2019 Honda Accord Hybrid electrical problems

Filed May 5, 2026 · Electrical, Engine · CA

Vehicle was being driven on the highway when suddenly engine hesitated and started stalling. Speed was reduced from around 65MPH down to the low 40s. Cars were stacking up behind and passing, causing potential hazardous conditions. Vehicle was taken to a mechanic shop and diagnosed with misfiring, after reading OBD II with many alerts coming on. Further diagnostics revealed cylinder head gasket was leaking coolant into engine, as shown by borescope images. This is a known problem on 2018-2020 Honda Accords with both 1.5T & 2.0 engines. The multiple alert messages started to come on a few weeks ago, but the engine hesitation and stalling just started this week. At first we suspected a 12V battery issue, but testing confirmed battery was at 12.8V with no issues.

Filed Mar 9, 2026 · Acceleration, Electrical · CA

1. Component: The engine head gasket and the combustion system (specifically Cylinder 2). Specifics: A leak-down test confirmed a failure in Cylinder 2, leading to coolant intrusion. This was initially masked by a water pump code, but after the water pump was replaced and the code returned, a borescope confirmed "clean" pistons (steam-cleaned by coolant) and tap scarring. Availability: Yes, the vehicle and all diagnostic records are available for inspection. 2. Emergency Maneuvers: On multiple occasions, the car entered "Limp Mode" while driving 70–75 mph on the freeway. This caused a sudden, dangerous drop in speed, forcing me to maneuver through high-speed traffic to reach the median/suicide lane. Stranded: The vehicle overheated 5 times in one trip, leaving me vulnerable on the side of a busy freeway. 3. Yes. An independent shop confirmed the failure via a leak-down test, a borescope inspection, and physical analysis of the spark plugs. They confirmed that despite the computer throwing a water pump code, the mechanical failure is the head gasket. 4.Status: It has been inspected by an independent service center. I am now using their findings to pursue a lawsuit/claim against Honda for selling a vehicle with a pre-existing internal engine defect. 5. Timeline: Symptoms began in April 2024 (two months after purchase). Initial Signs: An "Emission System" warning light appeared. The diagnostic code indicated a water pump failure, which was replaced in April. Recurring Symptoms: In November, the car suffered multiple misfires and "Limp Mode." In March, the "Emission System" light and the same water pump code returned, but the shop confirmed the pump was functional and the true cause was the head gasket leak into the cylinders.

Filed Mar 6, 2026 · Driver assistance, Electrical · CA

Description of Incident: 1. Component/System Failure: The engine cooling system and head gasket failed. A certified shop has confirmed coolant intrusion and a failed leak-down test on Cylinder 2. The vehicle is available for inspection upon request. 2. Safety Risk: My safety and the safety of my family and other drivers were put at extreme risk. On March 1, 2026, the vehicle suffered a sudden loss of motive power while traveling at 70 MPH on the freeway. The car dropped to 15 MPH instantly, forcing me to maneuver across active lanes to a narrow shoulder with almost no space. I was nearly hit by high-speed traffic. This has occurred over 8 times since 2023. 3. Confirmation by Service Center: The problem has been reproduced and confirmed by an independent service center On Site Lube Auto & Tire. They utilized a borescope and leak-down test to verify the internal engine failure. 4. Inspections: The vehicle has been inspected by a certified independent technician. I am in the process of notifying the manufacturer (Honda) of these findings for their inspection and accountability. 5. Warning Lamps & Symptoms: Prior to the total power loss, the vehicle displayed engine temperature warnings and "check engine" lights. These symptoms first appeared approximately 8 months after purchase in 2023 and have progressively worsened, leading to the current engine failure. 6. Additional Notes: This failure is identical to issues cited in active class-action lawsuits regarding Honda's engine defects, affecting both standard and Hybrid models. I am communicating via written report/email for documentation and accessibility purposes.

Filed Apr 3, 2025 · Driver assistance, Electrical · FL

Forward collision warning stopped working after a system upgrade on my 2019 Honda Accord hybrid. I activate the forward support and immediately it turns off. This is a safety issue. The system assist in breaking in time to maintain car distance and avoid a collision. Contacted Honda. I was told to take it to service at my cost.

