2025 Honda Odyssey engine problems

ENGINE

The vehicle experiences a sudden and complete engine stall while at a complete stop in traffic (such as a red light) due to a failure of the Auto Idle Stop (AIS) system. The engine shuts down smoothly as intended by the fuel-saving feature, but fails to restart when the brake pedal is released or the accelerator is pressed. The vehicle drops into a total shutdown state, requiring the driver to fully shift into Park, switch the ignition completely off, and manually press the Start button to restart the engine. No warning lights, error codes, or dashboard messages appear before, during, or after the failure. This creates a severe safety hazard by leaving the vehicle unexpectedly stranded and unresponsive in active intersections.

NHTSA complaint #11764114 — an unverified report by a vehicle owner.

ENGINE

The Auto Idle Stop system intermittently fails to restart the engine after the system shuts the engine off while the vehicle is stopped. When this happens, the vehicle remains disabled and I have to completely restart the vehicle before I can continue driving. This has happened twice while stopped in highway traffic. On both occasions, traffic began moving while my vehicle failed to restart, creating an immediate crash risk and nearly resulting in collisions from vehicles behind me. The problem is intermittent. The vehicle has previously been brought to a Honda dealership for this concern, but the failure continues. I have contacted the dealership again and have also contacted the manufacturer regarding the issue. There were no consistent warning signs before the failure. The problem occurs after the Auto Idle Stop system activates. Because the vehicle may fail to restart unexpectedly in active traffic, I am concerned that the condition presents a serious safety risk to the occupants of the vehicle and surrounding motorists. The vehicle is available for inspection upon request. This condition appears consistent with NHTSA Engineering Analysis EA25-004 involving Auto Idle Stop no-restart complaints on Honda Odyssey vehicles.

NHTSA complaint #11764217 — an unverified report by a vehicle owner.

ENGINE

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 complaint #11764254 — an unverified report by a vehicle owner.

ENGINE

My 2025 Odyssey stalls. The engine will turn off when I am stopped and will take at least 2 retries to get the engine to turn over. Once I was at a stop light on an interstate off ramp when it stalled. Once I was at a stop sign when it stalled. Twice I have been unable to start it at a store. I will settle the brake & push the start button & nothing will happen. I will try again. I have to take my foot fully off the brake, wait a few seconds, & try the steps again. It eventually starts, but I'm afraid that someone will hit me and hurt my children or myself as I'm a sitting duck.

NHTSA complaint #11763874 — an unverified report by a vehicle owner.

ENGINE

My vehicle has failed to restart numerous times at stoplights with the auto start engaged. It also failed once when it was disengaged. It also stalls to start on initial start quite often. Even when it is disengaged, upon stopping my vehicle makes a type of quiver in the engine that sounds like a stall or like it is about to cut off. It usually evens out after 5-10 seconds. I had people drive around me, in heavy traffic, after a major fail at a red light. I had an aggressive drive pass around me quickly at another incident at a smaller redlight intersection. I have had it cut off, with my family, over 50mls away from home. A dealership replaced my battery that was under warranty. I was told there were no other issues and to keep my auto start disengaged while driving. I'm not sure that is my safest option at this point. I am extremely concerned it will happen at an intersection and I will roll into traffic with my family.

NHTSA complaint #11763899 — an unverified report by a vehicle owner.

ENGINE

The idle restart function causes the van to shut off completely when at stop lights in heavy traffic. It does not immediately restart and we have to sit in traffic while folk are honking at us to go. It doesn’t do this every time, but has happened 3 times in the last 3 months.

NHTSA complaint #11763323 — an unverified report by a vehicle owner.

ENGINE

The auto idle system shuts off the vehicle completely at a stoplight or intersection and fails to restart when you release the brake. The vehicle is stuck in traffic and doesn’t restart for a few minutes mine had to be jumped started this THIRD time it happened. This created a hazardous safety condition for my family in which kids are always traveling. The dealer has not provided solution. Concerned this can cause a fatality because I can get rear ended.

NHTSA complaint #11763214 — an unverified report by a vehicle owner.

