Frequently Asked Questions about
Proposed Technical Corrections to the
Light-duty Vehicle Greenhouse Gas
Regulations
Brief answers to common questions about proposed technical corrections to EPA's
light-duty vehicle greenhouse gas regulations credit provisions.
What are the proposed changes covered in this regulation?
a;	EPA is proposing corrections to fix two technical errors related to compliance credit
calculations in the light-duty vehicle greenhouse gas (GHG) emissions standards
regulations finalized in the 2012 rulemaking establishing standards for model years
2017-2025 light-duty vehicles.
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How is this technical amendments proposed rule related to the recently proposed "Safer
Affordable Fuel-Efficient (SAFE) Vehicles Rule for Model Years 2021-2026 Passenger Cars
and Light Trucks"
EPA and the National Highway Traffic Safety Administration (NHTSA) recently proposed the
SAFE vehicles rule regarding GHG and Corporate Average Fuel Economy (CAFE) standards for
Model Years (MY) 2021 to 2026 (see 83 FR 42986, August 24, 2018). The technical corrections
proposed in the technical amendments rulemaking correct items related to the current credits
program finalized in the 2012 rule for model year 2017-2025 vehicles (see 77 FR 62624, October
15, 2018) and are separate from the SAFE vehicles proposal.
Do these changes impact the stringency of light duty GHG emission standards?
No. The proposed corrections would not change the level of stringency of the standards. The
proposed corrections will simply make the regulations consistent with the intent of the 2012
final rule and allow the program to function as designed. The proposed corrections are not
expected to result in any significant changes in regulatory burdens, costs, or benefits of the
program.
When would these changes take effect?
The proposed corrections would take effect when the final rule becomes effective. The optional
advanced technology incentives are available for model years 2017-2021. The off-cycle credits
program began in model year 2012 and is ongoing. Once the technical amendments rule is final,
the changes would correct the application of advanced technology vehicle multipliers for MYs
2017 through 2021, and the off-cycle credit calculation methodology for MY 2012 and later
vehicles.
How would these proposed changes be implemented?
For the 2017 model year reporting, EPA manufacturers entered all their test data as they nor-
mally, with fleet credits calculated from the values as determined by EPA's current regulatory cal-
culation. After the proposed regulations are finalized, EPA will allow manufacturers to request,
through EPA's online system used by manufacturers to submit data to EPA for vehicle emissions
certification and compliance purposes, that the EPA system recalculate the manufacturer's fleet
performance based on the corrected values. EPA does not expect this to be burdensome, as the
necessary data for the recalculation will have previously been submitted electronically by the
manufacturer. The off-cycle correction would be implemented through EPA's established process
for the off-cycle program.
Public Participation Opportunities
We welcome your comments on this proposed rule. Comments will be accepted for 30 days
beginning when this proposal is published in the Federal Register. Please submit comments at
www.regulations.gov to Docket EPA-HQ-OAR-2017-0755. Information on additional methods
for submitting formal comments is available at www.epa.gov/dockets/where-send-comments-epa-
dockets.
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Where can I find more information?
Additional information for this proposed rule is available on EPA's Office of Transportation and
Air Quality website at:
www.epa.gov/regulations-emissions-vehicles-and-engines/proposed-rule-technical-
amendments-light'duty-vehicle
For further information on this proposed rule, please contact Christopher Lieske at:
U.S. Environmental Protection Agency
Office of Transportation and Air Quality
2000 Traverwood Drive
Ann Arbor, MI 48105
734-214-4584
E-mail: lieske.christopher@epa.gov
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