Walter Posted December 10, 2016 Report Share Posted December 10, 2016 Check Engine light P0411 Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted December 10, 2016 Report Share Posted December 10, 2016 P0411 Secondary Air Injection (AIR) System Incorrect Flow Detected Either the AIR pump or the AIR solenoid (or relay) is not switching on or off on command of the PCM. look for wiring problems first, then check the AIR pump, the AIR solenoid and the AIR relay. (as Cadillac Jim posted here: Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
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