---
title: "JM Transportation LLC — Clean Truck Check, Modesto, CA"
description: "JM Transportation LLC in Modesto, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and…"
url: "https://ctcfinder.com/tester/jm-transportation-llc-modesto/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# JM Transportation LLC

Clean Truck Check tester in Modesto, CA (Stanislaus 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 | 3305 Copeland Ct, Modesto, CA 95355 |
| County | Stanislaus County |
| Phone | (408) 512-7925 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks JM Transportation LLC 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 A&B Truck repair, Inc. in Modesto, about 1 mile away. [See listing](https://ctcfinder.com/tester/a-and-b-truck-repair-inc-modesto/).

## Clean Truck Check testers in Stanislaus County

JM Transportation LLC is one of 53 testing businesses in Stanislaus County on CARB's public tester list. 47 of them offer mobile testing and 22 do smoke opacity tests. In Modesto itself there are 23 listed businesses, 21 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 JM Transportation LLC offer mobile Clean Truck Check testing?

Yes. JM Transportation LLC 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 JM Transportation LLC test a 2012 or older diesel truck?

JM Transportation LLC does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [A&B Truck repair, Inc.](https://ctcfinder.com/tester/a-and-b-truck-repair-inc-modesto/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does JM Transportation LLC charge for a Clean Truck Check?

JM Transportation LLC has not published prices with us; call (408) 512-7925 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 JM Transportation LLC a CARB-credentialed tester?

JM Transportation LLC 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

- **[A&B Truck repair, Inc.](https://ctcfinder.com/tester/a-and-b-truck-repair-inc-modesto/)** — 959 S 9th St, Modesto, CA 95355 — (209) 527-6971 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[CleanTruck209](https://ctcfinder.com/tester/cleantruck209-modesto/)** — 2708 Deerfield Pl, Modesto, CA 95355 — (209) 556-2254 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Smog & DMV](https://ctcfinder.com/tester/smog-and-dmv-modesto/)** — 1616 Oakdale Rd Suite 1, Modesto, CA 95355 — (209) 735-1241 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Nathan Simpson](https://ctcfinder.com/tester/nathan-simpson-modesto/)** — Modesto, CA 95354 — (209) 678-8549 — 3 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing.
- **[S S DPF Filter Cleaning](https://ctcfinder.com/tester/s-s-dpf-filter-cleaning-modesto/)** — 220 Beard Ave, Modesto, CA 95354 — (209) 649-4581 — 3 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[S&S dpf filter cleaning](https://ctcfinder.com/tester/s-and-s-dpf-filter-cleaning-modesto/)** — 220 Beard Ave, Modesto, CA 95354 — (209) 622-6134 — 3 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.