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On-Board Diagnostics (OBD)

Heavy Duty Vehicles

This page includes OBD resources for heavy duty vehicles.

Regulations

Final Rule: Regulations Requiring Onboard Diagnostic Systems on Highway Heavy-duty Engines used in Large Trucks; Revisions to Onboard Diagnostic Requirements for Diesel Highway Heavy-duty Engines used in Smaller Trucks (published February 24, 2009)

EPA is issuing a final rule to require Onboard Diagnostic (OBD) systems on heavy-duty engines used in vehicles weighing over 14,000 pounds. In addition, EPA is making changes to existing requirements for diesel highway heavy-duty vehicles under 14,000 pounds. EPA has established a public docket (Docket No. EPA-HQ-OAR-2005-0047) to view public comments and to access documents related to the development of the final rule. NOTE: To access the docket from this link, select Advanced Search, then Docket Search, and then type EPA-HQ-OAR-2005-0047 as the Docket ID.

Notice of Extension of Comment Period: Regulations Requiring Onboard Diagnostic Systems on 2010 and Later Heavy-duty Engines used in Highway Vehicles Over 14,000 Pounds; Revisions to Onboard Diagnostic Requirements for Diesel engines used in Highway Heavy-duty Vehicles Under 14,000 Pounds (published March 22, 2007)

Notice of Proposed Rule: Regulations Requiring Onboard Diagnostic Systems on 2010 and Later Heavy-duty Engines used in Highway Vehicles Over 14,000 Pounds; Revisions to Onboard Diagnostic Requirements for Diesel engines used in Highway Heavy-duty Vehicles Under 14,000 Pounds (published January 24, 2007)

This proposal would require the emissions control systems of large highway diesel and gasoline trucks to be monitored for malfunctions via an onboard diagnostic system (OBD), similar to those systems that have been required on passenger cars since the mid-1990s. In addition to these proposed requirements and changes, we are seeking comment on possible future regulations that would require OBD systems on heavy-duty diesel engines used in nonroad equipment (e.g., construction, industrial, agricultural). This proposal also makes changes to certain existing OBD requirements for smaller highway heavy-duty diesel trucks. The proposal is EPA Docket No. EPA-HQ-OAR-2005-0047 and comments on this rule are due to EPA 60 days after publication of the Notice of Proposed Rulemaking in the Federal Register.

The EPA is issuing a notice of proposed rulemaking to require Onboard Diagnostic (OBD) systems on heavy-duty engines used in highway vehicles weighing over 14,000 pounds. In addition, EPA is proposing changes to existing requirements for diesel engines used in highway heavy-duty vehicles under 14,000 pounds.

Final Rule (published October 6, 2000) - Control of Emissions of Air Pollution from 2004 and Later Model Year Heavy-duty Highway Engines and Vehicles

Contact:
Todd Sherwood
Phone: 734-214-4405
E-mail: sherwood.todd@epa.gov

This page is maintained by EPA's Office of Transportation and Air Quality (OTAQ).
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