1

Final Regulation Order 

Requirements to Reduce Idling Emissions From New and In-Use Trucks, 

Beginning in 2008 

NOTE: The regulatory amendments to existing language are shown in underline to 

indicate additions to the text and strikeout to indicate deletions. Paragraphs 

within a section that are not being amended in this rulemaking are indicated by 

"[No Change.].” Subsection headings are shown in italics so they will be 

published in a distinctive font in Barclays California Code of Regulations. 

Amend the following sections of Title 13, California Code of Regulations, to read as set 

forth in the following pages: 

§ 1956.8 Exhaust Emission Standards and Test Procedures 

for 1985 and Subsequent Model Year Heavy-Duty 

Engines and Vehicles 

§ 2404 Emission Control Labels and Consumer Information 

– 1995 and Later Small Off-Road Engines 

§ 2424 Emission Control Labels – 1996 and Later Off-Road 

Compression-Ignition Engines 

§ 2425 Defects Warranty Requirements for 1996 and Later 

Off-Road Compression-Ignition Engines 

§ 2485 Airborne Toxic Control Measure to Limit 

Diesel-Fueled Commercial Motor Vehicle Idling 
2

Amend Title 13, California Code of Regulations, § 1956.8, to read: 

§ 1956.8. Exhaust Emissions Standards and Test Procedures - 1985 and 

Subsequent Model Heavy-Duty Engines and Vehicles. 

(a)(1) [No Change.] 

(a)(2)(A) The exhaust emissions from new 2004 and subsequent model heavyduty diesel engines, heavy-duty natural gas-fueled and liquefied-petroleum-gasfueled engines derived from diesel-cycle engines, and heavy-duty methanolfueled diesel engines, and the optional, reduced-emission standards for 2002 

and subsequent model engines produced beginning October 1, 2002, except in 

all cases engines used in medium-duty vehicles, shall not exceed: 

Exhaust Emission Standards for 2004 and Subsequent Model Heavy-Duty Engines, 

and Optional, Reduced Emission Standards for 2002 and Subsequent Model HeavyDuty Engines Produced Beginning October 1, 2002, Other than Urban Bus Engines 

(grams per brake horsepower-hour [g/bhp-hr]) 

Model Year Oxides of 

Nitrogen Plus 

Non-methane 

Hydrocarbons 

Optional Oxides 

of Nitrogen Plus 

Non-methane 

Hydrocarbons 

Oxides of 

Nitrogen 

Non-methane 

Hydrocarbons 

Carbon 

Monoxide 

Particulates 

2004-2006H, 2.4 A,C,E,J 2.5 B,C,E,J n/a n/a 15.5 0.10 C

October 1, 2002 – 2006 n/a 1.8 to 0.3 A,D,F n/a n/a 15.5 0.03 to 0.01 G

2007 and subsequent n/a n/a 0.2 I 0.14 15.5 0.01 K 

A

 This is the standard for the arithmetic sum of the oxides of nitrogen exhaust component certification value and 

the non-methane hydrocarbon exhaust component certification value, without individual restriction on the 

individual component values. 

B

 This is the standard for the arithmetic sum of the oxides of nitrogen exhaust component certification value and 

the non-methane hydrocarbon exhaust component certification value, with the non-methane hydrocarbon 

individual component value not to exceed 0.5 g/bhp-hr. 

C

 For 2004 through 2006 model years, emissions averaging may be used to meet this standard. Averaging must be 

based on the requirements of the averaging, banking and trading programs described in “California Exhaust 

Emission Standards and Test Procedures for 1985 and Subsequent Model Heavy-Duty Diesel Engines and 

Vehicles” incorporated by reference in section 1956.8 (b), below. 

D

 A manufacturer may elect to certify to an optional reduced-emission NOx+NMHC standard between the values, 

inclusive, by 0.3 grams per brake horsepower-hour increments. Engines certified to any of these optional 

reduced-emission NOx standards are not eligible for participation in any averaging, banking or trading programs 

described in “California Exhaust Emission Standards and Test Procedures for 1985 and Subsequent Model 

Heavy-Duty Diesel Engines and Vehicles” incorporated by reference in section 1956.8 (b), below. 

E

 May be used as the certification standard for the higher emitting fueling mode of an engine certified under the 

dual fueling mode certification process of section 1956.8 (a)(4), below. 
3

F

 May be used as the certification standard for the lower emitting fueling mode of an engine certified under the 

dual fueling mode certification process of section 1956.8 (a)(4), below. 

