---
title: "Great Western Unlimited — Clean Truck Check, Roseville, CA"
description: "Great Western Unlimited in Roseville, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing…"
url: "https://ctcfinder.com/tester/great-western-unlimited-roseville/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Great Western Unlimited

Clean Truck Check tester in Roseville, CA (Placer 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 | 9616 Antelope Oaks Ct, Roseville, CA 95747 |
| County | Placer County |
| Phone | (916) 827-5042 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Great Western Unlimited 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 Placer County

Great Western Unlimited is one of 39 testing businesses in Placer County on CARB's public tester list. 36 of them offer mobile testing and 22 do smoke opacity tests. In Roseville itself there are 12 listed businesses, 11 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 Great Western Unlimited offer mobile Clean Truck Check testing?

Yes. Great Western Unlimited 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 Great Western Unlimited test a 2012 or older diesel truck?

Yes. Great Western Unlimited 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 Great Western Unlimited charge for a Clean Truck Check?

Great Western Unlimited has not published prices with us; call (916) 827-5042 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 Great Western Unlimited a CARB-credentialed tester?

Great Western Unlimited 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

- **[carbdieseltest.com](https://ctcfinder.com/tester/carbdieseltest-com-roseville/)** — 2272 Longview Dr, Roseville, CA 95747 — (916) 538-7777 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Mobile Clean Truck Check LLC](https://ctcfinder.com/tester/mobile-clean-truck-check-llc-roseville/)** — 301 Bayonne Ct, Roseville, CA 95747 — (916) 743-9235 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Ranjeet](https://ctcfinder.com/tester/ranjeet-roseville/)** — 4032 Knobby Crest Way, Roseville, CA 95747 — (812) 581-6253 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Sebastian Fuentes Martinez](https://ctcfinder.com/tester/sebastian-fuentes-martinez-roseville/)** — Roseville, CA 95747 — (916) 410-1360 — 1 mi. Services: not listed.
- **[Trevor Lightfoot](https://ctcfinder.com/tester/trevor-lightfoot-roseville/)** — Roseville, CA 95747 — (530) 368-0341 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Yaroslav Maksymchuk](https://ctcfinder.com/tester/yaroslav-maksymchuk-roseville/)** — Roseville, CA 95747 — (916) 628-7740 — 1 mi. Services: mobile testing, OBD testing.