Honda Civic overheating problems

Filed Oct 18, 2026 · Engine · IL

My 2020 Honda Civic experienced engine overheating and a cylinder 3 misfire (P0303). Two independent mechanics diagnosed a blown head gasket with coolant leaking into cylinder 3. The vehicle underwent a head gasket repair under Honda’s extended warranty. Less than a week after the repair, the engine overheated again while I was driving. I pulled over, waited approximately an hour for the engine to cool, added coolant, and drove to the dealership. The dealership later reported that the cylinder head was cracked near cylinder 4, close to the exhaust valve. When I picked my car up from the dealership, I scanned the vehicle and found the P0303 cylinder 3 misfire code. I am concerned that the engine may have an unresolved problem that could cause it to overheat again, sustain further damage, or lose power while driving. The vehicle is still in my possession and available for inspection. I have an appointment with an independent mechanic on October 24, 2026, to have the engine and cooling system inspected and determine what may have caused the repeated overheating. I am submitting this complaint to bring attention to a potential engine or engine-cooling safety defect and ask the federal safety agency to consider whether similar problems may be affecting other vehicles.

Filed Sep 24, 2026 · Engine · NC

Vehicle: 2019 Honda Civic (1.5L turbo), VIN [XXX] Mileage at failure: ~167,000 Component: Engine — head gasket Description: My 2019 Honda Civic with the 1.5L turbocharged engine suffered a blown head gasket, diagnosed by my Honda dealer. The car was purchased brand new from the same dealership. Symptoms were coolant loss with no visible external leak — coolant was leaking internally into the cylinders, causing misfires. This is a known defect with the 1.5L turbo engine affecting 2016–2021 Civics. Honda issued a warranty extension for this exact failure (10 years / 150,000 miles), which acknowledges the defect, but my vehicle was just over the mileage limit at 167,000 miles. The dealer denied any goodwill assistance. A federal class action lawsuit (XXX v. American Honda Motor Co., Case XXX) has been filed over this same engine defect. Safety concern: Coolant leaking into the cylinders causes engine misfires and can lead to sudden loss of power while driving. An engine misfire or stall at highway speed creates a clear crash risk. This is not normal wear — it is a documented design defect that Honda has attempted to correct with revised parts in later model years. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jul 30, 2026 · CA

Evaporator failure in Honda Civic 2018, causing upwards of $2,000 for repair. This is a major safety issue that in extreme heat (such as california weather) can cause driver fatigue, and electrical failure from overheating as well. I personally was not covered under the Honda extended warranty for the condenser seal replacement because my evaporator was also not working. Especially as someone who is working in my car most of the time, driving between facilities, I need to have functioning air conditioning for my own safety. Multiple times now I have experienced nausea and fatigue while driving, with no remedy other than parking at a store and sitting in the AC until I could cool off. This is not right, and Honda is not being helpful with solving this issue that should be covered. I first discovered this in early 2025, got it fixed through an extended warranty, and now my AC has failed again because of the evaporator failure. No warning lights, problem has been confirmed by a dealer.

Filed Apr 25, 2026 · Engine · FL

The component or system that failed their malfunction is the evaporation system in the Honda vehicles especially after 2017 that regarding the R – 1234YF refrigerant - yes it has been confirmed by the dealership that the evaporator is leaking inside the car, but it is a known issue that warranty only covers the condenser in front of the car which also leaks. My problem is is since both equally run the same R – 1234YF refrigerant this type of refrigerant is known to cause corrosion and pinholes within the condenser and evaporated tubes leading to further issues with AC and cooling problems. There are no warning lights when it comes to these issues, which also pushes a further problem. If you were to go to any Honda dealership or ask, usual people who have condenser issues it could usually and most cases lead back to the evaporator, which also has systematic problems due to Hondas negligence and they knew about this refrigerant because they released it in 2017 to all the models that run the R – 1234YF refrigerant the main problem is the evaporator is supposed to suck out hot air from the car, but if it doesn’t do that and the car can have overheating problems, or it can cause dangerous heat inside the car, causing extreme sweating or even death in certain cases