G

 A manufacturer may elect to certify to an optional reduced-emission PM standard between the specified values, 

inclusive, by 0.01 grams per brake horsepower-hour increments. Engines certified to any of these optional 

reduced-emission PM standards are not eligible for participation in any averaging, banking or trading programs 

described in “California Exhaust Emission Standards and Test Procedures for 1985 and Subsequent Model 

Heavy-Duty Diesel Engines and Vehicles” incorporated by reference in section 1956.8 (b), below. 

H

 Engine manufacturers subject to the Heavy-Duty Diesel Engine Settlement Agreements (Settlement 

Agreements)1 must produce engines in compliance with the requirements contained in their respective 

Settlement Agreement. Most engine manufacturers subject to the Settlement Agreements are required to 

manufacture engines meeting the exhaust emission standards for 2004 and subsequent model years engines

beginning October 1, 2002. 

I

 A manufacturer may elect to include any or all of its heavy-duty diesel engine families in any or all of the NOx 

emissions averaging, banking, or trading programs for heavy-duty diesel engines, within the restrictions 

described in "California Exhaust Emission Standards and Test Procedures for 1985 and Subsequent Model 

Heavy-Duty Diesel Engines and Vehicles" incorporated in section 1956.8 (b), below. If the manufacturer elects 

to include engine families in any of these programs, the NOx family emission limit (FEL) may not exceed the 

following FEL caps: 2.00 grams per brake horsepower-hour (0.75 grams per megajoule) for model years before 

2010; 0.50 grams per brake horsepower-hour (0.19 grams per megajoule) for model years 2010 and later. The 

FEL cap applies whether credits for the engine family are derived from averaging, banking, or trading programs. 

J

 For 2007 through 2009 model years, a manufacturer may use these emission standards in accordance with

section 1956.8 (a)(2)(B). A manufacturer may elect to include any or all of its heavy-duty diesel engine families 

in any or all of the NOx plus NMHC emissions averaging, banking, or trading programs for heavy-duty diesel 

engines, within the restrictions described in "California Exhaust Emission Standards and Test Procedures for 

1985 and Subsequent Model Heavy-Duty Diesel Engines and Vehicles" incorporated in section 1956.8 (b), 

below. If the manufacturer elects to include engine families in any of these programs, the NOx family emission 

limit (FEL) may not exceed the following FEL caps: 2.00 grams per brake horsepower-hour (0.75 grams per 

megajoule) for model years. The FEL cap applies whether credits for the engine family are derived from

averaging, banking, or trading programs. 

K

 A manufacturer may elect to include any or all of its heavy-duty diesel engine families in any or all of the 

particulate averaging, banking, or trading programs for heavy-duty diesel engines, within the restrictions 

described in “California Exhaust Emission Standards and Test Procedures for 1985 and Subsequent Model 

Heavy-Duty Diesel Engines and Vehicles” incorporated by reference in section 1956.8 (b), below. The 

particulate FEL for each engine family a manufacturer elects to include in any of these programs may not exceed 

an FEL cap of 0.02 grams per brake horsepower-hour (0.0075 grams per megajoule). The FEL cap applies 

whether credits for the engine family are derived from averaging, banking, or trading programs. 

(a)(2)(B) through (a)(5) [No Change.] 

 

1

 Seven of the largest heavy-duty diesel engine manufacturers will be implementing measures to reduce 

emissions beginning October 1, 2002, to meet the requirements of the Heavy-Duty Diesel Engine 

Settlement Agreements reached with the ARB. The Heavy-Duty Diesel Engine Settlements were 

agreements reached in response to lawsuits brought by the United States Environmental Protection 

Agency and violations alleged by the ARB pertaining to excess in-use emissions caused by the use of 

defeat devices and unacceptable algorithms. Navistar signed its Settlement Agreement on October 22, 

1998. Cummins, Detroit Diesel Corporation, Caterpillar, Volvo, Mack and Renault signed their Settlement 

Agreements on December 15, 1998. 
4

 (a)(6) Heavy-Duty Diesel Engine Idling Requirements.

(A) Engine Shutdown System. The requirements in this subsection apply 

to engine manufacturers and original equipment manufacturers, as applicable, 

that are responsible for the design and control of engine and/or vehicle idle 

controls. 

