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P0411 Diagnostic Trouble Code Discussion for February 2020

Secondary AIR System Incorrect Airflow Detected


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Trouble Ticket Help Requests for DTC P0411
Help Request Posted
2008 Buick Lucerne CXS 4.6L MIL Lamp on VIN: 1G4HE57Y18
P0411: secondary air injection incorrect flow detected. Buick with a northstar came in p0411 stored code found blown fuse for AIR pump, replaced the fuse and found AIR pump not working correctly. we replaced the AIR pump and the valve on rear valve cover. smoke tested all piping between pump and valve and no le...
February 24, 2020
2008 Buick Lucerne CXS 4.6L MIL Lamp on VIN: 1G4HE57Y18
P0411: secondary air injection incorrect flow detected. Buick with a northstar came in p0411 stored code found blown fuse for AIR pump, replaced the fuse and found AIR pump not working correctly. we replaced the AIR pump and the valve on rear valve cover. smoke tested all piping between pump and valve and no le...
February 25, 2020
2008 GMC Canyon SLE 2.9L Misfire VIN: 1GTDT19958
P0411: Secondary AIR injection incorrect air flow. ... complaint is a missfire. Pulled codes showed only a P0300 missfire history showed cyl 3, other cylinders had a few, we are talking less than 10 compared to cyl 3 with hundreds. Replaced the spark plugs and coil in cyl 3. Vehicle returns with same issu...
February 25, 2020