--- title: "Clean Truck Check Testers in Pioneer, CA (4 listed)" description: "Find 4 CARB-credentialed Clean Truck Check testers in Pioneer, Amador County: 4 offer mobile testing, 2 do smoke opacity tests. Phone numbers, services and…" url: "https://ctcfinder.com/testers/amador-county/pioneer/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in Pioneer, CA 4 testing businesses in Pioneer (Amador County) are on CARB's public Clean Truck Check tester list (4 credentialed testers). 4 offer mobile testing, 2 do smoke opacity tests, 4 test motorhomes. > 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. ## Testers in Pioneer - **[Campbell Forest](https://ctcfinder.com/tester/campbell-forest-pioneer/)** — Pioneer, CA 95666 — (209) 256-4662. Services: mobile testing, OBD testing, motorhome testing. - **[Dakotacal LLC](https://ctcfinder.com/tester/dakotacal-llc-pioneer/)** — 17019 Pine Needle Dr, Pioneer, CA 95666 — (209) 429-0940. 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. 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. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. ## More testers within 20 miles - **[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. ## Cost Typical published prices in California: OBD test $50–$135 per vehicle; smoke opacity test $190–$200. Prices are set by each tester. ## Frequently asked questions ### How many Clean Truck Check testers are in Pioneer? CTC Finder lists 4 testing businesses in Pioneer from CARB's public tester list (4 credentialed testers), last checked November 1, 2026. Listing on CARB's list is optional, so the real number can be higher. ### Is there mobile Clean Truck Check testing in Pioneer? Yes. 4 listed businesses in Pioneer offer mobile testing, which means the tester comes to your yard. Use the Mobile filter above to see them. ### How much does a Clean Truck Check test cost in Pioneer? Testers set their own prices. Published prices for an OBD test are usually $50–$135 per vehicle; smoke opacity tests for older trucks often cost more, and mobile testers may add a trip fee. See the [cost guide](https://ctcfinder.com/guide/cost/). ### How often does my truck need a Clean Truck Check test? 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/). ## Nearby cities - [Jackson](https://ctcfinder.com/testers/amador-county/jackson/) — 3 listings, 27 mi - [Placerville](https://ctcfinder.com/testers/el-dorado-county/placerville/) — 3 listings, 28 mi - [Shingle Springs](https://ctcfinder.com/testers/el-dorado-county/shingle-springs/) — 3 listings, 34 mi - [Angels Camp](https://ctcfinder.com/testers/calaveras-county/angels-camp/) — 3 listings, 37 mi - [Valley Springs](https://ctcfinder.com/testers/calaveras-county/valley-springs/) — 3 listings, 38 mi - [Sonora](https://ctcfinder.com/testers/tuolumne-county/sonora/) — 5 listings, 38 mi