1. Requirements. Except as provided in subsections (a)(6)(B) and 

(a)(6)(C), all new 2008 and subsequent model-year heavy-duty diesel engines 

shall be equipped with an engine shutdown system that automatically shuts down 

the engine after 300 seconds of continuous idling operation once the vehicle is 

stopped, the transmission is set to “neutral” or “park”, and the parking brake is 

engaged. If the parking brake is not engaged, then the engine shutdown system 

shall shut down the engine after 900 seconds of continuous idling operation once 

the vehicle is stopped and the transmission is set to “neutral” or “park.” The 

engine shutdown system must be tamper-resistant and non-programmable. A 

warning signal, such as a light or sound indicator inside the vehicle cabin, may 

be used to alert the driver 30 seconds prior to engine shutdown. The engine 

shutdown system must be capable of allowing the driver to reset the engine 

shutdown system timer by momentarily changing the position of the accelerator, 

brake, or clutch pedal, or other mechanism within 30 seconds prior to engine 

shutdown. Once reset, the engine shutdown system shall restart the engine 

shutdown sequence described in this paragraph above, and shall continue to do 

so until the engine shuts down or the vehicle is driven. 

 2. Engine Shutdown System Override. The engine shutdown 

system may be overridden, to allow the engine to run continuously at idle, only 

under the following conditions: 

 a. If the engine is operating in power take-off (PTO) mode. 

The PTO system shall have a switch or a setting that can be switched “on” to 

override the engine shutdown system and will reset to the “off” position when the 

vehicle’s engine is turned off or when the PTO equipment is turned off. Subject 

to advance Executive Officer approval, other methods for detecting or activating 

PTO operation may be allowed; or,

 b. if the vehicle’s engine coolant temperature is below 60°F. 

The engine shutdown system shall automatically be activated once the coolant

temperature reaches 60°F or above. The engine coolant temperature shall be 

measured with the engine’s existing engine coolant temperature sensor used for 

engine protection, if so equipped. Other methods of measuring engine coolant

temperature may be allowed, subject to advance Executive Officer approval. 

 c. if an exhaust emission control device is regenerating, and 

keeping the engine running is necessary to prevent aftertreatment or engine 

damage, the engine shutdown system may be overridden for the duration 

necessary to complete the regeneration process up to a maximum of 30 minutes. 

Determination of what constitutes the need for regeneration will be based on data 

provided by the manufacturer at time of certification. Regeneration events that 

may require longer than 30 minutes of engine idling to complete shall require 

advance Executive Officer approval. At the end of the regeneration process, the 

engine shutdown system shall automatically be enabled to restart the engine 
5

shutdown sequence described in subparagraph (a)(6)(A)1. above. A vehicle that 

uses a regeneration strategy under engine idling operating conditions shall be 

equipped with a dashboard indicator light that, when illuminated, indicates that 

the exhaust emission control device is regenerating. Other methods of indicating 

that the exhaust emission control device is regenerating may be used with 

advance Executive Officer approval.

 d. if servicing or maintenance of the engine requires 

extended idling operation. The engine’s electronic control module may be set to 

temporarily deactivate the engine shutdown system for up to a maximum of 

60 minutes. The deactivation of the engine shutdown system shall only be 

performed with the use of a diagnostic scan tool. At the end of the set 

deactivation period, the engine’s electronic control module shall reset to restart 

the engine shutdown system sequence described in subparagraph (a)(6)(A)1.

above.

(B) Exempt Vehicles. Heavy-duty diesel engines to be used in buses as 

defined in California Vehicle Code sections 233, 612 and 642, school buses as 

defined in California Vehicle Code section 545, recreational vehicles as defined 

in Health and Safety Code 18010, medium duty vehicles as defined in section

1900(b)(13) of title 13, California Code of Regulations, military tactical vehicles

as defined in section 1905 of title 13, California Code of Regulations, and 

authorized emergency vehicles as defined in California Vehicle Code section 165

are exempted from these requirements.

(C) Optional NOx idling emission standard. In lieu of the engine shutdown 

system requirements specified in subsection (a)(6)(A) above, an engine 

manufacturer may elect to certify its new 2008 and subsequent model-year 

heavy-duty diesel engines to an optional NOx idling emission standard of 

30 grams per hour. Compliance with this optional standard will be determined 

based on testing conducted pursuant to the supplemental NOx idling test cycle 

and procedures specified in section 86.1360-2007.B.4 of the “California Exhaust 

Emission Standards and Test Procedures for 2004 and Subsequent Model 

Heavy-Duty Diesel Engines and Vehicles,” as incorporated by reference in 

subsection (b). The manufacturer may request an alternative test procedure if 

the technology used cannot be demonstrated using the procedures in section 

86.1360-2007.B.4, subject to advance approval of the Executive Officer. A 

manufacturer certifying to the optional NOx idling standard must not increase 

emissions of CO, PM, or NMHC, determined by comparing results from the 

supplemental NOx idling test cycle and procedures specified in section 86.1360-

2007.B.4 of the referenced “California Exhaust Emission Standards and Test 

Procedures for 2004 and Subsequent Model Heavy-Duty Diesel Engines and 

Vehicles” to emission results from the idle mode of the supplemental steady state 

