Share
Ask OBDII Question

18,142 questions

9,387 answers

623 comments

4,419 users

Top Users

Reynaldo (3421 Points)
G37driver (2450 Points)
OBDIITech (2376 Points)
milonajo1 (737 Points)
OBDtech2 (165 Points)
corvette-78 (127 Points)
knowledge 1488 (124 Points)
Samat Bekov (117 Points)
ptl (113 Points)
sabtele (112 Points)

2010 Chevy Impala P02440 & p0411

Vehicle: 2010, Chevy, Impala LT, 3.5L
asked Jan 29, 2013 by anonymous

1 Answer

P0411 Incorrect secondary  airflow detected

P02440 Secondary air injection shut off valve stuck open

Here is the solution repair and satisfy  for code P2440,it means exacty whats wrong the secondary air pump is stuck open,On cold start up the catalytic needs be at a set temperature in order to work and control emission obviously when its cold it cant do its job,so a air pump is added to help warm it up. to control emission.The seconadry air pump turn on for about one minute,so during the day running errands the air pump is not always on,it not always needed. so this is where it fails. The ECM job is to check for shorts,opens,and rationality,Because the secondary air is open a solution is a secondary air pump

answered Feb 2, 2013 by Reynaldo (3,421 points)
...