--- title: "Clean Truck Check Testers in Union City, CA (6 listed)" description: "Find 6 CARB-credentialed Clean Truck Check testers in Union City, Alameda County: 5 offer mobile testing, 3 do smoke opacity tests. Phone numbers, services and…" url: "https://ctcfinder.com/testers/alameda-county/union-city/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in Union City, CA 6 testing businesses in Union City (Alameda County) are on CARB's public Clean Truck Check tester list (7 credentialed testers). 5 offer mobile testing, 3 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 Union City - **[Total Multi Services INC](https://ctcfinder.com/tester/total-multi-services-inc-union-city/)** — 1780 Whipple Rd Suite 110, Union City, CA 94587 — (510) 767-7165. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Bay Star Auto INC](https://ctcfinder.com/tester/bay-star-auto-inc-union-city/)** — 1275 Atlantic St, Union City, CA 94587 — (510) 489-3331. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Cuong Vuong](https://ctcfinder.com/tester/cuong-vuong-union-city/)** — Union City, CA 94587 — (951) 433-0641. Services: mobile testing, OBD testing. - **[Lally Truck &Tire Service INC](https://ctcfinder.com/tester/lally-truck-and-tire-service-inc-union-city/)** — 4600 Horner St, Union City, CA 94587 — (510) 557-1374. Services: mobile testing, OBD testing, motorhome testing. - **[Manjot Mashiana](https://ctcfinder.com/tester/manjot-mashiana-union-city/)** — Union City, CA 94587 — (510) 894-5468. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[SJ Diesel Smog Test](https://ctcfinder.com/tester/sj-diesel-smog-test-union-city/)** — 34625 Arroyo Dr, Union City, CA 94587 — (510) 314-9937. Services: mobile testing, OBD testing. ## More testers within 20 miles - **[Jaswinder Singh](https://ctcfinder.com/tester/jaswinder-singh-hayward/)** — Hayward, CA 94544 — (510) 579-7294 — 3 mi. Services: mobile testing, OBD testing, motorhome testing. - **[JR Trucking Services](https://ctcfinder.com/tester/jr-trucking-services-hayward/)** — 479 Custer Rd, Hayward, CA 94544 — (510) 589-2917 — 3 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing. - **[K1 Smog](https://ctcfinder.com/tester/k1-smog-hayward/)** — 24087 Mission Blvd, Hayward, CA 94544 — (510) 582-2500 — 3 mi. Services: OBD testing, motorhome testing. - **[Many Truck Repair](https://ctcfinder.com/tester/many-truck-repair-hayward/)** — 28425 E 11th St, Hayward, CA 94544 — (510) 925-7559 — 3 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Mobile Golden State Emissions Hayward](https://ctcfinder.com/tester/mobile-golden-state-emissions-hayward-hayward/)** — 50 Austin Ave., Hayward, CA 94544 — (925) 818-1831 — 3 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Norcal Fleet Service](https://ctcfinder.com/tester/norcal-fleet-service-hayward/)** — 29303 Pacific St, Hayward, CA 94544 — (415) 272-7877 — 3 mi. Services: mobile testing, OBD testing. - **[R S Transport](https://ctcfinder.com/tester/r-s-transport-hayward/)** — 28425 East 11th street, Hayward, CA 94544 — (510) 760-1487 — 3 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Bay Area Mobile Fleet Services](https://ctcfinder.com/tester/bay-area-mobile-fleet-services-hayward/)** — 2283 Dunn Rd, Hayward, CA 94545 — (510) 690-3878 — 4 mi. Services: mobile testing, OBD testing, motorhome testing. - **[DXA Diesel](https://ctcfinder.com/tester/dxa-diesel-hayward/)** — Hayward, CA 94545 — (341) 240-8560 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Emporium Auto Center](https://ctcfinder.com/tester/emporium-auto-center-hayward/)** — 2216 American Ave, Hayward, CA 94545 — (510) 822-1032 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing. - **[Imperial Truck Tire & Trailer Repair](https://ctcfinder.com/tester/imperial-truck-tire-and-trailer-repair-hayward/)** — 3138 Depot Rd, Hayward, CA 94545 — (510) 825-7820 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing. - **[Joel Resplandor](https://ctcfinder.com/tester/joel-resplandor-hayward/)** — Hayward, CA 94545 — (650) 534-5983 — 4 mi. Services: mobile testing, OBD testing. ## Trucking in Union City Alameda County includes the Port of Oakland and the I-880 industrial corridor (Hayward, San Leandro, Fremont). ## 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 Union City? CTC Finder lists 6 testing businesses in Union City from CARB's public tester list (7 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 Union City? Yes. 5 listed businesses in Union City 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 Union City? 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 - [Hayward](https://ctcfinder.com/testers/alameda-county/hayward/) — 18 listings, 3 mi - [Newark](https://ctcfinder.com/testers/alameda-county/newark/) — 4 listings, 6 mi - [Fremont](https://ctcfinder.com/testers/alameda-county/fremont/) — 12 listings, 7 mi - [San Lorenzo](https://ctcfinder.com/testers/alameda-county/san-lorenzo/) — 3 listings, 7 mi - [San Leandro](https://ctcfinder.com/testers/alameda-county/san-leandro/) — 8 listings, 9 mi - [Redwood City](https://ctcfinder.com/testers/san-mateo-county/redwood-city/) — 3 listings, 12 mi - [Dublin](https://ctcfinder.com/testers/alameda-county/dublin/) — 4 listings, 13 mi - [San Mateo](https://ctcfinder.com/testers/san-mateo-county/san-mateo/) — 4 listings, 13 mi - [Mountain View](https://ctcfinder.com/testers/santa-clara-county/mountain-view/) — 3 listings, 14 mi - [Santa Clara](https://ctcfinder.com/testers/santa-clara-county/santa-clara/) — 3 listings, 15 mi