test cycle or emission results from idle portions of the transient test cycle for 

heavy duty diesel engines, respectively specified in sections 86-1360-2007 and

86.1327-98 of the referenced “California Exhaust Emission Standards and Test 

Procedures for 2004 and Subsequent Model Heavy-Duty Diesel Engines and 

Vehicles.” With advance Executive Officer approval, a manufacturer may use 

other methods of ensuring that emissions of CO, PM, and NMHC are not 
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adversely affected in meeting the optional NOx requirement. Also, 

manufacturers shall state in their application for certification that meeting the 

optional NOx idling requirement will not adversely affect the associated 

emissions of CO, PM and NMHC.

An engine manufacturer certifying its engine to the optional NOx idling 

emission standard must also produce a vehicle label, as defined in subsection 

35.B.4 of the “California Exhaust Emission Standards and Test Procedures for 

2004 and Subsequent Model Heavy-Duty Diesel Engines and Vehicles,” as

incorporated by reference in subsection (b).

(D) Optional Alternatives to Main Engine Idling. All new 2008 and 

subsequent model year heavy duty diesel engines may also be equipped with 

idling emission reduction devices that comply with the compliance requirements 

specified in title 13, CCR, section 2485(c)(3). 

(b) The test procedures for determining compliance with standards applicable to 

1985 and subsequent model heavy-duty diesel engines and vehicles and the 

requirements for participating in the averaging, banking and trading programs, 

are set forth in the “California Exhaust Emission Standards and Test Procedures 

for 1985 Through 2003 Model Heavy-Duty Diesel Engines and Vehicles,“ 

adopted April 8, 1985, as last amended December 12, 2002, the “California 

Exhaust Emission Standards and Test Procedures for 2004 and Subsequent 

Model Heavy-Duty Diesel Engines and Vehicles,” adopted December 12, 2002, 

as last amended September 1, 2006, and the “California Interim Certification 

Procedures for 2004 and Subsequent Model Hybrid-Electric Vehicles, in the 

Urban Bus and Heavy-Duty Vehicle Classes,” adopted October 24, 2002, which 

are incorporated by reference herein. 

(c) through (h) [No Change.] 

NOTE: Authority cited: Sections 39600, 39601, 43013, 43018, 43100, 43101, 43102,

43104, 43105 and 43806, Health and Safety Code; and Section 28114, Vehicle Code. 

Reference: Sections 39002, 39003, 39500, 43000, 43013, 43017, 43018, 43100, 

43101, 43101.5, 43102, 43104, 43106, 43202, 43204, 43205.5, 43206, 43210, 43211, 

43212, 43213 and 43806, Health and Safety Code; and Section 28114, Vehicle Code. 
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Amend Title 13, California Code of Regulations, § 2404, to read: 

§ 2404. Emission Control Labels and Consumer Information – 1995 and Later 

Small Off-Road Engines. 

(a) Purpose. Purpose. The Air Resources Board recognizes that certain 

emissions-critical or emissions-related parts must be properly identified and maintained 

in order for engines to meet the applicable emission standards. In addition, the Board 

recognizes that information regarding engines’ emissions levels may influence 

consumer choice. These specifications require engine or equipment manufacturers to 

affix a label (or labels) on each production engine (or equipment, as applicable) to 

provide the engine or equipment owner and service mechanic with information 

necessary for the proper maintenance of these parts in customer use. These 

specifications further require engine or equipment manufacturers to make information 

regarding relative emissions levels available to potential ultimate purchasers. For 

engines used in auxiliary power systems which, in turn, are used to comply with the

diesel-fueled commercial vehicle idling requirements of title 13, CCR, section 

2485(c)(3)(A), additional labeling requirements for the engine or equipment 

manufacturers apply, as set forth in section 35.B.4 of the “California Exhaust Emission 

Standards and Test Procedures for 2004 and Subsequent Model Heavy-Duty Diesel 

Engines and Vehicles,” as incorporated by reference in title 13, CCR, section 1956.8(b).

 (b) through (l) [No Change.] 

