2020 Honda Civic

The turbocharger bypass control solenoid valve circuit on my 2020 Civic Si has developed an intermittent open, setting DTC P0035. I diagnosed it myself: the solenoid coil measures 45 ohms and functions when commanded via bi-directional scan tool, and supply voltage is present at the harness connector. However, the control circuit reads approximately 9V in the off state when it should be near ground, and the reading fluctuates when the harness is flexed near the connector — indicating a partial break in the wiring consistent with vibration fatigue. This is a safety concern because the ECM fault cascades to other systems. My scan report shows U0401-68 in the ABS module and U0416-68 in both the EPS and Integrated Driver Assistance modules. The result is that VSA stability control is disabled. I first noticed the problem because warning lights appear during hard cornering — precisely when stability control is most needed. Honda has acknowledged this exact failure mode. Service Bulletin 18-044 (NHTSA ID 10142655), issued June 2018, covers the 2017 Civic Type R for DTC P0035 and states the cause as: heat and the natural frequency of the harness cause the coupler wire to oscillate, producing an open circuit to the turbocharger bypass control solenoid valve. The remedy was a replacement engine wire harness kit. The Si shares the same L15B7 engine family and the same bypass control solenoid circuit, but no campaign covers it. Owner forums document numerous P0035 wiring failures on non-Type-R 1.5T Civics. I am requesting that NHTSA consider whether this defect and its effect on stability control warrants a safety investigation and expansion of the existing remedy to other 1.5T Civic models.

The contact owns a 2020 Honda Civic. The contact stated that while driving at an undisclosed speed, the compressor shaft failed, and the shaft seal caused further damage to the compressor and caused an additional failure. The contact associated the failure with Technical Service Bulletin: 23-039. The dealer was contacted and diagnosed the vehicle with compressor failure. The vehicle was not repaired. The manufacturer was made aware of the failure and stated that the warranty only covered the shaft seal and not the compressor. The failure mileage was approximately 166,000.

The contact owns a 2020 Honda Civic. The contact stated that while driving at an undisclosed speed and making a turn, the headlights failed to operate properly and failed to provide adequate illumination while driving. The dealer was contacted, and headlight failure was repaired; however, headlights were not recalibrated. The manufacturer was not made aware of the failure. The failure mileage was approximately 76,000.

The contact owns a 2020 Honda Civic. The contact stated that while driving at highway speeds, the steering wheel was sticking with resistance while turning the steering wheel to the left. The cause of the failure was not yet determined. The manufacturer and local dealer were notified of the failure, but no assistance was offered. The contact was informed that the vehicle was not under a recall associated with the failure. The failure mileage was 120,000.

on 7-28-26 After filling my vehicle with gas at the next red light, all lights on dashboard went on flickering warning (Christmas tree effect). on 7-29-26 After researching online Roadside came out and did Battery and alternator test that passed. I did hard reboot from instructions I found online and after several attempts the lights cleared twice, the morning of 7-30-26 when leaving for work the flickering lights came back on. Vehicle had a slight tremble but cleared after a few seconds while vehicle warmed up. I went to get the battery checked at the shop and it passed also had air filter changed. Lights still on, car is running fine, but I feel unsafe to drive and have an appt at the dealer for a diagnosis check on 7-31-26.

The A/C went out on this vehicle. The A/C only worked half way in the car. It would only cool the passenger side and not drivers side. When I took it in to get it fixed, they said it was the condenser. There was a recall for the compressor shaft seal but not the condenser. They replaced the condenser and compressor shaft seal. As I checked the Internet I found a recall for this problem in Canada but not in the U.S. I asked Honda about it. They said it was VIN specific right now unless enough people complain about this problem. If it happened in Canada it should be dealt with here. According to my search there are others in the U. S.that have had this problem. How many complaints does it take before this is dealt with?

At least a half dozen times the car would brake automatically when nothing was in front of the car. The BRAKE warning light would appear on the dashboard as the car abruptly slowed down. The car slowed down but never came to a complete stop. This happened at various speeds. Once on the freeway at high speeds, 3 times just before an intersection where I had a green light and other various times. I brought the car to 2 different dealers. They could not replicate the problem so they said there was nothing they could do. The courtesy car driver who gave me a ride said they occasionally experience the same thing in the courtesy car.

On passenger side, 4 of 5 wheel hub bolts (lug bolts) broke off during driving. The lug nuts did not come loose. The bolts actually broke off with lug nuts attached. This caused the wheel to separate from the car while driving. This caused an accident and $5,500 damage to the car. There were no warnings from the in-car information center.

