63999146401ty

I have a 2003 ml350 and it needs a new TCM and a conductor plate. Truck was parked for 9 months after . Now I checked the car changed the serpentine belt and driving in city because it is on limp mode. Now I seen the oil pressure sensor came on, I went and changed the oil. The light still comes one when driving at 44 to 60 for 10 mins. Help what should I do? Does this light work with the circuit for the TCM? I have a Po715 and a Po600 code. I checked and changed my fuses and I Po600 is off now