Periodic Smoke Inspection Program (PSIP)
The California Air Resources Board implemented the Periodic Smoke Inspection Program in 1998.
All California-based fleets with two or more heavy-duty diesel vehicles.
All diesel trucks and buses meeting the following criteria:
- 1997 and older diesel vehicles with GVWR rating over 6,000 pounds
- 1998 and newer diesel vehicles with GVWR rating over 14,000 pounds
- Vehicles that more than four years old
A fleet owner that neglects to comply with the CARB-mandated Periodic Smoke Inspection Program (PSIP) is subject to penalties starting at $500.00 per vehicle, per year of non-compliance.