California's Clean Truck Check program applies to nearly all heavy-duty vehicles over 14,000 lbs operating in California:

✓ Semi trucks & tractor-trailers
✓ Box trucks & delivery vehicles
✓ Dump trucks & construction equipment
✓ Buses (transit, school, motorcoach)
✓ Diesel motorhomes (California-registered)
✓ Alternative fuel vehicles
✓ Out-of-state registered vehicles that operate in California

Testing Frequency:

• Commercial vehicles: Twice per year (semi-annual)

• California motorhomes: Once per year

• Agricultural vehicles: Once per year

Our Specialty:

We test 2013 and newer vehicles with OBD systems. If your vehicle is a 2012 or older diesel without OBD, you'll need smoke opacity testing (not offered by California Transit Services).

When to Test:

You can submit passing test results up to 90 days BEFORE your deadline. We recommend testing 60-90 days early to allow time for repairs if needed.

California-Registered Vehicles:
Deadlines are based on your DMV registration expiration date:

• 1st deadline: DMV registration expiration date

• 2nd deadline: 6 months after expiration date

Example: If your registration expires January 15th, your deadlines are January 15th and July 15th.

Out-of-State Vehicles:
Deadlines are based on the last digit of your VIN:

VIN Last Digit | Deadline Month
1 | January 31 & July 31
2 | February 28 & August 31
3 | March 31 & September 30
4 | April 30 & October 31
5 | May 31 & November 30
6 | June 30 & December 31
7 | January 31 & July 31
8 | February 28 & August 31
9 | March 31 & September 30
0 | April 30 & October 31

Penalties for Non-Compliance:

• Fines starting at $1,000+ per day per vehicle

• DMV registration holds (cannot renew registration)

• Denied entry to California ports and railyards

• Roadside enforcement citations

Don't risk it - schedule your test today!

Q: How long does OBD testing take?
A: Approximately 20 minutes for most vehicles.

Q: What if my truck fails?
A: We provide a detailed diagnostic report. After you complete repairs at a qualified shop, return within 30 days for a FREE re-test.

Q: Can you do repairs if my truck fails?
A: No. California law prohibits testing facilities from performing repairs to prevent conflicts of interest. We can refer you to trusted repair shops.

Q: Do you offer mobile testing?
A: Yes! We come to your location throughout LA, San Bernardino, Riverside, and Orange Counties. Advance reservation required.

Q: What are your hours?
A: Monday through Friday, 5:00 AM to 1:00 PM, by appointment only.

Q: Can I get tested early before my deadline?
A: Absolutely! You can test up to 90 days before your deadline. We strongly recommend early testing.

Q: What do I need to bring?
A: Vehicle registration, VIN, and proof of the annual CARB compliance fee payment.

Q: Do you test older trucks (pre-2013)?
A: We specialize in OBD testing for 2013+ vehicles. Pre-2013 trucks require smoke opacity testing, which we don't provide.

Q: How do I know my testing deadline?
A: Check the CARB Clean Truck Check portal at cleantruckcheck.arb.ca.gov or call us at (626) 214-5220 - we can help you determine your deadline.

Q: What vehicles are exempt?
A: Zero-emission vehicles (full electric), certain low-NOx engines, and some agricultural equipment. Check with CARB for specific exemptions.

Q: Do you offer fleet discounts?
A: Yes! We have special pricing for fleets testing 2+ vehicles. See our Fleet Advantage Program above.