Recommended · Featured Partner
5— on Google ReviewsSmart CTC
Test your truck ANYWHERE in the USA, Canada or Mexico without scheduling shop visits or mobile testers.
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Find a CARB-credentialed
Clean Truck Check tester
A nationwide directory of credentialed testers updated weekly from the official CARB HDIM database.
Every listing is a CARB-credentialed Clean Truck Check tester.
Featured partners
Recommended testers
Operator-recommended options that work for most fleets — remote testing nationwide, plus mobile testing across Southern California.
Recommended · Featured Partner
5— on Google ReviewsClean Truck Check Pro
Mobile CARB-credentialed Clean Truck Check testing serving Southern California.
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Resources
Learn more
Background on the program, the 2027 changes, and a calculator for your next test date.
What is Clean Truck Check?Who must comply, fees, deadlines, and penalties — in plain English.Compare testing optionsIn-shop, mobile, and device testing: cost, downtime, and when each wins.2027 testing changesThe quarterly-cadence transition starting Oct 2027 — what to expect.Test deadline calculatorFind your next test date from your truck's last compliance date.