2020 HONDA ACCORD HYBRID Electrical System Problems

WHEN USE RIGHT TURN SIGNAL, AUDIO [RADIO] CUTS OUT. WE REPORTED IT TO THE DEALER IN [XXX], THEY COULD NOT DUPLICATE THE PROBLEM. INTERMITTENT PROBLEM [XXX]- USE RIGHT TURN SIGNAL, RADIO CUTS OUT. HONDA DEALER REPLACED ELECTRICAL HARNESS WHILE STILL UNDER WARRANTY [XXX] - SAME PROBLEM - USE RIGHT TURN SIGNAL, RADIO CUTS OUT. HONDA DEALER REPAIRED ELECTRICAL HARNESS - no longer under warranty. DEALER CHARGE $190 INSPECTION FEE [XXX]- SAME PROBLEM - USE RIGHT TURN SIGNAL, RADIO CUTS OUT. - no longer under warranty. DEALER CHARGE $190 INSPECTION FEE - DEALER WANTED $3212 TO REPAIR 6/13/25- CALLED AMERICAN HONDA CORP. Spoke with [XXX] 800-382-2238, Case#[XXX}. 9/15/25- After MONTHS of emails/ documentation of repair bills/ phone calls , AMERICAN HONDA CORPORATION REFUSES TO PAY FOR ENTIRE $3212 REPAIR BILL. TOLD US TO PAY $1000 TOWARDS THIS REPEATED ELECTRICAL PROBLEM. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I am reporting a potential safety issue with my 2020 Honda Accord Touring Hybrid. On September 4, 2025, my dealership identified a non-genuine purple quick-splice connector in the driver’s door harness, which they attribute to error codes B1142 (Driver’s Door Lock Knob Switch Circuit), U0199 (Lost Communication with Driver’s Door Module), and U3003-16 (Electric Servo Brake Control Unit Power Source Low Voltage). This connector, not installed by the recent audio installer who put only upgraded speakers and deemed non-Honda, may be an aftermarket modification (possibly an alarm/tracker or anti-theft device) causing electrical faults. While no water was found, the issue could impact brake assist (U3003-16), posing a safety risk. I request NHTSA investigate whether this reflects a widespread manufacturing or modification defect, especially given reports of similar quick-splices at dealerships for repos or fleet locking. A Reddit user said, “ We see these at our dealer frequently. Those are quick-splices, usually used to piggyback off your oem wires to supply voltage/signals to an aftermarket alarm/tracker. Other dealerships install this in the event of repos/auto locking an entire fleet/or additional anti-theft.”

While diving at highway speeds (first at 55mph in may 2025 and then again in July 2025 at 65mph) I got a warning on screen about power loss and a critical failure and that power will be reduced and to stop at the side of the road. Within 30 seconds or a minute of the warning the car power cut out significantly impacting the speed and both times almost causing traffic behind me to hit me from behind. I took it to Honda dealership in dulles, va back in may 2025 and they told me it was the electric water pump which I had replaced. Now in July it happened again and this time I had my wife and child with me in the car as well as a guest. I had to pull over and all the warning lights started to flash (everyone of them). I have taken it back to Honda but having a car that goes from 65mph to 25mph on the highway with no warning to others is a recipe for disaster. Apparently this is a known issue with the hybrid system and the battery needs replaced (from online honda forums) which Honda is not doing unless forced. I am still waiting for my dealer to get back to me but its exactly the same problem as the other notes I saw online. My car only has 46,000 miles.

Mileage: 46,002

Without driver intervention, the vehicle engaged the brakes. Threw both passengers forward until the seat belt restraints engaged. Bruising both passengers shoulders. The vehicle would not respond to either pedal - brake or gas for a few seconds. There was no visible traffic in front of us. The day was clear. And no construction or overpasses. The vehicle was taken into a certified Honda dealer and inspected. No “flags” or diagnostic issues found. The car was driven by the dealer. The issue wouldn’t reproduce. The dealer stated that they did find a large “smashed” bug on one sensor and wondered if it could have caused the issue. Prior to the vehicle initiating the panic stop, no indications of a event were posted on any device in the vehicle

I was driving yesterday accordingly to the speed limit on a main city street. There were no cars in front of me AT ALL when all of a sudden my car hit the breaks 3 times back to back out of nowhere causing my car to swerve! I felt completely out of control of my vehicle and I am so thankful I wasn't on the highway and that no one was near me! I first noticed issues with the breaking system, previously on 3 other occasions throughout my time of owning/leasing the vehicle. 3 other occasions before receiving an alert on the screen that read "the brake system has a problem. Avoid high speeds and sudden braking. Have your vehicle checked by a dealer immediately." That was February 13, 2022. I called immediately to take my car in and was told I would have to pay out of pocket to have this issue addressed which seems outrageous to me since it is something that I have no control over. So without the ability to pay such a high fee for a vehicle that I thought would keep me safe, I took it to a local auto shop and had my brakes checked while I had my routine maintenance done. I was told everything was fine, which in my opinion indicates it is at fault of the manufacturers.. I don't want to die before something is done. There have been many claims about the same thing happening. I'm truly shocked there hasn't been a recall due to this issue.

