When your truck is under Derated with codes 3712 and 3714, you have to do the following step by FCAR truck scanner if there is not physical part failure:
1) Go Diesel Engine, select Cummins, it will show couple DPF/DEF/Aftertream related codes. This is Hardcodes, it wouldn't be able to remove by scanner
2) Read the engine codes entirely. The first thing is to make sure that all the failed part needs to be repaired or replaced. The NOx sensor, temperture sensor or DPF/SCR/DEF are most importatant thing to look at
3) Under Cummins main menu, selection Action Test to find Forced Regen Option to start Forced Regen
4) If you are installing new Aftertreatment particular filter, you will need to select Aftertreatment Installation, you will be able to find the function under Cummins ->Special Function -> Advanced ECM data ->Aftertreament installtion
5) Or if you are not installing new particular filter, you might just do Aftertreatment reset
6) For some cases, you need to calibrate NOx sensor or reset.
7) Final step, go back to remove codes, it should be able to reset all derate codes and the vehicle should be able to get rid of derate.
***for some case, if the above steps are not able to clear the codes 3712 and 3714, it is most likely you need to reprogram aftertreatment ECM.
3712 - Aftertreatment SCR Operator Inducement- Data Valid but Above Normal Operational Range- Most Severe Level
Conditions for Clearing the Fault Code: This fault code will go inactive once all other active fault codes have been addressed. Refer to the appropriate fault code troubleshooting tree. The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.
3714 - Engine Protection Torque Derate- Condition Exists
Conditions for Clearing the Fault Code: This fault code will go inactive once all other active fault codes have been addressed. Refer to the appropriate fault code troubleshooting tree. The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
A regen and SCR test was performed post repair. All of the temps looked perfect and it passed all of the tests. The 3712 and 3714 still would not go away, there were absolutely no other codes. I have experienced this before, my simple minded explanation is that the codes are latched and there is a software issue. I decided to reflash the computer to the latest calibration. The codes were gone and everything was back to normal.
"You have to have whatever fault triggered FC3712 & FC3714 fixed and inactive. The ECM then has to see that everything in the emissions systems is functioning properly. So clearing the 3714 & 3712 will depend on what originally failed.
If you had an outlet NOx sensor failure, that NOx sensor will have to hit 550f for it to start reading. Run a regen to get your aftertreatment hot quickly. Once the ECM sees that NOx sensor reading properly, the NOx sensor fault and the derate faults should go inactive.
But what if you had something like an SCR efficiency fault? Cummins doesn’t dose DEF during a regen. You’re going to have to do more than just run a regen to clear the 3714 & 3712. Run your regen. Let it go a good, long time, so that you get the SCR heat saturated. Knock off the regen and start performing accelerator snaps. The transient operation will raise NOx levels and force the ECM to dose DEF. Once the ECM sees a meaningful reduction in NOx across the SCR, your derate faults should go inactive.
Pay attention to Conditions For Clearing The Fault Code in Fault Overview for your primary fault. Most likely that is what you’ll need to do to get the derate a to clear out.
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