A "Clean Truck Inspection" in California, also known as a "Clean Truck Check" or "Heavy-Duty Vehicle Inspection and Maintenance, is a program mandated by the California Air Resources Board (CARB) to ensure that heavy-duty vehicles operating in the state have properly functioning emissions control systems, requiring periodic emissions testing and compliance checks on trucks exceeding >14,001 lbs GVWR.
The testing occurs semi-annually corresponding with the last digit of the vehicle’s VIN. In 2027, the testing frequency will increase to quarterly.
Passing the inspection results in a sticker being placed on the vehicle. The California Highway Patrol is authorized to have any required vehicle not possessing the current passing sticker immediately removed from operation.
The cost of the inspection is born by the owner. In addition, CARB requires an annual fee for all vehicles covered by the program. Fleet Services will pay that fee and recharge departments accordingly.
Test due dates are based upon the last number of the VIN. The first month listed denotes the month the annual participation fee must be paid.
0 = April & October
1 = May & November
2 = June & December
3 = July & January
4 = August & February
5 = September & March
6 = October & April
7 = November & May
8 = December & June
9 = January & July