While driving at highway speeds (50 -55mph), the ANC (active noise control) unit delivers a loud Booming sound through the speaker system. The sudden and unexpected booming noise startled the driver causing temporary loss of control of the vehicle. The solution has already been identified in a Service Bulletin from Honda as Service Bulletin 21-053. The ANC unit has incorrect software and requires replacement to fix and eliminate the safety hazard. The issue was noted June 29th, 2021; but, has not been escalated as a Safety Recall. I have replaced the ANC as directed by the Service Bulletin and it has resolved the problem; however, other Honda vehicles have this same safety issue and if not Recalled will continue to be a safety concern for all drivers on our highway. I would like to see this escalated to a Safety Recall level and customers notified to replace. I am disappointed that Honda has not proactively Recalled this.

A loud booming / vibrating noise from the speakers while traveling between 52 & 54 mph with windows closed. Sound starts as a low noise / vibration and escalates to its maximum before abruptly ceasing. Noise / Vibration first noticed when taking car home after initial delivery 3/28/2020. Vehicle use was minimal (due to COVID shutdowns) and noise not noticed again until late fall / early winter of 2020. Vehicle was taken to dealer at regular service interval in February 2021 and problem was evaluated at that time. Vehicle has been evaluated once and microphone for Noice Cancelling system replaced. Issue subsequently returned. Vehicle going for second repair.

TL* THE CONTACT OWNS A 2020 HONDA ACCORD. THE CONTACT STATED WHILE DRIVING 53 MPH, THE ACCELERATOR PEDAL WAS DEPRESSED AND AN ABNORMAL SOUND WAS COMING FROM THE SPEAKERS. THE CONTACT STATED THAT THE ABNORMAL SOUND INTERFERED WITH HIS ABILITY TO OPERATE THE VEHICLE. THE VEHICLE WAS TAKEN TO FOX HONDA (3050 BROADMOOR AVE SE, GRAND RAPIDS, MI 49512, (616) 956-0000) WHO INFORMED THE CONTACT THAT THEY WERE UNABLE TO ASSIST HIM. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER HAD BEEN INFORMED OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 200.

Mileage: 200

TL* THE CONTACT OWNS A 2020 HONDA ACCORD. THE CONTACT STATED WHILE DRIVING 55 MPH, SHE HEARD AN ABNORMAL NOISE INSIDE THE VEHICLE. THE CONTACT STATED NO WARNING LIGHT WAS ILLUMINATED. THE VEHICLE WAS TAKEN TO RAIRDON'S HONDA OF SUMNER (6302 AUTO LN, SUMNER, WA 98390, (253)826-6800) WHERE IT WAS DIAGNOSED WITH NEEDING THE ACTIVE NOISE CANCELLATION (ANC) SYSTEM TO BE REPLACED. THE VEHICLE HAD NOT BEEN REPAIRED AS OF YET. THE MANUFACTURER INFORMED THE CONTACT THAT THEY WERE AWARE OF THE FAILURE WITH THE ACTIVE NOISE CANCELLATION (ANC) SYSTEM AND WERE WORKING ON A REMEDY. THE FAILURE MILEAGE WAS APPROXIMATELY 760.

Mileage: 760

LOUD BUZZING NOISE RANDOMLY. I THINK ITS AN ISSUE WITH THE ACTIVE NOISE CANCELATION SYSTEM. IT'S LOUD, RANDOM AND FREQUENT. NOTICED IT AS SOON AS I GOT THE VEHICLE. HAVE FOUND FORUMS WHERE THIS IS A COMMON ISSUE.

Mileage: 300

NEW CAR, LESS THAN 2000 MILES. ALL OF A SUDDEN LOUD NOISE IS COMING OUT OF THE SPEAKERS, SOMETHING LIKE AN AUDIO AMPLIFIER NOISE UNDER LOAD, BUT VERY LOUD. HAPPENS RANDOMLY, CAN BE REALLY DISTRACTING.

Mileage: 1,700