2020 Honda Civic Electrical System Problems

vehicle turns on in to accessory mode, does not allow me to turn off vehicle sometimes car turns on at night by itself, alarm goes off when parked and locked

The air conditioning system in my 2020 Honda Civic EX has a refrigerant leak at the evaporator assembly, causing very weak or almost no cooling even when set to the lowest temperature settings. This happens consistently, including in moderate to hot outside temperatures, making the cabin uncomfortably warm during drives as it could get pretty hot in inland southern California. The A/C evaporator assembly is the failed component, and the part remains in the vehicle available for inspection if requested. This issue creates a safety risk because reduced visibility from window fogging in humid or rainy conditions (due to lack of proper dehumidification and cooling) can impair safe driving. In extreme heat, it also increases driver fatigue and distraction from discomfort. The problem was confirmed by a Honda dealership through diagnostic testing, which identified the evaporator leaking refrigerant. They previously repaired a related condenser leak under warranty, but the cooling issue persisted and was later traced to the evaporator. The vehicle has been inspected by the dealership (manufacturer-authorized) on multiple occasions for this A/C concern. No specific warning lamps or messages appeared on the dashboard related to the A/C system. This appears to be part of a broader pattern reported by owners of similar 2016-2021 Honda Civics, where condenser failures (sometimes covered by extended warranty) are followed by evaporator leaks, possibly related to the vehicle's use of R-1234yf refrigerant and system pressures. I recently received partial goodwill assistance from the manufacturer toward repair costs, but the issue highlights a recurring defect in the A/C system that affects cooling reliability. This car is driven by my 20 years old daughter as a commuter car to college and she is really suffering. I feel I am putting her at risk and need to get it fixed ASAP at whatever cost.

Q: What component or system failed or malfunctioned, and is it available for inspection upon request? A: BCM (body mechanical module) became faulty, causing car to turn on ignition by itself. Would be sitting in car with it off and the ignition would turn on causing issues with battery and gas consumption. Also in order to save that until it was figured out what was wrong I had to disconnect the battery causing multiple resets to my electrical system. Yes. Q: How was your safety or the safety of others put at risk? A: Would be sitting in car with it off and the ignition would turn on causing startling and issues with battery and gas consumption. Q: Has the problem been reproduced or confirmed by a dealer or independent service center? A: Confirmed and fixed so far by a small and independent electrical mechanic. Q: Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? A: No. Q: Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? A: No.

While driving on interstate highway, main dash display went almost completely dark. Could not see speed, warning lights, gas gauge, engine temp, etc. Pulled over to check out problem and "push to start" button would not turn off engine. It did on second try. Dealer diagnosed fault in gauge control module. Must be replaced.

The vehicle’s emergency braking system randomly applies the brakes even when the front is not obstructed. Front sensors are kept clear of any debris, dirt, or bugs. I went to Honda of El Cajon in El Cajon, Ca and they could not help me even though the service advisor admitted that another Honda CR-V driver had the same problem the same day. This is a safety concern as my car has applied he brakes while on the freeway and at stop signs at random. Honda has failed to acknowledge the issue.

The car cuts off while driving

Gas door opens randomly and it’s happened more than a few times now which is becoming a safety hazard especially because I drive 80 miles daily for work. Also my automatic brake senor is a hazard because it’s going off when cars or objects are farther away; which leads to the 3rd issue with my seat belts which is either to tight on the chest area and possibly choking me when the car automatically brakes when objects aren’t near or in close distance to my car

On [XXX], 2023, my car's electrical system malfunctioned, leaving me unable to restart the vehicle after stopping. I had to call my car insurance for roadside assistance, and their representative jump-started the battery, suggesting I replace it. However, on [XXX], 2024, the same issue recurred, causing the car to stall unexpectedly and fail to start while I was out shopping with my wife and [XXX] daughter. Fortunately, I was driving on local roads; I shudder to think what might have happened if I had been on the freeway. Again, I had to rely on my insurance's roadside assistance for help. The safety of my family and me was jeopardized, especially since this is our only vehicle, which we frequently use to travel with my infant. These incidents are documented in two insurance claims. My car is among those recalled for fuel pump issues, but I haven't been able to schedule a repair with the dealer due to no available appointments. The online chat support also refused to book an appointment for the same reason. Additionally, my car has always adhered to Honda's regular maintenance schedule. From March 2024 to May 2024, the car's display screen, including the mileage indicator, intermittently malfunctioned while driving. On [XXX], 2024, when the car stalled, the screen also indicated a brake system error. Finally, I want to report another issue with this car: the cooling system is no longer providing cold air, resulting in the interior temperature being consistently higher than the outside temperature, especially during the recent hot summer days. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The body control module is failing, read multiple posts online and Honda is not fixing it. My alarm goes off and I cannot turn it off, have to use my key. The vehicle powers up on its own into accessory mode when parked, vehicle off and no key fob in the car. This causes the alarm to activate, drains the battery and causes temporary safety features- collision warning, lane assist, cruise control etc to not work. As well as drains the battery. Honda has recalled this part on other models but not the 10th generation Civic.

