2025 Honda Odyssey: start-stop system problems

Filed Nov 5, 2026 · Engine · CA

The 2025 Honda Odyssey I purchased has issues where the car will not start after the "Automatic Start/Stop" feature turns on. What that looks like is when I stopped on the freeway in rush hour traffic, or at a long traffic signal (usually with many, many people behind me on a busy road), my car will stall and not turn on. I have to wait, sometimes minutes, for my car to restart. This is a safety issue because it will stall / I will have to restart at very inappropriate times, like in rush hour traffic on the freeway. It has happened multiple times. No warning lights or messages came on, other than when the car had officially stalled. By that point, there is nothing I can do besides wait for a minute or so and restart car.

Filed Oct 30, 2026 · Engine · 20,000 miles · ME

The contact owns a 2025 Honda Odyssey. The contact stated that while at a complete stop, the Auto START/STOP feature failed to restart the engine after releasing the brake pedal. The contact shifted to the park(P) and opened and closed the front driver’s side door to restart the vehicle. Additionally, during the failure the message "Check Rear Seat" was displayed. The cause of the failure was not yet determined. The local dealer was notified of the failure, and a service appointment was scheduled. The contact was notified of the federal safety agency Action Number: EA25004 (ENGINE AND ENGINE COOLING). The contact stated that the vehicle had experienced the failure listed in the investigation. The failure mileage was 20,000.

Filed Oct 26, 2026 · Electrical, Engine · UT

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.

Filed Oct 25, 2026 · Engine · MO

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

Filed Oct 19, 2026 · Electrical · NE

When starting the car it takes a long time to officially start. This could leave me stranded. A Honda dealer has confirmed this is an ongoing issue as well as other car shops. It started to appear a few weeks ago. I have video I can send. The auto start stop system has shut the vehicle off in the middle of an intersection which could cause an accident or me being stranded.

Filed Oct 19, 2026 · Electrical, Engine · FL

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

Filed Oct 16, 2026 · Electrical, Engine · VA

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.

Filed Oct 16, 2026 · AL

The stop-start system that is supposed to idle at lights and when stopped causes the system to completely shut off. This is incredibly dangerous as I have to completely shut the car off and back on. It also eats at the battery so sometimes I have to 'start' multiple times before the engine turns over and actually starts.

Filed Oct 15, 2026 · FL

The auto stop start system semi regularly stalls in the middle of traffic, shutting the van down. This requires a quick power off and restart that doesn't always succeed on the first attempt. This creates a risk of an accident, especially during busy traffic times. The dealer just told us that if it will start up eventually then the starter isn't bad, so there's nothing they can do. This is a known issue amongst Odyssey owners. The vehicle has only been inspected by the dealership. They don't acknowledge the problem, which is why I'm reporting it here. This is a common issue and nobody is doing anything about it. No warning signs. This has been occurring for several months, intermittently.

Filed Oct 13, 2026 · Electrical, Engine · VA

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.

Filed Oct 12, 2026 · Electrical, Engine · PA

Vehicle auto start/stop was turned on. Vehicle stopped at a red light, vehicle engine shut off. Upon releasing the brake pedal, vehicle engine failed to start, a series of warnings and messages flashed on the dashboard, then vehicle transmission slammed into Park, from Drive. Driver proceeded to turn the vehicle off entirely, and was able to successfully restart the vehicle and drive away. Dashcam video, which captured audio and video through windshield but not dashboard, available upon request (file size too large to submit via this form).

Filed Oct 11, 2026 · Engine · NJ

Vehicle is equipped with automatic engine idle-stop (auto stop/start). On multiple occasions, when the system shuts the engine off at a stoplight or in stopped traffic, the engine fails to restart automatically when the brake pedal is released. The vehicle is left immobilized in an active traffic lane. Restarting requires shifting to park and pressing the ignition button, and even then the restart is delayed, leaving the vehicle stranded in the intersection with cross traffic approaching. This has happened repeatedly and creates a serious safety risk: a vehicle that cannot move out of an intersection can be struck by cross traffic, and occupants, including children, are exposed. No crash, fire, or injury has occurred. There were no warning lamps or messages before the failures. The component is available for inspection upon request. The vehicle has not yet been inspected by a dealer or the manufacturer for this issue. the federal safety agency is already investigating this exact failure mode in this vehicle population (engineering analysis EA25004, failure to restart after auto idle-stop).