I 
119TH CONGRESS 
1ST SESSION H. R. 6250 
To require the Administrator of the Environmental Protection Agency to 
authorize manufacturers of certain vehicles to suspend engine derate 
or shutdown functions in prolonged cold weather conditions, and for 
other purposes. 
IN THE HOUSE OF REPRESENTATIVES 
NOVEMBER 21, 2025 
Mr. BEGICH introduced the following bill; which was referred to the 
Committee on Energy and Commerce 
A BILL 
To require the Administrator of the Environmental Protec-
tion Agency to authorize manufacturers of certain vehi-
cles to suspend engine derate or shutdown functions in 
prolonged cold weather conditions, and for other pur-
poses. 
Be it enacted by the Senate and House of Representa-
tives of the United States of America in Congress assembled, 
SECTION 1. SHORT TITLE. 
This Act may be cited as the ‘‘Cold Weather Diesel 
Reliability Act of 2025’’. 
SEC. 2. FINDINGS. 
Congress finds that— 
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(1) diesel vehicles are vital for critical transpor-
tation and emergency services in cold weather re-
gions; 
(2) in rural regions with prolonged freezing 
conditions, diesel exhaust fluid storage, supply, and 
system functionality are frequently unreliable and 
logistically impractical on a year-round basis; 
(3) automatic engine shutdowns and power re-
ductions due to emissions control malfunctions in ex-
treme cold pose serious, life-threatening risks; and 
(4) emissions safeguards under the Clean Air 
Act (42 U.S.C. 7401 et seq.) were never intended to 
jeopardize human safety or impede critical mobility. 
SEC. 3. DEFINITIONS. 
In this Act: 
(1) ADMINISTRATOR.—The term ‘‘Adminis-
trator’’ means the Administrator of the Environ-
mental Protection Agency. 
(2) 
COVERED
MANUFACTURER.—The 
term 
‘‘covered manufacturer’’ means the manufacturer 
(as defined in section 216 of the Clean Air Act (42 
U.S.C. 7550)) of a covered vehicle or an engine of 
a covered vehicle. 
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(3) COVERED VEHICLE.—The term ‘‘covered ve-
hicle’’ means an on-highway diesel vehicle or 
nonroad diesel equipment. 
SEC. 4. DIESEL ENGINE EMISSIONS RELIEF IN COLD 
WEATHER REGIONS. 
(a) COLD WEATHER SENSOR MITIGATION MEAS-
URES.—Not later than 180 days after the date of enact-
ment of this Act, the Administrator shall revise any appli-
cable regulation under the Clean Air Act (42 U.S.C. 7401 
et seq.) that applies to covered vehicles or engines used 
in covered vehicles to authorize covered manufacturers to 
suspend inducement-related engine derate or shutdown 
functions that are triggered by emissions control system 
faults when ambient temperatures are at or below zero de-
grees Centigrade and to specify that no party other than 
a covered manufacturer shall suspend those inducement- 
related derate or shutdown functions, subject to the condi-
tions that— 
(1) the engine returns to normal emission con-
trol operation, including inducement enforcement, 
once ambient temperatures rise above zero degrees 
Centigrade; and 
(2) continued maximum engine performance 
when ambient temperatures are at or below zero de-
grees Centigrade is necessary to prevent occupa-
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tional danger, equipment failure, or loss of essential 
transportation functionality in remote areas with 
limited roadside support or emergency communica-
tions access. 
(b) RELIEF TO REGIONS WITH PROLONGED FREEZ-
ING CONDITIONS.— 
(1) IN
GENERAL.—Not later than 180 days 
after the date of enactment of this Act, the Adminis-
trator shall revise any applicable regulation under 
the Clean Air Act (42 U.S.C. 7401 et seq.) to grant 
a year-round exemption from diesel exhaust fluid 
system requirements any covered vehicle that— 
(A) is primarily operated north of 59 de-
grees north latitude, as demonstrated by docu-
mentation of commercial operation, domicile lo-
cation, or maintenance and dispatch records; or 
(B) encounters operational or logistical 
conditions characterized by prolonged ambient 
temperatures that— 
(i) are below the freezing point of die-
sel exhaust fluid; or 
(ii) otherwise make the use of the die-
sel exhaust fluid system impractical. 
(2) SCOPE OF RELIEF.—In carrying out para-
graph (1), the Administrator shall grant to a cov-
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ered vehicle described in subparagraph (A) or (B) of 
that paragraph an exemption from any requirement 
to include an engine derate or shutdown function 
that is triggered by the absence, degradation, mal-
function, or fault of a diesel exhaust fluid system, 
including any associated sensors or electronic control 
modules. 
SEC. 5. RULE OF CONSTRUCTION. 
Nothing in this Act waives compliance with any emis-
sions standard under the Clean Air Act (42 U.S.C. 7401 
et seq.) outside of— 
(1) the temporary cold-weather operational 
mode authorized under section 4(a); and 
(2) the exemption from diesel exhaust fluid sys-
tem requirements under section 4(b). 
Æ 
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