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Check engine light and green flashing key light are on and the car is in limp mode with lights and gauges not working

Tiny
LMOSS84
  • MEMBER
  • 2002 HONDA CIVIC
  • 1.7L
  • 4 CYL
  • 2WD
  • MANUAL
  • 90,000 MILES
Hello, my car listed above is a coupe and when I was driving it all of the sudden the temperature gauge and tachometer stopped working in addition to check engine light and green flashing key light come on. The car sounds like it’s in limp mode and sounds like crap while idling. Again this all happened just while driving. I tried replacing spark plugs and coil and replacing the key so far no luck. If anyone could help that would be great thanks!
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Saturday, March 13th, 2021 AT 7:00 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Let's start with getting the codes. Here is a guide that will help with this:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

The key indicator is the theft system so if that is on I would not expect the vehicle to start. Is there a history to this? Has the ECM been changed recently?

Also, we need to test the battery and alternator just to make sure we are not dealing with a load shedding issue. That will not cause the vehicle to run poorly but it will cause some of the other issues you are seeing. I suspect we have multiple issues but let's start with codes and go from there.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

https://www.2carpros.com/articles/car-battery-load-test

Let us know what you find with this. Thanks
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Wednesday, May 19th, 2021 AT 1:40 PM

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