2018 Honda Accord Engine

While driving on the NJ Garden State Parkway on an incline, the car went into LIMP HOME MODE in the middle of heavy traffic causing the speed to get dangeriousily very slow. I had to make my way across many lanes to get the edge of the road. After shutting off car I was able to restart and drive to work. My father came to my work and looked at car and added Honda antifreeze becuase it had seeped into combustion chambers Then drove the our Honda dealer. Just before he got to dealer driveway the car missed and hesitated but was able to make it to dealer. Dealer determined it was the common problem with the 1.5T engines, the head gasket failed. Check engine light never went on or any overheating (I was lucky) .While engine was apart, other work was agreed to as being cost-effective. The car prevousily had Honda car with 0 deductable until 100,000 miles. Car has always been serviced by dealer with more service than Honda requires and I have all service records from purchase to prove it. Last service before incident was 10/14/2025 . What makes this worse is that my son (2018 Civic) and my brother (2020 Accord) also have Honda cars that are destined for the same failure based on what is known about the defective 1.5T engines.

I lost power to the vehicle in the middle of the road as I was accelerating uphill approaching a stop light getting ready to get on the on ramp to the highway. All the dashboard lights came on and the check engine light was flashing. I had to let my car idle it's way to the side of the road. I took my car to a Honda dealership. Diagnosis showed cylinder 3 misfire, coolant leaking into cylinder 3 indicating a blown head gasket. A couple of weeks before the loss of power to the vehicle, my car was sputtering and jerking when accelerating. It would get really bad when accelerating uphill.

On August 25th 2025 we were driving the vehicle on the freeway at 55 MPH and upon acceleration the vehicle started to decelerate and the check engine light came on. The vehicle would not go over 10 MPH at this point. We took it to the dealership to have the issue addressed. They told us that the issue was a misfire in cylinder #3. They told us the vehicle will need to relearn the firing order and for the next 2 weeks the vehicle was rough idling upon startup. We called the dealership to make an appointment to have that issue addressed and took the vehicle back to the dealership. On September 10 we were told by the dealership the head gasket is blown. We were told that they are seeing that this is becoming a more common issue with the engine of this year model vehicle.

I attempted to start my vehicle's engine normally and the engine made a rough cranking sounded and then finally started. The dashboard displayed multiple warning messages immediately after: Emission system problem/avoid heavy acceleration and high speed/see your dealer, tire pressure monitor system problem/check tire pressure/see your dealer, brake system problem/brake performance may be reduced/see your dealer, brake hold system problem/apply brake when stopped/see your dealer, electric power steering system problem/steering assist reduced/see your dealer, vehicle stability assist system problem/reduced traction and handling/see your dealer, hill start assist problem/vehicle may roll upon brake release/see your dealer, adaptive cruise control system problem/see your dealer, collision mitigation braking system problem/see your dealer, road departure mitigation system problem/see your dealer. I was able to carefully drive and drop off the vehicle at the dealership. The dealership conducted an inspection and found "the check engine light was illuminated due to a misfire in cylinder two. The diagnosis has revealed that this is caused by a bad head gasket, which is allowing a small coolant leak into the cylinder. To address this issue, the technician is recommending the replacement of the cylinder head gasket and spark plugs. Additionally, the technician has noted that the fuel injectors are a known failure point and suggest replacing them as well while the work is being performed." Also, the service employee told me verbally that this is a common issue with the Honda 1.5 turbo engines and they see this all the time. I authorized the replacement of the cylinder head gasket and spark plus since the cost was covered under my existing powertrain warranty with Honda. After a week, the vehicle was released to me and working fine. My safety and the safety of others with a similar engine was put at risk due to no prior warning and the impairment of critical safety systems.

Failed head gasket. Resulting in complete engine replacement including turbo. Causing my car to go sluggish while driving Dealership inspected and confirmed engine and turbo replacement needed All the lights on the dashboard came on at time of incident

3 weeks after having this vehicle, the car started running hot and experiencing all types of jerking problems. I started to do my research on why suddenly the car was running hot, jerking, and other things. I noticed a thread line expressing the EXACT same issues that I was experiencing which were from bad head gaskets. I took my vehicle to the dealership to have this issue checked and verify. I also had an independent mechanic shop evaluate the vehicle as well. Both results were the same. This is a design flaw on the manufacture behalf and I reached out to the Honda Corporate only to be denied assistance with fixing the known issue because it was “out of the date” range for their goodwill claim. This vehicle will run hot and you will have to pull over on the side of the road to allow engine to cool in order for it to operate.

