I thought I would post this in case it would help someone else.
I have a 2018 with around 65k miles. A few days ago I got the cascading warning lights:

1. Hill start assist problem
2. Road departure mitigation system problem
3. Power steering system problem
4. Tire pressure monitor problem
5. Emissions system problem
6. Vehicle stability assist problem
7. Hill start assist problem

My car runs/drives perfectly fine before and after the lights so it seemed odd. I combed through these forums and saw the sensitive electrical system mentioned once or twice. I realized this only happened a short time after my wife had used the car and left the interior lights (passenger and dome) on over night. This is the original battery it came with, so pretty old. I put it on my trickle charger and once it said it was fully charged, I started the car up and no more warning lights.
So maybe try replacing or recharging the battery before doing injectors, etc.?

 

The pukey little #151R OEM battery would be more susceptible to this problem. When you do get around to replacing the battery seriously consider the much larger capacity #51R battery.

Also you might want to consider replacing the interior lights with LEDs which give off as much or more light and use less power.

 

I may have spoken too soon as I now have an Emissions System Problem warning on the dash. I've ordered a new battery tray and will replace with a #51R and see what happens.
Is there a good led interior package that people like?

 

maybe disconnect the battery, or reset codes with scan-tool?...might fix??...but honestly thank for posting the info. i did the battery swap....very easy

 

Just thought I'd share an update.
After my wife drove the car to/from work for about an hour and a half, I drove it to pick up a new battery. When I drove it, no dash lights. I swapped the battery anyway to a #51R since I had already ordered the tray. No lights and I've been driving it normally the last few days including a multiple hour (4/5) road trip over the weekend.
So I still think the low battery was causing it to throw all the codes.

 

And if the issues pop up again soon, then check your alternator.

 

Well, a day ago the warning lights came back on. I pulled the CEL codes and only get a P0301. I did check the alternator and it seems to have expected output. Battery was also fully charged. The car seems to run normally. When I actually unplugged the ignition coil on cylinder 1 the engine definitely stumbled. So I question if it is actually misfiring.
I think what I might do next is a valve adjustment since I've never done it (now at 62k) and there does sound like some clatter when the engine is running. I've read that it can throw codes when cold so maybe that is why the code is thrown but it seems to run fine?
I'll report back once I get it done.

 

So weird. Drove the car today and not a warning light in sight. I got my feeler gauges and plan on checking the valves tonight/tomorrow.
I'm approaching this as a sensor issue and not an actual issue with the car due to the intermittent nature of the warnings and the car driving normally.

 

The proper way to check for a coil problem is to clear the codes and then take the suspect coil and swap it with one on another cylinder. Then see if the problem follows the coil to the other cylinder.

 

Our 2019 Fit w. 88K mi. has 4 of these lights blaring at me, too. (TPMS, Engines, VSA and Steering) I don't know of any near-dead-battery-incidents.

Thank you for sharing your problem/solution! Is it simply: A low battery output activates all these warnings?
I'll try dis/re/connecting and see if it resets. I haven't seen any other battery/power issues, and my cheap OBD only shows power train and emission codes with vague web results.

 

Unfortunately, a new battery didn't fix this issue. It basically went away on its own.
It has come back a few times intermittently but seems to just go away randomly. The only annoying thing is I can't use lane keep assist, adaptive cruise, etc. When I pull the codes, they seem to be unrelated to anything with steering, tires, emission, braking, etc. So I've just been ignoring it when it happens.
I did try actually swapping the ignition coil between cylinder 1 & 2 but the next time I got all the warnings and pulled the codes, it was still cylinder 1. So not the ignition coil. I really have no idea but it seems like a faulty sensor somewhere or something.
I also checked valve clearances and everything seemed fine. I'm at 65k miles now, so maybe I'll change the spark plugs if it happens again. The odd thing is it drives perfectly fine with all the error codes and having a "misfire". Very odd.

 

i have the same problem. have you used an ODB2 reader?
have you passed an emissions test?

 

Yes, I do have an OBD reader. No, no emissions testing here.
I ended up changing the injectors and all codes went away. I had the car in for a fuel pump recall and had them initially try walnut blasting and then had them change injectors. I had already tried changing plugs and coils myself, with no effect. I was getting P030x codes and car had gone into limp mode a few times so I figured it was time to address it seriously. It was around $1500 but when I had looked myself, OEM injectors were around $1k and refurb/aftermarket weren't that much cheaper.