2004 GMC ENVOY Service engine soon light code P0410.
I HAVE CHANGED THE VALVE SOLENOID CHECK THE FUSE FOR THE SOLENOID. CHANGED
THE AIR PUMP AND THE RELAY FOR THE AIR PUMP. BUT THE PUMP STILL DOESN'T TURN ON.

Question = WHAT ELSE IS THERE TO CHANGE TO MAKE THAT AIR PUMP TURN ON. I TOOK IT
TO SEVERAL MECHANICS AND THEY CANT FIGURE IT OUT. PLEASE LET ME KNOW WHAT
YOU THINK. (I HAVE CHANGED THE VALVE SOLENOID CHECK THE FUSE FOR THE solenoid.
CHANGED THE AIR PUMP AND THE RELAY FOR THE AIR PUMP. BUT THE PUMP STILL DOESN'T
TURN ON.

Answer:
There is also a
fuse for the pump. If that fuse is ok, then the next thing to check for is that there is
power at the pump relay, then ground the relay to turn on the pump. If you can manually turn on
the pump, then the problem may be with the pcm.

The pump relay grounds controlled by the pcm. When you say that the pump never comes on, i
assume you are using a scanner that can control the pump. The pcm will only turn on the pump
under certain conditions. A scanner that can control the pump can turn it on anytime. The p0410 is
set under curtain circumstances, and it monitors the #1
02 sensor to determine if the system is
functioning properly, and decide to set a code.
Check engine light - Also known as the SERVICE ENGINE SOON or SES light. This
indicates a malfunction in the engine control and emissions systems of your car. Step by
step instructions on how to do a simple scan to check for computer trouble codes. These
codes give an indication as to what system is having a problem.
Automotive questions -  Browse lists of some previously answered questions. Choose
your vehicle by Make and Model and read articles our expert mechanics have answered.
Auto repair part installation, location, how to, diagnosis, common causes and failures.
Same Issue here, Pump, fuse relay and hoses all changed 500 dollars later still on
changed bank 1 and bank 2 o2 sensor still nothing whats next...
Comments
Had the same code on my truck. Dealer ended up finding a bad diverter valve on
the passenger side of the engine. Sort of looks like an EGR valve. Replaced that
and no more check engine light.
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GMC Envoy P0410- Secondary Air Injection System