Some may be unavailable due to it not being an option thats required or tested in particular. Some scanners show a readiness monitor for the A/C system (aircon) to test for refrigerant leaks but it's not a requirement for emissions readiness. I know in CA you are allowed up to 1 incomplete readiness monitor without an automatic failure or insufficient data return. If any you had previously were incomplete and are now complete, then you should be good to go. As colchiro suggested, driving in hybrid mode is required to set those readiness monitors and may take a few drive cycles to complete all of them.
If you're using a bluetooth/wifi dongle, try the app OBD Auto Doctor (android for sure has it). In the diagnostic tab at the bottom it also includes readiness monitors. If all of them have a check or it shows 0 of ?? required, then you have all of the monitors set.
Unavailable is not a fail, it means the computer is not performing that test, and never will.
Incompletes are the ones you need to focus on.
And check with your local regulations as to how many incompletes you can have and pass.
And while you're at it, petition them to exempt a vehicle that uses 80%+ less fuel than others on the road
(Volts are exempt from emissions tests here, thankfully)
took me over 2 years to get all flags set: Then I had a battery replaced just before an inspection.
GM has a note ( I can not find now ) on fast track to setting all ready flags
Things like drive over 50 + for 20 min with out slowing down but most say to just drive a few days or a week on gas only.
A forum community dedicated to Chevy Volt electric car owners and enthusiasts. Come join the discussion about hybrid performance, modifications, classifieds, troubleshooting, maintenance, reviews, and more!