ENGINE

Auto Idle Stop malfunction-- it happened twice during my travel (1)[XXX] , around 7pm. The car stalled and failed to restart at a local street of Hasbrouck Heights, NJ after signal turned green; (2) [XXX] around noon. The same problem happened at a [XXX] of Goshen, NY when a semi track was behind me. I reported to NHTSA immediately after the 2nd incident, but I cannot find a confirmation number before going to my dealer, so I re-file the complaint. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11762534 — an unverified report by a vehicle owner.

ENGINE

The idle stop function failed to restart the vehicle while in traffic at a red light. The vehicle was in traffic on a state highway and was unable to restart without shutting the vehicle off and on again. The problem has happened frequently the past few weeks to where I was able to reproduce and record the incident. The battery light appeared before shutting off the car with the push button on/off.

NHTSA complaint #11762569 — an unverified report by a vehicle owner.

ENGINE

Engine failed to restart after AutoStop function engaged at a red light. We were stranded and had to manually restart the car, which took long enough to figure out that we were stranded in traffic for a bit.

NHTSA complaint #11762344 — an unverified report by a vehicle owner.

ENGINE

I am experiencing a serious and recurring safety issue involving the engine unexpectedly completely shutting off while the vehicle is being driven and separately, the engine intermittently failing to start after the vehicle has been parked. 1.The engine unexpectedly and spontaneously shuts off when the vehicle is stopped or slowing down, including at stop signs, traffic lights, and during traffic slowdowns. These events occur without warning or notice, and the vehicle does not reliably restart immediately. In nearly all instances, the engine has failed to restart for several minutes despite multiple attempts. This creates an extremely dangerous situation. When the engine shuts off unexpectedly in traffic, I am concerned that drivers behind me will not realize that my vehicle is experiencing a malfunction and may collide with my vehicle before I am able to restart it and safely move. These incidents cause me significant fear and stress each time they occur. I am not certain whether the vehicle’s Auto Start/Stop system is involved in these incidents or whether another component or system is malfunctioning. I am requesting that Honda and the dealership fully diagnose the cause rather than assuming that the behavior is normal operation of the Auto Start/Stop system. 2.Separately from the engine shutting off while driving, the vehicle also randomly and spontaneously fails to start after it has been parked. I have documented some of these incidents by video, including instances in which the engine failed to start. in which the engine failed to start despite multiple attempts. 3. As soon as these problems began, I took the vehicle to the service department of the dealership where I purchased it. At this point, the repeated engine shut-off and failure-to-restart conditions remain unresolved. I am requesting a thorough investigation and requesting that Honda identify the underlying cause of these failures and provide a permanent solution as soon as possible.

NHTSA complaint #11762365 — an unverified report by a vehicle owner.

ENGINE

Vehicle restarted itself at a traffic stop to.  Vehicle stalled at another traffic stop.  Both occurred on the same single day drive.

NHTSA complaint #11762236 — an unverified report by a vehicle owner.

ENGINE

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 complaint #11761926 — an unverified report by a vehicle owner.

ENGINE

Vehicle stalls at stop lights when the air conditioner is on when idle stop is engaged.

NHTSA complaint #11762029 — an unverified report by a vehicle owner.

ENGINE

The Auto Idle-Stop system is causing the vehicle to stall at stop signs, requiring a full shift into Park, engine turnoff and turn to restart to get moving again. This has happened two times in four days

NHTSA complaint #11760933 — an unverified report by a vehicle owner.

ENGINE

2025 Honda Odyssey Elite. Approximately 12,000 miles. Vehicle has experienced 4–5 instances where Auto Idle Stop engages while stopped and the engine fails to restart. Vehicle cannot immediately be restarted with the push-button ignition and must be completely shut down before it will restart. Battery was replaced by Honda, but the condition is ongoing. Vehicle can and has become disabled at an intersections and traffic lights creating a potential collision hazard.

NHTSA complaint #11760614 — an unverified report by a vehicle owner.

ENGINE

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 complaint #11760646 — an unverified report by a vehicle owner.

ENGINE

Vehicle was using an off ramp and shutdown in the middle of a lane. It was 10:00pm and all systems were shutdown, including lights. Vehicle refused to restart and could not be placed in neutral, the vehicle could not be removed from the interstate off ramp. This issue has been brought to the attention of Honda, the started assembly was replaced on March 5, 2026. This vehicle has been delivered to Honda for similar electrical/starter issues 4 times since October 27, 2025. The first report was filed with Honda on October 27, 2025 with all lights on dashboard lit when vehicle was active. Had to wait until a tow truck arrived before vehicle could be safely removed from the scene.

