2010 Chevrolet Impala 3.5L Engine P02440 to P0411: What Could Be Missing After Check Valve Replacement?

Model: 2010 Chevy Impala Fault Code: P0411 Posted: 2016-02-28 16:55

I recently had a P02440 diagnostic code on my 2010 Chevrolet Impala with a 3.5L engine. I replaced the exhaust gas recirculation (EGR) check valve as recommended, but now the vehicle is showing a new code: P0411. All connections are tight and properly secured. I'm wondering if there's something I may have missed during the repair process or if this could be related to another component. Any insights on possible causes of the transition from P02440 to P0411 in a 3.5L Chevrolet Impala?