I also had a p2263 code that kept repeating,would not complete KOER,followed p/p tests with no results-replaced the ebp sensor and checked pipe,retested still there,reprogrammed pcm,finally got the KOER to complete p2263 gone but then got a p0401 code egr stuck.also forgot to say that I remember a SSM stating engineering was working on a fix for p2263 and not attempt repairs.cannot remember the number.