2005 envoy Code po 410. Replace relay and air pump

Here's a link on your P0418 code Terry. P0418 OBD II Trouble Code Secondary Air Injection System Relay circuit...

take it to a dealer warranty should cover the repair ( emission sys )

Take it to a qualified repair shop an have it diagnosed properly !

c heck the two one way valves into each bank of the exhaust. These valves are working after the air pump taking the atmospheric air pumping it in to exhaust stream to low emissions by using the one way valves, Most probably are the valves not working and allow water -as usually exhaust produce- back into,

Duplicat question.

code po410 on a 2004 gmc envoy is that there is a problem with the secondary air injection system, you will need to check the fuse located in the engine compartment first, the next step is to start the truck cold and listen for the air pump to turn on for a few seconds, this will sound like a jet engine but not that loud, after it runs for 5 min and you dont hear it then you may have a bad pump which is located under the driverside on frame but if you hear the pump then you may have a bad valve, this valve is located on the exhaust manifold area and has a hose from the pump to valve, remove the hose and check for water, drain any water in the hose, also remove hose at pump and drain, the most common cause for this code is the valve is not opening and the air pump gets water inside and goes bad, thats the po410 code. a quick note; if fuse is blown look under truck near pump and check relay as it fills with water and blows fuse, if this is the case replace relay and blow water out of connector.good day.

Sound like a common issue with those vehicles. My research said it is a check valve, air pump, or the relay for it. Go to Trailvoy.com and type in po410 and there is great info. there for someone who has fixed this themselves and saved a lot. take care and good luck.

if it is a orange light thats a pic of a motor its the check eng light prob a Po 410 code

There is a relay under the car under the driver seat. The air pump is right next to it. You should hear the air pump come on when you start the vehicle. If not the relay is bad. You can jump the relay to see if the pump is bad or the relay is bad.