Heavy-duty Vehicle and Engine Greenhouse Gas Emission Regulations

Marginal note:Spark-ignition engines

25 A company may elect to include heavy-duty engines of the 2023 model year or an earlier model year that are spark-ignition engines in a fleet of Class 2B and Class 3 heavy-duty vehicles and cab-complete vehicles — excluding those that are vocational vehicles or incomplete vocational vehicles — if the following conditions are met:

• (a) the fleet is composed of vehicles equipped with engines of the same model year, design and hardware;

• (b) the engines are

  • (i) installed in emergency vehicles, motor homes or heavy-duty incomplete vehicles that are not cab-complete vehicles, or

  • (ii) sold without being installed in a vehicle;

• (c) the number of engines referred to in paragraph (b) represent not more than 10% of the number of engines — whether they are installed in vehicles or not — that are of the same model year, design and hardware in the fleet;

• (d) instead of conforming to sections 29 and 30, the engines referred to in paragraph (b) conform to

  • (i) the N₂O and CH₄ emission standards and the calculations of the emission values referred to in section 20, and

  • (ii) the CO₂ emission target value and test result determined in accordance with section 1819(k)(8)(vii) of Title 40, chapter I, subchapter C, part 86, subpart S, of the CFR; and

• (e) the company reports its election in its end of model year report.