2013 Duramax DEF Quality
Will code P003A trip DEF Quality warning? I know if the turbo is sticking it will cause the incorrect amount of airflow and in return will create excessive Nox but is it in the programing that the warning will automatically set? Repair info: Truck came in a week ago for DEF quality warning. I checked codes and found P003a and another for turbo sticking (sorry i lost the number because I updated from an edge to a zues and forgot to save all my repair history before trade in). I commanded the turbo actuator with scan tool truck was both hot and cold and turbo vanes moved freely. I test drove vehicle and watched reductant data and did not see any readings that I believed were out of line. So I cleared codes and preformed def quality test and it passed. Truck came back a week later with P2BAD DEF NOX exceedance cause unknown , P2610 ECMTCM off timer, P003A Turbo position. I test drove truck again and found that NOX sensor 2 was slow and did not go below 40 ppm on decel. Also ALER is 1.08 to 1. Also commanded turbo and found it was sticking a little at this time. I believe I have two separate issues one being turbo is sticking other being NOX sensor 2 lazy. When I check the freeze frame data I find that the turbo actual and desired pid are the same in both failures. This leads me to believe that DEF warning is from NOX sensor not turbo. I know the simple solution is repair turbo issue first but I am slammed at the shop at the moment so to preform that will take me a month to get to it. If replacing the NOX sensor will get it out of reduced speed until I have time to repair turbo I could at least keep it going until I have time in my schedule. I will also preform a quantity test for 9th injector and def injector but have not done so yet. Thanks in advance. 77k miles
Have you did the emmision reduction fluid quanity test on def injector with it out of exhaust into a graduate,,,40-50cc during test,shoulod spray 3 streams,,,,also if possoble look into scr catalayst for build up of hard def…
AIR LEAK EQUIVALNCY RATIO. Quick test to check for leaks in intake and exhaust. Command EGR closed and look at ALER PID in data stream. Should be 1:1 if not then you look for leaks.
The turbo faults should not cause the P2BAD. I would agree you can fix the NOx issue to get it down the road temporarily.
There is a def quality test you can run def will crystalize with age and may trigger def quality code running the test circulates the def fluid may have to run a few times to pass, don’t know what scanner you are running Snapon also tells me about clearing data in two different locations to clear the speed reduction issues
Trevor, Have you actually taken a sample of the DEF and checked it with a refractometer?
Yes, tested with refractometer. Tested same strength as new box on the shelf.
Attached is the a file from mdi when passed quailty test. Never shared a file like this so not sure if it can be opened.
It has been 2 months so I am calling the truck fixed. I watched Nox 2 and after a hard decel from a hard accel Nox2 should go to 0 ppm fairly quick, it did not get below 20 ppm for a while. I replaced Nox2 and retest drove and sensor was much quicker to go to 0. Sorry for the vague closure but it was 2 months ago and i forgot to document my readings. Hope this helps someone thanks.