---
title: "Darrell Dillard — Clean Truck Check, Atascadero, CA"
description: "Darrell Dillard in Atascadero, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and nearby…"
url: "https://ctcfinder.com/tester/darrell-dillard-atascadero/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Darrell Dillard

Clean Truck Check tester in Atascadero, CA (San Luis Obispo 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 | Atascadero, CA 93422 |
| County | San Luis Obispo County |
| Phone | (805) 674-8110 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Darrell Dillard 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 | Not listed |
| California-registered motorhome | Same test as above by engine year, once a year | Yes |

For a 2012 or older diesel, the nearest listed tester with smoke opacity testing is Affordable Auto Care in Atascadero, about 1 mile away. [See listing](https://ctcfinder.com/tester/affordable-auto-care-atascadero/).

## Clean Truck Check testers in San Luis Obispo County

Darrell Dillard is one of 25 testing businesses in San Luis Obispo County on CARB's public tester list. 22 of them offer mobile testing and 9 do smoke opacity tests. In Atascadero itself there are 6 listed businesses, 6 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 Darrell Dillard offer mobile Clean Truck Check testing?

Yes. Darrell Dillard 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 Darrell Dillard test a 2012 or older diesel truck?

Darrell Dillard does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Affordable Auto Care](https://ctcfinder.com/tester/affordable-auto-care-atascadero/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Darrell Dillard charge for a Clean Truck Check?

Darrell Dillard has not published prices with us; call (805) 674-8110 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 Darrell Dillard a CARB-credentialed tester?

Darrell Dillard 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

- **[Affordable Auto Care](https://ctcfinder.com/tester/affordable-auto-care-atascadero/)** — 4495 Traffic Way, Atascadero, CA 93422 — (805) 258-1495 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Bennett Diesel Repair](https://ctcfinder.com/tester/bennett-diesel-repair-atascadero/)** — 3355 Chico Rd, Atascadero, CA 93422 — (805) 423-6132 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[GK's Clean Truck](https://ctcfinder.com/tester/gks-clean-truck-atascadero/)** — 1500 N Ferrocarril Rd, Atascadero, CA 93422 — (805) 538-4991 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Jeff's Auto Works](https://ctcfinder.com/tester/jeffs-auto-works-atascadero/)** — 9000 El Camino Real, Atascadero, CA 93422 — (805) 459-7830 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Specialized Equipment Repair](https://ctcfinder.com/tester/specialized-equipment-repair-atascadero/)** — 9005 El Camino Real, Atascadero, CA 93422 — (805) 466-1066 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Mtech Unlimited](https://ctcfinder.com/tester/mtech-unlimited-templeton/)** — Templeton, CA 93465 — (805) 550-8744 — 6 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.