If you have an 03/04 common rail that you have done a manual transmission swap and downloaded smarty software, you now have a 2127 code. Also the pedal is dead for some travel in the beginning and has only about 75% total throttle percentage when hooking up a scanner with live data.
The reason for this is the software they provide is for a later model 04 325hp Manual trans truck. This truck came factory with the under battery throttle position sensor which works differently. It has 2 voltage output circuits, instead of the earlier model sensor that just have 1 voltage output and an idle validation switch.
When the manual trans software is downloaded it changes the inner workings of the ECM acceleration circuit. It is now looking for the 2nd voltage input provided by the under battey type sensor. This input into the main ECM plug #16 (APPS signal 2) is empty.
The proper way to fix the problem after the Manual Transmission software download is to install theUNDERBATTERY APPS SENSOR MOPAR PART# 53032456AE. You will need the throttle cable that goes with this sensor. You will also need the 03/04 DIRECT WIRE HARNESS that I make.The harness can be purchased on the 03-04 under battery APPS page.
There was a time in the past I offered a sensor that bolted to the existing APPS bracket on the side of the engine and you would run 1 extra wire down to #16 of the ECM plug. That sensor voltage curve only would achieve about 90% throttle. That created issues because most of the customers were building high horsepower trucks with stand alone transmission controllers or would have a fueling programmer that needed to see 100% throttle.
I have had customers use the alternative sensor after the swap that didn't notice any decreased power from the 10% lack of percentage, especially since the smarty fueling tunes greatly overcome that. If you have read this and want to go with the alternative sensor which makes the job a good bit cheaper and easier I could provide one upon request. Just send me an Email.
The main reason I offered that option is because years back the under battery sensors were on NATIONAL BACK ORDER for a very long time.