2020 Honda Odyssey ELECTRICAL SYSTEM,ENGINE

Auto Idle Stop (AIS) system. had many of the other same symptoms that people reported. our car would go into idle mode and then it would not restart. I would have to turn the car off I tried to do various things just to get it started again. this happened one time was the exited the highway and also happened coming out of a car wash location. I took it to Honda and they said because of the idle stop functionality the starter went bad and they had to replace that. I was compensated some money from Honda but I believe I was only done so because they knew something was wrong and I really believe there should be a recall for this. it is completely unsafe and very scary when it happens especially in the middle of traffic. our starter was replaced because of this issue on November 5th 2024, but the symptoms had been going on for that whole calendar year prior

I was stopped at a light at a busy intersection and when I went to drive when the light turned green, my van did nothing. It had turned off the engine when I stopped at the intersection. I tried to switch gears and it wouldn’t change. I was kind of panicking because I was holding up a ton of traffic and my toddler was in the backseat so I can’t remember exactly what was happening on my dash. I would turn the car on and off but I could not get it back into drive as the engine would not restart, but all of the electronics were still working. Finally someone offered to jump the car with one of those portable battery jumpers and that worked. I drove straight to Autozone to see if it was something their machines would pick up on but they couldn’t find anything wrong. The dealer also couldn’t find anything wrong. I believe this is related to the auto idle stop feature.

My 2020 Honda Odyssey died at a stop light while driving on 5/12/2023. The auto on/off feature caused the van to turn off at a stop light and then there was not enough power in the battery to start the car again. It had to be towed to the Honda dealership where they could not diagnose the issue. They said the alternator was fine and the battery charged up fine. So no root cause found. Then 6/26/2023 - I drove the van for an hour to the airport and back, parked it in the garage (engine off) for about 10 minutes, and the van struggled to start but did on the second attempt. Then on 7/7/2023 - my wife took the van to the store, came back home and parked it in the garage with the engine off. She came back 5 minutes later to leave again and the van wouldn’t start. The battery was drained. Now it’s sitting on a trickle charger just so I can take it into the dealer. On 7/10/23 - I had the battery replaced and the Dealer did some sort of warranty work to help and that corrected the issue. UNTIL it died again On 11/27/23, I had to get yet again another battery as the same issues began happening and it was deemed a “bad battery”. Throughout 2024 and now into 2025 I continually have the same issues where the vehicle will stutter but still managed to kick back on after an auto shutoff. I have been to the dealer countless times and they continually tell me there isn’t anything wrong. Something is happening that causes this - whether is an electrical parasitic drain or something else. I have heard that other vehicles this has happened to but Honda claims nothing. I also had a case opened with Honda on this that never went anywhere - Case #13952151 There is clearly something wrong and not being able to diagnose it is even more frustrating given the issue. If it drains while driving - I CANNOT DO ANYTHING. I can’t even put it in Neutral to move it manually because everything is electronic!!

I am filing this complaint regarding a serious safety defect that persists in my Honda vehicle following Honda's PGM-FI Idle Stop software update. Recently, I experienced a dangerous incident on [XXX] outside Washington, DC. My vehicle completely stalled in heavy traffic, leaving me unable to start my car on the highway. The vehicle would not restart for approximately one minute, creating a significant safety hazard as traffic moved around me. Of particular concern was that during this incident it is not clear whether or not the airbag system would deploy since the car was off. This is a major safety issue and, reviewing complaints online, I am not the only customer to experience this, despite having received the software update. This is not an isolated incident. The vehicle's auto start-stop feature continues to malfunction, repeatedly shutting down when it goes into idle. This issue is also causing significant battery drain, making the vehicle increasingly unreliable and unsafe to operate. Worse, Honda indicates that this feature can act up when the battery is low, but the feature itself drains the battery. You can turn the feature off every time you get in the car, but this is not a fix. I have been informed by Honda there is no way to permanently disable the feature. I strongly urge NHTSA to investigate this matter. The current recall repair has proven insufficient to resolve the safety defect, and the malfunction creates unacceptable risks for me and my family. This issue requires immediate attention to prevent potential accidents and ensure the safety of all road users. Please require Honda to implement a repair that allows consumers to permanently disable this feature. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

It happened twice this month already. Once while driving, the car lost power (as if engine was never turned on), and the gear changed to N so I tried to slow down, then the power came back on, and then I was able to shift to D and continue my trip. Second one happened this morning. It was on auto-shutting idle position and when I put my foot on the accelerator, it completely lost power again (I recently changed the battery and tested in the afternoon and all working properly).

The contact owns a 2020 Honda Odyssey. The contact stated while stopped at a traffic signal he was depressing the brake pedal to stop the vehicle, when the signal changed, and as he released the brake pedal, the vehicle was not turning on. The contact placed the vehicle in park (P) and restarted the engine. The contact stated that his vehicle is equipped with the Engine Off-On feature. The contact stated that the Off-On was also hesitating before he needed to place the vehicle into the park to restart. The contact stated no warning light was illuminated. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that a software update needed to be performed. The vehicle was repaired. The contact manually turned the feature off to prevent the failure from recurring. The manufacturer was not informed of the failure. The failure mileage was approximately 51,000.

