Service DEF, Regen Required... Just Kidding??

Yeah, unfortunetly without the software you are only seeing the "generic" name for the code givin. Software will provide more things to look at and inspect/test. oh, and one thing I forgot to mention is even a broken exhaust before the ATS will cause those issues too. Thanks, DJ

 

Take the sensor part of the nox sensor out and blow it out with air . See if that helps....may just be plugged up with soot....check all wiring as well in the process

 

The symptoms you are describing, where it asks for a regen and threatens to derate, gives a bogus Nox code and then all of a sudden goes away, is a wiring harness problem. Cut and dry.

If you bring up the soot level gauge on the dash, where it says "A 2 3 4", the level will be between the 2 and 3, which is about 130% plugged when you look at the value with Premium Tech Tool. Then, as you're driving down the road it will all of a sudden turn off the regen light and the soot level will drop to 50% or less. This is because the wiring harness makes the connection again.

I'd suspect that along with that Nox code, there are also CAN bus "data erratic" codes.

Every inch of the wiring harness needs to be inspected where it rubs up against any metal or is attached with a zip tie to a metal bracket. Then if no obvious chafing damage is found, unplug absolutely every single wiring connector you can get your hands on (after disconnecting the batteries), inspect for corrosion, apply a bit of silicone spray to them and reconnect. Pay particular attention to all the connectors and wiring around the DPF. Those wires live in hell.

Also with Nox codes, you mentioned you just got that truck? That particular code might be from old DEF. Let it run down pretty low and then refill it with fresh DEF.

 

Most of the time, unplugging and replugging stuff in will take care of it for a while. Does mine anyway. At least until the next visit to salt country and then rain.

 

If you repair it correct only 1 time though he isn't going to have more problems in the future. Who wants to keep unplugging it and plugging it back in?