basically this means your Jeep's computer has detected some sort of problem with a part or system on the vehicle, and is letting you know via the Malfunction Indicator Light (check engine light). Unfortunately, the light itself does not detail the problem so here is a simple way to find ...
Sure enough, the yellow check engine light is there and I'm quite sure I'll see the P0401 code when I plug in the computer. I found a fairly good explanation as to how this thing works on the Lost Jeep forum. Hopefully, I can figure out how to disable it without the yellow light...
My son has a 2006 Jeep Liberty CRD with 2.8 Diesel. It has the Green Diesel Engineering software. Last week it threw an Engine code on the CEL; We went a parts store and they showed my son how to clear it. Three days later, the engine starts but dies right away. My plan: ...