2017 Suburban - failed MASS inspection - Question

[Prospect62]

As others have said, the emissions readiness monitors just need to set. In order for that to happen, the truck needs to be driven though a set amount of drive cycles and at various fuel levels, including startups, shut downs, constant speed cruising, and varied throttle starts and stops. Many (if not most) times, it will take much more than "an hour of driving".

Not sure about Mass, but here in NY you are allowed to have one readiness monitor "not ready" and still pass your inspection, as long as the other ones all are.

 

[danyou]

Thank for the info. I went to the dealer and they told me they updated the ECM and to drive it for a week. I have a scan tool and all the following were coming up RED.
So I drove it for a few days - a few hundred miles and then all the codes but the EVA were on.


Then Today I drove for an Hour - and all the previous codes came back on. WTF? Anyone? I was using a RANGE previously but it has been unplugged since I took it to the dealer originally a week ago today. Let me know if anyone has any thoughts? Thank you

 

[Fless]

I don't have any idea of what's causing the issue, but to be clear, those icons aren't indicating DTCs -- codes -- they're showing only the status of the readiness monitors. The monitors need to run before a DTC can be set.

 

[danyou]

@Fless - thanks - I totally get that. I thought things were going in the right direction until I checked them today after about a 2 hour drive, one hour each way.