Question about 2004 GMC Envoy
Check engine light comes on. Diagnostic check says secondary air supply failure. Upon removal of air hoses connected to electric air supply pump there is water in hoses and pump. Pump blows good amount of air when engine is first started. After a few seconds the pump slows to a low speed. After emptying water I disconnect negative battery lead to reset code and all is fine for about 50 miles. Then check engine light comes back on. Is it the pump or is it the secondary air valve mounted on engine block? Is it something else? I also had water in the secondary air injection pump. Had it changed for $ 300.00. Drove it around for about to days and the check engine light came back on. Now they are saying the valve is bad. Does anyone no what needs to be done
Well problem is with ur valve and u need to get it replaced by some mechanic, it will definitely going to fix ur problem mate.
Posted on May 09, 2009
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Posted on Jan 02, 2017
SOURCE: secondary air injection system
This is a pump that sits underneath your front bumper on the passenger
side. It is about the size of a baseball and has two hoses going into
it. I would suggest you replace it yourself as it would cost you about
$360.00 if you were to go through the dealer.
Water intrusion is what will typically kill these electric pumps. There is a Technical service bulletin (#04-06-04-015) Regarding this problem, according to the tsb, you will need a new pump and there is a hose assy. #12590627) that has you reroute the pump from future water intrusion or it is guaranteed to fail again.
Although I have had water in the pump I did not see any indication of the inlet hose as the cause. It was suggested that the one way metal check valves ($15.00) that mount to the rt & lt exhaust manifold are worn and allow water from the exhaust to get sucked back into the pump. I first replaced the pump and within a week of dry weather driving the light came back on. I checked the pump and it was again full of water. I just replaced the valves which had deteriorated on the inside. So hopefully this will eliminate the problem. Note - The valves are impossible to remove without removing the 1/2 tubes (held on with 2 nuts) they are attached to the manifold with. The valve threads seize to the tube thread and had to be clamped in a vise to remove - I actually had to hacksaw the valve section to get it off the pipe. Careful as not to damage the threads.
Good luck and try autopartsdirect2you for a new pump and it has life time warranty.
TSB #04-06-04-015 - (Mar 22, 2004)
Some owners may comment on the check engine light being illuminated. Upon investigation, the technician may find a DTC P0410 indicating that there is a concern in the secondary air injection system.
Water may have collected in the AIR pump or the vent solenoid and frozen or corroded the pump.
Replace the AIR pump and install a new inlet hose and solenoid tube assembly using the following procedure:
Raise vehicle on hoist.
Remove shield covering AIR pump.
Remove hose and vacuum lines from pump and solenoid.
Remove AIR pump inlet hose. Do not re-use.
Disconnect electrical connectors from pump and solenoid.
Remove pump mounting bolts and pump.
Transfer isolators from the old pump to the new pump.
Install new AIR pump and bolts to vehicle.
Tighten the bolts to 17N·m (12.5 lb ft)
Route new hose assembly up between engine and fender. It should come up near the area between the battery and the coolant bottle.
Connect new inlet hose to pump inlet.
Connect old outlet hose to pump outlet.
Connect electrical connector to pump.
Connect electrical connector for solenoid to connector on the new hose assembly.
Connect the hose with the white nipple to the vacuum source hose.
Connect the remaining hose to the shut off valve.
Install shield covering AIR pump.
Remove coolant reservoir nut nearest the battery.
Route new hose assembly between the battery and the coolant reservoir with the solenoid on top.
Install the solenoid bracket onto the coolant reservoir stud and reinstall the nut back into the vehicle.
Use a wire tie to keep the new hose assembly away from the engine. On four cylinder engines, tie to the AIR outlet hose. On six cylinder engines, tie to an available hole in the radiator fan shroud.
12590627 Hose Assembly - Secondary Air Injection
12568324 Pump, Secondary Air Injection for 2001 L35 + 2000-2003 L43/LN2
12560095 Pump, Secondary Air Injection for 1999-2000 L35
Hope that helps
Posted on Mar 06, 2010
SOURCE: Secondary air supply failure
Have the same problem on a 2004 envoy. Was told by my very reliable mechanic that the cause for this is the pump being exposed to the element too much, and it shorts out eventually, a very common problem with this car. Apparently the pump is on the chassis driver side and can easily be removed and replaced, and when removed, a person can hook a 12 volt battery directly to the pump to test if it's working or not before unnecessarily replacing a good part. This part is for emissions only and it's failure does not affect engine performance or milage.
Posted on Jan 03, 2009
This is a pump that pushes air into the exhaust manifold of your car. Typically when this code occurs the one way valve which prevents water from going back into pump has failed. You can usually just replace the valve to fix this problem.
Posted on Mar 15, 2011
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