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Dan, Technician
Category: Chevy
Satisfied Customers: 26226
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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P0411. 2014. Replaced secondary air valve, ran air pump with

Customer Question

JA: What is the model/year of your Chevy?
Customer: 2014
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: yes replaced secondary air valve, ran air pump with scan tool, verified no cloggs in hoses or ports in cylinder head
JA: Do the vents feel cold? Is there a coolant leak?
Customer: what vents??? no coolant leak
JA: Anything else you want the mechanic to know before I connect you?
Customer: had same code 6 mths ago, replaced valve ok untill now, valve is gm supplied
Submitted: 11 months ago.
Category: Chevy
Expert:  Dan replied 11 months ago.

Hello, my name is ***** ***** I'm here to help get your problem solved.

Expert:  Dan replied 11 months ago.

What model and engine size is vehicle?

Customer: replied 11 months ago.
2014 impala lt 2.5
Expert:  Dan replied 11 months ago.

I​ think the new valve has probably failed, I'm assuming you have activated pump already? does scan tool allow you to activate valve?

Customer: replied 11 months ago.
OK but this was 2nd valave, air pump runs with scan tool & when bypassing relay,i believe scan tool has that capability, code came right back after cold restart with new gm valve
Expert:  Dan replied 11 months ago.

I think troubleshooting chart is going to be your best option with this code. This code means the pressure sensor built into the valve did not detect enough pressure which would either mean weak pump, clogged port, or sensor not working properly and the troubleshooting chart will walk you through testing each component. Here is chart, let me know if you have more questions. Thanks.

Expert:  Dan replied 11 months ago.

Ever get it figured out? Please do not forget to rate answer. Thanks.