2025 Honda Odyssey Powertrain (other) Problems

While driving and coming to a red light applying brake coming to a stop the vehicle completely shut off. All lights turned off no power was going to the vehicle leaving us in the middle of the road while light turned green and then back to red twice we were just stopped with no electrical activity on the vehicle. This happened three different occasions another occasion was during traffic stop and go at a stopped point it shut off again.

NHTSA ID

11776557

Incident

Nov 6, 2026

The vehicle is experiencing an intermittent but highly dangerous defect involving the factory-installed Auto Idle Stop system. When the vehicle comes to a complete stop at intersections, traffic lights, or in stop-and-go traffic, the Auto Idle Stop system engages as designed and shuts off the engine. However, upon releasing the brake pedal to accelerate, the engine fails to restart automatically. Instead of seamlessly restarting, the vehicle completely stalls in live traffic. The dashboard instruments remain on, but the engine drops completely out of operational mode. To recover propulsion, the driver must shift the vehicle entirely into Park, press the start/stop button to cycle the ignition completely off, and then manually restart the engine. This creates an immediate and severe safety hazard. The sudden, unprompted loss of propulsion leaves the vehicle completely stranded in active intersections and roadway lanes, exposing the occupants to an imminent risk of a rear-end collision. The restart delay forces the driver to perform multiple steps to reset the vehicle while traffic builds around them. The manufacturer is aware of similar systemic restart failures across its V6 engine platforms, which are currently the subject of active NHTSA investigations and class-action litigation. However, this issue continues to persist on the newest model years, creating an active road safety risk.

NHTSA ID

11774033

Incident

May 1, 2025

The vehicle's Auto Idle Stop (AIS) system engaged normally when coming to a complete stop at an intersection, shutting off the engine to save fuel. However, when attempting go through the intersection after the light changed to green, the engine failed to restart automatically. The vehicle completely lost power in an active lane of traffic, creating a safety hazard. The vehicle had to be shifted into park and manually restarted to clear the roadway. This failure appears directly related to NHTSA Engineering Analysis EA25004 regarding Honda/Acura Auto Idle Stop restart failures.

NHTSA ID

11773974

Incident

Sep 18, 2026

We have been experiencing issues with the car stalling while driving. Most recently, the car lost power a few feet into making an unprotected left turn leaving us stranded in the middle of an intersection in a vulnerable position for several minutes. This was deeply unsettling to have happen while making left turn maneuver. It seems to be a failure of the Auto Start/Stop function. After a few persistent trips to the dealer, they have now informed us that this is a known issue, but the parts are on backorder until January 2027. The workaround is turning off the Auto Start/Stop function, but this button does not have an indicator light, is not always confirmed on-screen, and is re-enabled by default EVERY time the car is started. It also appears that others have complained about this issue, and this deserves to be upgraded to a recall. It is unacceptable that a manufacturer would know about an issue with serious safety implications and not notice owners. This could have easily caused a crash and it is happening to others. This specific van is used to transport a disabled family member and outside aides often drive him in this car. We do not feel comfortable with a non-persistent workaround while others are driving this car while we wait for this part. - Auto Start/Stop and Drivetrain, available for inspection - Car stalls during maneuvers after stopping - Problem was reproduced multiple times. Dealer is aware. - Inspected by dealer. - No warnings, messages, or symptoms.

NHTSA ID

11773727

Incident

Sep 14, 2026

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.

NHTSA ID

11773494

Incident

Oct 25, 2026

The vehicle idle start/stop feature has started struggling to reengage, particularly, it seems, in warmer weather. At least six times in the past two months (Sept-Oct 2026), the start fails completely during a drive. What this means is that the vehicle is stopped at a light and the start/stop kicks in. When I lift my foot off the brake to prepare to drive again, a warning flashes on (it disappears quickly but says something was detected) and the car shifts into park. I cannot put the vehicle into drive without turning off the car and turning it back on. This is very dangerous as I have been at the front of and in long lanes of traffic. Other drivers honk and try to go around me while I am getting the vehicle back up and running. The dealer has checked the car twice but cannot replicate the issue (both days they had the car, the temperature outside was below 80 degrees, and that seems to be a factor). Therefore, they cannot make or recommend any fixes other than turning off the feature everytime I turn on the vehicle.

