Originally Posted by WoeIsMe
My Jeep is in again for repair. When I picked it up Saturday, it only had 98 miles until no restart. It was down to 30 miles until no restart when I took it back in. I wonder if these people really know what they are doing??? Why would they even give back with the infamous DEF message???
My DEF level shows almost 1/2 full at over 8K miles. I know it wasn't quite full when I bought it. Wonder if the DEF gauge is screwed up. OH well, maybe I'll get lucky this time. I will keep busy perusing the Lemon laws here in Texas.
No...they don't know what they are doing. That's the problem. Chrysler doesn't have a team dedicated to assisting on this issue and dealer techs are struggling to fix the issue. After a tech has had some experience with the DEF system, it may be easier for them to diagnose.
Here are the components and problems as I understand:
1. DEF tank - contamination, bad DEF, clogged outfeed
2. DEF pump - failed or low pressure
3. DEF line to injector - kinked or damaged, clogged
4. DEF injector - failed, clogged
5. Catalytic Converter - ?
6. NOx sensor - failed, improper reading
I believe there is no clear published diagnostic procedure for troubleshooting so the techs are guessing. Honestly, its not that complicated. Its a closed loop system. Some simple test can isolagte the issue to one of the above components.