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Here is a Technicl Service Bulletin from GM concerning this code.
Bulletin No.: 04-06-04-015
Date: March 22, 2004
Subject:Check Engine Light On, DTC P0410 Set (Replace AIR Pump, Install New Hose Assembly)
Models:1999-2003 Chevrolet Blazer, S101999-2001 GMC Jimmy1999-2003 GMC Sonoma1999-2001 Oldsmobile Bravadawith 2.2L or 4.3L Engine (VINs 4, H, 5, W - RPOs LN2, L43, L35)
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:
1. Prep vehicle.
Tighten the bolts to 17 N.m (12.5 lb ft)