U.S. Congress legislation · 119th Congress
HB9618: DEF Act
Status: In committee, July 14, 2026
To amend the Clean Air Act to preserve regulatory stability for motor vehicles, motor vehicle engines, nonroad vehicles, and nonroad engines, and for other purposes.
What the bill says
To amend the Clean Air Act to preserve regulatory stability for motor vehicles, motor vehicle engines, nonroad vehicles, and nonroad engines, and for other purposes.
From the introduced text, July 9, 2026:
A BILL To amend the Clean Air Act to preserve regulatory stability for motor vehicles, motor vehicle engines, nonroad vehicles, and nonroad engines, and for other purposes. SECTION 1. Short title This Act may be cited as the Diesel Engine Flexibility Act or the DEF Act . SECTION 2. Preservation of on-road vehicle and engine regulatory stability Section 202 of the Clean Air Act ( 42 U.S.C. 7521 ) is amended by adding at the end the following: (n) Preservation of motor vehicle and engine regulatory stability (1) Guidance-based safe harbor During the period of 10 years beginning on the date of enactment of this subsection, implementation of an inducement strategy or diesel exhaust fluid quality monitoring described in the covered guidance documents with respect to new and in-use motor vehicles and engines, including heavy-duty engines, heavy-duty vehicles, light-duty vehicles, light-duty trucks, and light-duty engines, shall not constitute a prohibited act under this title if the implementation is undertaken in a manner consistent with the covered guidance documents, to the extent such covered guidance documents apply to such a motor vehicle or engine that is required to comply with the 2007 standards or the 2010 standards, provided that such implementation is consistent with otherwise applicable certification requirements and useful life requirements under this title. (2) Regulatory stability (A) Temporary regulatory …
Sponsors
- Fedorchak, Julie (R, HD-000) · primary sponsor
- Donald Davis (D, HD-001)
- Brad Finstad (R, HD-001)
- Jack Bergman (R, HD-001)
- Michelle Fischbach (R, HD-007)
- Mike Bost (R, HD-012)
- H. Morgan Griffith (R, HD-009)
- Michael Rulli (R, HD-006)
Latest actions
- : Forwarded by Subcommittee to Full Committee by Voice Vote.
- : Subcommittee Consideration and Mark-up Session Held
- : Referred to the House Committee on Energy and Commerce.
- : Referred to the Subcommittee on Environment.
- : Introduced in House
Subjects: Environmental Protection Agency (EPA), Administrative law and regulatory procedures, Motor carriers, Air quality, Environmental Protection, Motor vehicles, Environmental regulatory procedures
Common questions
- What is HB9618?
- HB9618 is a bill in Congress (119th Congress): DEF Act.
- What does HB9618 do?
- In its own words: To amend the Clean Air Act to preserve regulatory stability for motor vehicles, motor vehicle engines, nonroad vehicles, and nonroad engines, and for other purposes.
- What is the status of HB9618?
- In committee as of July 14, 2026. Latest action: Forwarded by Subcommittee to Full Committee by Voice Vote. (July 14, 2026).
- Who sponsored HB9618?
- Fedorchak, Julie (R, HD-000), with 7 co-sponsors.
- Where is the official record for HB9618?
- On the Congress website: https://www.congress.gov/bill/119th-congress/house-bill/9618
Source: official Congress record. Tracked by Delilah, AI for legislation across all 50 states and Congress.