Reading "Hidden" OBD codes

2001 ACR · Post by **2001 ACR** » Thu Sep 25, 2008 5:30 pm

So I was browsing around faqs.neon.org and I ran across an article discussing OBD error codes.

Quote: http://faq.neons.org/faq/FAQ_ET.html#plugs

"Certain codes will set off the CEL while driving; some do not. It is a good idea to check for hidden codes occaisionally.

To read any OBD codes, perform the following sequence.

1) Cycle the ignition key ON-OFF-ON-OFF-ON within 5 seconds.
2) Count the number of times the 'Check Engine' lamp on the instrument panel flashes on and off. The number of flashes represents the code. There is a slight pause between the flashes representing the first and second digits of the code. Longer pauses separate individual codes. For example, flash-flash-flash [pause] flash-flash represents the code 32.

To cycle the ignition key ON means to turn it only as far as it takes to get the dash lights to respond. It does not mean to crank the engine."

The site then lists a bunch of different codes.

My question is, is this information accurate, or is it a load of bull? If it is accurate information, then this would be a really cool way to read codes that the CEL (check engine light) doesn't come on for...

03blackrt · Post by **03blackrt** » Thu Sep 25, 2008 5:35 pm

It's true for 1gn's. But on 2gn's it doesn't flash; it gives an alpha-numeric code displayed on the odometer readout.

Danteneon · Post by **Danteneon** » Thu Sep 25, 2008 5:37 pm

Yep, it works. I'm not 100% sure it works on all 2nd gens, but my guess is that it does.

This is something that Chrysler has used since the 80's.

*Edit* thanks, I forgot about the display change

Since OBD 2 scan tools have come down so much in price in the past few years it isn't really necessary to do that. Not only can you read the codes, but it gives you their description and the ability to clear them.

Post by **occasional demons** » Thu Sep 25, 2008 6:49 pm

IIRC this feature isn't available from '97-'99? on a few, if not all DCX vehicles. So if it doesn't work for you on those years, you will need a code scanner. I know Jeeps don't display the codes, but the cluster self diagnostic works. At least it's something.

NickKo · Post by **NickKo** » Thu Sep 25, 2008 11:43 pm

I once found a "hidden" code using a scanner on my '98, that did not show up as a CEL, or show up using the 'Key Dance'.

I don't know if 'hidden' cods applies to the 2nd gens or not.

- Nick