NHTSA ID

11772407

Incident

Oct 13, 2026

There appears to be an issue with the automatic start-stop system. Occasionally, the engine will shut off at a stop light but fail to restart as expected. To get the vehicle running again, I have to turn the car off completely, wait a few seconds, and then start it back up.

NHTSA ID

11771547

Incident

Oct 10, 2026

On numerous occasions, the START/STOP idle system could not restart the engine. Happens often but not predictably.

NHTSA ID

11768696

Incident

Oct 2, 2026

My car has stalled numerous times when it stops, and the engine goes into the fuel saving off mode. It stalls when I try to drive away as my foot comes off the brake. This has happened more times than I can count. In addition, as a side not I rented another 2025 Honda odyssey, and it also died when trying to go. The dealer has supposedly driven my vehicle when we bring it in but never has reproduced it according to them. They did admit that they knew about it but had no solution at present. There only response was to say to turn the engine shut off switch to disable it. There are warning lights after it dies but not before.

NHTSA ID

11768551

Incident

Sep 8, 2026

9/22/2026- the car idle stop failed to restart at a intersection. 9/23/2026- the car did not start after stopping to get gas. I have not taken it to the dealer yet. Will do it as soon as I get a chance. When the idle stop fails the car shift into parking and only the accessories are on.

NHTSA ID

11766569

Incident

Sep 22, 2026

The transmission has been having issues since it had 10 miles on it, it locks at certain speeds and wont go higher than 35, it misfires at lights, it will randomly make clunking sounds when driving and you can feel the vehicle throw you forward, ive taken it in multiple times, we have multiple cases open with Honda and they will not respond but it doesnt give any lights so dealership says they cant do anything even though theyve said they have felt it

NHTSA ID

11764272

Incident

Sep 14, 2026

The van got stuck in park after backing out of a parking lot. Changed to drive but gear shift back to park. Have to restarted the car twice. People were honking nonstop. This is not safe.

NHTSA ID

11764254

Incident

Sep 14, 2026

The contact owns a 2025 Honda Odyssey. The contact stated that while coming to a complete stop at a red light or a stop sign, the vehicle stalled and shut off unintendedly. There was no warning light. The vehicle was restarted. The manufacturer was notified of the failure and stated that there was an ongoing investigation associated with the failure. The vehicle was not repaired.

NHTSA ID

11763725

Incident

Sep 11, 2026

The vehicle experienced multiple sudden engine stalls while driving in traffic. Specifically, the engine shut off unexpectedly and the transmission automatically shifted into Park (P) while on the road, leaving the vehicle immobilized and unable to be manually shifted out of P. Restarting the vehicle was extremely difficult, which created a severe safety hazard and nearly caused a rear-end collision. The vehicle was inspected and confirmed by an authorized Honda dealer that the starter failed. The starter has since been replaced. The failed component is available for inspection upon request.

NHTSA ID

11761926

Incident

Aug 20, 2026

For several weeks, my 2025 Honda Odyssey, with approximately 30,000 miles, had been jerking while being driven. An independent mechanic believed the problem might be transmission-related. I brought the vehicle to an authorized Honda dealership, reported the jerking and specifically stated that I suspected a transmission problem. The dealership recommended and performed a transmission-fluid service. On August 24, 2026, at approximately 4:00 p.m., my wife was driving on the New Jersey Turnpike with our children when the vehicle suddenly jerked and behaved as though the transmission was attempting to engage reverse while the vehicle was moving forward. This created an immediate loss of predictable vehicle control and nearly caused an accident. My wife managed to pull into a parking lot. The vehicle then would not move in reverse and displayed a transmission-system warning. The vehicle was returned to the authorized Honda dealership. The dealership subsequently determined that the transmission required replacement, and it is currently being replaced under warranty. No collision or physical injury occurred, but this sudden transmission malfunction placed my wife, our children and other motorists at serious risk. The vehicle is currently at the dealership, and the failed transmission may be available through the dealer or manufacturer. I am requesting that NHTSA investigate whether this is a safety defect affecting the transmission or powertrain in the 2025 Honda Odyssey.

