i have a 04 avalanche 1500 z71 and it will not pass emissions cause of thedrive cycle resetting after i turn off the key. but when i drive i hook up a scanner and it goes through the tests fine. after that if i stop and turn the key off then back on the monitors reset every time. does nebody know whats up?

 

isn't it supposed to do that? That's why you have to do a driving cycle before checking emissions.

Is that not right?

 

no its not supposed to lose memory the drive cycle sets after all the monitors have cleared. mines resetting after every start

 

Yep, it shouldn't completely reset every time you cycle the key, or nobody would ever pass. Who did the tuning? Sounds like a PCM issue to me...I wonder if something was left "unchecked" or "checked" when the PCM was tuned?

 

there was an updated program, might be a bulletin

 

no tune bone stock truck

 

what do u mean updated program

 

the car in my sig is a gto

 

keep alive memory power is being lost. check all of your fuses.

 

what fuse is it i checked most of them