# Secondary Air Injection Code on 2001 Chevy Blazer **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, engines, blazer\ **Created:** [May 11, 2021, 6:17am UTC](https://community.cartalk.com/t/secondary-air-injection-code-on-2001-chevy-blazer/176725 "2021-05-11T06:17:11Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![valkyrie](https://avatars.discourse-cdn.com/v4/letter/v/5e9695/32.png) [@valkyrie](https://community.cartalk.com/u/valkyrie)\ **Post date:** [May 11, 2021, 6:17am UTC](https://community.cartalk.com/t/secondary-air-injection-code-on-2001-chevy-blazer/176725/1 "2021-05-11T06:17:11Z")
I have a CEL giving the code p0410. So I checked the fuse for the air pump which was blown so I replaced it and that got the light to turn off but only for a few days. I’m going to check on the fuse again in the morning but for now, I wanted to ask this - How exactly do I check to see if the air pump turns on during a cold start? Does a blown fuse automatically indicate the pump is the issue? I also want to mention that the truck hasn’t been near water. ---
**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\ **Post date:** [May 11, 2021, 11:56am UTC](https://community.cartalk.com/t/secondary-air-injection-code-on-2001-chevy-blazer/176725/2 "2021-05-11T11:56:24Z")
In 20 years, an intermittent short could have developed in the wiring to the pump. ---
**Author:** ![COROLLAGUY1](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/corollaguy1/32/7575_2.png) [@COROLLAGUY1](https://community.cartalk.com/u/COROLLAGUY1)\ **Post date:** [May 11, 2021, 12:42pm UTC](https://community.cartalk.com/t/secondary-air-injection-code-on-2001-chevy-blazer/176725/3 "2021-05-11T12:42:30Z")
Air pump? Didn’t know that modern vehicules were still using them but of course this its 20 year old pickup. ---
**Author:** ![jmcarc](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@jmcarc](https://community.cartalk.com/u/jmcarc)\ **Post date:** [May 11, 2021, 3:07pm UTC](https://community.cartalk.com/t/secondary-air-injection-code-on-2001-chevy-blazer/176725/4 "2021-05-11T15:07:02Z")
If an electric pump or motor gets stuck, it could draw more electric current which could cause the fuse to blow. ---
**Author:** ![valkyrie](https://avatars.discourse-cdn.com/v4/letter/v/5e9695/32.png) [@valkyrie](https://community.cartalk.com/u/valkyrie)\ **Post date:** [May 11, 2021, 6:56pm UTC](https://community.cartalk.com/t/secondary-air-injection-code-on-2001-chevy-blazer/176725/5 "2021-05-11T18:56:25Z")
I checked on the fuse again and it’s still closed, not blown. ---
**Author:** ![valkyrie](https://avatars.discourse-cdn.com/v4/letter/v/5e9695/32.png) [@valkyrie](https://community.cartalk.com/u/valkyrie)\ **Post date:** [May 11, 2021, 6:58pm UTC](https://community.cartalk.com/t/secondary-air-injection-code-on-2001-chevy-blazer/176725/6 "2021-05-11T18:58:07Z")
It’s a second gen s10 blazer not the s10 pickup. But thanks for the insight. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [May 11, 2021, 7:23pm UTC](https://community.cartalk.com/t/secondary-air-injection-code-on-2001-chevy-blazer/176725/7 "2021-05-11T19:23:45Z")
That fault indicates that the air injection pump is not operating. The PCM monitors the oxygen sensor for a reaction when the air pump is switched on, with no reaction it is determined that the pump is not operating. The blown fuse is a good indicator that the pump motor has seized/shorted.