Quote Originally Posted by In-Tech View Post
Hi Tom,
I'm not 100% positive but I think that is retrieval of permanent dtc codes stored in non-volatile memory. I don't have any info
From the look of the code, it seems that just like mode $18 it filters by group:
PCM
Chassis
Body
Undefined
All

and by DTC status:
Warning lamp illuminated for this code
Warning lamp pending for this code, not illuminate but malfunction was detected
Warning lamp was previously illuminated for this code, malfunction not currently detected, code not yet erased
Stored trouble code
Manufacturer specific status
Manufacturer specific status
Current code - present at time of request
Maturing/intermittent code - insufficient data to consider as a malfunction

There are just a few references to this mode on the web, but nothing specific. Wonder if later cars use mode $19 (?)

-Tom