NOTE: Authority cited: Sections 39600, 39601, 43013, 43017, 43018, 43101, 43102 

and 43104, Health and Safety Code. Reference: Sections 43013, 43017, 43018, 

43101, 43102, 43104, 43150-43154, 43205.5 and 43210-43212, Health and Safety 

Code.
8

Amend Title 13, California Code of Regulations, § 2424, to read: 

§ 2424. Emission Control Labels — 1996 and Later Off-Road CompressionIgnition Engines. 

(a) Purpose. Purpose. The Air Resources Board recognizes that certain emissionscritical or emissions-related parts must be properly identified and maintained in order for 

engines to meet the applicable emission standards. The purpose of these 

specifications is to require engine manufacturers to affix a label (or labels) on each 

production engine (or equipment) to provide the engine or equipment owner and service 

mechanic with information necessary for the proper maintenance of these parts in 

customer use. For engines used in auxiliary power systems which, in turn, are used to 

comply with the diesel-fueled commercial vehicle idling requirements of title 13, CCR, 

section 2485(c)(3)(A), additional labeling requirements for the engine or equipment 

manufacturers apply, as set forth in section 35.B.4 of the “California Exhaust Emission 

Standards and Test Procedures for 2004 and Subsequent Model Heavy-Duty Diesel 

Engines and Vehicles,” as incorporated by reference in title 13, CCR, section 1956.8(b). 

(b) through (k) [No Change.] 

NOTE: Authority cited: Sections 39600, 39601, 43013, 43018, 43101, 43102 and 

43104, Health and Safety Code. Reference: Sections 43013, 43017, 43018, 43101, 

43102, 43104 and 43105, Health and Safety Code.
9

Amend Title 13, California Code of Regulations, § 2425, to read: 

§ 2425. Defects Warranty Requirements for 1996 and Later Off-Road 

Compression-Ignition Engines. 

(a) through (d) [No Change.] 

(e) Each manufacturer shall furnish with each new engine written instructions for 

the maintenance and use of the engine by the owner. The instructions shall be 

consistent with this article and applicable regulations contained herein. In addition, for 

engines less than 19 kilowatts, each manufacturer shall furnish with each new engine a 

written statement as follows: “In order to operate in California, a diesel-fueled engine in 

an auxiliary power system used to comply with the Airborne Toxic Control Measure to 

Limit Diesel-Fueled Commercial Motor Vehicle Idling requirements of the California 

Code of Regulations, must have one of the following apply: (1) be equipped with a 

verified Level 3 in-use strategy for particulate matter control, (2) have its exhaust routed 

directly into the vehicle’s exhaust pipe, upstream of the diesel particulate matter 

aftertreatment device, or (3) use an alternate particulate matter control strategy with 

prior Executive Officer approval. (For more details, please see the California Code of 

Regulations, title 13, section 2485(c)(3)(A).)”

(f) through (g) [No Change.] 

NOTE: Authority cited: Sections 39600, 39601, 43013, 43018, 43101, 43102, 43104 

and 43105, Health and Safety Code. Reference: Sections 43013, 43017, 43018, 

43101, 43102 and 43205.5, Health and Safety Code.
10

Amend Title 13, California Code of Regulations, § 2485, to read: 

§ 2485. Airborne Toxic Control Measure to Limit Diesel-Fueled Commercial Motor 

Vehicle Idling. 

(a) Purpose. Purpose. The purpose of this airborne toxic control measure is to 

reduce public exposure to diesel particulate matter and other air contaminants by 

limiting the idling of diesel-fueled commercial motor vehicles. 

(b) Applicability. Applicability. This section applies to diesel-fueled commercial motor 

vehicles that operate in the State of California with gross vehicular weight ratings 

of greater than 10,000 pounds that are or must be licensed for operation on 

highways. This specifically includes: 

(1) California-based vehicles; and 

(2) Non-California-based vehicles. 

(c) Requirements. Requirements. 

(1) Idling Restriction.

On or after February 1, 2005, the driver of any vehicle subject to this section 

shall comply with the following requirements, except as noted in subsection 

(d) below: 

(1A) the driver shall not idle the vehicle’s primary diesel engine for greater 

than 5.0 minutes at any location., except as noted in subsection (d); and

(2B) the driver shall not operate a diesel-fueled auxiliary power system 

(APS) to power a heater, air conditioner, or any ancillary equipment on 

that vehicle during sleeping or resting in a sleeper berth for greater than 

5.0 minutes at any location when within 100 feet of a restricted area., 

except as noted in Subsection (d). 

