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The immobilizer light was on (green key flashing) and will not start?

Tiny
TREVOR FRIDENMAKER
  • MEMBER
  • 2007 HONDA CIVIC
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
First, I got off work and went to my friend's house. Before I left, I popped the hood to check my coolant level. After leaving there my car wouldn’t start and the immobilizer light was on (green key flashing) but after I tried a few more times and locked the doors from the button on the inside it started, and I drove home. I made it home fine but now it’s doing the same thing again where the green key is flashing, and it won’t start. I don’t know if I knocked something loose when checking coolant or what. Also, my key fob lights up but doesn’t do anything when I press any of the buttons.
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Monday, October 2nd, 2023 AT 1:33 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
I have seen both the immobilizer key sensor go out or the MICU, you should do a CAN scan to see if any codes are stored.
You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Here is how to check out the immobilizer key sensor which is probably the issue and in case code comes up for it and I have included the alarm wiring diagrams so you can see how the system works. Check out the images (below). Please let us know how it goes.

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Monday, October 2nd, 2023 AT 11:41 AM

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