I reported this issue to insurance. The facts are that when I was watching a family member’s toddler, I went to my vehicle to grab a stack of papers. While holding her, I reached in and grabbed the papers sitting directly on the back seat of the coupe vehicle (I.e., easy to reach). Upon grabbing the papers in one hand and holding her on my left hip, I shut the drivers side door and began walking toward the home. Immediately, I heard an odd sound like a rustle or possibly an animal scurrying. I looked around confused because I hadn’t seen anything and it wasn’t too dark. Then I looked closer and the entirety of my back windshield was shattered into a billion pieces leaking into my back seats and onto the car seat placed there for when I frequently pick up the toddler. I can’t help but think of what would’ve happened if she was in her car seat and the glass shards (which were many, sharp and permeating through each crevice and likely will remain until somehow discovered or hurting someone) would’ve fell there. Many honda owners experienced this issue of combustion in the rear windshield. It’s not safe or right. A recall should be made.

I am the second owner of this year and model of Civic. I initially bought it back in 2021 with 14,000 miles on it. The clutch slipped and blew at around 29K miles in 2023. I brought it into a honda dealership and they were at least able to replace the clutch with the SAME CLUTCH under warranty but now it's 2026 and the clutch is going out again. Clutches should not be going out this frequently. I've driven several manuals and if you were to look up this specific year and model, it is a known issue across several forums online and youtube videos for having a "weak clutch". Despite it being a known issue, Honda refuses to announce a recall or make right by their customers who bought this specific year and model. I along with other owners of this specific year and model had our "Good Will" declined after the warranty period ended; how convenient for Honda. It would've essentially cost at least $10K in repairs for an average owner over 5 years on a relatively brand new car. That's more than 30% of the car's worth and value at MSRP.. They keep saying that all of these issues and feedbacks are being reported to the NHTSA but I honestly believe they're waiting for it to be long enough for warranties to expire and hop they can sweep it under the rug. I've driven Hondas all of my life and have loved their cars but their refusal to do right by this well known issue is leaving a sour taste in my mouth.

The vehicle has experienced a complete failure of the A/C condenser unit due to refrigerant leaks originating from manufacturing defects in the tube walls. This matches the exact physical failure described in Honda Service Bulletin TSB #19-091. However, the manufacturer is refusing coverage because this specific VIN falls just outside their current arbitrary cutoff list. This component failure directly impacts vehicle safety by disabling the vehicle's capability to dehumidify the cabin and clear a heavily fogged windshield during sudden humidity or temperature changes, causing an immediate visibility hazard.

I am writing to file a complaint regarding the air conditioning system failure in my 2020 Honda Civic Sport. The air conditioner in my vehicle began blowing hot air instead of cold air. I took the vehicle to Honda for inspection and paid $545.15 to have the system recharged and dye inserted in order to diagnose the issue. After this service was completed, I was informed that the evaporator has failed and needs to be replaced. I was then quoted $2,475.13 for the repair. While researching this issue, I discovered that many other Honda Civic owners have reported similar air conditioning problems involving the evaporator and AC system. I also became aware of a 2021 letter involving American Honda Motor Co. and Honda dealership personnel regarding evaporator leaks in vehicles with VIN numbers beginning with 2HG or 19X. The letter stated that Honda was researching these vehicles in an effort to better understand the issue. Given the number of similar complaints and Honda’s apparent awareness and investigation into evaporator leaks, this appears to be a potentially widespread defect affecting these vehicles, even when properly maintained. The failure of the air conditioning system has caused significant inconvenience and financial burden. I believe this issue should be investigated further, as it may indicate a defect in the vehicle’s air conditioning system. I respectfully request that the NHTSA review this matter and investigate whether the evaporator failure in the 2020 Honda Civic Sport is a recurring manufacturing defect that may warrant further action or assistance for affected vehicle owners. Thank you for your time and attention to this matter.

