P0243 diagnosis points to bad ECU.

[Bob4x4]

This may not apply to your truck but I received a letter from Chrysler that the ECM warranty on my 2004.5 has been extended to lifetime coverage. The letter states that it only applies to 2004/2005 2500/3500 5.9 engines that are equipped with California emissions. It relates to state mandated inspections and not complete failure but the letter was dated 2010 and maybe failure is now an issue as well. If you have a very early 2006, maybe it has a 2005 ECM. Just for your information in case you find a connection to this issue and your problem.

That has to do with monitors not showing correctly for the smog test in Cali and does not apply to 06 my

 

[MX5racer]

My truck is not a Cali truck and I have not seen anything from Dodge that would indicate that they are responsible for anything that is/was wrong with my truck.......EVER. Cerberusiam, what is the patch wire from cummins you are talking about?

 

[cerberusiam]

It is a replacement wire for the connector ends, can be bought separately to fix issues where the connector end is not contacting the ECU pins correctly.