SCR system issues

You have multiple active aftertreatment faults active, most all with aftertreatment sensor and communication codes. You are most certainly dealing with an electrical/wiring issue. Start with batteries and connections- From there check all fuses for being installed in the correct location or opens. Then the issue moves to chassis related wiring and loss of power or ground to the related sensors and components. Wiring schematics and skilled electrical ability will be needed to get to the bottom of your issues.

 

Could be the NH3 sensor, it is removed out from calibration but still can cause A-can communication faults.

 

Wow, that's a bunch of faults all logging simultaneously. Definitely check power and ground to the ACM. From there, I'd look for any major wiring faults. If none found, I'd throw a test ACM on it for a quick diagnosis.

Sound like it's attempting a self check at key on, and immediately fails it.

 

Don’t replace the NH3 module or sensor probe. The part is obsolete and programming updates have deleted the sensor from being used for DEF dosing. @spsauerland is indicating that the part may be internally shorted causing communication faults on the datalink for the after treatment. If your engine software is up to date , just unplug the component to see if your faults go away.

 

Unplug the harness from the NH3 sensor module/ box.

 

Yes, thank you @Goodysnap . Unplug it, clear your codes and refresh it to see if is causing your issues. You will use very little DEF when you have an SCR fault because engine will rely more on EGR mode to reduce NOX because of the DCR related faults. Sorry didn't explain better, I type slow so don't leave the most detailed responses at times.