NHTSA complaint #11760209 — an unverified report by a vehicle owner.

ENGINE

My 2025 Honda Odyssey shut off in Auto Idle Stop while at a busy intersection. The car was unresponsive and would not engage the motor. After five minutes of trying to turn the car off and on, it eventually restarted and the motor came back to life. This issue put me at great risk of bodily harm. Given the fact the car was unresponsive in such a surprising way, I was very lucky not to have cars crash into me from behind as they few by for the 5 minutes I was stranded. This is the first instance and has not been reproduced as I am too worried to drive the car now. No inspection of the vehicle has been completed as this incident just occurred. No waring light prior to the incident, but the battery warring light did come on while the car shut off and unresponsive.

NHTSA complaint #11760381 — an unverified report by a vehicle owner.

ENGINE

Engine fails to restart after auto off.

NHTSA complaint #11760047 — an unverified report by a vehicle owner.

ENGINE

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 complaint #11760051 — an unverified report by a vehicle owner.

ENGINE

Our 2025 Honda Odyssey Touring has repeatedly stalled or nearly stalled while driving. Of at least three dealer visits, the stalling issue was first formally documented on XXX, when we reported the engine shutting off twice while driving and the brake warning light activating twice. DTC 15477 ("failing starter") was recorded, and the starter was replaced. XXX, my [XXX] daughter was driving alone when the van lost power at a red light and would not respond to the accelerator once the light turned green. She was unable to shift gears or shut off the engine, and the van remained unresponsive in live traffic for several minutes before power returned on its own. A bystander helped restart the vehicle and move it to safety. I believe this defect is the subject of open NHTSA Engineering Analysis EA25004 (opened XXX), covering 2018–2025 Odyssey and related Honda/Acura models for Auto Idle Stop failing to restart after a stop. On XXX, the dealer confirmed the software was current, the battery was healthy, and replaced both relays, completing every step of Honda's documented repair bulletin. Hours later, on the drive home at 27,942 miles, the van stalled again at a stoplight. The dashboard instructed the driver to depress the brake and press the switch to continue driving. The driver powered the vehicle off and restarted it to regain control. Video of this incident: [XXX]. Dates of incidents: XXX – Two engine shut-off events and two brake warning light events reported; starter replaced. XXX – Daughter's incident described above. XXX – Software, battery, and relays completed per repair bulletin; vehicle stalled again the same day at 27,942 miles. Repair history: Full documented scheduled maintenance and bulletin remedy applied (starter, software, battery, relays) across three or more visits; vehicle stalled again hours after the final step was completed. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11760174 — an unverified report by a vehicle owner.

ENGINE

I am filing a safety complaint regarding a recurring, severe defect involving the 2025 Honda Odyssey's starter motor and the factory-installed Auto Idle-Stop (idle-stop) system.While driving, the vehicle's Auto Idle-Stop system engaged as designed when coming to a complete stop in traffic. However, when trying to accelerate, the vehicle failed to restart automatically. The engine completely stalled out on an active roadway. Attempts to manually override the system and restart the vehicle using the ignition button failed completely, resulting in an immediate and dangerous loss of propulsion.This defect presents a severe and immediate traffic hazard, as it unexpectedly leaves the vehicle completely disabled and stranded in active lanes of traffic. It strips the driver of the ability to clear the roadway to safety, significantly increasing the risk of a rear-end collision. Multiple occupants, including passengers in the rear seats, were exposed to extreme danger due to this sudden propulsion failure.Despite bringing the vehicle to an authorized Honda dealership, the manufacturer has failed to provide a permanent safety remedy. Also Honda corporate has deny warranty replacement for the starter that’s causing the issue.

NHTSA complaint #11759780 — an unverified report by a vehicle owner.

ENGINE

Starter failure due to heat. Vehicle has failed to restart several times while stopped in traffic and at a traffic light due to the Auto Idle Stop function.

NHTSA complaint #11759886 — an unverified report by a vehicle owner.

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.