Technical Definition:

Secondary Air Injection System

Technical Description:

The P0410 code refers to the emissions system. The AIR pump puts air to the exhaust to lower emissions. It takes in outside air and pumps it through two one-way check valves into each bank of the exhaust.

Possible Causes:

• Water may have collected in the AIR pump or the vent solenoid and frozen or corroded the pump
• Blown AIR pump fuse due to freezing up

Possible Symptoms:

• MIL illumination obviously
• Hesitation on acceleration
• Noise from a bad/stuck AIR pump

Secondary Air Injection System Malfunction

Possible Solutions:

There is a technical service bulletin (TSB) regarding this code for a number of GM models. The TSB calls for the replacement of the AIR pump and the installation of a new secondary injection hose. The TSB can be found on this ACDelco site.

Additionally, if you simply replace the AIR pump the problem may return again (and again). If you replace the pump, also clean out the hoses and replace the one-way check valve. If this is on a GM model that the TSB applies to, follow those instructions in the link above. In a few cases, people have put a small hole in the rubber cover on the pump which allows any water to drain out.

Also, please note that this may be covered under the emissions warranty on the vehicle. If your vehicle is out of bumper-to-bumper warranty, check if the emissions warranty is still valid!

• Replace the AIR pump AND one-way check valve
• Test and clean the AIR pump AND test and replace the one-way air check valve
• Replace the AIR pump inlet hose
• Replace the AIR pump fuse (found under the hood)

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Vacuum hoses damaged
– Faulty Air Pump inoperative
– Air bypass solenoid harness is open or shorted
– Air bypass solenoid circuit poor electrical connection
– Air bypass solenoid leaking/blocked or stuck open/closed
– Air diverter valve leaking/blocked or stuck open/closed

Specific Makes:

– Engine hesitation