aftertreatment 1 secondary air differential pressure : voltage above normal

I'll reply later with fix. Driving atm.

 

Disregard, duraflame says it's an electrical issue. ... good luck op

 

No. This an electrical issue. It's a Lee engine if it has regen

 

Alright, so the code leads to an electrical issue with the DPF differential sensor. Usually it is a bad sensor on these but it is always good to check to make sure it isn't a wiring issue. Good thing is, you buy the pressure sensor and it comes free with both temp sensors also! It's sold as a unit and mounted to the DPF. The bolts will most likely be frozen in the sensor group. The tech working on it will check for pin fretting, then check continuity to the module from the ECM. If good he will replace the sensor group and confirm the repair w/ a regen. So the issue with running w/ this problem is eventually the DPF will become plugged because the regen system is disabled w/ this code active since it cannot properly read pressure in the DPF. The reason it is not a bad DPF or a broken substrate, its a -3 code for electrical. Easy as that, if it was a -2 for intermittent reading then yes we could be looking at a plugged or broken sensor tube, plugged or breached DPF or a bad sensor. Good luck.

 

maybe there something telling you going 80mph is insane, there are not any times made for a big rig that are rated for 80mph,,slow down keep your left door closed more,,

 

-4 isn't an intermittent read code... 373-4 isAftertreatment #1 Secondary Air Differential Pressure : Voltage Below Normal.

Regardless, op take your truck to the shop they will fix it... If the element isn't damaged, letting it plug could. And you could end up needing a tow as duraflame stated the truck won't regen.

As I said I had the same code 4 months ago in my 09 prostar with c13 lee (450,000 miles at the time). Luckily I said screw the load and got to a shop before the engine derated. Good luck

 

Yeah, I meant -2 code not -4