Heavy-Duty OBD Regulations and Rulemaking

This page last reviewed September 25, 2013.




Clean Versions of the Latest OAL-Approved HD OBD Regulations

Here you will find the latest OAL-approved "clean" versions (with no strike-outs or underlines) of the HD OBD and associated enforcement regulations, sections 1971.1 and 1971.5, title 13, California Code of Regulations.  Since these clean versions were made by ARB staff for convenience, these versions do not constitute official versions of the regulations. The official versions of the regulations are Barclays Official California Code of Regulations and can be found at www.oal.ca.gov







Documents in the Final Rulemaking Package for HD OBD and OBD II: updated August 1, 2013

Here you will find the documents that are part of the final rulemaking package for the HD OBD and OBD II regulations (Board Hearing date August 23, 2012) that was approved by the Office of Administrative Law (OAL) on July 31, 2013 and became effective on the same day.

  • "Endorsed Approved" Form 400 and Final Regulation Order including "Endorsed Filed" by the Office of the Secretary of State (PDF - 1.29MB) (added August 1, 2013)
  • Addendum to the Final Statement of Reasons (PDF - 13K) (added August 1, 2013)
  • Final Statement of Reasons: Summary of the adopted regulations and each objection and recommendation made by the public during the 45-Day and 15-Day comment periods. (PDF - 256K)
  • Final Regulation Orders: These documents includes the strikeout/underline format to identify the changes from the current regulations.  The final regulation orders for sections 1968.2, 1968.5, and 1971.5 only include excerpts of the regulations where the changes were made.  Note that these regulation orders have not been officially approved by OAL at this time.
  • Updated Informative Digest: Summary of the regulations and the rulemaking process. (PDF - 42K)
  • Executive Order: Used when the Board approves the regulations with the 15-Day changes. (PDF - 63K)
  • Request for Early Effective Date: (PDF - 86K)
  • Notice of Decision: (PDF - 61K)

Documents for the OBD 15-Day Notice: posted here January 7, 2013

Here you will find the documents that detail the modifications and changes made to the staff's original proposed amendments to the OBD II and heavy-duty OBD regulations (Board Hearing date: August 23, 2012). Deadline for public comment on the changes: Friday, January 25, 2013.

  • Notice of Public Availability of Modified Text: The 15-Day Notice summarizing the changes to the regulations. The notice includes a summary of the Board's action, a list of the additional changes made to the original proposed amendments to the regulations, availability information of the attachments, and relevant dates. (PDF - 66K)
  • Attachment A: Modified Text of Sections 1971.1, 1968.2, 1971.5, and 1968.5: This document includes the double strikeout/underline format to identify additional changes to the original proposed amendments to the regulations made available to the public prior to the Board Hearing. (PDF - 201K)
  • Attachment B: Additional Supporting Documents and Information: This document includes additional information about specific amendments and the costs associated with the rulemaking. (PDF - 34K)
  • Attachment C: S&P 500 Index: Annual Returns (PDF - 39K)

OBD Regulation Documents for the Board Hearing: August 23, 2012

ARB held a Board Hearing on August 23, 2012 to consider adoption of staff's proposed amendments to the OBD II and heavy-duty OBD regulations and associated OBD enforcement regulations (sections 1968.2, 1968.5, 1971.1, and 1971.5 of title 13, California Code of Regulations). Here you will find the regulatory documents pertaining to the Board Hearing:

