What 134 owners told NHTSA about the 2021 Honda Civic Si

Car is constantly wandering and completely impossible to keep straight at highway speeds.

NHTSA ODI 11518549

Steering wheel tries to stick in place randomly. Does not happen daily but has happened multiple times. The only way to make it stop is to stop driving the car for a few hours.

NHTSA ODI 11513124

the vehicle has brakes with out cause. Two times I was on the street no cars in sight and the car just brakes without notice or cause. Then it happened again yesterday on the freeway. It was raining no cars close and it just brakes again in the middle of the freeway.

NHTSA ODI 11511661

My car has about 24k miles on it and at about 20-22k I started to notice something wrong with the steering. I was on an off ramp at about 45 mph and encountered a steering overcorrection that I didn't feel I caused on my own without another factor related to the vehicle being present. Since then I have been paying more attention to it and have the following to report. So far I only experience it when the vehicle is hot or warmed up and it feels like the steering wheel is sticking and then when you finally get it to break free you end up with a steering overcorrection or like a swerve that you didn't intend to cause due to your normal human driving inputs. There is definitely something going on here, my car did not do this for the first 20k miles and now it's essentially every time I drive it long enough to get warmed up. I hope that NHTSA is able to help us out here.

NHTSA ODI 11510243

Rodents chewed thru the main computer cable while car was parked in our car port. When I went to start car it started but immediatley the warning lights on dash began flashing that the road assist features, brakes and steering were not operating.Called road side assistance for a tow to Arrowhead Honda were they replaced main computer cable and reprogrammed computer. This is the second time this has happened. I think the manufacture should change the exterior coating on the cable should be changed to a material that rodents are not attracted to.

NHTSA ODI 11489633

While accelerating on a multi-lane freeway, the dashboard speed suddenly indicated 0 MPH and flashed warnings for power steering, emergency braking, suspension, and many other systems. Steering became almost impossible to control, with no resistance felt through the wheel, and small movements of the wheel resulting in unpredictable jerky movements of the vehicle. It was almost impossible to control the vehicle while exiting the freeway and coming to a stop. OBD scanner pulled only one code: U0416(68) Invalid data received - vehicle dynamics control module

NHTSA ODI 11485983

Honda uses a soy-based insulation on the wires in its new cars. We have a brand new, less than 4,000 miles, Honda Civic. I recently went out to start it in the morning and received warning lights on virtually ALL of the systems you list. Why? Apparently rabbits are attracted to the soy-based insulation and will chew it. Honda knows about this problem -- they have had class action lawsuits filed against them already because THOUSANDS of consumers have had their Hondas disabled when rodents chewed the insulation on the wiring harnesses. I had to have the Honda towed into the dealership here in Helena, Montana because it was COMPLETELY DISABLED -- including no power steering. Notably, the service technician told me "it's a common problem -- rodents like the soy insulation." The cost to repair the 18" wire harness was $350.00!! Rather astounding sum to unclip both ends and clip in a new wire harness. But here's the rub. Honda knows about this problem and have already had class action lawsuits filed against the company for the obvious design and manufacturing flaw. If anyone doubted that, all they have to do is ask what Honda does to deal with the problem. The answer: They sell and install "hot chili tape" that they wrap on the wire harness so rodents/rabbits won't chew it. Obviously, they wouldn't need to produce their own chili tape if there wasn't a known -- well known -- problem with their wiring insulation. This is a very real problem for consumers because virtually everywhere on the planet there are rodents and rabbits. So if you park your Honda anywhere, you may wake up to find it no longer works and you will be stranded. This is particularly a problem in rural areas such as Montana, where dealerships can be hundreds of miles away. Honda does not warn consumers of this problem -- although they do laud their "bumper-to-bumper" 30,000 mile warranty. Oddly enough, the wire harness is located between the bumpers...but the warranty does NOT cover this.

NHTSA ODI 11471885