Abs code PO411 - 2008 Chevrolet Trailblazer

Try to check vacuum lines, hose might be damage, or pitch.
check air pump connector might be loose, poorly connected.

That code means that you have a, secondry air injection system ,incorrect flow detected

Your P2004 code relates to inlet manifold air control actuator or solenoid on bank 1 stuck open, your code PO411 relates to secondary air injection system, (AIR ) incorrect flow detected. Obviuosly both codes are linked to one fault,

The valve may need to be replaced. Only air flows thru the components.

code po411 secondary air injection system incorrect flow,possible causes , faulty air pump or faulty air pump vacuum valve or faulty check valve.

call your local autozone and they can tell you what you can try to fix the problem

there is no po441 code on this vehicle there is a p0442.

This is a code related to the air flow from the air pump (aka pollution pump) into your exhaust system. This air pump takes outside air and injects it in the exhaust stream after the engine to help burn off any residual fuel or pollutants. When P0411 comes up, the control module detects a lack of air flow either caused by a defective air pump, leaking/clogged air hoses, or bad check valves.

The P0410 code refers to the emissions system.
The AIR pump puts air to the exhaust to lower emissions. It takes in outside air and pumps it through two one-way check valves into each bank of the exhaust.
About 90% of the time that this code is set, the one-way check valves have worn out or failed and allow water (which occurs naturally in the exhaust) back into the pump. In any cold climate, especially in climates with higher humidity, this water may be more excessive. The water partially fills the AIR pump, it can then freeze. When the PCM commands the pump on, if the pump is frozen it cannot turn, thus overloading the circuit and "popping" the fuse.

In here you can find the Trouble Codes List:
The CODE mean P0411 Secondary Air Injection System Incorrect Flow Detected

Good luck!!!

i would go to autozone if it is for egr valve then it is actually the dpf sensor the other codes are straight forward they will check them for free