2009 Tahoe OBD Inspection Fail

[winmag45]

I failed inspection because of OBD not ready codes.I did have the battery changed but that was a year ago.I'm not getting any error codes or check engine lights.The 2 codes showing are the evaprative system,and Oxygen sensor.I did the drive cycle that I found on the Chevy site but still no luck.Any ideas????Thanks

 

[drakon543]

so you dont have a cel but you have 2 pending codes? not sure as you said you have codes but no cel so im assuming its showing pending codes. pending codes could mean a slight intermittent fluctuation going out of limit. a fault has to stay faulted or happen a certain number of times i believe before the ecm upgrades them to a full fault. pending codes technically could fail you for emissions as they are also possibly interrupting the regular diagnostic cycles.

 

[George B]

You mean you have two incomplete monitors. O2 and EVAP but no DTCs stored.

 

[winmag45]

Yes,sorry I didn't explain that properly.It was 2 incomplete monitors.No check engine light,no diagnostic error codes.Thank You

 

[gooffeyguy]

Have you cleared/reset codes or flashed a tune to the ecm lately?

Anytime you install a tune or clear codes it resets the readiness monitors

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[George B]

What year make and model?

Never mind, it's in the title.

 

[winmag45]

I had an oil change last month but I drove at least 100 since then.Maybe he did a reset.
I do use one of those devices that bypasses the fuel management system but I had pulled it out before inspection.I’ve been using it a few years with no issues.
It’s a 2009 Tahoe LT.

 

[kbuskill]

I had an oil change last month but I drove at least 100 since then.Maybe he did a reset.
I do use one of those devices that bypasses the fuel management system but I had pulled it out before inspection.I’ve been using it a few years with no issues.
It’s a 2009 Tahoe LT.

You probably need to drive it for 100 miles or so with the Range device unplugged so it can complete its readiness cycle.

 

[winmag45]

I think you may be right.I am down to 1 code after I drove back and forth to work.Just the evap.Thanks so much for all of your help.This forum is the best.Thanks to all.

 

[OR VietVet]

Please report back with anything further as you add more miles about this.