G/TBT/N/USA/2036/Add.2  
 
11 December 2023  
(23-8403) Page: 1/2 
Committee on Technical Barriers to Trade  Original: English  
 
NOTIFICATION  
Addendum  
The following communication , dated  11 December 2023, is being circulated at the request of the 
delegation of the United States of America . 
 
_______________  
 
 
Title:  Proposed Amendments to the Heavy -Duty Engine and Vehicle Omnibus Regulation  
 
Reason for Addendum:  
[ ] Comment period changed - date:   
[ ] Notified measure adopted - date:  
[ ] Notified measure published - date:  
[ ] Notified measure enters into force - date:  
[ ] Text of final measure available from1:  
[ ] Notified measure withdrawn or revoked - date:  
Relevant symbol if measure re -notified:   
[X] Content or scope of notified measure changed  and text available from1:  
https://ww2.arb.ca.gov/rulemaking/2023/hdomnibus2023  
https://members.wto.org/crnattachments/2023/TBT/USA/modification/23_14250_00_e
.pdf 
New deadline for comments (if applicable):  21 December 2023  
[ ] Interpretive guidance issued and text available from1:  
[ ] Other:  
 
Description:  By notice posted on the California Air Resources Board's (CARB or Board) webpage on 
1 August 2023, and published in the 4 August 2023, California Regulatory Notice Register (Register 
2023, Number 31 -Z), CARB announced a public comment period for the Proposed Amendments to 
the Heavy -Duty Engine and Vehicle Omnibus Regulation. CARB subsequently received several 
requests for a public hearing, and CARB's Executive Officer (EO) conducted a hearing on 20 October 
2023, to consider approving the proposed amendments, under the authority delegated to the EO 
pursuant to Resolution 23 -15. 
CARB staff has determined that additional modifications to the initially proposed amendments are 
appropriate and has developed the proposed modifications (15 -Day Changes) as stated below in the 
"Summary of Proposed Modifications" section of this notice. The Appendices showing the s pecific 
proposed modifications to the text of the proposed regulation being made with these 15 -Day 
 
1 This information can be provided by including a website address, a pdf attachment, or other 
information on where the text of the final /modified  measure and/or interpretive guidance can be obtained.  G/TBT/N/USA/2036/Add.2  
 
- 2 - 
 
  Changes are shown in multiple ways in order to meet the requirements of the Administrative 
Procedure Act (APA) while also posting alternate/complementary ver sions that provide increased 
accessibility to view the modifications in multiple ways.  
The proposed modified regulatory language is available for public comment for a period of at least 
15 days as required by Government Code section 11346.8. To be consider ed by the EO, written 
comments must be submitted by 21 December 2023.  
Hearing Action and Supplemental 15 Day Notices  
Posted 6 December 2023  
Notice of Public Availability of Modified Text (Deadline to Comment: 21 December 2023)  
Appendix A -1: Proposed 15 -Day Changes to Proposed Regulation Order (15-Day Changes 
Available for Comment)  
Appendix A -2 ~Alternate Format to Appendix A -1~ 
Appendix A -3 ~Alternate Version~  
Appendix B -1: Proposed 15 -Day Changes to Proposed Modifications to the Diesel En gine Test 
Procedures (15-Day Changes Available for Comment)  
Appendix B -2 ~Alternate Format to Appendix B -1~ 
Appendix B -3 ~Alternate Version~  
Appendix C -1: Proposed 15 -Day Changes to the Otto -Cycle Engine Test Procedures  (15-Day 
Changes Available for Comment)  
Appendix C -2 ~Alternate Format to Appendix C -1~ 
WTO Mem bers and their stakeholders are asked to submit comments to the USA TBT Enquiry Point . 
Comments received by the USA TBT Enquiry Point from WTO Members and their stakeholders by 
4pm Eastern Time  on 21 December 2023 will be sh ared with CARB if received within the comment 
period.  
__________