(2) Use of Alternative Technologies. 

(A) On or after January 1, 2008, the driver shall not operate an internal 

combustion APS on any vehicle equipped with a 2007 and subsequent 

model year primary diesel engine unless the vehicle is: 

1. equipped with an APS meeting the emissions performance 

requirements found in subsection (c)(3)(A), below; and
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2. the vehicle is equipped with a label meeting the requirements 

pursuant to section 35.B.4 of the “California Exhaust Emission 

Standards and Test Procedures for 2004 and Subsequent Model 

Heavy-Duty Diesel Engines and Vehicles,” as incorporated by 

reference in title 13, CCR, section 1956.8(b).

(B) On or after January 1, 2008, the driver shall not operate a fuel-fired 

heater on any vehicle equipped with a 2007 and subsequent model 

year primary diesel engine unless the fuel-fired heater meets the 

emissions performance requirements found in subsection (c)(3)(B), 

below; 

(C) On or after January 1, 2008, the driver of a vehicle equipped with a 

2006 or older model year primary diesel engine may use and operate in 

California any certified internal combustion APS with or without the 

additional PM control specified in subsection (c)(3)(A)1. or any other 

certified alternative idling reduction technology. 

(3) Compliance Requirements. As an alternative to idling the primary engine, 

diesel engines/vehicles may, as an option, be equipped with alternative 

technologies, as listed and defined below in (A), (B), and (C) of this 

subsection. If so equipped, these technologies are subject to the following 

requirements: 

(A) Internal Combustion APS. 

1. In order to operate in California, an APS utilizing an internal 

combustion engine must comply with applicable California off-road 

and/or federal non-road emission standards and test procedures for 

its fuel type and power category. In addition, diesel-fueled APSs 

installed on vehicles equipped with primary engines certified to the 

2007 and subsequent model year heavy-duty diesel engine 

standards, pursuant to section 1956.8(a)(2)(A) of title 13, CCR, 

shall either, 

a. be equipped with a verified Level 3 in-use strategy for 

particulate matter control (see title 13, CCR, sections 2700 to 

2710), or 

b. have its exhaust routed directly into the vehicle’s exhaust pipe, 

upstream of the diesel particulate matter aftertreatment device. 

2. With advance Executive Officer approval, a certifying/verifying APS 

manufacturer may petition for an alternate compliance strategy 

other than described in (A)1.a. or b. in this subsection above. 

However, this provision is limited to manufacturers that can 
12

demonstrate, to the satisfaction of the Executive Officer, that their 

alternative strategy is equivalent (or “cleaner”), from an emissions 

standpoint, compared to the requirement described in (A)1.a. or b.

in this subsection above. As an example, strategies that can use 

the available electric power infrastructure, instead of solely 

operating a diesel-fueled APS for engine and/or cab heating and 

cooling, may be able to use such a strategy to demonstrate 

compliance with these requirements. 

(B) Fuel-Fired Heaters. Fuel-fired heaters must comply with the applicable

California emission standards and test procedures as specified in the 

Low Emission Vehicle program requirements found in title 13, CCR,

subsections 1961(a)(15) and (d), or in Part I.E.1.13 of the “California 

Exhaust Emission Standards and Test Procedures for 2001 and 

Subsequent Model Passenger Cars, Light-Duty Trucks and MediumDuty Vehicles,” as incorporated by reference in title 13, CCR, section 

1961(d). However, the specified requirement that limits fuel-fired 

heaters from being operated above 40°F does not apply. 

(C) Other Idle Reduction Technologies. Other technologies that will reduce 

idling emissions may also be used, including the use of batteries, fuel 

cells, power inverter/chargers for on-shore electrical power, on-shore

electric power infrastructure also known as truck stop electrification, and 

other technologies that produce minimal or no emissions. With the 

exception of battery and fuel cell powered APSs, power 

inverter/chargers, and electric power infrastructure, the use of other 

technologies are subject to advance Executive Officer approval and 

must be at least as effective in reducing idling emissions as the 

technologies described in subsections (c)(3)(A), above, or the NOx 

idling emission standard specified in title 13, CCR, section 

1956.8(a)(6)(C). The Executive Officer shall use good engineering 

judgment and test data to determine if an idle reduction technology 

provides idling emission controls equivalent to the standards specified 

in subsection (c)(3)(A) above, or in title 13, CCR, section 

1956.8(a)(6)(C).

