emissions ready monitors, 2017 L5P
So I failed my first emissions and I found that clearing a fault code resulted in resetting all of the readiness monitor flags. I've been performing the recommended GM "drive cycles" to get these all set before I take it back in for testing again. Wondering if any of the admins or techs on this page can answer some questions?
How long should it take to set all 9 of the flags? I've put on 350 miles (give/take) and thus far, 7 of the 9 are set.
Remaining is the EGR test and the filter PM test (the DPF test)- presumably, it wants to go through a regen on its own to set that flag. I forced a mobile regen but that readiness flag hasn't set, so I'm guessing that the PCM must first sense the high end of the soot level and do it's own thing in order to set the flag.
As to the EGR test, how long should that take? I'm not seeing it being set. Are more drive cycles required?
And has anyone gone through this where the emissions testing station appears to be testing readiness monitors for a gasser rather than the diesel? The diesel has some unique monitors (boost pressure, exhaust gas, DPF PM, etc.) which a gasser doesn't have. I've used 3 different scanners and they all show a different set of monitors for the diesel compared to the gas engines! Any thoughts?
L5P emissions readiness monitors
Still working on getting the remaining readiness monitors set, with 450 miles logged thus far. Soot level is around 50%. After discussing the matter with my dealership, Maverick's suggestion of letting the truck do its thing appears to be the correct course of action and, the EGR may be completed at that time. I'm told "pending codes" don't matter.
As to the difference between readiness monitors for gas vs. diesel, I'm getting the impression that the testing stations don't care (at least in Wisconsin)- perhaps they're only looking for a certain number of monitors ready (for me, it's 8 out of 9)- the actual failing monitor doesn't seem to matter being that scanners clearly show a difference.
All emissions readiness monitors are now "Green".
All set; all readiness monitors are "green". Thus far, I've accumulated 1,500 miles in this attempt; yours may be different. Most difficult to set was the PM Filter monitor as it appears that the PCM has to do a complete, uninterrupted regen on its own. You cannot force a regen manually and interrupting a regen (shutting down the truck after a regen started, and allowing the regen to resume another time) did not set the ready monitor. I had to wait for the soot level to trigger a regen and let it run on its own! Next worst was the EGR as it took miles- LOTS of miles at combined city/highway driving and take long trips if necessary. The cold startup in the morning may have something to do with how long it takes to set all monitors, but I didn't have the luxury of waiting until ambient air was within 11 deg F of the coolant temperature at each startup- which supposedly is what GM's drive cycle calls for.
It shouldn't have to be this much of a pain in the ass, but it clearly looks as if GM didn't do us any favors here. With luck, I'll pass emissions now!