicle off and wait some time and try restarting it. I’ve notified the dealership antrim Honda and their service advisor said it’s a known issue but the starters are on national back order and there’s nothing they can do to help.

I am reporting a serious premature engine failure in my 2019 Honda Odyssey ex-l at approximately 88,000 miles. The vehicle has its original factory-installed engine and has been regularly maintained, including routine oil changes. While driving with my wife and young children, the vehicle experienced an engine stall and loss of power, creating a significant safety hazard. An unexpected loss of engine power while in traffic or at highway speeds puts the driver, passengers, and surrounding motorists at risk. Following the incident, a Honda dealership performed a diagnostic inspection and identified abnormal noise originating from the lower engine block, consistent with rod knock. Metal debris was also found in the engine oil, indicating significant internal engine damage. The dealership recommended engine block replacement, with an estimated repair cost of approximately $14,000. The vehicle was deemed unsafe to operate. Honda informed me that my VIN is not covered under the existing engine recall. However, I am aware of NHTSA preliminary evaluation pe25008, which investigates connecting rod bearing failures in certain Honda and Acura vehicles, including 2018–2020 Honda Odyssey models. Given my vehicle's model year, original engine, internal engine damage, and loss of power while driving, I believe this incident warrants investigation in connection with pe25008. I am requesting that NHTSA review this failure, determine whether it is related to the connecting rod bearing issues under investigation, and evaluate whether additional vehicles excluded from the existing recall may be affected by the same safety defect. I can provide dealership diagnostic findings, maintenance records, photographs, videos, and repair estimates.

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Warranty extension for 2017 Honda odzssezy 6at torque convertor-dtc p0741 this is a known problem to Honda and first came to my parents attention when they received a letter in June 2025.   the letter was for a warranty extension 2017 Honda Odyssey 6at torque convertor-dtc p074. Car shudders when driving and my mom does not feel safe when driving. When we took the car into the dealer they did not see a dtc code so they said this would not be covered by the extended warranty. We opened a claim with Honda customer care and they said the warranty would not cover this as well. When the Honda mechanic finished working on the car he recommended we need a new torque convertor and a new transmission which cost $11,000. We just paid Honda dealer $510 to drain the transmission fluid three times and update the software; Honda contniues to say they will not warranty this because the engine light or dtc code does not display. My mom is 80 years old and I am worried about the transmission and engine issues and worried about her safety. I don't understand Honda knows this is a problem due to the numerous bulletins and will not help because we do not have a dtc code. Thank you for any help!.

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When auto shut off enables at stop lights, sometimes the car goes into park and seems to turn lff and has an error message. It requires pushing the brake and manually starting the car by hitting the on button. There is risk to a rear end collision since it doesn’t happen until you take your foot off the break to start after stopping so creates risk of a rear collision if cars behind don’t noticed you are stopped. It has happened multiple times and seems to happen even more frequently in eco mode.

The idle/stop function fails frequently at stop lights and stop signs. When it stops the engine it fails to restart and drains the battery. It began occurring very early on with the vehicle I’m guessing around 20,000 miles. I took it to the dealership while it was under warranty and they replaced the battery, and I believe the starter. It seemed to help for awhile but around 40,000 miles it started occurring again. I’ve been lucky to not be rear ended but drivers have had to go around me or sit through a stop light. There are no warning lights. I try to turn off the idle off button every time I start the vehicle. It is very unsafe and no longer under warranty. The dealership seemed like they didn’t know what was causing it last time and they had the van for over a week.

Engine fails to restart after auto idle stop - stalled in traffic twice on consecutive days. On xxx around noon, at [xxx], I was first in line in the left-turn lane at a red light, with my [xxx] daughter and another adult passenger aboard. The auto idle stop system shut the engine off. When the green left-turn arrow came on, the engine did not restart and a stall warning appeared on the dash. I had to confirm the van was in park with the brake applied, turn the vehicle completely off with the start/stop button, and press the start button many times before the engine started. The van sat stalled at the front of the turn lane, blocking traffic, for roughly 60 seconds during the green arrow. The night before, xxx around 11 pm, the same failure happened in the left-turn lane on [xxx]: the engine shut off at the red light under auto idle stop, did not restart when the green arrow came on, and I was stalled in traffic for roughly 60 seconds going through the same restart process. Since about late xxx the engine has also at times restarted roughly after auto idle stop, even when it does not stall. I could not read the exact warning message because I was stalled in live traffic. A dealer has not yet inspected the problem; the vehicle is being taken to a Honda dealer for warranty diagnosis and is available for inspection. I am aware of NHTSA investigation ea25004 into restart failures after auto idle stop on Honda vehicles, including 2018-2025 Odysseys. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