  • Board Presentation: ARB Board Hearing presentation of the proposed amendments to the regulations.  (PDF - 514K)  
  • Staff's Suggested Modifications:  Staff's suggested modifications to the original proposal distributed at the hearing.  (PDF - 386K) 
  • Public Hearing Notice: Invitation to public and industry to discuss the proposed changes to the regulations. This notice includes the date, time, location, and a summary of the issues to be covered during the hearing. (PDF - 47K)
  • Staff Report: Initial Statement of Reasons (ISOR): Descriptions of the proposed requirements. (PDF - 278K)
  • Proposed Heavy-Duty OBD Regulation section 1971.1: The regulation (section 1971.1 of title 13, California Code of Regulations) incorporating the proposed amendments.  This document includes the strikeout/underline format to identify changes from the current regulation. (PDF - 367K)
  • Proposed OBD II Regulation section 1968.2: The regulation (section 1968.2 of title 13, California Code of Regulations) incorporating the proposed amendments.  This document contains only the portions of the regulation that are affected by the amendments and includes the strikeout/underline format to identify changes from the current regulation. (PDF - 60K)
  • Proposed Heavy-Duty OBD Regulation section 1971.5: The enforcement regulation (section 1971.5 of title 13, California Code of Regulations) incorporating the proposed amendments.  This document contains only the portions of the regulation that are affected by the amendments and includes the strikeout/underline format to identify changes from the current regulation.   (PDF - 24K)
  • Proposed OBD II Enforcement Regulation section 1968.5: The enforcement regulation (section 1968.5 of title 13, California Code of Regulations) incorporating the proposed amendments.   This document contains only the portions of the regulation that are affected by the amendments and includes the strikeout/underline format to identify changes from the current regulation.  (PDF - 19K)





Final Regulation Order for HD OBD and OBD II Regulations

Here you will find the final regulation orders for the HD OBD and OBD II regulations, sections 1971.1, 1968.2, and 1971.5 of title 13, California Code of Regulations, approved by the Office of Administrative Law on May 18, 2010. The versions of sections 1971.1 and 1968.2 below include the "tracked changes" format to identify changes from the original regulations (additions are indicated by underline while deletions are indicated by strikeout).  


Other Documents in the Final Statement of Reasons package for HD OBD and OBD II 

Here you will find the documents that are part of the final rulemaking package for the HD OBD and OBD II regulations that was filed with the Office of Administrative Law on April 6, 2010.

  • Final Statement of Reasons: Summary of the adopted regulations and each objection and recommendation made by the public during the 45-Day and 15-Day comment periods. (PDF - 453K)
  • Updated Informative Digest: Summary of the regulations and the rulemaking process. (PDF - 29K)
  • Executive Order: Used when the Board approves the regulations with the 15-Day changes. (PDF - 29K)
  • Notice of Decision and Response to Significant Environmental Issues: (PDF - 34K)


Documents for the OBD 15-Day Notice: October 20, 2009

Here you will find the documents that detail the modifications and changes made to the staff's original proposed amendments to the OBD II and heavy-duty OBD regulations (Board Hearing date: May 28, 2009). Deadline for public comment on the changes: Friday, November 13, 2009.

  • Notice of Public Availability of Modified Text: The 15-Day Notice summarizing the changes to the regulations. The notice includes a summary of the Board's action, a list of the additional changes made to the original proposed amendments to the regulations, availability information of the attachment, and relevant dates. (PDF - 45K)
  • Attachment I: Modified Text of Sections 1968.2, 1971.1, and 1971.5: This document includes the double strikeout/underline format to identify additional changes to the original proposed amendments to the regulations made available to the public prior to the Board Hearing. (PDF - 136K)


ARB Mailout MSC #09-22: Dated July 7, 2009

ARB Mailout MSC #09-22, "Guidelines for Heavy-Duty On-Board Diagnostic (HD OBD) Certification Data," and its associated electronic templates can be found on the "OBD Updates" page here.


