I have a 2004 Envoy That is giving me a PO410 Code (Secondary Air Injection System). I have reset the code, but it keeps coming on. What would be causing this problem, and do I need to replace something on the vehicle, or could it just be a bad sensor? What effect does ignoring the code have on the engines performance.
hello and welcome to just answer.There is an extremely lengthy diagnostic chart that I can provide for you, however unless you are familiar with todays electronics and poses a TECH-2 scan tool it would not be much help for you. There is also a bulletin that I will provide, it states that an oxygen sensor could cause this problem. I would speculate that if the air pump operates correctly replace the o2 sensor and retest the system.If you feel my answer was helpful, please click the ACCEPT button. Feedback & Bonuses are always welcome.Best regards,Billy.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Currently, the SI diagnostics do not mention the position 1 O2 sensor as a potential cause of a P0410 DTC.
If the SI diagnostics do not isolate the cause of a P0410 DTC, there is no sign of dirt or water in the AIR pump or relay, and proper AIR check valve operation is noted, replace the position 1 O2 sensor.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
Over 25 years experience,GM grand master for 8 years,certified smog and government safety inspector
Where would I find the Air pump, check valve and relay so I can check them (is this a fairly easy thing to check or complex)? I had a dirty Air filter, could it have clogged the pump, or is on a different system? Also, is it possible to get an aftermarket O2 sensor on this vehicle or do I have to go to GM??
You can get an aftermarket sensor if you like to although the oem one is better quality.The air filter is not related to the problem with the air pump, they are on a different air intake system.The pump is located on the frame rail under the vehicle.The injection solenoid is above the exhaust manifold under the air intake assembly.if you need more information let me know. I will send you the description of operation as well.
Secondary Air Injection (AIR) System Description
The Secondary Air Injection (AIR) System reduces exhaust emissions following initial engine start up. This occurs when the engine Start-up coolant temperature is between 3-50°C (37-122°F) and the intake air temperature (IAT) is more than 1°C (32°F). The AIR pump will operate until Closed Loop operation is achieved.
The powertrain control module (PCM) activates the AIR system by suppling a ground to the AIR pump relay and AIR solenoid relay simultaneously. This action closes the internal contacts of the AIR pump relay, energizing the AIR pump and also closes the internal contacts of the AIR solenoid relay, energizing the AIR solenoid, opening the shut-off valve. The AIR pump forces pressurized fresh air into the pipes/hoses and past the check valve into the exhaust manifold, accelerating catalyst operation. When the AIR system is inactive, the AIR shut-off valve prevents airflow in either direction.
The AIR system includes the following components:
The PCM can detect an AIR System airflow fault by monitoring the heated oxygen sensor (HO2S) bank 1 sensor 1 during normal engine operation. This is an active test. The PCM will command the AIR system ON during Closed Loop operation to perform this test. The active test will pass or fail based on the response from the HO2S 1. The active test consists of three tests run at 3-second intervals. A decreasing HO2S voltage parameter response indicates that the secondary AIR system is functioning properly. If the PCM does not detect a decreasing response from the HO2S 1, DTC P0410 will set.