4.2L (LL8) DTC Engine Diagnostic Parameters

[Mooseman]

Thanks to @TJBaker57 , this document lists most, if not all, engine/emissions related DTCs, what they mean and conditions required for the code to set. Can be useful in understanding the how and why codes set.

Although it says 2004, it should apply to all years.

 

[TJBaker57]

Found 2 more official looking documents with DTC specifics in addition to the first one I posted elsewhere. I see some additional codes in the engine one that were not in the first 2004 document. Another is specific to the LL8+4L60E combination.

Here are the 2 additions...

https://gsi.ext.gm.com/gmspo/mode6/pdf/2003/2003file2.pdf

https://gsi.ext.gm.com/gmspo/mode6/pdf/2004/2004trans2_4L60E.pdf

And for completeness sake, here is the first such document I stumbled on...

https://gsi.ext.gm.com/gmspo/mode6/pdf/2004/2004file2_LL8.pdf

 

[Mooseman]

I have merged your thread to this one to have a single point of reference. I have also unlocked it in case you stumble across some more.

 

[TJBaker57]

have also unlocked it in case you stumble across some more.

Good idea! Just grabbed another! Oddly, the link Title I found states "General MotorsPDF
2002 LL8 GMT360 Certification Document - General Motors"......but the file says 2005.

https://gsi.ext.gm.com/gmspo/mode6/pdf/2005/2005file2.pdf