---
title: "Top Smog — Clean Truck Check, Fontana, CA | CTC Finder"
description: "Top Smog in Fontana, CA is on CARB's Clean Truck Check tester list. Offers OBD testing, motorhome testing. Phone, address and nearby testers."
url: "https://ctcfinder.com/tester/top-smog-fontana/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Top Smog

Clean Truck Check tester in Fontana, CA (San Bernardino 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 | 10591 Cherry Ave, Fontana, CA 92337 |
| County | San Bernardino County |
| Phone | (909) 224-2037 |
| Mobile testing | No |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Top Smog 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 Waraich logistics in Fontana, about 1 mile away. [See listing](https://ctcfinder.com/tester/waraich-logistics-fontana/).

If you need a tester at your yard, the nearest listed tester that offers mobile testing is GV Trans INC in Fontana, about 1 mile away. [See listing](https://ctcfinder.com/tester/gv-trans-inc-fontana/).

## Clean Truck Check testers in San Bernardino County

Top Smog is one of 277 testing businesses in San Bernardino County on CARB's public tester list. 243 of them offer mobile testing and 98 do smoke opacity tests. In Fontana itself there are 49 listed businesses, 37 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 Top Smog offer mobile Clean Truck Check testing?

Not according to CARB's tester list; plan to bring the truck to the tester. The nearest listed mobile tester is [GV Trans INC](https://ctcfinder.com/tester/gv-trans-inc-fontana/) (about 1 mile).

### Can Top Smog test a 2012 or older diesel truck?

Top Smog does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Waraich logistics](https://ctcfinder.com/tester/waraich-logistics-fontana/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Top Smog charge for a Clean Truck Check?

Top Smog has not published prices with us; call (909) 224-2037 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 Top Smog a CARB-credentialed tester?

Top Smog 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

- **[GV Trans INC](https://ctcfinder.com/tester/gv-trans-inc-fontana/)** — 14040 Slover Ave, Fontana, CA 92337 — (909) 746-3631 — 1 mi. Services: mobile testing, OBD testing.
- **[Master's Transportation Inc. Alan Thomas](https://ctcfinder.com/tester/masters-transportation-inc-alan-thomas-fontana/)** — 11001 Beech Ave, Fontana, CA 92337 — (951) 403-0829 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Moses Alryan](https://ctcfinder.com/tester/moses-alryan-fontana/)** — Fontana, CA 92337 — (562) 392-2599 — 1 mi. Services: mobile testing, OBD testing.
- **[Ryan Leininger](https://ctcfinder.com/tester/ryan-leininger-fontana/)** — Fontana, CA 92337 — (951) 840-5750 — 1 mi. Services: OBD testing.
- **[Shardae Anderson-Bell](https://ctcfinder.com/tester/shardae-anderson-bell-fontana/)** — Fontana, CA 92337 — (330) 605-6613 — 1 mi. Services: OBD testing.
- **[Sonu Monga](https://ctcfinder.com/tester/sonu-monga-fontana/)** — Fontana, CA 92337 — (909) 550-7000 — 1 mi. Services: mobile testing, OBD testing.