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CARB Diesel Test

CARB Testing in Davis

Mobile CARB testing across Davis and Yolo County

Ag haulers, university fleets, and owner-operators in Davis get certified Clean Truck Check testing on-site at their yard, farm, or home.

CARB Credentialed Tester
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OBD & OVI Certified
Mobile Service Available

Mobile CARB testing for Davis

Davis sits at the crossroads of UC Davis research, Yolo County agriculture, and commuter-residential neighborhoods. All three generate heavy-duty diesel vehicles that fall under the CARB Clean Truck Check program. Our mobile service handles them all without requiring a cross-valley drive.

Where we dispatch in Davis

We regularly serve the I-80 commercial corridor, agricultural operations throughout Yolo County (including Woodland, Winters, and Dixon when scheduled together), residential addresses across central and east Davis, and institutional fleets when access permits.

Ag and research operations

Yolo County’s agricultural footprint is substantial, and the trucks that move the produce, specialty crops, and field equipment tied to it include a mix of modern OBD-capable rigs and older pre-2013 equipment. We bring both test types in one visit. University-affiliated research fleets and municipal vehicles also benefit from on-site testing to avoid moving specialized equipment.

Owner-operators and RV owners

Davis residential streets have their share of owner-operator trucks and heavy-duty motorhomes, and we service both at home addresses with minimal disruption. The test takes 15 to 35 minutes depending on type, and we upload compliance before leaving.

Book your Davis visit

Davis is one of our faster-turnaround locations thanks to its proximity to Sacramento. Call us to schedule and we will confirm within the hour during business hours.

Local landmarks we dispatch near

  • UC Davis campus and research farms
  • I-80 commercial corridor
  • Covell Boulevard commercial area
  • Yolo Bypass Wildlife Area routes
  • Davis Central Park district

Davis industries we serve

  • Yolo County agricultural fleets
  • University and research vehicle fleets
  • Produce and specialty-crop haulers
  • Residential RV and motorhome owners
  • Municipal utility vehicles

Frequently asked questions

Do you service ag operations in Yolo County outside Davis proper?
Yes. We regularly dispatch to farms, orchards, and ag yards across Yolo County, including Woodland, Winters, and Dixon. Provide the address and we will schedule accordingly.
Can you test university or research fleet vehicles at UC Davis?
In principle yes, subject to the university's access and scheduling requirements. We have worked with institutional fleets and can coordinate with your facilities team.
What is the drive from Sacramento to Davis?
About 20 to 25 minutes in normal traffic. We schedule Davis visits quickly and often batch with other Yolo County stops.
Does my Davis truck need an OBD or OVI test?
It depends on your engine model year. Diesel engines from 2013 and newer take the electronic OBD test, and 2012 and older engines take the OVI smoke opacity and visual inspection. We are credentialed for both and bring the right equipment based on the engines you tell us about when booking your Davis visit.
How much does CARB Clean Truck Check testing cost in Davis?
There are two parts. CARB charges an annual compliance fee of $32.13 per vehicle in 2026, paid to the state. Separately, you pay for the test itself, which depends on the test type and vehicle count. Mobile pricing is consistent across our coverage area, and fleets scheduling several trucks in one visit qualify for volume rates. Call (916) 538-7777 for a quote.
How fast does a Davis test clear my DMV registration hold?
For 2013 and newer engines passing the OBD test, we upload results during the visit and CARB releases compliance to the DMV the same business day in most cases, so a Davis-registered rig can come off its hold within hours. OVI results take several business days for CARB to process.
What happens if my Davis truck fails the test?
A failed test carries no fine by itself, but your DMV hold stays until you repair the issue and pass a retest. We tell you exactly what failed, point you to the specific OBD trouble code or OVI finding, and can recommend trusted diesel repair shops in the Davis and Yolo County area. Once the fix is done, we come back and retest.
Are you actually CARB credentialed?
Yes. We are credentialed by the California Air Resources Board for both OBD testing and OVI opacity testing, and our credentials are verifiable on the CARB Clean Truck Check program registry. We provide credential numbers on request before any service visit.

Book Davis mobile testing

Get a tester on your Davis site

Tell us about your vehicles. We respond within 2 hours during business hours.

Or call us directly at (916) 538-7777. We typically respond within 2 hours during business hours.

Ready for mobile CARB testing in Davis?

One call books one truck or an entire fleet.

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