To Whom It May Concern, I am writing to formally address a serious issue regarding my recent service experience at Freeway Honda and the unfair handling of my case by American Honda concerning my Honda Civic (VIN: [XXX] ). On January 2, 2024, I brought my vehicle to Freeway Honda due to recurring air conditioning issues. My service advisor, Erick Zermeno, informed me that the system had three leaks: the condenser, the compressor, and the evaporator. While he acknowledged that the condenser and compressor were covered under warranty, he stated that the evaporator was not and quoted approximately $1,900.00 for the repair. Furthermore, he refused to repair the warranty-covered parts unless I agreed to pay out-of-pocket for the evaporator repair at the same time. When I declined, the manager, Jamie, required me to pay a $175.00 diagnostic fee to have my vehicle released, despite the fact that the inspection identified defects covered by the extended warranty. Seeking a second opinion, I visited Norm Reeves Honda in Irvine on January 31, 2024. Their technicians determined that only the A/C condenser and compressor were leaking. They repaired both parts at no charge under the warranty and found no issues with the evaporator at that time. It appears Freeway Honda attempted to charge me for an unnecessary repair and wrongfully collected a diagnostic fee for a warranty-related inspection. This matter has been reported to the Bureau of Automotive Repair. I previously filed a complaint with American Honda (Case #XXX) and requested a full refund of the $175.00 fee. Later on, the defroster and the A/C started to cause problems. On October 8, 2024, the A/C failed again, and Norm Reeves Honda confirmed the evaporator was leaking, resulting in a repair cost of $1,797.79. Although American Honda initially offered a partial reimbursement of approximately $960.00, which I declined due to the ongoing nature of these failures. Now, they rescinded the offer. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Steering system failed and started to jerk -- Contacted Honda and while there was a recall on the NEWER models, we experienced a similar issue on our 2020 Civic.

I have owned my vehicle for nearly 18 months and absolutely NO ACTION has been taken on Honda's part to remedy this solution with the capacitor in the circuit board of the front passenger seat weight sensor. Tired of waiting! I want results. This could lead to the front passenger frontal and knee airbags deploying unexpectedly.

The contact owns a 2020 Honda Civic. The contact stated that while operating the vehicle, the steering wheel became sticky and jerked while turning in either direction. The vehicle was taken to the local mechanic to be diagnosed, and it was determined that the electronic steering rack needed to be replaced. The vehicle was not repaired. The manufacturer and local dealer were notified of the failure, but no assistance was offered. The contact was informed that the VIN was not included in NHTSA Campaign Number: 24V744000 (STEERING). The contact stated that the vehicle had experienced the failure listed in the recall. The failure mileage was 64,000.

The contact owns a 2020 Honda Civic. While driving 50 MPH on the highway, the passenger’s side wheel felt as if the wheel was about to detach, causing the vehicle to veer to the right. The vehicle returned to normal functionality and operated as designed. No warning light was illuminated. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The contact related the failure to NHTSA Campaign Number: 25E071000 (Wheels). The approximate failure mileage was 63,000.

The contact owns a 2020 Honda Civic. The contact stated that while driving 60 MPH, a bobcat crossed the road, and the bobcat was struck by the vehicle. The contact stated that there was extensive front-end damage and undercarriage damage to the vehicle. The driver’s and passenger’s side air bags did not deploy. The contact was unsure whether there was a warning light illuminated. The contact was not injured. The vehicle was driven to a gas station, inspected, and then driven back to the residence. However, the vehicle failed to accelerate above 40 MPH. The vehicle was taken to a collision center for repair. The contact received a call from the collision center and was informed that all the air bags in the vehicle had been removed and that the wires were cut and twisted together, which led the sensors to believe the air bags were still connected. The vehicle was not repaired due to the cost. The manufacturer was not notified of the failure. The failure mileage was approximately 78,000.

On 04/2025 the car was driving fine with no warnings or indication of a problem. Turned my car on at a parking lot and as I was driving away the car suddenly stopped, all the warning lights started coming on. I was able to turn it back on and drove it to a nearby dealer. I am the second owner of the car and Honda dealer said the fuel pump had already been replaced due to a recall. This time they said it was a secondary fuel pump that was the problem and the very expensive repair was done. Fast forward to 2/2026 and the same thing happened. This time it was scarier as it shut off as a car was backing up from a parking spot. Fortunately, the driver saw the car and was able to stop before running into me. The car failed to start, and I had to get it towed. Could not tow it to the dealer since it was late in the evening. The next morning, the car did start, but all the warnings continued to flash on the dash. The car is being towed to the dealer where the "repair" was done. All this happening within a year of repairs. This should be a recall and Honda should refund my initial repairs as this is happening to other drivers as well.

Clutch started slipping all of a sudden. Check to see if it was under warranty said the warranty had expired because the car was over 36,000 MI did not know about the extended clutch warranty at the time that Honda was extending it due to defective parts so we replaced it ourselves. Upon tear down it was discovered that the clutch disc was only about 30% worn down there were no hot spots in the flywheel or the clutch cover so the problem was related to the holding force of the clutch cover have we continued to drive the car the way it was it would have burnt it up because it would barely move. I've been in Autotech for 50 years never seen a clutch slipping with this much material left on it and the parts in this condition it is obviously a defect with the part and I submitted a claim to Honda and they denied it had I had known Honda would have taken care of it I would have brought it to them.