OBD Regulation Documents for the Board Hearing: May 28, 2009

ARB held a Board Hearing on May 28, 2009 to consider adoption of staff's proposed amendments to the OBD II and heavy-duty OBD regulations (sections 1968.2 and 1971.1 of title 13, California Code of Regulations) and adoption of a heavy-duty OBD enforcement regulation (proposed section 1971.5). Here you will find the regulatory documents pertaining to the Board Hearing:

  • Board Presentation: ARB Board Hearing presentation of the proposed regulation. (Powerpoint - 461K) or (PDF - 259K) 
  • Public Hearing Notice: Invitation to public and industry to discuss the proposed changes to the regulations. This notice includes the date, time, location, and a summary of the issues to be covered during the hearing. (PDF - 57K)
  • Staff Report: Initial Statement of Reasons (ISOR): Descriptions of the proposed requirements. (PDF - 594K)
  • Proposed Heavy-Duty OBD Regulation section 1971.1: The regulation (section 1971.1 of title 13, California Code of Regulations) incorporating the proposed amendments.  This document includes the strikeout/underline format to identify changes from the current regulation. (PDF - 625K)
  • Proposed OBD II Regulation section 1968.2: The regulation (section 1968.2 of title 13, California Code of Regulations) incorporating the proposed amendments.  This document includes the strikeout/underline format to identify changes from the current regulation. (PDF - 624K)
  • Proposed Heavy-Duty OBD Enforcement Regulation section 1971.5: The proposed enforcement regulation (section 1971.5 of title 13, California Code of Regulations).  (PDF - 158K)


Draft Regulation Language for Proposed Heavy-Duty OBD Enforcement Regulation (title 13, CCR section 1971.5): Dec 12, 2008

This is draft language of the proposed HD OBD enforcement regulation (section 1971.5, title13, California Code of Regulations). Please note that this is not the "finalized" regulation that ARB staff will be presenting at a future 2009 Board Hearing.

  • Draft Proposed Section 1971.5 - dated December 12, 2008: (Word - 245K)
  • Mandatory Recall Criteria Attachment: This Excel spreadsheet contains the proposed criteria for noncompliance determinations and possible mandatory recall. (Excel - 21K)


Documents for the Heavy-Duty OBD Workshop: October 15, 2008

ARB will hold a public workshop on October 15, 2008 to discuss its current position and proposals regarding heavy-duty OBD-related issues. Documents pertaining to the workshop can be found on the Workshop/Meetings website.



Final Regulation Order for HD OBD

Here you will find the final, OAL-approved clean version of the HD OBD regulation, section 1971.1 of title 13, California Code of Regulations. OAL approved the rulemaking and filed it with the Secretary of State on February 15, 2006, and the regulation became effective on March 17, 2006.

Other Documents in the Final Statement of Reasons package for HD OBD

Here you will find the documents that are part of the final rulemaking package for the HD OBD regulation that was filed wih the Office of Administrative Law on December 29, 2005 and approved on February 15, 2006.

  • Final Statement of Reasons: Summary of the adopted regulation and each objection and recommendation made by the public during the 45-Day and 15-Day comment periods. (PDF - 357K)
  • Updated Informative Digest: Summary of the regulation and the rulemaking process. (PDF - 21K)
  • Executive Order: Used when the Board approves the regulation with the 15-Day changes. (PDF - 7K)


Documents for the HD OBD 15-Day (Post-Hearing 45-Day) Notice

Here you will find the documents that detail the modifications and changes made to the staff's original proposed HD OBD regulation, including changes made since the Board Hearing (i.e., after the "Staff's Modifications to Proposed Regulations" available below). The original 15-day comment period has been extended to 45 days. Deadline for public comment on the changes: October 24, 2005.

  • Notice of Public Availability of Modified Text: The Post-Hearing 45-Day Notice summarizing the changes to the regulation. The notice includes a summary of the Board's action, a list of the changes made to the original proposed regulation, availability information of the attachments, and relevant dates. (PDF - 16K)
  • Attachment I: Resolution 05-38 (adopted at hearing): Resolution by the Board on 7/21/05 adopting the modifications to the regulation. (PDF - 74K)
    • Attachment A: Proposed HD OBD Regulation section 1971.1: Available below.
    • Attachment B: Staff's Suggested Modifications to Proposed Regulation: Available below.
  • Attachment II: Rationale of Proposed Modifications to section 1971.1: This document includes summarizations of and explanations for the modifications made to the original proposed regulation made available to the public prior to the Board Hearing. (PDF - 36K)
  • Attachment III: Modified Text of Proposed Section 1971.1: This document includes the strikeout/underline format to identify changes from the original proposed regulation made available to the public prior to the Board Hearing. (PDF - 497K)
  • Attachment IV: Revised Tables II-3 and II-4 of the Initial Statement of Reasons (ISOR): This document details corrections (denoted in the strikeout/underline format) to Tables II-3 and II-4 that were included as a part of the cost analysis in the ISOR (page 130). (PDF - 9K)


