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I have a 2007 Cadillac Dts that Check Engine Light came on. The code is P0411.

What does that mean, and approximately how much to fix it? Dealership, or can I

do it myself?

Bruce

2023 Cadillac CT4-V Blackwing

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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.

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