CARB Clean Truck
Check Testing.At Your Yard.

California's emissions compliance program for non-gasoline heavy-duty vehicles over 14,000 lbs GVWR that operate in California. Most affected OBD-equipped vehicles need periodic OBD testing; older or non-OBD vehicles may need smoke opacity/visual inspection. Testing frequency and exemptions depend on vehicle type, model year, and CARB rules. We currently perform OBD testing only.

If your vehicle is over 14,000 lbs GVWR, runs on diesel/alternative fuel/hybrid, and operates on California public roads, you likely do. Use our Vehicle Lookup — enter your VIN and we'll check scope, exemptions, and tell you which test applies.

The official OBD test is performed with a CARB-approved device by a credentialed tester, but at your yard, lot, or jobsite instead of a fixed shop. Mobile service can reduce driving and waiting time, but CARB still determines the official result.

You get a written report with the fault details and readiness status shown by the test device. A qualified mechanic should diagnose and repair the truck. If you picked the Pre-check Bundle, the first visit is private and not submitted to CARB. If an official test fails, CARB receives that official result. The retest service fee is waived for 14 days on eligible OBD retests; travel still applies outside our free radius.

The pre-check screens for active and permanent faults, readiness monitors that are not complete, recently cleared codes, VIN/eVIN mismatch, communication problems, missing aftertreatment data, and obvious tamper or deleted-emissions red flags. It reduces surprise failures, but it does not guarantee CARB will return a pass.

For OBD-equipped trucks, the official test result is transmitted directly to CARB through our approved test device. You usually do not need to manually upload that OBD result. Owners are still responsible for keeping vehicles registered in CTC-VIS, paying CARB fees, meeting deadlines, and handling any CARB follow-up.

Referee Referral is a CARB-directed result, not a mobile tester decision. It can happen when CARB sees an OBD, calibration, VIN/eVIN, or emissions-configuration issue that needs referee review. The official test fee still applies because the test was performed and submitted. Repairs, referee appointments, referee fees, and any later retest are the vehicle owner's responsibility.

Sometimes it can catch warning signs before official submission, especially a blank report, short or mismatched eVIN, communication issue, readiness problem, active/permanent faults, or deleted-emissions indicators. It cannot guarantee no referral because CARB makes the final determination after the official submission.

If your truck has a retrofit device, it should match CARB's Verified Diesel Emission Control Strategy (VDECS) list and be properly labeled/maintained. We can point you to the CARB list, but we are not a retrofit installer or repair shop. A non-verified, missing, modified, or tampered emissions system can create Clean Truck Check failure and enforcement risk.

Test fee + travel. That's it. No hidden equipment fee, no surprise dispatch charge. Travel is free within 30 miles of Mira Mesa; beyond that, $1.25/mi round trip (covers fuel, vehicle wear, and our time on the road).

Yes. Small fleet 2–9 trucks: lower per-truck rates when grouped in one visit. Large fleet 10+: lower per-truck rates, recurring scheduling when available, and fleet summary reports on request.