§ 1037.745 End-of-year CO2 credit deficits.
Except as allowed by this section, we may void the certificate of any vehicle family certified to an FEL above the applicable standard for which you do not have sufficient credits by the deadline for submitting the final report.
(a) Your certificate for a vehicle family for which you do not have sufficient CO2 credits will not be void if you remedy the deficit with surplus credits within three model years (this applies equally for tractors, trailers, and vocational vehicles). For example, if you have a credit deficit of 500 Mg for a vehicle family at the end of model year 2015, you must generate (or otherwise obtain) a surplus of at least 500 Mg in that same averaging set by the end of model year 2018.