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What 134 owners told NHTSA about the 2021 Honda Civic Si

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (134)Crash / fire / injury (6)Steering (57)Driver assistance (32)Brakes (18)Electrical system (17)Lane Departure (11)Airbags (8)Speed control (6)Engine (5)Fuel system (4)Seats (3)

32 of 134 complaints match · Driver assistance · clear filters · page 2 of 2

Jun 10, 2022Driver assistanceLane Departure

Was merging onto the crossover lane and it senses the water barrels by the wall as you go slightly left in the lane it doesn’t seem to understand that and pulls you toward the wall and hits the auto brakes almost causing an accident. This was in the 10 freeway by morongo and it has happened multiple times. I have taken those assist programs off as it’s almost killed me

NHTSA ODI 11468636

Jun 9, 2022Driver assistanceLane Departure

I’ve had multiply times where my dash with start indicating I need to break while I’m driving an will break for me while on the freeway or street with traffic. For the lane departure my car will just start turning out of a lane there was two incidents where I almost hit the wall divider on the Freeway from my car almost turning me into it.

NHTSA ODI 11468518

May 31, 2022Driver assistance

Automatic Emergency braking has gone off twice in 1 month on it's own. No car in front of me and the brakes went off and the "BRAKE" light went off on the dashboard. Yes, my safety was put at risk. I am not seeing any recalls for this Honda but I have read that this is an ongoing problem.

NHTSA ODI 11466807

May 28, 2022Driver assistance

Driving home from work. Cruise set at 73mph. I had just passed another car and was about 600 yrd in front of them on the PKWY, when the car just started breaking and ding, I get multiple warnings on the dash as I'm trying to get out of the way of other vehicles. the car drove normal the next 5 miles under my control but the dash is still lit with a Collision Mitigation system problem, Adaptive Cruise Control Problem, Road Departure Mitigations system problem, Drive Carefully systems initializing problem, Brakes system light. I'll note that there was not bad weather, there was no rain or snow. it was 80F. There was no impact, accident, etc.

NHTSA ODI 11466489

Apr 9, 2022Driver assistance

Car will randomly hit the brakes when adaptive cruise control is on. It will hit the brakes even though it doesn’t detect anyone in front, it will slow down a good 10-15mph before speeding back up.

NHTSA ODI 11460227

Feb 28, 2022Driver assistance

I was driving at 55 mph on a clear day with no vehicles or other obstacles in front of my car when the collision mitigation braking system (cmbs) activated and stopped the car suddenly.

NHTSA ODI 11454439

Feb 25, 2022Speed controlDriver assistance

MANY times I've pressed the gas after a full stop and had the engine roar in response while the car only moved forward a few feet rather than at full speed. My life is in danger if I'm trying to make a turn across traffic when I have a space to do so and I CAN'T make the turn SAFELY because the car has "stalled" by not moving forward quickly after I let go of the brakes. It's a brand new car, and I took it to Honda. They said they couldn't replicate the incident. Since it happens sporadically, I have no idea what causes it but I DO know that it's VERY dangerous. Another issue happens when I'm driving in cruise control. Another car is in a turning lane, and my car will slow down abruptly. The car is in the NEXT lane, not in my lane, so having my car suddenly slow down is very dangerous as I can get rear ended. Again, this is dangerous.

NHTSA ODI 11454186

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Working with the data? Download all 134 complaints as CSV · fetched from NHTSA July 19, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2021 Honda Civic Si verdict →