Heavy-Duty OBD Regulation Documents for the Board Hearing: July 21, 2005

ARB held a Board Hearing on July 21, 2005 to consider adoption of staff's proposed regulation for OBD systems on 2010 and subsequent model year heavy-duty engines. Here you will find the ARB presentation and regulatory documents pertaining to the Board Hearing:

  • Draft Staff's Suggested Modifications to Proposed Regulation: Draft of ARB's changes to the proposed regulation since its initial publication in response to public comments. This document includes the strikeout/underline format to identify changes from the proposed regulation made available to the public prior to the Board Hearing (and available below). However, this draft document is NOT the finalized version of the regulation that will be made available in August as part of the supplemental 45-Day Notice. (MS Word - 697K) or (PDF - 607K)
  • Board Presentation: ARB Board Hearing presentation of the proposed regulation. (Powerpoint - 697K) or (PDF - 290K)
  • Public Hearing Notice: Invitation to public and industry to discuss the proposed regulation. This notice includes the date, time, location, and a summary of the issues to be covered during the hearing. (PDF - 111K)
  • Staff Report: Initial Statement of Reasons (ISOR): Descriptions of the proposed requirements. (PDF - 799K)
  • Draft Proposed Heavy-Duty OBD Regulation: Draft proposed regulation section 1971.1 of title 13, California Code of Regulations (CCR). (PDF - 230K)


Documents from the Heavy-Duty OBD Workshop: February 16, 2005

ARB held a public workshop on February 16, 2005 to discuss its current position and proposals regarding heavy-duty OBD-related issues, including proposed amendments to the service information regulation related to the proposed heavy-duty OBD regulation. Here you will find the documents pertaining to the workshop:

  • Workshop Presentations: ARB workshop presentations of the proposed regulation.
  • Workshop Notice: Invitation (Mail-Out #MSC 05-01) to the public and industry to discuss the proposed heavy-duty OBD regulation and amendments to the service information regulation. This notice indicates the date (February 16), time, location, and a summary of the issues to be covered during the workshop. Attached to the end of the notice is a request form indicating how to obtain hard copies of the draft proposed OBD regulation, the summary guide of the draft OBD regulation, and the draft proposed amendments to the service information regulation. (MS Word - 50K) or (PDF - 87K)
  • Draft Proposed Heavy-Duty OBD Regulation: Draft proposed regulation section 1971.1 of title 13, California Code of Regulations (CCR). (MS Word - 628K) or (PDF - 481K)
  • Summary Guide of the Draft Proposed Regulation: A guide to understanding the draft proposed heavy-duty OBD regulation. This document is intended to provide a brief description of the various elements of the proposed regulation and some background information, rationale, and examples to better understand the regulation. (MS Word - 71K) or (PDF - 118K)
  • Draft Proposed Amendments to Service Information Regulation: Draft amendments to the service information regulation, section 1969 of title 13, CCR. (MS Word - 106K) or (PDF - 124K)

Final Regulation Order for EMD

Here you will find the final, OAL-approved clean version of the EMD regulation, section 1971 of title 13, California Code of Regulations. OAL approved the rulemaking and filed it with the Secretary of State on December 27, 2004, and the regulation became effective on December 30, 2004.

Other Documents in the Final Statement of Reasons package for EMD

Here you will find the documents that are part of the final rulemaking package for the EMD regulation.

