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Testing that fits your schedule
Book a test for one vehicle or coordinate testing for your fleet. Not sure which test you need? Call us before booking.
Book a truck test
Mobile OBD and smoke opacity testing across Los Angeles, Orange County, Riverside, the Inland Empire and North San Diego County.
Arrange fleet testing
Share your vehicle count, engine years, location and deadlines. We help coordinate OBD and opacity testing in one plan.
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WHERE WE SERVE
Mobile testing across Southern California
Choose where we test
• Orange County
• Riverside County
• Inland Empire
• North San Diego County
Based elsewhere. Operating in California?
BEFORE YOU BOOK
Clean Truck Check questions, answered
Need more detail? Browse testing questions and preparation resources, with links to official CARB guidance.
Clean Truck Check is California's heavy-duty vehicle emissions inspection program, also called HD I/M. A test is one part of compliance; vehicle reporting and required CARB fees must also be up to date.
Most diesel and alternative-fuel vehicles over 14,000 pounds GVWR operating on California public roads are covered, including many out-of-state vehicles. Exemptions apply. The engine model year and fuel type help determine the test type.
OBD-equipped 2013+ diesel and 2018+ alternative-fuel engines use OBD testing. Most 2012 and older diesel engines need smoke opacity plus a visual inspection. Older alternative-fuel engines need a visual inspection only. Use the engine model year, not just the truck model year; special configurations need review.
Check the vehicle record in your official CARB CTC-VIS account. Testing schedules vary by vehicle category, and passing a test does not replace reporting or annual fee requirements. Our testing guide explains what to check before booking.
Review the result with the tester and arrange any needed repairs before retesting. A failed result is different from Not Ready. Recently cleared codes or a battery disconnection can affect readiness, so tell the tester about recent work. Do not clear codes simply to prepare for a test.
Need help choosing a test? Read our Clean Truck Check testing and preparation guide. Requirements are based on CARB guidance; check your official CTC-VIS vehicle record for your deadline.
