---
title: "David Hartfield III — Clean Truck Check, Vallejo, CA"
description: "David Hartfield III in Vallejo, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome…"
url: "https://ctcfinder.com/tester/david-hartfield-iii-vallejo/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# David Hartfield III

Clean Truck Check tester in Vallejo, CA (Solano County).

> CTC Finder is an independent directory, not affiliated with CARB. Tester data: CARB Clean Truck Check public tester list, last checked November 1, 2026. Confirm services, hours and prices with the tester.

| Field | Value |
|---|---|
| Location | Vallejo, CA 94591 |
| County | Solano County |
| Phone | (510) 707-3344 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks David Hartfield III can test

| Your vehicle | Test required | This tester |
|---|---|---|
| Diesel, model year 2013 or newer | OBD scan | Yes |
| Alternative fuel (natural gas, propane), 2018 or newer | OBD scan | Yes |
| Diesel, model year 2012 or older (no OBD) | Smoke opacity test (SAE J1667) plus visual inspection | Yes |
| California-registered motorhome | Same test as above by engine year, once a year | Yes |

## Clean Truck Check testers in Solano County

David Hartfield III is one of 38 testing businesses in Solano County on CARB's public tester list. 34 of them offer mobile testing and 21 do smoke opacity tests. In Vallejo itself there are 8 listed businesses, 7 of them mobile.

## When your truck is due

Most trucks test twice a year, on a schedule tied to the DMV registration expiration date. CARB says OBD trucks move to four tests a year beginning October 2027. California-registered (non-commercial) motorhomes and agricultural vehicles test once a year. See the [deadline guide](https://ctcfinder.com/guide/deadlines-2026-2027/). You can test up to 90 days before a deadline. Free email reminders: https://ctcfinder.com/reminders/

## Frequently asked questions

### Does David Hartfield III offer mobile Clean Truck Check testing?

Yes. David Hartfield III says on CARB's tester list that it offers mobile testing, so it can come to your yard or job site. Ask about a trip fee when you call.

### Can David Hartfield III test a 2012 or older diesel truck?

Yes. David Hartfield III lists smoke opacity testing, the test CARB requires for diesel trucks of model year 2012 and older (no OBD). See [OBD vs smoke opacity](https://ctcfinder.com/guide/obd-vs-smoke-opacity-test/).

### How much does David Hartfield III charge for a Clean Truck Check?

David Hartfield III has not published prices with us; call (510) 707-3344 for a quote. Published California prices are usually $50–$135 per vehicle for an OBD test and $190–$200 for a smoke opacity test, plus CARB's annual fee ($32.13 in 2026). See the [cost guide](https://ctcfinder.com/guide/cost/).

### Is David Hartfield III a CARB-credentialed tester?

David Hartfield III appears on CARB's public Clean Truck Check tester list, last checked November 1, 2026. Only credentialed testers can submit results to CARB; after the test, confirm the passing result shows for your vehicle in CTC-VIS.

## Other testers nearby

- **[DDK Enterprises INC](https://ctcfinder.com/tester/ddk-enterprises-inc-vallejo/)** — 8012 Vertine Ct, Vallejo, CA 94591 — (510) 563-7016 — 1 mi. Services: mobile testing, OBD testing.
- **[Primos Mobile Truck & RV Testing](https://ctcfinder.com/tester/primos-mobile-truck-and-rv-testing-vallejo/)** — 1127 Belmont Ave, Vallejo, CA 94591 — (707) 310-1367 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[ECS Mobile Services](https://ctcfinder.com/tester/ecs-mobile-services-vallejo/)** — 179 Coloma Way, Vallejo, CA 94589 — (707) 398-8574 — 3 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Michael's Transportation Service Inc.](https://ctcfinder.com/tester/michaels-transportation-service-inc-vallejo/)** — 140 Yolano Dr, Vallejo, CA 94589 — (707) 712-6713 — 3 mi. Services: not listed.
- **[Days Smog& DMV Registration Services](https://ctcfinder.com/tester/days-smog-and-dmv-registration-services-vallejo/)** — 1624 Broadway St, Vallejo, CA 94590 — (707) 997-0420 — 4 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Touch Trucking LLC](https://ctcfinder.com/tester/touch-trucking-llc-vallejo/)** — 301 Greenfield Ave, Vallejo, CA 94590 — (510) 496-1005 — 4 mi. Services: mobile testing, OBD testing.