top of page

CARB Heavy-Duty Inspection and Maintenance Program 

The Heavy-Duty Inspection and Maintenance Program (HD I/M) has been rebranded to the Clean Truck Check. 91 Bravo is committed to Reducing truck emissions with convenient testing options.

Clean Truck Check Logo

Testing Frequency 

  • OBD-equipped vehicles: 2 times per year, increasing to 4 times per year after 3 years

  • Non-OBD equipped vehicles: 2 times per year

  • Agricultural vehicles and California-registered motorhomes: once per year


  • Keeps trucks operating at maximum efficiency, saving fuel and other costs.

  • Streamlined testing with minimal downtime.

  • Ensures trucks operate cleanly, improving air quality in communities where trucks are common.

  • Ensures all trucks operating in California meet the same standards.

  • Assures the ability to renew Department of Motor Vehicles (DMV) registration.

The Clean Truck Check requires all diesel and alternative fuel trucks and buses with a gross vehicle weight rating (GVWR) over 14,000 pounds, including out-of-state and out-of-country vehicles,  California motorhomes, and agricultural vehicles, to:

  • be regularly tested to ensure all emissions-related equipment is functioning properly.

  • report the testing data to CARB.

  • pay a compliance fee of $30 per year per vehicle.


Receive the latest updates regarding the Clean Truck Check (Heavy-Duty Inspection and Maintenance)

bottom of page