(D) Labeling Requirements. 2007 and subsequent model year commercial 

diesel vehicles equipped with an internal combustion APS meeting the 

requirements specified in subsection (c)(3)(A) shall have a label affixed 

to the hood of the vehicle to allow operation of the APS in California. 

The labels shall meet the requirements specified in section 35.B.4 of 

the “California Exhaust Emission Standards and Test Procedures for 

2004 and Subsequent Model Heavy-Duty Diesel Engines and Vehicles,” 

as incorporated by reference in title 13, CCR, section 1956.8(b). 
13

(d) Exceptions. Exceptions.

(1) Except when a vehicle is located within 100 feet of a restricted area, 

subsection (c)(1)(A) does not apply, if the vehicle is equipped with 

 

(A) a primary diesel engine meeting the optional NOx idling emission 

standard pursuant to title 13, CCR, section 1956.8(a)(6)(C); and

(B) a label meeting the requirements pursuant to section 35.B.4 of the

“California Exhaust Emission Standards and Test Procedures for 2004 

and Subsequent Model Heavy-Duty Diesel Engines and Vehicles,” as

incorporated by reference in title 13, CCR, section 1956.8(b). 

(2) Subsection (c)(1) does not apply for the period or periods during which 

(1A) a bus is idling for 

(A1). up to 10.0 minutes prior to passenger boarding, or 

(B2). when passengers are onboard; 

(2B) prior to January 1, 2008, idling of the primary diesel engine is 

necessary to power a heater, air conditioner, or any ancillary 

equipment during sleeping or resting in a sleeper berth. This 

provision does not apply when operating within 100 feet of a 

restricted area; 

(3C) idling when the vehicle must remain motionless due to traffic 

conditions, an official traffic control device, or an official traffic 

control signal over which the driver has no control, or at the 

direction of a peace officer, or operating a diesel-fueled APS or 

other device at the direction of a peace officer; 

(4D) idling when the vehicle is queuing that at all times is beyond 100 

feet from any restricted area; 

(5E) idling of the primary diesel engine, or operating a diesel-fueled 

APS, or operating other devices when forced to remain motionless 

due to immediate adverse weather conditions affecting the safe 

operation of the vehicle or due to mechanical difficulties over which 

the driver has no control; 

(6F) idling to verify that the vehicle is in safe operating condition as 

required by law and that all equipment is in good working order, 

either as part of a daily vehicle inspection or as otherwise needed, 

provided that such engine idling is mandatory for such verification; 
14

(7G) idling of the primary diesel engine, or operating a diesel-fueled 

APS, or operating other devices is mandatory for testing, servicing, 

repairing, or diagnostic purposes, including regeneration or 

maintenance of the exhaust emission control device during engine 

idling when the dashboard indicator light, if so equipped, is 

illuminated indicating that regeneration or maintenance is in 

progress; 

(8H) idling when positioning or providing a power source for equipment 

or operations, other than transporting passengers or propulsion, 

which involve a power take off or equivalent mechanism and is 

powered by the primary engine for: 

(A1). controlling cargo temperature, operating a lift, crane, pump, 

drill, hoist, mixer (such as a ready mix concrete truck), or 

other auxiliary equipment; 

(B2). providing mechanical extension to perform work functions for 

which the vehicle was designed and where substitute

alternate means to idling are not reasonably available; or 

(C3). collection of solid waste or recyclable material by an entity 

authorized by contract, license, or permit by a school or local 

government; 

(9I) idling of the primary diesel engine, or operating a diesel-fueled 

APS, or operating other devices when operating defrosters, 

heaters, air conditioners, or other equipment solely to prevent a 

safety or health emergency; 

(10J) idling of the primary diesel engine, or operating a diesel-fueled 

APS, or operating other devices by authorized emergency vehicles 

while in the course of providing services for which the vehicle is 

designed; 

(11K) idling of military tactical vehicles during periods of training, testing, 

and deployment; and 

(12L) idling when operating equipment such as a wheelchair or people 

assist lift as prescribed by the Americans with Disabilities Act;.

(e) Relationship to Other Law. Relationship to Other Law.

Nothing in this section allows idling in violation of other applicable law, including, 

but not limited to: 

(1) California Vehicle Code Section 22515; 
15

(2) Title 13, Section 2480, California Code of Regulations;

(3) California Health and Safety Code Section 40720; or 

(4) any applicable ordinance, rule, or requirement as stringent as, or more 

stringent than, this section. 

