Green key flashing

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Aug 1, 2022

bookat

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Green key flashing

Quote:

Originally Posted by Grinderman

I'm no mechanic obviously but check your fuel relay and main relay circuit boards for cracks on the soldered points. Heat will cause them to expand and if they've been there awhile the intermittent heat and cold will crack the contacts. Reflow with a soldering iron. Also check temp control sensor, could be reading cold not hot. Does it crank or does nothing? If nothing check your starter solenoid, if it's copper it could just be hot which is a bad solenoid. You will know if you can jump across the solenoid. I had a Chevy and a Ford truck both do that. The Ford was easy to diagnose, the solenoid was separate from the starter on the firewall but on the honda its right with the starter on the left side of the engine. With the air breather apparatus off its easy to see and access.

I have the same problem, apparently this is a big issue with these cars and quite annoying. I replaced my starter and tested it, the solenoid is good. The green key is solid and goes after a few seconds. After i take the key out it blinks 5 times. Sometimes the car starts and intermittently it doesn't. I noticed it happens the most when outside temperatures are hot but it has it happened at night when its cooler as well. When this issue happens there is no crank at all but i hear a click from the relay and low hum sound. Brand new battery (tested), brand new alternator, replaced the black relay behind the glove box (03 Civic LX Coupe). I get the car to start after letting it sit for awhile and sometimes by tapping the relay behind the glove box (doesn't always work). Any ideas?

Last edited by bookat; Aug 1, 2022 at 03:45 AM.

Aug 1, 2022

bookat

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Re: Green key flashing intermittently

Quote:

Originally Posted by Colin42

Green key flashing is immobilizer issues, the computer is preventing it from starting.

It depends when its flashing. From what i understand if its continually flashing while the key is in that is an issue.

Last edited by bookat; Aug 1, 2022 at 04:06 AM.

Aug 1, 2022

bookat

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Re: Green key flashing intermittently

Hmmm, maybe this

still not sure though

Aug 1, 2022

Colin42

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Re: Green key flashing

Moved your posts to their own thread.
In the future create your own thread.

Green key flashing while trying to start is an immobilizer issue. Full stop.
Take it to the dealer.

Aug 1, 2022

bookat

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Re: Green key flashing

Quote:

Originally Posted by Colin42

Moved your posts to their own thread.
In the future create your own thread.

Green key flashing while trying to start is an immobilizer issue. Full stop.
Take it to the dealer.

Yea but my green key is not flashing when trying to start and I get no crank (i think immobilizer issue still gets crank). See my post above. What do you think the issue could be?