Taking the plunge. My journey as an O/O.

I'm hoping he was stopped and preparing to roll when he responded. I frequently check this forum while in line for fuel.

 

Well. The DEF issue popped up again, but I have been monitoring the truck more closely.

In a nutshell, the truck never performs an automatic regen any longer.

Several possibilities here..

First, the sensor that should be detecting the need for an auto regen has failed.

Second, wiring between the sensor and the truck computer has failed.

Third, the truck DEF software is corrupt.

Fourth, the electronics that control the DEF system are failing or damaged.

Once I finish this trip, truck's going in the shop to have this issue addressed.

 

Odd. I am pretty sure that fuel is supposed to stop going to the cylinders that are being used by the jakes. If the fuel is not completely stopped, then you would be feeding fuel into the exhaust directly, and it would likely be mixing with hot exhaust from other cylinders, combustion, and freaking out the DPF sensors. If it only happens at max jake, and not lower jake settings, then a mechanic might be able to say what cylinder the fuel is bypassing.

That's some guesswork there. I'm no diesel mechanic.

 

Sorry. Not a mechanic, and I consider the DEF system to be part of the DPF system. If that makes what I say confusing, I apologize.