94 c2500 6.5, 94 k3500 6.5, 97 K3500 6.5 01 3500 Cummins 07 2500hd duramax
The optical sensor. (The jumper wire with the noise reducer in it) 1 end plugs into the engine harness and the other end plugs into the optical sensor. Take that section out and plug the engine harness directly into the optical sensor. Both times I had this issue I had the same codes and the same problemsAre you talking the optical sensor or the cps?