See attached document for complaint

The contact owns a 2020 Honda Civic. The contact stated while driving approximately 35 MPH, there was an abnormal odor coming from the A/C. The contact stated that there was a dangerous chemical called R1234YF leaking into the cabin of the vehicle. The contact stated that the odor from the leak made his daughter sick. No warning light was illuminated. The vehicle was taken to the dealer and diagnosed with a leak through the evaporator in the cabin as well as a leak in the condenser and compressor. The vehicle was not repaired due to cost. The manufacturer was made aware of the failure. The approximate failure mileage was 49,000.

Was T bones September 3rd 2023 exiting the freeway by a Ford F-350. Injury to left side of vehicle mainly . Airbags not side airbags deployed. Went through insurance and was told to report it to the manufacturer. Due to this I now need double knee surgery as I have tears and fluid and now have spinal injury .

My infotainment center has repeatedly failed during operation. It is distorted while driving, freezes, stuck on previous screen display. This causes all safety features to be inoperable. I can’t see the camera back up display. I can’t see the map or upcoming exit/next direction. The Honda genius features are impacted by this. My vehicle suddenly thinks I am exiting while I’m driving and randomly slams on breaks with no vehicle or object in front of me, it jerks my wheel even though there is no car or barrier next to me. I have resorted to turn off all of the safety features due to the infotainment center glitches making my vehicle very unsafe to operate. I have been in several near miss single vehicle accidents. Picture added to show screen distortion and no direction listed. Should be displaying navigation and upcoming turn but is frozen and distorted.

Power windows rolled down on their own

The contact owns a 2020 Honda Civic. The contact stated while pressing the key fob to unlock the doors, the doors remained locked. The contact had to manually unlock the doors. The contact attempted to lock the vehicle with the key fob however, the doors failed to lock as needed. The vehicle was not diagnosed. The manufacturer was not contacted. The failure mileage was 28,000.

The AC condenser has been replaced twice along with the shaft seal.Which then caused my evaporator core to crack and is now leaking and gonna cost me two thousand dollars

Hello. I have a 2020 Honda Civic Hatchback Sport. The stock audio system makes a VERY loud crackle and popping sound before completely cutting out, this abrupt malfunction frightens me and hurts my ears. Additionally the malfunction of this audio unit may cause other safety problems because it is connected to the back-up camera which can freeze/reboot randomly when the electrical/software malfunction occurs. I listed the most recent incident date below however this problem has been intermittent since I purchased the car new in 2020. My car is now out of warranty and Honda refuses to address the issue even though it was present before 36,000/3 years. Thank you.

I was driving getting ready to switch lanes and all of a sudden my car made the beeping noise and slammed on the brakes on its own

Took vehicle in to repair recall. Was told recall was fixed drove off engine shut off in the middle off the hwy. After several attempts to get the car restarted finally able to drive back to dealership. Was told the new o ring broke. Was told it was fix but the recall is still unresolved and still causing engine shut off issues. No prior issue other than leaving key part off uncer car after routine oil change which caused undercarriage damages. That still unresolved. uncompleted repair and recall.

i have experienced multiple issues with the sensors since I've had this vehicle in December 2020. The sensor issues have caused my vehicle to shut down and slowly stop as I was driving on the freeway. The latest incident caused my airbag to deploy without any reason while I was driving slowly in a residential parking lot. It went off in my face and I suffered from hearing problems. I am fortunate that this incident did not harm anyone as it put others at risk from the airbag unexpectedly blocking my view and distracting me from driving. Although the dealership, Tempe Honda, repaired the other sensor issues, they refuse to repair the airbag issue. They are claiming that I need to have my insurance pay for the repair. I have had two mechanics inspect the vehicle and confirm that this is a defective airbag sensor that caused the airbag to deploy. I have not driven the vehicle since this incident as it is unsafe for me to drive. The vehicle is available for inspection at any time. I have contacted Honda on multiple occasions. They have Case #12968314 is my case number and every time that I call, the representative tells me that a Case Manager will call me but I have not received any calls. I also sent an email to Honda on 02 May 2022 detailing this incident that occurred on 14 April 2022.