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My 2018 Honda Odyssey suffered a catastrophic engine failure while I was driving to work on the morning of oct 29. I had my vehicle towed to safford brown's Honda in glen burnie, MD. According to my service rep at the Honda dealership, the failure was due to the connecting rod bearings. After some research, I found that the v6 engines for Honda had a recall on them in 2023, recall no. 23v751000. I called corporate Honda, and spoke to a rep (jolene) there, she said that my VIN was excluded from the recall, and that the recall only affect those engines built at a certain factory. Further research found that NHTSA opened a broader 1. 4-million vehicle probe because engines built outside that original plant and timeline are suffering identical catastrophic rod bearing failures, like what I just experienced.

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The engine fails to restart automatically after shutting off at a complete stop (such as a red light or intersection.

The auto-stop/start feature in this vehicle, when activated, causes the engine to stall when starting back up. We have had the battery and starter both replaced, and it is still causing an issue. Now, even with the system deactivated, the vehicle will stall, most likely based on the increased wear on the starter. We have noticed that during initial startup, we have to press the ignition button several times before the vehicle actually starts, and often, when it does start, it struggles to start right away.

The contact owns a 2018 Honda Odyssey. The contact stated that while driving 60 mph, the vehicle stalled and lost motive power with several warning lights illuminated. The contact pulled over to the side of the road, shifted the vehicle into park(p), and there was smoke coming from the engine. The vehicle failed to restart after the failure. The vehicle was towed to a service center, where an engine failure was confirmed, and the contact was referred to the dealer for assistance. The vehicle was towed to the dealer, where it was diagnosed and determined that the engine and front axle had failed and needed to be replaced. The manufacturer was made aware of the failure by telephone. The failure mileage was approximately 117,000.

2024 Honda Odyssey ex-l fails to restart after stop.

Engine and vehicle completely turns off when auto start/stop engages when at complete stops.

The vehicle was slowing due to stopped traffic and the engine suddenly shut off (before the vehicle had come to a complete stop) and put itself into park. The vehicle could not be immediately restarted. The car was blocking traffic. After leaving the car off for approximately 10 minutes the car was able to restart.

When I come to a stop and the auto idle feature is enabled, my car sometimes fails to turn back on, and I am stuck, trying to get my car turned back on. It usually involves me completely turning off my car, opening the car door and then turning the car back on.

The auto idle stop (ais) on our 2025 Honda Odyssey will cause the van to stall and the engine will not restart. When this happens, our only option is to put the van in park, shut it down and then restart. Sometimes that van has not restarted for almost 90 seconds. We have had it into the Honda dealership three separate times for this issue. The first time they told us the battery was drained so they recharged for over eight hours. The last time they said "the battery fails the load test at this time" so they replaced the battery and stated that the vehicle was "operating as designed at this time. " since the last time we had it in for service (and with a brand new battery), the ais has failed on us twice. The last time (xxx) it nearly caused an accident on a busy road in northern virginia. When it fails to restart the van goes into a default type mode (where most of the service lights turn on or flash and we will have to put the hazard lights on, put the van in park, shut it off and then restart the van. This issue has happened to us about 12 times int he last 8 months. I am very concerned that this will cause an accident at some point and is putting my family's safety at risk. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Auto idle start stop system failed to start vehicle while. We were stopped at a red light auto idle shut down the engine once the light turn green and we attempted to move forward the auto start failed to cycle resulting in a stalled vehicle on the road, potentially increasing risk to passengers and other drivers on the road. This has happened multiple times.

My 2026 Honda Odyssey has only been driven for 7 months so far but several times has left me stalled in the middle of the road due to the auto idle stop (start-stop) system failing to restart the engine. When it happened today, I was stopped at a light, but when it turned green, the engine didn't restart, leaving me stuck in the middle of the road with cars going around me. This created a serious threat of a rear-end collision, which could result in serious injury or death. Three children were in the vehicle at the time, which is especially common for most people who drive this vehicle. When it occured, the dashboard displayed the message "to continue to drive, depress the brake pedal and push switch," but this did not work. The vehicle had to be completely turned off first then restarted normally. There was no prior warning or indications this would occur. The problem only occurs sporadically making it hard to reproduce by a dealer.

