2019 Honda Accord Hybrid: engine overheating

Filed Sep 9, 2026 · Engine, Transmission · OH

The vehicle has a documented, severe manufacturing defect involving a cylinder head gasket leak under Honda Service Bulletin 26-006. A certified technician at Honda East Cincinnati confirmed the head gasket leak in writing on September 9, 2026. Prior to this, an independent facility pulled code P0302 (Cylinder 2 Misfire) and used a digital borescope to capture video proof of liquid coolant pooling inside Cylinder #2. Despite written documentation from both facilities confirming an active internal engine leak, American Honda Corporate and the dealership are refusing to honor the warranty extension. They are requiring me to continue driving an unstable vehicle until it actively throws a code on a proprietary dealership scanner. Forcing a consumer to drive a vehicle with a known, documented internal coolant leak risks sudden engine seizure, overheating, and catastrophic stalling on public highways, creating a severe and preventable crash hazard.

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 Jul 29, 2025 · Engine · WA

Component or System Failed: The head gasket appears to have failed, leading to coolant leaking into cylinder 4. This has been confirmed by two separate service centers. The vehicle is currently available for inspection if needed. Safety Risk: The failure caused engine misfires and dashboard warning lights to activate while driving, which could have led to a sudden loss of power or control. I had to pull over and restart the vehicle to regain drivability, which put my safety and that of others at risk. Reproduced or Confirmed by a Dealer or Service Center: Yes. The issue was first diagnosed by Honda of Sumner, who initially suspected a compression issue. Their master mechanic later confirmed it was likely a head gasket failure. A second opinion from Greg’s Japanese Auto confirmed the diagnosis and provided photos showing coolant in the cylinder. Inspected by Manufacturer or Others: Yes. The vehicle was inspected by Honda of Sumner and Greg’s Japanese Auto. No inspection has been done by police or insurance representatives. Warning Lamps or Symptoms Before Failure: Yes. After a recent service (which included an AC repair, fuel pump recall, and oil change), I experienced two misfires in cylinder 4 within 24 hours. All dashboard warning lights came on during one of the incidents. These symptoms began four days after the service. Additional Context: I was quoted $8,100 for the head gasket repair by Honda. I believe this issue could have been detected earlier during the diagnostic service. I’ve since learned of a class action lawsuit involving this exact issue in my vehicle’s generation, which makes me concerned this is a known defect.

Filed May 14, 2025 · Engine · OK

Blown head gasket repaired after unknown coolant loss. Eventually intermittent warnings to pull over and slow down which resolved within seconds. Continued until it was determined the gasket had failed. Numerous instances of hybrid engines failing in this manner. Repaired by independent shop.

Filed Mar 20, 2025 · Engine · CA

I am writing to express my serious dissatisfaction with the engine head gasket on my 2019 Honda Accord EXL. Following my Honda consultant, I have experienced a engine head gasket malfunction where it has a head gasket crack. This led to leaking into the engine piston which will cost me $5000 to repair. There was no signs and symptoms that the incident was going to happen. I would also say I am a pretty conservative driver when commuting. The ongoing engine issues could potentially lead to serious safety concerns due to overheating, possible engine damage, and safety for others on the road. This problem has not been confirmed by the dealer and on many public forums people have had similar issues with this when there car is fairly new.

Filed Feb 8, 2025 · Engine · IN

Component that failed was the head gasket. Willing to have vehicle inspected. However this incident occurred roughly 7 months ago at 125k miles. Safety was put at risk due to engine overheating which could've caused a fire. I haven't asked the dealer if they've seen it before however this issue is easy to find on forums for this vehicle. The vehicle was only inspected by the dealer who repaired it, I was told by them they had to send off some part of my engine to honda to ensure it wasn't warped before repairing. The ridiculous part was the only warning I received in my car was engine temp high if you ask me such a major failure should cause the check engine light to come one. I had no other warnings than the temp warning. My vehicle doesn't even have a Guage to display the engine temp. To ensure the listed vin shows the correct model I drive a 2019 honda accord hybrid ex with 133,500 miles.

Filed Jul 12, 2024 · Engine · CA

The head gasket on the engine has blown at only 94,000 miles. Car overheated on the side of the freeway and I took it to the dealership. Dealer confirmed that the head gasket was leaking. Check engine light and a temp warning came on as the car overheated.

Filed Jun 30, 2019 · Visibility · 5,500 miles · TX

I was driving and entering the freeway when my car made a loud exploding pop. There were no cars next to me as I was entering the on-ramp. There were no overhead bridges or trees. Nothing fell from the sky. I stopped the car and found the sunroof shattered with a large hole. There was no debris inside other than glass. I believe that there is a defect with the sunroof that caused it to shatter. It should not have shattered this much with just normal use. This occurred about 5 minutes after leaving my indoor garage so the car/sunroof was not overheated. If the inner cover was open at the time, the glass would have shattered into the car and caused a serious accident. I have seen multiple reports of this same thing happening and this needs to be addressed with the manufacturers before someone is hurt or killed.