Heavy-Duty Vehicle Inspection Program (HDVIP)
All heavy-duty trucks and buses operating in California are subject to HDVIP roadside inspections by CARB staff. This includes vehicles registered in other states or foreign countries. CARB inspectors may conduct unannounced tests at border crossings, CHP weigh stations, fleet facilities, and randomly selected roadside locations. Vehicles are inspected for excessive smoke and tampering, and engine certification label compliance. Owners of trucks and buses found in violation are subject to minimum penalties starting at $300 per violation.
For program details view the HDVIP Pamphlet
Periodic Smoke Inspection Program (PSIP)
PSIP is an annual self-testing program for smoke opacity and is applicable to California-based fleets of two or more heavy-duty diesel vehicles. The PSIP program requires that fleet owners conduct annual smoke opacity inspections of their HD diesel vehicles and repair those with excessive smoke emissions to ensure compliance. CARB randomly audits fleets maintenance and inspection records and tests a representative sample of vehicles. All vehicles that do not pass the test must be repaired and retested. All testing records must be maintained for a period of two years. A fleet owner that neglects to perform the annual smoke opacity inspection on applicable vehicles is subject to a penalty of $500.00 per vehicle, per year.
Beginning January 1, 2010, Assembly Bill 1488 (Mendoza) has required diesel vehicles (passenger cars and trucks) manufactured after model year 1997 with a gross vehicle weight rating (GVWR) of 14,000 pounds or less to be included in the California Smog Check Program.
For program details, view the PSIP Pamphlet at: https://www.arb.ca.gov/enf/hdvip/psip_pamphlet.pdf
and the related Advisory 351: Enforcement of California's Periodic Smoke Inspection Program (PSIP)