- Jan 17, 2014
- 15
So I recently got the check engine light on my 2005 trailblazer lt 4.2 4wd with 122k miles, so I took it to autozone to get scan and it came up with the code p0410 with is infamous with this type of trucks. The guy at autozone put some seafoam threw the vacuum line and the light when away the truck even drove better, it took off faster well 2 weeks later and the light is back on same code "p0410", how do I go about troubleshooting this in other words where do I start. I took the big hose coming out from the bottoms of the air filter on a cold start but coudint feel no sucking, next I try removing the hose in the back of the check valve right next to the transmission dip stick but for some reason it didn't want to come off plus I really didn't have a lot of space to work with any help what should I check next before I start ordering parts, I really hope is the check valve not the air pump what the best way of testing the check valve any help