What 795 owners told NHTSA about the 2024 Honda Prologue EV

My vehicle constantly receives an error message while driving stating, "SERVICE HIGH VOLTAGE SYSTEM" and "REDUCED ACCELERATION DRIVE WITH CARE." Error symbols appear on the dashboard that show an orange turtle, a red battery with a big exclamation point through it and and a red car outline with a big exclamation point going through the middle of it. When this happens, the vehicle acceleration is significantly reduced and the regenerative braking or "one-pedal" feature automatically becomes disabled. If you're relying on that system to brake, it will not do so when you need it to and you have to manually press the brake to slow and stop the vehicle. This error clears after a few days of driving but never fails to return. The dealer said they found nothing wrong when I brought it in (when the error wasn't being displayed, of course) but it went back today with the error displayed so they could witness it for themselves. Separately, the vehicle makes an incredibly loud knocking noise when accelerating with the wheel turned. It appears this is coming from the CV joints.

NHTSA ODI 11726755

Loud clicking from both sides of the front CV joint. Dealer says there is nothing they can do but know of the problem. Says not to drive it as much.

NHTSA ODI 11726010

Broken/Clicking CV joints. This could lead to all loss of power transfer to the wheels, causing a sudden and unexpected stop to the vehicle while driving. Honda is aware of this defect, but has no permanent fix. This is confirmed by multiple Honda Service Centers. High Voltage Warning. Loss of heat, car will not charge, car shuts down/becomes undrivable, or enters "limp mode." This is an extreme safety issue. The car loses the ability to properly cool the main battery. This could result in thermal runaway (a rapid, uncontrollable, and self-sustaining increase in battery cell temperature), resulting in a fire that is difficult to extinguish, burns extremely hot, may reignite hours or days after the initial incident, and/or result in explosion. This is confirmed by multiple Honda Dealerships. The warning has occurred multiple times, even after multiple repair attempts.

NHTSA ODI 11721697

Clicking noises when turning. Dealership no longer fixing (fixed passenger side, driver side still unrepaired). Front end collision breaking happening at random, causing unsafe breaking in the middle of the road. Also frequently happening when releasing break at stop light, narrowly avoiding multiple rear end collisions due to breaks being slammed on by vehicle collision system. Now with high voltage battery failure message, blowing cold air out of hvac system and performing at reduced acceleration.

NHTSA ODI 11718298

Cv joints clicking when turning right or left. Dealer said it was normal. Battery not charging at superchargers after long distance travel on hwy.

NHTSA ODI 11717176

High voltage warning light, service vehicle soon light, reduced speed limit, would not charge past 25%, forward looking camera issues warning light would show up randomly Called the local Honda dealer(01/26/26), talked with service manager, He told me to bring the vehicle in immediately. The Honda dealer refused to fix it under warranty since it was in an accident.(Right fender and driver door needed repaired.) The dealer wanted $300 dollars to perform a diagnostic test on vehicle. Dealer found that the HVAC system had failed which also includes the 12 volt charging system to also fail. Dealer wanted an additional $800 for further diagnostic testing. Informed me that the full warranty was void do to it being in a previous accident and I will be responsible for all repairs for this vehicle. Contacted Honda headquarters and filed a complaint thru them. The car was towed to another dealer where they are working on it currently. No new updates as of 02/02/26

NHTSA ODI 11714966

Vehicle is unable to charge. Dealer inspection confirmed damage to the charging coupler/receptacle. Charging port shows burn marks and electrical damage. Dealer recommended replacement of the drive motor battery charger receptacle. Vehicle has no diagnostic trouble codes. No accidents, no misuse, no aftermarket equipment. Failure occurred during normal home charging. Honda dealer and Honda USA denied warranty coverage. This defect prevents vehicle operation and presents potential electrical and fire safety risk.

NHTSA ODI 11714338

Loud clicking and thumping noises from area of wheel drive axles. This predominantly occurs when the front wheels are turned off center. Clicking in axles and loud thumping in the chassis are enhanced with acceleration.

