DTC P1415 on 2000 Chevrolet Silverado 1500

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I got DTC P1415 which is secondary air injection system malfunction, left bank, What can the problem be??
(1) Answer
The code p1415 for the secondary air injection system on your 2000 Chevrolet Siverado in most likely caused by a restricted check valve. There are two check valves, one for each bank. They are located between the pipe attached to each exhaust manifold and the rubber hose going to the air pump. You can test the air pump as follows: When the engine is cold, remove the rubber hoses from both check valves. Start the engine and make sure there is good air flow out of each of the rubber hoses. (You may need to block one at a time and you must be quick because the air pump runs for only a short time.) If the air flow is good, replace both check valves, if one is restricted the other one is not far behind.