NHTSA ID

11761184

Incident

Aug 24, 2026

Engine failed to restart after turning off at idle at a stop. When releasing the brake the engine tried to turn on but stalled out. It is available for inspection upon request. No major safety concern, traffic behind the vehicle was prohibited from moving until the vehicle could be restarted. The failure has not been reproduced by a dealer or service center, or inspected by anyone else. There were no warning lights but after the failure a message displayed saying “To continue to drive, depress brake pedal and push switch”. The failure first appeared after 10,000 miles and occurred between 5-10 times since then.

NHTSA ID

11760646

Incident

Apr 1, 2026

My van will stall at red-lights. It started three weeks ago. The car is a year and a half old. The auto- idle stop system is activated. We stop at a red light. Car stops. When we go to start car dings and thankfully has started 3 times. This time, the car made a ding and did not re-start. I was stuck at a now green light and couldn't move. The dash flashed hit the brake to re-start. I did numerous times. I couldn't get the car to switch to park or drive. I tried switching the car on and off and couldn't get it restarted. I was disabled for about 2 minutes before it kicked back on. My kids were in the car and this scared me.

NHTSA ID

11760051

Incident

Aug 27, 2026

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 ID

11757634

Incident

Jun 17, 2026

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 ID

11757543

Incident

Aug 17, 2026

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 ID

11757358

Incident

Aug 16, 2026

After driving for awhile, stopped in a store for a minute and came out and my van barely started. Made my next stop a minute down the road, and when I came out the car wouldnt turn over. Let it sit for a minute and still heard the start click once and nothing. Let it sit for 10 15 mins then tried to start it and it worked. Had battery and alternator tested at Auto Parts store and both ok. After reading some forums and researching, I see that it is an overdraw from the auto start feature. I also saw the model of starters on my year of van were only used one year, so it seems like its a problem Honda has known about. Im seeing a lot of these issues, and the guy at the auto parts store even knows about it, so it is something that needs a recall. Clearly these starters are a problem. My van just rolled over 36k miles because we drive a lot so its not under warranty still.

NHTSA ID

11754886

Incident

Aug 4, 2026

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 ID

11754469

Incident

Jul 30, 2026

With idle start/stop enabled, there have been multiple occasions where the system has not restarted, causing my wife to almost get into an accident with my two young daughters in the car. Honda has looked at it on two occasions and claims there is no issue. However when researching this online, it has let me to find a NHTSA investigation, as well as hundreds of complaints about this are found online.

NHTSA ID

11752447

Incident

Oct 10, 2025

The contact owns a 2025 Honda Odyssey. The contact stated that while depressing the brake pedal and stopping at a traffic light, the gear shifter independently shifted to park(P). The vehicle was turned off and restarted, and the vehicle then operated as intended. A dealer was contacted. The vehicle was taken to the dealer to be diagnosed; however, the diagnostic result was unknown. The vehicle was not repaired. The insurance company had not been contacted. The manufacturer was made aware of the failure and opened a case. The failure mileage was 26,000.

NHTSA ID

11751646

Incident

Jun 15, 2026

Mileage

26,000 mi

Once the vehicle's auto idle stop system engaged at a traffic light, and the engine failed to restart automatically leaving us stranded in active traffic. We usually disable the system but forgot that time. It has also required multiple manual push-button attempts to start from a parked position at home and in public parking lots. The vehicle was brought to an authorized Honda dealership for this issue. The dealer stated they could not replicate the symptom, diagnosed it as a low battery, and charged the battery. The issue persists. Failing to restart at a traffic light creates an immediate rear-end collision hazard and leaves occupants vulnerable in the middle of active intersections.

NHTSA ID

11748227

Incident

May 7, 2026