UNKNOWN. Auto engine idle stop was enabled when the vehicle was at a complete stop. Upon disengaging, the engine stalled and took a couple minutes to restart the vehicle. The vehicle was located in a highway that caused traffic delay and safety concerns. This has happened more than once.

On multiple occasions, after stopping the vehicle (for example at a red light), the engine would stop and not restart. After several minutes of frantically trying to restart the vehicle in dangerous situations (stopped in the middle of traffic and nearly rear ended multiple times), the vehicle would eventually start the engine. Bottom line - when stopping at a stop sign or red light, the vehicle turns off the engine and does not restart properly - placing all occupants in a dangerous situation.

The auto idle feature cuts out the engine in stop and go traffic and will not restart. This has happened on numerous occasions, creating unsafe conditions for traffic.

1)The back hatch will randomly close. The first time it happened I didn’t know what was going on and it hit me in the head. Today my kids were there and it almost hit them but I pushed them out of the way because I knew what was happening as it makes a certain noise first. 2)It stalls out randomly at red lights. 3) the doors won’t open or close at times. 4) the dvd player gets so hot it almost burns you and the dvd player won’t work. When I contact the dealer they say they can’t do anything since it happens randomly and it if doesn’t happen when it’s at the dealership they don’t know what to do so they don’t even make an appointment. Two years ago we complained that the door didn’t have a sensor because it shut my two year olds hand in the door. Honda acted like we were crazy. Then it became a recall and they ‘fixed’ them. But now they won’t open or close.

Auto shutoff feature regularly fails when attempting to restart the engine. It may delay the restart or put the car in park and not allow it to restart for over 30 seconds. I was stuck in stop and go rush hour traffic. The engine would not restart, leaving the car stranded in the center lane for over a minute while attempting to get the car to start and in drive.

Vehicle’s “Engine Idle Stop” feature malfunctions unless it is turned off manually. This is an energy conservation feature which turns off the engine when stopped. However, when lifting the brake, the engine does not turn back on at times, sometimes fully stalling the vehicle. At times, numerous lights have come onto the dashboard after this happens. At other times, the vehicle has completely turned off, leaving the safety of the driver and passengers at risk, particularly at stop lights, stop signs, and when in stop and go traffic. I’m continually worried someone is going to rear-end us when they see our brake light go off at an intersection. Vehicle has been brought to Honda dealership who stated they did not know the cause and replaced the battery. Problem was not solved and continues to happen.

Car was stopped in traffic and has a feature that shuts off the engine when stopped (in Drive but with brakes pressed). When trying to proceed forward car shuts down with numerous errors and does not start back up for 5 minutes. Cars are honking and having to drive around us. Eventually was able to get the car running and moved to a safe area. Errors car displayed included: blind spot info system problem and transmission problem

Vehicle driver side sliding door has issues closing. Mentioned to dealer, but dealer dismisses it as possibly from water residue after car washes. Door needs to be manually closed with pressure to latch. Vehicle has lost all electrical function while in Economy mode while in idle mode while at red lights and also while parked with accessories running. Vehicle batter life was verified and in excellent condition at battery replacement shop.

The “auto engine idle stop” system in my minivan is malfunctioning. This is a safety issue because the engine does not always restart when I take my foot off the brake. I am eventually going to be hit from behind by a driver behind me that assumes my minivan will accelerate from a stop when it is supposed to. Every time the malfunction occurs, the dashboard displays a message “Collision Mitigation System Problem”. However, I have been told by the dealership mechanics that this message is erroneous and that it is displaying because there isn’t a preset error message associated with the auto-engine idle stop malfunction. My minivan was 2 years old when I brought it to the dealership for repair the first time. That was in October-2021 and the dealership is Honda on Grand in Elmhurst, Illinois. I brought the vehicle to them on seven different occasions between October-2021 and now. Even though they were able to reproduce the problem, they say they don’t know how to fix it. So, they made minor repairs each time to different electrical and drive train systems in hopes that the malfunction will cease. After 10 months and 7 attempted repairs, my vehicle is still malfunctioning. The dealership instructed me to contact the corporate level Honda Customer Service Department, which I did on July 8, 2022. I was issued a case number and a customer service representative, Walter, to assist in resolving this problem. After many follow-up phone calls to them, they will not return my call to discuss my vehicle. I recently contacted the Elmhurst, IL dealership and spoke with the service manager, David Abraham, who said he would follow up with Walter. However, I still have not been contacted. I am very concerned for my safety and the safety of my two teenage children who are now driving my vehicle. This will undoubtedly lead to a collision if not repaired.