---
title: "JB Mobile Service — Clean Truck Check, Napa, CA | CTC Finder"
description: "JB Mobile Service in Napa, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing. Phone, address…"
url: "https://ctcfinder.com/tester/jb-mobile-service-napa/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# JB Mobile Service

Clean Truck Check tester in Napa, CA (Napa 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 | 787 Airpark Rd, Napa, CA 94558 |
| County | Napa County |
| Phone | (707) 206-5358 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | No |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks JB Mobile Service 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 | Not listed |

## Clean Truck Check testers in Napa County

JB Mobile Service is one of 11 testing businesses in Napa County on CARB's public tester list. 11 of them offer mobile testing and 6 do smoke opacity tests. In Napa itself there are 11 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 JB Mobile Service offer mobile Clean Truck Check testing?

Yes. JB Mobile Service 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 JB Mobile Service test a 2012 or older diesel truck?

Yes. JB Mobile Service 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 JB Mobile Service charge for a Clean Truck Check?

JB Mobile Service has not published prices with us; call (707) 206-5358 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 JB Mobile Service a CARB-credentialed tester?

JB Mobile Service 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

- **[Hector Kreitz](https://ctcfinder.com/tester/hector-kreitz-napa/)** — Napa, CA 94558 — (707) 704-9863 — 1 mi. Services: mobile testing, OBD testing.
- **[Napa Valley RV and Truck](https://ctcfinder.com/tester/napa-valley-rv-and-truck-napa/)** — 26 Big Leaf Ct, Napa, CA 94558 — (707) 850-6624 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Napa Valley Unified School District](https://ctcfinder.com/tester/napa-valley-unified-school-district-napa/)** — 1340 Menlo Ave, Napa, CA 94558 — (707) 492-0366 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[All Sacramento/Bay Area](https://ctcfinder.com/tester/all-sacramento-bay-area-vacaville/)** — Vacaville, CA 95688 — (916) 243-5089 — 9 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Brian Tierney](https://ctcfinder.com/tester/brian-tierney-vacaville/)** — Vacaville, CA 95688 — (707) 363-4083 — 9 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Buckners Truck Check](https://ctcfinder.com/tester/buckners-truck-check-vacaville/)** — 137 Suncrest Way, Vacaville, CA 95688 — (707) 828-4016 — 9 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.