Filed Apr 24, 2026 · Brakes, Electrical · CA

I was driving my car home from work and many warning lights lit up on my car dashboard (brake problem, engine problem, uphill start, steering problem) etc.. I got off the freeway and my car dashboard lit up and notified me “to pull over to a safe location because my car needle (temperature) was on high. I pulled over to a safe location and opened the hood and noticed that the antifreeze coolant compartment was empty) my car could have caught on fire because there was no coolant inside the compartment. After I got home and filled the car with coolant I placed cardboard under the car engine to see if the coolant would leak. There are no signs of leakage. I took my car to my mechanic and he told me that he couldn’t fix the problem and suggested I call Honda USA customer service. The mechanic told me that the problem is with the “head gasket” and that the coolant does leak into other parts of the engine. He didn’t charge me anything for the inspection and added coolant to my car. I called Honda USA customer service and they told me that there are “no recalls” regarding coolant leaks and head gasket problems. I googled problems with “Honda 2016 civics and learned that there is a problem that exists and it’s very costly to fix. I also learned that Honda was sued in Canada and Honda settled with customers regarding this problem. Honda USA simply told me to take my car to a Honda dealer and ask for an “inspection” I asked if they would cover the cost and they didn’t not say they would pay for the inspection. This is a manufacture problem that occurs after a Honda Civic has gone past 70,0000 miles. People still complain about this issue and wonder where the coolant in the car is leaking and where is the coolant going into since the coolant is not visibly leaking. The coolant is making its way within the engine and causing more problems in my car. I have never had a problem like this one. This is the second time that the coolant inside my car leaks into the engine.

Filed Mar 3, 2026 · Acceleration, Driver assistance · KS

Cruise control suddenly stopped working along with 5 warnings on dash which indicated to take vehicle to Dealer. This occured out of the blue, at 80,000 miles, with no prior indication of a problem and after a steering recall about months ago in August. Dealer says the power steering rack motor and plugs have melted. They claimed they had no idea how. Dealer wants approx. $10K to fix, wants me to replace the Steering rack and motor along with entire Wiring harness. this Assembly is about 3 inches from the muffler and a flimsy small heat guard. There are no signs of a fire, this is an overheating issue caused by poor engineering.

Filed Dec 16, 2025 · Airbags · 156,000 miles · TX · crash · 1 injury

The contact owned a 2011 Honda Civic. The contact stated that while attempting to park in a parking lot, he was blinded by the sun and collided with the circular concrete base of a parking lot light on private property. The contact mentioned that the engine was revving high. The air bags did not deploy upon impact. The contact was rendered unconscious by the impact. The contact sustained a cracked sternum, rib, right shoulder, back, and hip injuries, and also aggravated a prior spine injury. The contact stated that he observed coolant leaking from the radiator on the ground under the vehicle. Medical attention was required for these injuries. A police report was not filed. The vehicle was towed to a dealer, where the vehicle was diagnosed that the radiator was destroyed and the vehicle was deemed totaled. The manufacturer was not notified of the failure. The failure mileage was approximately 156,000.

Filed Nov 20, 2025 · Transmission · TX

Honda CVT transmission fluid seal leak cause by failed torque converter. Car has a perfect maintenance history, all fluid changes done on time with Allen Honda at Bryan Texas including filters associated. Car is garage kept, not driven hard. Always driven in economy mode for smooth efficiency. Failure occurred at 86,165 miles. Significant enough I am reporting this, as it is a safety issue, however don't know if other Honda civics have had this issue. A normal CVT transmission should last 150,000 miles before issues start according to manufacturer (Honda) who built the car. Two photos attached displaying the leak and puddle on my driveway. Leak is a slow drip, fixing it in the morning at a shop which will put me out of almost $3000 not under warranty because car is 6 years of age instead of 5 years. Honda needs to be made aware this is a serious safety concern, had I not caught it, it could have led to crash possibly, or fire from overheating. Leaking areas circled in red. Car currently not drivable, having to tow it in the morning to replace failed parts.

Filed Oct 14, 2025 · Engine, Fuel system · CA

Blown Head gasket failure due to coolant leak into cylinders Evaporator Leak for A/C due to condenser and compressor shaft.

Filed Oct 10, 2025 · Engine · OH

The engine gasket failed, leaking coolant into Cylinder 3. This created misfires while the vehicle was driving, leading to unpredictable loss of power while driving. Eventually, the coolant purged unbeknownst to the driver and created overheating conditions while driving which could have led to complete engine failure on the road. This behavior was confirmed and reproduced by an independent shop, WenMac Repair, in Hardin County, Ohio. They replaced the spark plugs and coils, thinking the misfire was not necessarily related to the head gasket. The vehicle was then taken to Honda Development and Manufacturing of America, LLC's official repair center for Honda Associates attached to Honda's Marysville Auto Plant 10/1/25 and diagnosed by a Honda master technician. My fiance and I both directly work for Honda. It is currently having the head gasket replaced at a cost of $2,700.00 plus taxes. The vehicle is still in the shop. The failure was observed on vehicle first around 150,000 miles.