   
  
G/TBT/N/USA/1403/Add.2  
 
12 October 2023  
(23-6845) Page: 1/1 
Committee on Technical Barriers to Trade  Original: English  
 
 
NOTIFICATION  
Addendum  
The following communication , dated  12 October 2023, is being circulated at the request of the 
delegation of the United States of America . 
 
_______________  
Title:  Heavy Duty Engine On -Board Diagnostic System Requirements  
 
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[ ] Notified measure withdrawn or revoked - date:  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:   
[ ] Content or scope of notified measure changed  and text available from1:  
New deadline for comments (if applicable):   
[X] Interpretive guidance issued and text available from1:  
Guidance for On -Board Diagnostic (OBD) Testing Reporting Documentation - California Air 
Resources Board (CARB) Mail -Out # ECCD 202 3-01: 
https://ww2.arb.ca.gov/sites/default/files/classic/msprog/nvepb/mailouts/_ECC/ecc202301/eccd2
02301.pdf  
https://members.wto.org/crnattachments/2023/TBT/USA/interpretative_guidance/23_12954_00_
e.pdf 
[ ] Other:  
 
Description:  CARB staff has published CARB Mail -Out # ECCD 2023 -01, "Guidance for On -Board 
Diagnostic II and Heavy -Duty On -Board Diagnostic Production Vehicle/Engine Evaluation Testing 
and Manufacturer Self -Testing Reporting Documentation." This document contains details on CARB -
developed templates that manufacturers may  use to report the testing result information required 
by the OBD II and heavy -duty OBD regulations. Specifically, the templates were developed for the 
results information for production vehicle/engine evaluation testing and manufacturer self -testing.  
Information regarding CARB's On -Board Diagnostic Program can be found online at 
https://ww2.arb.ca.gov/our -work/programs/obd . Resources about the program are availab le at 
https://ww2.arb.ca.gov/resources/documents/obd -resources . 
__________  
 
 
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.  