NHTSA ODI 11710356

High voltage system warning light came on dashboard, reduced acceleration occurred while driving today, 1/9/26. This is my second Vehicle Complaint form regarding High Voltage System failure. High Voltage Battery was replaced after first incident which occurred on 11/25/25, and car spent 37 days at dealership for diagnosis and high voltage battery replacement. Car is now back at dealership for diagnosis and possible 2nd high voltage battery replacement today, 1/9/26.

NHTSA ODI 11710033

Leased this car 1 year ago and it is currently in the repair shop for the 2nd time in a year for the same battery problem: battery won't charge and an error notice on the dashboard that says " Service high voltage system. Reduce acceleration. Drive with care". The first time the shop said that it was a software issue and fixed it. Now the shop is saying that the car needs a new battery. The error notice came up while I was on a road trip and I felt unsafe knowing that the battery could fail or combust while driving. Also, I did not feel safe having the reduced acceleration in effect while I was on the freeway where acceleration can be essential to match traffic and evade accidents.

NHTSA ODI 11709753

The “check high voltage system” warning came on, we noticed the hearing stopped. This started after 12,000 miles. The dealership said they fixed it and gave it back the warning reappeared a few days later, same events we lost heat and then the warning came back on. We have it back at the dealership they still don’t know what’s wrong.

NHTSA ODI 11707057

I have had multiple issues with this vehicle and it has been in the shop more than 80 days between April and Oct 2025. First, the entire battery system went out in the all electric vehicle. Honda said that since it was a collaboration car with GM, that it would take a long time to fix because their technicians weren’t very familiar. It took almost 8 weeks in the shop before we got it back. Not long after, the entire dash (electronics) went out and the shop had it again for over a week. they never found or could replicate the issue. The vehicle went back in after having multiple incidents of emergency braking when there was no emergency, or even vehicles in my vicinity. The final time this happened, I was traveling nearly 25 miles per hour and the car decided to slam on the brakes, making me feel like I hit a brick wall. My head slammed the steering wheel and my daughter was terrified. I drove it straight to the dealership and they said “what’s wrong with the car this time”…they had it for weeks, couldn’t replicate the issue and tell me it’s fine and to take it home. They suggest TURNING OFF THE SAFETY STSTEM AS A FIX, which seems criminal. The safety features should work properly. I shouldn’t be instructed to turn them off. I am very frustrated and have been working with Honda on a buy back out of good faith, but it’s been weeks and we have no answer. I am forced to drive a gas vehicle, costing me gas money now, when I bought an electric vehicle to avoid this cost. All around, it has cost me more money than it’s been worth and I’ve made multiple car payments as it’s sat at a dealership unusable. Again, it has spent more than 80 days in 6 months at the dealer with no resolution. My sound system blew out last time they had it checking out the braking issue so I waited another week to have that replaced, meanwhile the fix to the braking system was that I was told to turn the safety feature off. Insane

NHTSA ODI 11705185

Yesterday 11/30/25 we were going on the freeway about 60 mph, when suddenly I got the warning that my battery and acceleration were impacted due to a battery issue. States to service battery soon. It stayed that way as we were headed to have some blood work. That warning continued until the evening when it disappeared so thought it was a glitch. I still setup an appointment to have it checked at the dealership on Thursday 12/4/25 at 8:15am. On 12/1/25 at around 7:35am I was about to break at a light when I feel this jolt from my car and the same warning lights stayed on. I was really concerned so when I got off and went to work I immediately called the service department to move my appointment up to Tuesday 12/2/25 at 7am first thing. I dropped off the car at night for them to work on it. This seemed to impact also the Heater as it was cold air coming from my vents. I have seen this issue in Facebook and Reddit but felt I may not experience it as I had 8000+ miles on it with various long road trips. But now I am worried about the reliability and safety of this vehicle. Hope they can fix it and soon.

NHTSA ODI 11702390

Service high voltage error keeps coming on. Have had it serviced by the dealer multiple times. Seems to be a common error with all Honda prologues but Honda has yet to address the problem.

NHTSA ODI 11667582

Knocking sound in the front when turning Honda states normal axel problem. For Fuel/battery . Been in a back and forth with Honda service/Honda motors because I’m getting less then advertised on my range performance. Example I drove a 60 mile drive and car drained 109z that’s 49 miles unaccounted for. I am now being told by Honda Motors mediation that the battery loses 30/40 percent efficiency in cold weather. That’s horrible. It’s not advertised and it’s unacceptable. It’s unsafe that customers can’t depend on the vehicle when an emergency happens.

