2025 Honda Odyssey

There is an idle function on the engine that shuts the engine off when at rest, the engine has failed to restart and the car dies in the middle of the street, without warning, as if the battery is dead. The handful of times this has happened the car has been able to start back up within two or three tries. Honda acknowledges the issue as far as I know. The dealership let me know this is a known issue. It is unacceptable that there is no fix to this problem.

Stopped in heavy traffic in a four lane highway. Auto start/stop shut the engine down as expected. Traffic ahead cleared. I took my foot off of the brake to step on the gas. The engine didn't start up, and the radio and all lights inside went blank. Traffic behind me approached at about 45 mph. and were swerving around to avoid hitting my dead vehicle from the rear. I pushed the start button. Nothing. Again. Nothing. Several times more with my foot on the brake, or off the brake. Nothing. I put it in park and kept trying the start button. Finally it started, the radio and dash display came on, and from then on it operated as usual. Scared the hell out of us. There was no warning that anything in the car was malfunctioning before this happened. Took it to the dealer. They looked it over, kept it overnight. Told me the next day that the battery can get drained too much if the air/cond is on max and the start/stop feature doesn't like that. They used a machine to drain the battery and recharge it and they tell me now that it should be good. I don't believe one has to be aware not to use the air on max while the start/stop is enabled. I'm afraid to drive the car now! Our lives were in danger.

The vehicle suffers from an intermittent electrical/charging and starting system failure tied to the Auto Idle-Stop feature. While driving and coming to a stop at active traffic lights, the engine stutters and completely shuts down. It then fails to automatically restart, requiring multiple manual attempts to crank the engine back over. This creates a severe safety hazard, leaving my family suddenly stranded and vulnerable to being rear-ended in live traffic. The vehicle also intermittently struggles or takes multiple attempts to start after being parked in lots. ​The issue has been brought to two separate authorized Honda dealerships within a 30-day window. The first dealership diagnosed a failed battery and replaced it under warranty, but the stalling recurred. The second dealership held the vehicle for five days for diagnostic testing but stated they could not replicate the defect, returning it with no repairs made. Immediately upon picking the vehicle up from the second dealer, it suffered another starting failure in a parking lot. No warning lamps or error messages appeared on the dashboard prior to these failures. The components are intact on the vehicle and available for inspection upon request.

1st concern- while in an intersection the van powered off after lights on dashboard said something about a system failure. I tried restarting vehicle several times as I was really nervous being in an intersection and it finally started after a few tries. This same thing happened l, to my husband, while parked in our garage about to leave. 2 nd concern- last week on XXXI drove to [XXX] for a short vacation and while at a stop the dashboard had multiple warnings going off 1) electrical power steering system problem 2) Hill start assist problem. Vehicle may roll upon brake release 3) adaptive cruise control problem 4);power steering system problem. I called Roadside assistance and we waited about an hour and a half. He used a tester and said all was coming back fine but to take van to a dealer the next day. We took it to Egg Harbor Honda dealership and they said if the codes have cleared, which they had, then there is nothing they can do and to just take it to our dealer when we return home. I have an appointment for tomorrow at XXX at 915 am at [XXX] of Honda in Abington, PA. I have pictures of all the "2nd concern" warnings. During the 1st concern I was driving and did not feel comfortable capturing the warning lights with my phone camera. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

When stopped at a stop light, the car went into idle stop. Upon taking my foot off the brake to accelerate, the car stalled and required me to push the brake and ignition button to shut it off completely and then restart the car. This has happened on 8 separate occasions. It seems to happen more frequently when we have the AC on on a hot day. It's scary to be at a light with cars waiting to go around you sometimes in the middle of a busy road and your car just stops. I feel anxious when driving on the highway that the car will just stop, though I think that is unlikely given how this happens. We have gotten into the habit of turning off the automatic idle stop feature when we drive and that gets around it, but you have to shut this off every time you start the car, so we forget sometimes. No warning lights before the failures occur nor after. We are going to visit the dealership, but this is a known issue that is already under investigation and so I am just adding our report to the pile of others as additional evidence.

On multiple occasions, after the engine auto start/stop has turned the engine off at a stop, the engine fails to restart. This leaves the car stalled in the roadway. This has led to multiple unsafe situations as traffic flow is disrupted must divert around the stalled car in the middle of the roadway. There have been no other warning signs or symptoms leading up to this issue. The vehicle has not yet been inspected, a inspection at a Honda service center is scheduled for next week

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.

The malfunction involves the Auto Idle Stop / Auto Start-Stop restart system on my 2025 Honda Odyssey, including related battery, charging, starter, starter relay, brake switch, and Power Distribution Module components. The vehicle is available for inspection upon request. The vehicle has shut off while stopped in traffic, usually at a red light, and failed to restart normally. This has happened four separate times. This puts my safety and the safety of others at risk because the vehicle can become disabled in an active traffic lane or intersection, creating a rear-end collision hazard and blocking traffic. I took the vehicle to Hill Country Honda in San Antonio, Texas. I told the dealership the vehicle had stopped and failed to restart normally multiple times, and I provided video and pictures to the service advisor. The dealership stated the battery had run down because of the Auto Idle Stop system and charged the battery for approximately two hours. I was also told that if it happens again, the procedure may be to charge the battery again before moving forward with further diagnosis or repair. As far as I know, the dealer has not reproduced the failure while in possession of the vehicle. However, they were made aware of the repeated failures and reviewed the video/pictures I provided. I do not know whether American Honda has inspected the vehicle. It has not been inspected by police or insurance representatives. Warning messages appeared during the failure, including “System problem detected. Shift to Park” and “To continue to drive, depress brake pedal and push switch.” These appeared when the Auto Idle Stop system had shut the engine off and the vehicle did not restart normally. I had no clear warning before the first incident.

I was waiting at a stop light. The idle system kicked and the vehicle turned off, as expected. Upon lifting my foot off the brake, the vehicle failed to start and the car went into park. I was unable to restart the car after holding the brake pedal down and pressing the start button multiple times. After many failed attempts, I shut off the power to the vehicle, waited a min or so and restarted the vehicle. I then put the car in drive and continued thru the intersection. This was in a busy intersection and could have easily caused an accident, but thankfully it did not. This is the 3 time this has occurred with this vehicle.