On this 96 K2500 code f eng, code P1214D comes on, doesn't turn on mil though. The scan tool I'm using reads TDC at -2.5. I have tried to get it to relearn TDC offset, but the genysis scan tool I'm using will not do it. Is there a way for it to relearn without a scanner? Will it be a problem if I leave it the way it is? The truck runs and starts excellent.