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Diesel Questions - Need Help?


 

Staff are available to provide compliance assistance for ARB’s heavy-duty diesel vehicle regulations. To get your questions answered:

  • - First, see our quick tips below.
  • - If you still have questions, contact us through the Diesel Hotline Assistance Form. Or call the Diesel Hotline!
 


See our best all-in-one document the Multi-Regulation Summary.

 

To view common questions and answers, see our Hot Topics page.

See printer-friendly regulation information on the Outreach Materials & Factsheets page.

Find everything there is to know about PM filters at the PM Filter Information Hub.



- Fill out the Diesel Hotline Assistance Form.
- Reponse time averages one to three business days.
- Replies may be delayed during our busiest times:
 -  Calls and emails are answered in the order they are received. Wait and response times are longest near compliance and reporting deadlines, so contact us early!


To receive help by phone or by email, fill out the Diesel Hotline Assistance Form or contact us at 1-866-6Diesel (1-866-634-3735).

Remember:
 -  Staff are available to answer questions in English, Spanish or Punjabi.
 - Calls are answered between 8:00 a.m. and 5:00 p.m, Monday through Friday; you can leave a voicemail after business hours.
 - Calls and emails are answered in the order they are received. Wait and response times are longest near compliance and reporting deadlines, so contact us early!


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Diesel Hotline: 1-866-6DIESEL (1-866-634-3735)
 
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