Section 586.8 - Incomplete registrations(a) If NHTSA determines that a submission is incomplete, NHTSA will notify the registrant, by email, within 90 days, that there is missing information. The registrant shall have 60 days to submit the missing information. This notification will be sent to the email address provided in the manufacturer's original submission.(b) If NHTSA receives the missing information within 60 days of notifying the registrant that its submission is incomplete, NHTSA will approve or deny the registration within a period of time equivalent to the number of days that were remaining in the original 90-day period at the time NHTSA sent the notification, plus an additional 30 days.(c) If a registrant does not respond to NHTSA's notification that its submission is incomplete within 60 days, or the registrant responds within 60 days but the additional information submitted is not sufficient to complete the registration, the registration may be denied.