  • Final Statement of Reasons: Summary of the adopted regulation and each objection and recommendation made by the public during the 45-Day and 15-Day comment periods. (MSW97 - 104K) or (PDF - 45K)
  • Updated Informative Digest: Summary of the regulation and the rulemaking process. (MSW97 - 34K) or (PDF - 10K)


Documents for the EMD 15-Day Notice

Here you will find the documents that detail the modifications and changes made to the staff's original proposed EMD regulation (which was made available at the Board Hearing as the "Staff's Modifications to Proposed Regulations" and is available below). Deadline for public comment on the changes: August 20, 2004.

  • Notice of Public Availability of Modified Text: The 15-Day Notice summarizing the changes to the regulation. The notice includes a summary of the Board's action, a list of the changes made to the original proposed regulation, availability information of the attachments, and relevant dates. (HTML) or (MS Word - 31K) or (PDF - 9K)
  • Attachment I: Resolution 04-16 (adopted at hearing): Resolution by the Board on 5/20/04 adopting the modifications to the regulation. (MS Word - 45K) or (PDF - 16K)
    • Attachment A: Proposed EMD Regulation section 1971: The originally proposed regulation that was made available with the Staff Report. (MS Word - 133K) or (PDF - 15K)
    • Attachment B: Staff's Modifications to Proposed Regulations: The regulation with ARB's changes that was made available during the Board Hearing. (MS Word - 133K) or (PDF - 17K)


Heavy-Duty Engine Manufacturer Diagnostic (EMD) System Regulation Documents for the Board Hearing: May 20, 2004

ARB held a Board Hearing on May 20, 2004, to propose heavy-duty EMD system requirements for adoption. Here you will find the ARB presentation and regulatory documents pertaining to the Board Hearing:

  • Staff's Suggested Modifications to Proposed Regulation: ARB's changes to the proposed regulation since its initial publication in response to public comments. This document includes the strikeout/underline format to identify changes from the proposed regulation made available to the public prior to the Board Hearing (and available below). This document was also made available at the Board Hearing. (MS Word - 123K) or (PDF - 18K)
  • Board Presentation: ARB Board Hearing presentation of the proposed regulation. (Powerpoint - 126K) or (PDF - 57K)
  • Public Hearing Notice: Invitation to public and industry to discuss the proposed regulation. This notice includes the date, time, location, and a summary of the issues to be covered during the hearing. (HTML) or (MSW97 - 50K) or (PDF - 23K)
  • Staff Report: Initial Statement of Reasons (ISOR): Descriptions of the proposed requirements. (MSW97 - 100K) or (PDF - 432K)
  • Proposed EMD Regulation section 1971: The proposed regulation section 1971 of title 13, CCR. (MSW97 - 113K) or (PDF - 14K)


Documents and Presentations from the Heavy-Duty OBD Workshop: October 16, 2003

ARB held a public workshop on October 16, 2003 to discuss its current position and proposals regarding heavy-duty OBD-related issues. Here you will find the ARB workshop presentations and documents pertaining to the workshop:

  • Workshop Presentations: ARB workshop presentations of the proposed regulation.
  • Revised Workshop Notice: Revised notice (Mail-Out #MSC 03-09) indicating the new date (October 16) and room location for the heavy-duty OBD workshop. (PDF - 243K)
  • Original Workshop Notice: Original invitation (Mail-Out #MSC 03-07) to the public and industry to discuss the proposed heavy-duty OBD regulation. This notice indicates the old date (August 13), time, location, and a summary of the issues to be covered during the workshop. Attached to the end of the notice is a request form indicating how to obtain hard copies of the draft staff report and regulation. (MS Word - 56K) or (PDF - 372K) (for notice) and (PDF - 43K) (for request form)
  • Draft Preliminary Staff Report: Descriptions of the proposed requirements in the regulation. (MS Word - 424K) or (PDF - 660K)
  • Draft Heavy-Duty OBD Regulation: Draft proposed regulatory language. (MS Word - 398K) or (PDF - 399K)

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