P0411 Chevrolet -

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Carguy1 · Answer 1 · 2018-07-30T20:00:30+0000

Hi there,

If replacing the pump hasn't solved the issue, it's likely a wiring issue. Here is some more info for you.

P0411 CHEVROLET - Secondary Air Injection System Insufficient Flow

Read more: https://www.autocodes.com/p0411_chevrolet.html