(f) Enforcement. Enforcement. This section may be enforced by the Air Resources 

Board; peace officers as defined in California Penal Code, title 3, chapter 4.5, 

Sections 830 et seq. and their respective law enforcement agencies’ authorized 

representatives; and air pollution control or air quality management districts. 

(g) Penalties. Penalties. For violations of subsection (c)(1), (c)(2) or (c)(23), the 

driver of a subject vehicle is subject to a minimum civil penalty of 100 dollars and 

to criminal penalties as specified in the Health and Safety Code and the Vehicle 

Code. 

(h) Definitions. Definitions.

The following definitions apply to this section: 

(1) “Authorized emergency vehicle” is as defined in Vehicle Code Section 

165. 

(2) “Auxiliary power system” or “APS” means any device that is permanently 

dedicated to the vehicle on which it is installed and provides electrical, 

mechanical, or thermal energy to the primary diesel engine, truck cab,

and/or sleeper berth, bus’s passenger compartment or any other 

commercial vehicle’s cab, as an alternative to idling the primary diesel 

engine. 

(3) “Bus” means any vehicle defined in Title 13, California Code of 

Regulations, Section 2480, subsections (h) (13)-(16), inclusive or as 

defined in the Vehicle Code Section 233. 

(4) “Commercial Motor Vehicle” means any vehicle or combination of vehicles 

defined in Vehicle Code Section 15210(b) and any other motor truck or 

bus with a gross vehicle weight rating of 10,001 pounds or more, except 

the following: 

 (A) a zero emission vehicle; or 

(B) a pickup truck as defined in Vehicle Code Section 471. 

(5) “Driver” is as defined in Vehicle Code Section 305. 

(6) “Fuel-fired heater” means a fuel burning device that creates heat for the 

purpose of (1) warming the cab or sleeper berth compartment of a vehicle 
16

or (2) warming the engine oil and/or coolant for easy start-up of the 

vehicle’s engine but does not contribute to the propulsion of the vehicle. 

(67) "Gross vehicle weight rating" is as defined in Vehicle Code Section 350. 

(78) “Highway” is as defined in Vehicle Code Section 360. 

(89) “Idling" means the vehicle engine is running at any location while the 

vehicle is stationary. 

(910) "Motor truck" or "motortruck" means a motor vehicle designed, used, or 

maintained primarily for the transportation of property. 

(1011) "Official traffic control device" is as defined in Vehicle Code Section 440. 

(1112) “Official traffic control signal" is as defined in Vehicle Code Section 445. 

(1213) “Owner” is as defined in Vehicle Code Section 460. 

(1314) “Primary diesel engine” means the diesel-fueled engine used for vehicle 

propulsion. 

(1415) “Queuing” means (A) through (C) 

 (A) the intermittent starting and stopping of a vehicle; 

 (B) while the driver, in the normal course of doing business, is waiting 

to perform work or a service; and 

 (C) when shutting the vehicle engine off would impede the progress of 

the queue and is not practicable. 

 (D) Queuing does not include the time a driver may wait motionless in 

line in anticipation of the start of a workday or opening of a location 

where work or a service will be performed. 

(1516) “Restricted area” means any real property zoned for individual or 

multifamily housing units that has one or more of such units on it. 

(1617) "Safety or health emergency" means: 

 (A) a sudden, urgent, or usually unforeseen, occurrence; or 

 (B) a foreseeable occurrence relative to a medical or physiological 

condition. 

(1718) “Sleeper berth” is as defined in Title 13, California Code of Regulations, 

Section 1265. 

(1819) “Vehicle” is as defined in the Vehicle Code Section 670. 
17

Authority: Sections 39600, 39601, 39614(b)(6)(A), 39658, 39667, 43000.5(d), 

43013(b), 43013(h), 43018(b) and 43018(c), Health and Safety Code; and 

Western Oil & Gas Assn. v. Orange County Air Pollution Control Dist. (1975) 14 

Cal.3d.411. 

Reference: Sections 39002, 39003, 39027, 39500, 39600, 39650, 39655, 39656, 

39657, 39658, 39659, 39662, 39665, 39674, 39675, 39667, 42400, 42400.1, 

42400.2, 42400.3, 42402, 42402.1, 42402.2, 42402.3, 42403.5, 42410, 

43000.5(d), 43013 and 43018, Health and Safety Code; Sections 305, 336, 350, 

440, 445, 545, 546, 642, 680, 21400, 22452, 22515, 27153, 40001 and 

40001(b)(5), Vehicle Code; and Sections 1201,1900, 1962 and 2480, Title13, 

California Code of Regulations.