---
title: "Campbell Forest — Clean Truck Check, Pioneer, CA"
description: "Campbell Forest in Pioneer, 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/campbell-forest-pioneer/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Campbell Forest

Clean Truck Check tester in Pioneer, CA (Amador 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 | Pioneer, CA 95666 |
| County | Amador County |
| Phone | (209) 256-4662 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Campbell Forest 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 Mobile Carb Testing in Pioneer, about 1 mile away. [See listing](https://ctcfinder.com/tester/mobile-carb-testing-pioneer/).

## Clean Truck Check testers in Amador County

Campbell Forest is one of 7 testing businesses in Amador County on CARB's public tester list. 6 of them offer mobile testing and 4 do smoke opacity tests. In Pioneer itself there are 4 listed businesses, 4 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 Campbell Forest offer mobile Clean Truck Check testing?

Yes. Campbell Forest 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 Campbell Forest test a 2012 or older diesel truck?

Campbell Forest does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Mobile Carb Testing](https://ctcfinder.com/tester/mobile-carb-testing-pioneer/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Campbell Forest charge for a Clean Truck Check?

Campbell Forest has not published prices with us; call (209) 256-4662 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 Campbell Forest a CARB-credentialed tester?

Campbell Forest 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

- **[Dakotacal LLC](https://ctcfinder.com/tester/dakotacal-llc-pioneer/)** — 17019 Pine Needle Dr, Pioneer, CA 95666 — (209) 429-0940 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Mobile Carb Testing](https://ctcfinder.com/tester/mobile-carb-testing-pioneer/)** — 27382 State Highway 88, Pioneer, CA 95666 — (408) 406-7796 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Patriot Diesel and Equipment](https://ctcfinder.com/tester/patriot-diesel-and-equipment-pioneer/)** — 22588 State Highway 88, Pioneer, CA 95666 — (209) 256-5787 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Olson & Sons Industrial LLC](https://ctcfinder.com/tester/olson-and-sons-industrial-llc-pollock-pines/)** — 6520 Bandit Ct, Pollock Pines, CA 95726 — (530) 363-5651 — 16 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Robles Hard NOX](https://ctcfinder.com/tester/robles-hard-nox-pollock-pines/)** — Pollock Pines, CA 95726 — (530) 957-7313 — 16 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.