Car had 80 thousand no heating or oil problems has been maintained through Honda. Recall on fuel pump replaced. Car starts rough, took it in a diagnostic was done revealing a possible leak near 3 cylinder possibly head gasket. Code P0304 came up with all break light codes reading. No oil leak. No over heating. Honda indicates blown head gasket.

Lost coolant and engine over heated. Inspected by shop and determined that the coolant is leaking into the engine due to head gasket issue. This could cause extreme engineer overheating and cause fire in engine. based on available information from other owners of the accord 1.5T 2018, this is common issue.

Mechanic shop verified blown head gasket. Vehicle never overheated and was diagnosed after vehicle began to feel like it was misfiring. Mechanic used scope and found coolant leaking into head.

My 2018 Honda Accord Sport has experienced repeated engine and turbocharger problems related to a likely head gasket failure. For nearly two years, I had to replace the spark plugs every six months without ever getting a check-engine light. When I brought the vehicle to Hardin Honda in Anaheim, the dealer ran a test and said the head gasket was fine at that time. However, the issues continued, and eventually, the head gasket and turbocharger both failed. I can't spent about $4,000 in repairs, and I lost significant time without my vehicle, which affected my ability to work. Additional Details: Honda replaced my fuel pump twice. The first failure caused my engine to go into limp mode on the freeway, which was extremely dangerous and also damaged the turbocharger. Honda replaced the engine computer (ECU) only six months after I purchased the car. When I contacted Honda corporate, they admitted to being aware of this issue but said they would only offer reimbursement if a recall was issued in the future. Safety Concern: The sudden loss of power at highway speeds is a serious safety hazard. This issue appears to be widespread among owners of the 1.5L turbo engines, and many drivers are reporting similar head gasket and turbocharger failures. Requested Action: I am requesting a formal investigation into the 1.5L turbo engine design and related head gasket and turbocharger failures in 2018 Honda Accords. These problems pose a clear safety risk and result in high out-of-pocket repair costs for owners.

Head casket issue caused the engine to go bad .. every light on dash board is on

Head gasket problem. Coolant leaking into cylinder #2, head gasket needs replacing. The car is currently at a Honda dealership & they inspected/ confirmed that this was the issue. They expressed this was a common issue with this car. The first signs of issues happened while driving uphill on the freeway, the car started to “jump” when trying to accelerate. A couple of minutes later, the car would not accelerate while driving & the check engine light turned on. The second time, this happened much quicker. In a span of a couple of seconds, the car “jumped” while driving on the freeway again, and slowed down and would not accelerate, but various lights on the dash turned on this time. This is obviously very dangerous as a car suddenly decelerating while driving can cause the driver and others on the road to crash. There were no warning lights on prior to the first incident.

100k miles on our Honda when there showed Misfire in cylinder 3 kept coming up. Changed the coils and spark plugs. The car lost power on the freeway almost resulting in a collision. Had the car towed to Honda dealership where they quoted us 4800$ for a head gasket. Honda knows what they’ve done. I will never in my life buy another Honda.

While driving, my 2018 Honda Accord suddenly lost power and went into limp mode with no prior overheating or warning signs. The acceleration dropped instantly, and the vehicle nearly caused an accident as it seized up in traffic. Diagnostic scan showed a P0303 cylinder 3 misfire, which is consistent with head gasket failure. The issue has been widely reported among other Honda Accord owners with the same engine, and it appears to be a recurring defect. This failure is dangerous because the car can lose power abruptly at highway speeds or during normal driving, putting drivers and passengers at risk of collisions. The vehicle was properly maintained and had no prior indication of internal damage or overheating. The head gasket failure is sudden and mechanical, not caused by user neglect. It needs to be investigated as a manufacturer defect before it leads to serious accidents or injuries.

Head gasket for the second time

*The engine head gasket- The engine sucked the water from the radiator. *The car overheat in Highway and I had to wait for help to open the radiator to fill it with water *By an independent service center *Not yet- I will take it to a dealer Wednesday the 12th *All the dash lights came up and the next day the temp indicator was going up and down

