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The 2024–2025 Honda Prologue “Service High Voltage” Issue Owners Keep Reporting
As part of my regular work representing consumers in lemon law, I spend a significant amount of time reviewing manufacturer technical service bulletins. These bulletins often reveal early warning signs of problems that owners are only beginning to experience in real life.
While reviewing Honda service bulletins in mid-2025, one document involving the 2024–2025 Honda Prologue caught my attention. It addressed a “Service High Voltage System” warning, battery communication faults, and potential 12-volt battery discharge. On its own, that might not seem unusual. But when I compared the bulletin with owner complaints, a clear pattern began to emerge.
I’m Sergei Lemberg. For more than twenty years, I’ve represented consumers in lemon law and warranty matters. The more I reviewed Prologue service records, forum posts, and repair descriptions, the more consistent the reports became. Owners were experiencing high voltage system warnings, often during routine charging. Some described reduced acceleration. Others lost cabin heat.
Here is what the research shows. Let’s dive in.
High Voltage System Warnings That Keep Coming Back
In my research, I found that the same high voltage warning appeared repeatedly across owner reports. Whether the vehicle was brand new or only a few weeks into ownership, the dashboard message was often the same: “Service High Voltage System.”
Owners described the message appearing during charging, after software updates, or shortly after starting the vehicle. In many cases, it was accompanied by noticeable changes in how the Prologue drove or functioned.
Based on owner reports, service records, and complaint descriptions, the most common symptoms included:
- “Service High Voltage System” warning on the instrument panel
- Malfunction Indicator Light appearing without explanation
- Reduced acceleration or power limitation
- Cabin heat or climate control shutting off
- Charging interruptions or failures
- Repeated dealer visits for the same fault
- 12-volt battery drain or no-start conditions
Owner Complaint Examples
Here are examples of actual complaints submitted to the NHTSA:
1) “Multiple times the Prologue has been in service for high voltage system and reduced acceleration errors that have come on during charging.”
2) “My boyfriend went to charge the car and it stopped and gave a high voltage message and then the heat stopped working so next day day took it to the dealer and they said they ruled out the battery but there is a component that is broken allowing the coolant to cool off battery. The have no ETA on the part. I purchased this car on December 18, 2024 and here we are a little over 30 days and it’s in the shop. I have seen on forums a lot of people experiencing same issue.”
3) “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.’ My Prologue only has 1,096 miles on it.”
What the 25-043 Service Bulletin Says
Honda mentioned this issue in a Technical Service Bulletin released on May 23, 2025, identified as Service Bulletin 25-043. The bulletin applies to all 2024–2025 Honda Prologue vehicles.
Honda attributes the condition to an internal Battery Energy Control Module (BECM) calibration anomaly, which means a software-related control issue within the system that manages the high-voltage battery.
Honda’s repair procedure instructs dealers to:
- Update the BECM software
- Perform the manual reset procedure twice
- Clear all diagnostic trouble codes
- Charge and test the 12-volt battery
The bulletin does not restrict the issue to a limited production batch or narrow VIN range. It applies broadly to Prologue vehicles across both model years.
Where Things Stand Now
As of this writing, there is no formal recall associated with this issue. The Technical Service Bulletin is a repair procedure sent to dealers, not a mandatory safety recall that triggers direct consumer notification. This means many Prologue owners may be unaware that a known fix exists unless they’ve already experienced the problem and brought their vehicle in for service.
Some owners report that even after the software update and manual reset procedures, the high voltage system warnings return.
What You Can Do
If you own or lease a 2024–2025 Honda Prologue and have experienced high voltage system warnings, reduced performance, or related issues, here are the steps you can take:
Document everything. Keep detailed records of every warning message, service visit, and conversation with the dealership. Note the date, mileage, and specific symptoms each time the problem occurs. Take photographs of warning messages on your instrument panel. Save all repair orders and service records.
Request the Technical Service Bulletin repair. If your dealer hasn’t mentioned TSB 25-043, ask specifically whether the Battery Energy Control Module software has been updated and whether the manual reset procedure has been performed.
Report continued problems immediately. If the issue returns after the TSB repair, document the recurrence and bring the vehicle back to the dealer. Make sure each subsequent visit is recorded as a separate repair attempt for the same problem.
File a complaint with NHTSA. The National Highway Traffic Safety Administration maintains a database of consumer complaints at www.nhtsa.gov/recalls. Your report contributes to the agency’s monitoring of potential safety defects and may support future investigations.
These steps protect your rights and create the documentation you may need if the problem cannot be resolved through ordinary warranty repairs.
Get a Free Case Evaluation
If your Honda Prologue has experienced repeated “Service High Voltage System” warnings, reduced power, charging problems, or extended time in the shop, you may want a professional review of your situation.
My firm offers free case evaluations. There is no cost to ask questions. And if a case is accepted, we work on a contingency basis — meaning you pay nothing unless we recover compensation for you.
If you would like to discuss your Prologue experience, you can reach out for a confidential, no-obligation review.
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About the Author:
Sergei Lemberg is an attorney focusing on consumer law, class actions related to automotive issues, and personal injury litigation. With nearly two decades of experience, his areas of practice include Lemon Law (vehicle defects), Debt Collection Harassment, TCPA (illegal robocalls and texts), Fair Credit Reporting Act, Overtime claims, Personal Injury cases, and Class Actions. He has consistently been recognized as the nation's "most active consumer attorney." In 2020, Mr. Lemberg represented Noah Duguid before the United States Supreme Court in the landmark case Duguid v. Facebook. He is also the author of "Defanging Debt Collectors," a guide that empowers consumers to fight back against debt collectors and prevail, as well as "Lemon Law 101: The Laws That Lemon Dealers Don't Want You to Know."
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