NHTSA ODI 11666428

Automatic braking is very sensitive, especially in the rain, and even more so when backing up in the rain. The unexpected braking happened to me at a rotary for no apparent reason, and numerous times in reverse. Service Vehicle Soon Light/(Propulsion System Failure) came on randomly at around 4000 miles. Within a day or so it turned off. Nothing with the car seemed to be effected. Then around 4500 symbol turned on again and has been on for a day or so. No notable issues.

NHTSA ODI 11662202

On April 19, 2025, the "Engine/Battery Fault" warning light illuminated on my vehicle. At the time, the car had only 1,398 miles on the odometer and had been purchased just one month prior. Shortly after the warning appeared, I received a diagnostic report from OnStar indicating fault code U362A. The vehicle exhibited significantly reduced acceleration and limited charging capability. Concerned about the issue, I brought the car to the dealership where I purchased it for inspection and service. The dealership performed a reset of the main computer system, which cleared the warning light. However, I remain concerned about the reliability of the vehicle. If this issue were to occur again—especially while driving in a remote area—I could be left stranded without the ability to drive or charge the car. While the problem has not resurfaced since the reset, I am worried it may return unexpectedly, affecting my confidence in taking the vehicle on longer trips.

NHTSA ODI 11661648

Vehicle with purchase on April 15, 2025 pre own with only 5800 miles. Drove the car for less than 2 weeks on April 28,2025 a vehicle warning pop-up “ high voltage service error” I took it back to Honda dealership. A code U3620 came up. The code indicated a high voltage battery replacement needed. Currently ETA for the parts is not available.

NHTSA ODI 11657935

three codes telling me there is a issue - reduce acceleration drive with care - service vehicle soon - service high voltage system

NHTSA ODI 11655763

I leased this vehicle approximately three weeks ago, yesterday as I was adjusting the dashboard lighting, the service high voltage battery warning came on. Now the vehicle wont take a charge, the vehicle has changed the charge setting to 40%, and I cannot increase it. I 've reserved an appointment for 4/11/2025 for the vehicle to be serviced, and was told that I wont be given a loaner vehicle. This entire scenario is very inconvenient to say the least. This my first Honda and probably my last. I feel that my safety is at risk in this case, as I cant drive it now, since I cant recharge the battery, so the vehicle is totally unreliable at this time. There were no warning signs of this issue, and I'm grateful that the vehicle didnt die in the middle of rush hour traffic, or leave me stranded somewhere.

NHTSA ODI 11653890

Car was charging on a typical 48A J1722 home charger. Car stopped charging early and displayed "Service High Voltage System" and "Reduced Acceleration. Drive with Care" Scanner shows codes P1E00 and U362C

NHTSA ODI 11653131

I was driving and a warning popped up on my dashboard screen telling me that the "high voltage electrical system needed to be serviced" and another one followed that said "acceleration reduced drive with caution." At the same time my heat stopped working and only cold air would blow from the vents (it was a cold day so I did not test to see if the A/C was also broken). I discovered a day or so later, when I went to charge my car (it is an EV) that it would not allow me to charge above 26% capacity.

NHTSA ODI 11653182

2024 Honda Prologue has been having service high voltage system, reduced acceleration, no heat or AC in while in the rain and with toddlers in the car. Car has had this issue twice before and just got the car back from the service on April 2, Had issue in December, Feb 2025 for 11 days. The vehicle was just returned 3 days ago for the same issue. Service keeps stating they don't know what the problem and vehicle is needs to be towed due to inability to charge or drive on Major roadway due to limited speed.

NHTSA ODI 11652964

We received a High Voltage System warning, making the vehicle undrivable. Honda states it is an AC check valve issue. The vehicle only has 477 miles on it.

NHTSA ODI 11652373

After updating my Prologue and driving it for a few miles, I'm now seeing a message that says: "Service High Voltage System / Service vehicle soon." The car will not accept a charge at all and the heat/defroster will not work. It will only blow cold air (which may just be outside air circulating meaning full hvac isn’t working).

NHTSA ODI 11651635