Filed Feb 27, 2025 · Driver assistance, Electrical · AZ

Suddenly I get warnings of failure of adaptive cruise control, failure of braking, stearing and forward collision warning failure. It goes away if I drive my vehicle for few miles but then suddenly appears again. No one seems to know what is the issue. I tried to reset setting multiple times, checked system updates and checked battery etc, asked to check if there are any faulty codes but no one seem to know what is going on. It keeps happening every day

Filed Dec 2, 2024 · Acceleration, Electrical · CA

Mid October 2023, we driving on the freeway and the car started to slow down on its own. We could not accelerate to match the speed of cars around us or to get the speed limits in a 55 to 65 zone, making it dangerous for us and others to continue driving on the freeway at extremely slow/low speeds. We towed it the dealership, who said it was defective spark plugs. This car was only 4 years old with extremely low millage and the spark plugs should've last a lot longer. They changed the spark plugs under warranty. Late November 2024, we were getting off the freeway and the check engine light came on but there were no service codes. Everything was running normally except for the engine was making a loud noise. We parked at a shopping center and approximately 30 minutes later, restarted the car and all these messages and icons appeared for: Vehicle stability assistant system problem, Hill start assistant problem, ACC, Collision Mitigation breaking system problem, Road departure mitigation system problem, Emissions system problem, TPMS, Brake system problem, Electric power steering system problem. Towed it dealership and after an hour of diagnostics testing, they said it’s the spark plugs again! Just a little over a year and 2 out of 4 spark plugs are bad again. This is not right. We hardly drive this car and it’s only a little over a year since the spark plugs were replaced and a little over 5 years since we got the car brand new. Spark plugs are supposed to last 10 years or 100,000 miles and we’re not close to either. This time they said it's not covered under warranty and is over $800.

Filed Oct 28, 2024 · Electrical · PA

There is an issue going on in which the door lock actuators within the Door Latch Assembly are failing. This issue happened to my vehicle and through a Google search you can see that it's happening to several others. Because of this issue, the doors of the vehicle will not open via remote unlock, only via manual insertion of the key and physically unlocking the other doors. In a situation where you need to quickly enter your vehicle, this is very problematic. Additionally, if I choose to remote start the vehicle, as soon as I use the physical key to unlock the driver side door, the vehicle turns off essentially negating the remote start. I went to the dealership and used the diagnostic device to determine that these devices were failing electronically and I had to have both of my left side assemblies replaced at a high cost.

Filed Dec 2, 2023 · Electrical · OR

Car makes a highly audible hum resonance at 45-55 mph. This sounds like a very load wheel bearing issue but it apparently related to auto noise reduction system putting the sound through the speakers. This is a known Honda issue they need to fix, shouldn't happen on a nearly new car.

Filed Aug 1, 2023 · Electrical · PA

The malfunctioning component is the electronic door lock system of my 2019 Honda Accord Touring Hybrid, specifically the driver's side door. This problem persists and is available for inspection. The failure of this system posed a safety risk as it prevents secure access and egress from the vehicle. I was unable to unlock my vehicle using the electronic key fob or the interior lock/unlock button, which could pose a problem in emergency situations where quick exit from the vehicle is required. The problem has been reproduced over a period of 6-8 weeks, with the issue becoming consistent and isolated to the driver's side door. The issue has not been confirmed by a dealer or independent service center yet, nor has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others. My car has recently aged out of warranty and given the experiences of others online, I don't have the money to hand over to the dealer for diagnostic fees with zero resolution. There were no warning lamps, messages or other symptoms prior to the issue's occurrence. It started sporadically, sometimes affecting different doors, but in recent weeks, it has been a consistent problem with the driver's door. This problem isn't exclusive to my vehicle. I've read online forums where others, even with different models of Honda Accords, have encountered similar issues, suggesting this could be a common issue across certain models. One person described a similar, erratic door lock behavior where the failure would switch from door to door. It was speculated that the issue could be either software-related or potentially a faulty relay that couldn't supply power to all the actuators simultaneously. Given these circumstances, I think it's crucial to investigate this matter further, as it poses both a security and safety risk for Honda Accord users.

Filed Nov 20, 2021 · Electrical, Engine · OH

Vehicle repeatedly experiences a "cylinder misfire error" when driving above 45 mph. The check engine light will flash and the car surges like it is stalling. Loss of the ability to accelerate when it occurs. Also, the car shakes violently when the vehicle comes to a stop before turning off the engine. Many times, after restarting problem temporarily stops. I have taken it to the dealership multiple times, but problem is unsolved. Happens at least once a week. Started at 58,000 miles. More recently, the vehicle experiences a safety system failure when driving above 45 mph. 10 system warning lights were activated and will continually appear on instrument panel. Warning lights activated: 1. Hill Start Assist Problem 2. Adaptive Cruise Control System Problem 3. Collision Mitigation Braking System Problem 4. Road Departure Mitigation System Problem 5. Emission System Problem 6. Tire Pressure Monitor System Problem 7.Brake System Problem 8. Electric Power Steering System Problem 9.Vehicle Stability Assist System Problem 10. Brake Hold System Problem