P0410 Cadillac -Dealer replaced pump light came on blames exhaust manifold leak

Question

The GM dealer replaced the Secondary air injector valve and pump everything is working as it should. Check engine light came back on. Cadillac says there is a leak in one of the exhaust manifolds. Does this sound right?

Answer 1

P0410 Secondary air injection system malfunction

You would not even be able to set a P0410, The Cadillac uses a pressure sensor for the secondary air injection system. You would have a pressure sensor code, P0410 the secondary has to be tested, not by use of a scan tool with bi-directional means. but by monitoring at a cold start.