2001 silverado 1500 5.3L secondary air monitor won’t complete

[01Silverado2wd]

hello gm-trucks commuinty i’m having issues with a smog readiness monitor not completing. any information on this issue would be greatly appreciated. my truck is a 2001 Chevy Silverado LS 1500 with a 5.3L v8 and it’s 4x2. all the readiness monitors complete except the secondary air system causing the truck to fail smog in california. i’ve heard the air pump turn on at cold starts and even replaced the passenger side check valve. also replaced the solenoid that sends vacuum. everything in the secondary air system seems to be operating properly but the monitor won’t complete. i’ve driven 100s of miles and done countless cold starts but no luck. even the smog referee said the system is working properly and i should just drive the truck more. anyone else experience this issue and what did you have to do to complete the monitor? there are no codes stored currently and the truck runs fine. thank you to anyone that helps

Edited March 26, 2023 by 01Silverado2wd
misspelled

[Marcos Barragan]

Hello at the moment I’m having the same issue all monitors ready except the “2A” monitor funny enough it use to be one of the first monitors to ready I’ve had to delete codes a couple times from my truck because I was also struggling with recurring knock sensors codes after fixing that my “ 2A “ moniter just fails to ready I’ve driven many miles and cold started it many more times and it just won’t ready I just can’t seem to see what would be wrong with it sense before while I was getting codes for my knock sensor it would ready up fine without an issue