P0306 Chevrolet -

Question

What does the emblems behind the code mean? One code doesn't have it but the other is the same with what looks like pd after it. P0306, P0306 pd, P0507, P0507pd

Answer 1

Pd this means pending, P0306 is misfire number 6, P507 is idle control system RPM higher that expected. P0507 Pd means its pending., what you have is a misfire on the number 6 cylinder and a high RPM, what ever is causing the high RPM may also be contributing to the misfire condition.