The auto idle stop (ais) does not work properly and is unsafe. When auto idle engages at a stop light, it is slow to restart, beeps and flashes the battery symbol, and sometimes fails to restart. On a more recent trip, when sitting on a freeway offramp waiting for the light to change with my entire family in the car, the vehicle completely failed to restart after ais engaged. We were sitting ducks on the freeway and were having difficulties restarting the van. We had to go into park, drive, and press the start engine button several times for anything to happen. This issue has been going on for a few months. The battery has been checked and is in good working order, no issues reported. The last battery check occurred today 11/5/2026. I am going to input the date the vehicle completely failed to start, since that time, I have tried to remember to turn off the ais feature when driving the vehicle. This is a new car and should not be experiencing this incredibly dangerous situation. 2025, Honda Odyssey elite.

My 2025 Honda Odyssey has repeatedly failed to restart after the auto-idle stop feature automatically shut off the engine while idling in traffic. This is a serious safety hazard that could leave the vehicle disabled in a busy intersection, exposing occupants and nearby motorists to the risk of a potentially catastrophic collision. Despite two starter replacements in October 2025 and October 2026, the problem has occurred multiple times. The authorized Honda dealership acknowledged this is a known issue but stated that no permanent solution is available. No warning messages were observed before the failures. A vehicle that can unexpectedly become inoperable in traffic presents an unacceptable safety risk and warrants urgent investigation and corrective action. Please associate the above statement with ea25-004.

The van turns completely off very often when at a complete stop. I am not referring to the auto start/stop feature which is equipped standard on the vehicle. The van physically turns completely off, as if I turned off the car, requiring me to turn the car on completely. This has created very dangerous situations as im often traveling trying to merge into traffic etc and the vehicle is off on active roadways. There is no warning, just turns off completely.

Our 2026 Honda Odyssey ex-l repeatedly shuts off completely while stopped at a traffic light or intersection and does not restart on its own. This is not normal auto idle stop operation. When the brake is released, the engine fails to restart; the vehicle must be manually restarted by pushing the engine start/stop button. This happened four times in the week of October 19, 2026 alone, in addition to earlier occurrences. Each time the vehicle is left stranded in live traffic in an active intersection, blocking traffic and creating a risk of a rear-end collision. No crash, fire, or injury to date. Approximate mileage 8,000. This appears to be the same auto idle stop failure-to-restart condition under NHTSA engineering analysis ea25-004, but that investigation covers only 2018-2025 Odyssey -- this vehicle is a 2026, outside its scope. The vehicle is under factory warranty. We request that the investigation be expanded to include the 2026 model year.

Sometime when the engine auto stops it doesn't start again.

Start stop engine when on drive, car wont tyrn on got stuck on a interstate very damgerous I consider this a lemon.

I've had multiple instances where I would be stopped at a red light, when when the light turned green, the car would not accelerate. I would have to turn the engine completely off and back on. This is a safety issue as I'm sitting in traffic and cars/vehicles behind me are expecting me to go. My fear is that someone not be watching my van but the light and accelerate before I am able to move forward. My son, a mechanic, looked at the vehicle. His suggestion was to replace the battery - the vehicle was purchased March 2025, and should be too soon to have to replace the battery. However, when attempting to start it, it sounded like the battery was dying. A couple of weeks after replacing the battery, there had been no issues. I had been driving the vehicle around 20 minutes, most of that at highway speed (80mph on the toll road). I was idling at a red light. When the light turned green, the vehicle would not come out of the idle mode. I could not switch from drive to park. I could not turn off the engine. I sat in the road for a minute and a half to 2 minutes (as I sat through an entire light cycle) before the van would finally allow me to turn off the engine and turn it back on. There was no warning, messages or other issues prior to this happening.

The auto start-stop system fails frequently. If I do not turn off the system, when I stop on red light, the engine turns off as expected. However, it frequently fails to start. The car stalls and it's difficult to turn back on. I need to turn the car off completely first, then try to turn it back on. This usually takes 10-20 seconds. The situation presents a safely hazard as I'm not able to continue to drive through an intersection on a green light. I took the car to dealer 3 times. They were not able to reproduce he issue nor find the cause of the problem.

