Trying to pass smog in cali :(

[mattt]

It's insane how many people have this same problem. Searching online web wide and at other GM vehicle forums, this problem is rampant! Example: http://www.gm-trucks.com/forums/topic/173303-secondary-air-injection-monitor-will-not-run/page-2

Quoting: "I just bought 2001 GMC Sierra with the same damn problem..extremely frustrating. I've completed several fresh drive cycles in the last few days to no avail..however, when I first brought the truck in to the smog center this morning the tech said it completed. Then when he "double checked" it before running the actual smog, it failed...this left me confused and a little pissed off..."

 

[mattt]

It's time for an update with my 2001 Silverado 4.8 problem. After 13 months, the Secondary Air System I/M Readiness test has FINALLY completed and run. Last month I broke down and had the A/C repaired as driving around with no A/C was getting old. A/C had leaked refrigerant at the charging port. ~$230 later and I have functioning A/C. I gave the truck a few weeks of driving with A/C on, and plugged in to check the Sec Air Sys I/M. As of last week, it was still showing Incomplete. Fast forward to yesterday....I plugged in again and the Sec Air Sys I/M Readiness test has FINALLY completed and gone to "OK."



Quick like today, first thing this morning....I went and had the smog check completed and ran to AAA so I finally have tags for the first time in over a year. I am making a leap here......but I DO think that the A/C being functional is one small part of the Secondary Air System running it's self test and flipping the I/M Readiness Status to OK.



I spoke to a friend that is a GM Tech and he told me there is a lot of strange code in the factory program that can make even a seasoned tech scratch their head when diagnosing problems. He wasn't certain that the A/C was linked to Sec Air Sys, but said there is a strong possibility that it was.

 

[SLCHOE]

I actually remember a car I was having trouble with getting the monitors ready (used cars at a Honda Dealership) so we could do the I/M. After hours of driving I found the drive cycle and I remember the first few instructions involving letting it idle for 5 minutes and then turning the A/C on. But it wasn't a GM. I believe it was an import.

Glad you got it to run!