I own a 2018 Honda Accord with approximately 131,000 miles. The vehicle suffered a blown head gasket that my mechanic identified as originating from a known design or manufacturing defect in Honda’s 1.5-liter turbocharged engine. They diagnosed the problem before they had my vehicle in their possession because they have already seen this so many times in other 2018 Honda Accords. The engine began showing symptoms such as coolant loss, rough idle, "Christmas tree" engine lights, and an overheating warning light. There was no sign of external coolant leakage. A professional inspection confirmed head-gasket failure. I have maintained the vehicle according to Honda’s recommended service schedule and have documentation for all maintenance. I contacted my local Honda dealership and Honda’s customer service department seeking goodwill or warranty assistance. Despite multiple attempts and escalation to a “warranty specialist,” Honda denied coverage and refused to contribute to repairs. The repair estimate exceeds $5,700, which is unacceptable for a vehicle with regular maintenance and a known pattern of premature engine failures. Online owner forums and public databases show many other reports of the same issue. I believe this defect poses a safety concern, as overheating or sudden engine failure can occur while driving, creating risk of loss of power, stalling, or fire. I am requesting that NHTSA investigate the widespread head-gasket and engine failures on late-model Honda vehicles equipped with this engine to determine whether a recall or manufacturer accountability action is warranted.

My 2018 Honda Accord at only 63,000 started to lose power and all the emergency lights went on. Diagnosed as a misfire and now requires a new head gasket. This was told to me by the dealer to be a well known problem with the 1.5 T 2018 Honda Accord.

The contact owns a 2018 Honda Accord. The contact stated that occasionally, while driving at various speeds, the vehicle jerked and the engine lost compression. The check engine warning light was occasionally illuminated. The vehicle was taken to a local dealer, where it was diagnosed, and determined that the spark plugs needed to be replaced. The vehicle was repaired; however, the failure reoccurred. The vehicle was towed back to the same local dealer where it was diagnosed with a blown head gasket. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 112,000.

The contact owns a 2018 Honda Accord. The contact stated that two weeks after the vehicle was repaired under an undisclosed NHTSA Campaign, the message "See Dealer" was displayed. Several unknown warning lights were illuminated. The vehicle was towed to the same local dealer, and the fuel injectors were replaced. The contact stated that while her daughter was driving at an undisclosed speed, the engine temperature gauge became elevated. The vehicle was taken to a local independent mechanic; however, the failure could not be duplicated. The contact stated that after starting the vehicle, the check engine warning light illuminated. The vehicle was taken to a local O' riley, where it was diagnosed with turbo assembly sensor failure. The vehicle was taken to a local independent mechanic, where it was diagnosed with a turbo assembly sensor failure. The vehicle was repaired; however, there was a misfire coming from the engine. The spark plugs, coils, and battery were replaced; however, approximately 6 days later, the check engine warning light illuminated. The vehicle was taken back to the same independent mechanic, where it was diagnosed with a rocker arm oil control solenoid failure. The manufacturer was made aware of the failure and informed the contact that, due to the age and mileage of the vehicle, a Goodwill service would not be performed. The failure mileage was approximately 116,699.

Turbocharger. All dashboard lights are on in vehicle. All safety measures implanted in the vehicle (land departure, cruise control, etc) is not working. The vehicle jerks when attempting to accelerate over 40 mph.

The contact owns a 2018 Honda Accord. The contact stated that upon starting the vehicle, the vehicle shuddered abnormally. The contact turned off and restarted the vehicle, and several unknown warning lights illuminated; the vehicle continued to shudder. The contact was able to drive the vehicle, but the vehicle failed to exceed 12 MPH. The contact activated the hazard lights. The vehicle was taken to the dealer, where it was diagnosed with head gasket failure, causing coolant intrusion into the cylinders and damage to the timing chain. The dealer replaced the head gasket and the timing chain. The vehicle was repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 100,000.

Engine head gasket failed allowing a coolant leakage, which damaged spark plugs and fuel injectors. There is video evidence of this failure provided by the dealership service center. Link to video: [XXX] This occurred at approximately 70k mileage, which is far earlier than a failure like this would be reasonably foreseeable. I see many, many, others online who have had the same failure on my model of car at similar (early) mileages of 70k-90k. My car lost power on the highway, leading to a dangerous driving condition for myself an others. There was no obvious warnings that this would occur. After pulling over and turning off then turning on the car again, the car was intermittently drivable, with clear engine trouble. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The Cylinder head gasket The vehicle heats up and causes us to pull over which impedes traffic The maker knows of said issue but has yet to address it A qualified mechanic has examined the vehicle and diagnosed the issue There was no warning

The contact's son owns a 2018 Honda Accord. The contact stated that while driving at an undisclosed speed, the vehicle started sputtering and the engine overheated. The engine overheating warning light was illuminated. The vehicle was taken to the local dealer to be diagnosed, and it was determined that the engine needed to be replaced. The contact was informed that there was a crack in the engine head. Additionally, radiator fluid was leaking into the engine oil. The vehicle was not repaired. The owner had replaced the turbocharger prior to the failure. The manufacturer was contacted, but no assistance was provided. The failure mileage was approximately 160,000.