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Discussion Starter #1
Hey all. Just a few days ago, a couple minutes into my drive I got a “check” notification for three systems simultaneously: emissions system, power steering system, and VSA system. No obvious causes, car still seems to be running fine (though it is forcing traction control off, likely due to whatever issue the VSA system is throwing). I wasn’t doing anything out of the ordinary when these lights came on. My car is essentially bone stock: 2012 Si (coupe), with the only ‘mod’ being a Hondata FlashPro (running the Hondata stock reflash) and some aftermarket lights. I’ve already tried swapping the tune back to Honda’s stock one but the lights immediately came back. After a bit of searching, it seems I’m not the only person that has had these three lights turn on simultaneously... Many other users suggested it’s tied to aftermarket HIDs being installed without a relay/harness. I have aftermarket HIDs installed (I believe these ones, 9005: https://www.amazon.com/dp/B01H6NZ6F2/ ) without a relay/harness.

Do you think this might be the issue I’m having? Would installing a relay/harness potentially fix my problem? If so, what relay/harness do I need/should I get?

Something like this: https://www.theretrofitsource.com/hd-relay-9005.html or would something cheaper like this work: https://www.amazon.com/dp/B01CRVFKZY/ ?

I’m pretty clueless when it comes to car stuff so any help would be very much appreciated. Is there any way to test if these might be a good fix (for example, could I just disconnect my lights and see if the error lights go away? Or would that not work?)?

Any other suggestions are very much appreciated.

I’ll try to pull error codes with my flashpro tonight, but when I quickly checked I didn’t see any error codes (maybe I’m doing something wrong? Had it hooked up like I was uploading a tune and clicked “error codes” and it was blank).

Hopefully this is the right place to post this. Many thanks in advance!
 

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Discussion Starter #3
As always; start with the battery.
Make sure the battery is good by having it fully charged, then load tested.
Make sure all the battery cable connections (both ends) are clean and secure.
Not sure how to load test a battery (I assume I’d need some sort of equipment? A voltmeter?), but all of the connections look clean and secure from what I can tell. The battery is pretty new as well - probably about 7-8 months old. Purchased from Costco.

Any other suggestions would be really really appreciated! I want to order a relay/harness but I’m still unsure of what kind I need exactly - if anyone can figure it out based on the aftermarket lights I installed, I would very much appreciate it!
 

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You can go to one of the auto parts stores and have them test it for you. Pretty much anyone who can sell you a battery can test it in my experience.

Have you tried changing out the HID for standard bulbs to see if that clears the issue?
 

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Discussion Starter #5
You can go to one of the auto parts stores and have them test it for you. Pretty much anyone who can sell you a battery can test it in my experience.

Have you tried changing out the HID for standard bulbs to see if that clears the issue?
I haven’t tried changing them out yet because it’s a fairly involved process and I wanted to rule out other options first. Do you think simply disconnecting them would be enough? Or would I have to swap lights to really test it?

I finally grabbed an error code from my car - P0301 Cylinder 1 Misfire Detected. I’m assuming this is why all of these lights came on, but I still don’t see how a cylinder misfiring would interfere with power steering or VSA... regardless, it’s something to go off of. A quick google shows that this is usually caused by a bad spark plug.

What are your recommendations? Should I bring it to a Honda dealer and tell them what I know (difficult because most people can’t just pull codes from their cars... I only could because I have a Hondata FlashPro)? Or should I play dumb and just have them take a look at it?

So many questions but I appreciate all of the help!
 

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Your car is out of warranty, plus it sounds like you have hacked the ECM.
So you have nothing to gain by "playing dumb", as either way you are going to pay.

Does your car have any other mods, like light flywheel?

If you are up to it troubleshooting a bad plug or coil is as easy as swapping the #1 plug with say #3.
Clear the code and drive the car. If the problem switches to P0303, you found the problem with the plug.
If not; you swap the coil and repeat.
Beyond that you will need to get the full troubleshooting off the Honda web site.
 

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I had something like this happen to me recently. Getting misfire codes as I dial in my new injectors then I came out to my car after leaving it idling while collecting Data and it was lit up like an Xmas tree. Luckily I had my scanner with me and was Datalogging at the time. Hondata didn’t pick up the code but my scanner picked it up as a Honda specific code I think it was 01-83 ecu lost connection with pcm or something along those lines. I reset it and drove home. Once I got my injectors dialed in I stopped getting the p0300 codes and never got the 01-83 code again. You can disable your misfire detection in Hondata if you are in a pinch and trying to pass inspection. Basically I think the cars freak out and just throw random codes sometimes especially on tunes cars. Been seeing a lot of p0128 crap lately too. I’m not worried about it because I know my car is not having these problems. If you are worried about it there are tuners that will do free data analysis for you and help point you in the right direction. Steve and the dudes at E-Tunez have helped me out a bunch of times and I wasn’t even originally tuned by them.
 
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