---
title: "GK's Clean Truck — Clean Truck Check, Atascadero, CA"
description: "GK's Clean Truck in Atascadero, 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/gks-clean-truck-atascadero/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# GK's Clean Truck

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 | 1500 N Ferrocarril Rd, Atascadero, CA 93422 |
| County | San Luis Obispo County |
| Phone | (805) 538-4991 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks GK's Clean Truck 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 San Luis Obispo County

GK's Clean Truck 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 GK's Clean Truck offer mobile Clean Truck Check testing?

Yes. GK's Clean Truck 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 GK's Clean Truck test a 2012 or older diesel truck?

Yes. GK's Clean Truck 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 GK's Clean Truck charge for a Clean Truck Check?

GK's Clean Truck has not published prices with us; call (805) 538-4991 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 GK's Clean Truck a CARB-credentialed tester?

GK's Clean Truck 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.
- **[Darrell Dillard](https://ctcfinder.com/tester/darrell-dillard-atascadero/)** — Atascadero, CA 93422 — (805) 674-8110 — 1 mi. Services: mobile testing, 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.