What is the code 1416pd for a 2001 Chevy Silverado?

Question

Got two codes, 1416 and 1416pd

Answer 1

P1416 Secondary air injection Bank 2

This code is for the secondary air injection. The PD means the code is pending at not at full maturity, This code when set is most due to the one way air injection valve, what happens is rust accumulates and plug the one way valve,It is advisable to replace both the side of the one way valve.