I can't find anything on diagnosing a P0418 and I have no clue where the smog pump is

Tiny
2BROKE4THIS
  • MEMBER
  • 2008 CHEVROLET TRAILBLAZER
  • 200,000 MILES
I'm new to this stuff, would anyone happen to have some answers for me?
Saturday, April 11th, 2026 AT 5:48 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,404 POSTS
Hello,

The P0418 code is an electrical fault in the air pump relay control circuit, so it can be the relay or the fuse and if they are okay the pump itself is bad. Here is the location of the pump and what fuses/relays to check or swap out. These pumps go out all the time BTW. Check out the images (below). Please let us know what happens. Ken
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Sunday, April 12th, 2026 AT 9:52 AM

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