Multiple times since new the van has failed to restart when the auto start/stop has activated. This leaves me in an intersection with a non running car that I need to figure out the right combination of buttons to get it started again. Today it escalated and refused to restart until I shut off the ignition, open the door, closed the door, and then started it. Honda will not do anything if they can not duplicate it. So I am left with a car that is getting more unsafe to drive.

On xxx my 2026 Honda Odyssey touring, bought new on xxx and driven about 6,000 miles, was stopped at a red light in [xxx], with auto idle stop engaged as designed. When the light turned green and I released the brake, the engine did not restart. The transmission shifted itself into park, and the display showed a message to hold the brake and press d to restart. I followed it, but the vehicle would not shift into drive. The only way to get moving was to turn the vehicle completely off and restart it with the start button, stopped in a live traffic lane while cars behind me honked. The vehicle was disabled without warning in a travel lane at an intersection, exposing its occupants to a rear-end collision. Had the same failure happened while I was turning or crossing an intersection, the vehicle would have been stranded in cross traffic. For about two before this, restarts from auto idle stop had become slow and labored, with a noticeable delay before the engine caught. No warning lights appeared before the failure. The failure appears to involve the auto idle stop restart system. The vehicle has not yet been inspected. It is scheduled for warranty diagnosis at a Honda dealer on xxx, and is available for inspection on request. I understand NHTSA’s engineering analysis ea25-004 covers this failure on 2018–2025 Odysseys; this 2026 model shows the same failure. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Vehicle was at a stop light and engine turned off via the automatic idle engine stop. However, when I tried to press the gas the vehicle put itself in park and flashed a battery warning. I had to restart the car 4 times before it would turn back on and drive.

The auto idle stop system shuts the engine off when the vehicle is stopped, but intermittently fails to restart the engine. The engine does not turn on again until the car is restarted manually. This has happened approximately 10 times. The vehicle is left disabled in traffic until it can be restarted manually. The vehicle has not been seen by a dealer for this issue yet.

My 2020 Honda Odyssey ex-l intermittently fails to restart after the auto idle stop feature shuts the engine off at a red light or stop. This has happened probably 10 times in the past 6 months. In order to start the engine, I must recognize that the engine isn't starting, turn off the vehicle, and turn it back on, often 2-3 times before it actually starts. This leaves the vehicle stopped in a traffic lane at an intersection with traffic trying to pass, which creates a risk of rear-end collision or cars trying to pass me. Cars have gotten into near misses trying to pass me while my vehicle is inoperable. I have no warning lamps or messages before it happens. History: the dealer performed Honda’s idle-stop software update (service bulletin 23-008) in November 2024 at about 63,100 miles. The problem continues. The battery was replaced in December 2022, and the dealer’s October 2026 inspection rated the battery “good. ” (as did a second independent auto shop). At 93,331 miles in October 2026 the dealer documented the complaint, charged a diagnosis fee, and recommended replacing the starter motor at a cost of $954. 53 plus a diagnostic fee of $184. 95. I contacted Honda, which opened a case and offered only partial goodwill coverage. I am not aware of any additional recall or warranty extension covering this on my model. This appears to be the same condition as NHTSA investigation ea25004 (no restart after auto start/stop engages), which covers 2018-2025 Odysseys. The failure persisting after the software update matches the investigation’s finding that complaints continue after Honda’s countermeasures. I can share vehicle inspection records if helpful.

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When idle start activates at a stoplight sometimes the car will not start when you take your foot off the brake. Car then takes several tries but it will start again. This is a dangerous situation and can lead to accidents. Only seems to happen randomly after the car warms up. Dealer did replace the battery but it did not fix the problem. My guess is the starter does not perform correctly after heat soak in the engine bay.

My car has shutoff due to an orange system error of the idle auto stop/start system. This appears connected to ea25004. When at a traffic light, after the engine shuts off, my car occasionally fails to restart or is slow to restart when reapplying the gas. If the error occurrs, it requires me to shut off the car, restart the car, and shift into drive before I can move. This is dangerous for following vehicles in close traffic. The dealership was unable to replicate the issue and did not provide replacement parts.