---
title: "Cmax Commercial maintenance — Clean Truck Check, Ontario, CA"
description: "Cmax Commercial maintenance in Ontario, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing. Phone, address and nearby testers."
url: "https://ctcfinder.com/tester/cmax-commercial-maintenance-ontario/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Cmax Commercial maintenance

Clean Truck Check tester in Ontario, 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 | 316 N Corona Ave, Ontario, CA 91764 |
| County | San Bernardino County |
| Phone | (909) 926-1389 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | No |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Cmax Commercial maintenance 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 | Not listed |

For a 2012 or older diesel, the nearest listed tester with smoke opacity testing is Andrew Gallegos in Ontario, about 1 mile away. [See listing](https://ctcfinder.com/tester/andrew-gallegos-ontario/).

## Clean Truck Check testers in San Bernardino County

Cmax Commercial maintenance 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 Ontario itself there are 31 listed businesses, 30 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 Cmax Commercial maintenance offer mobile Clean Truck Check testing?

Yes. Cmax Commercial maintenance 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 Cmax Commercial maintenance test a 2012 or older diesel truck?

Cmax Commercial maintenance does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Andrew Gallegos](https://ctcfinder.com/tester/andrew-gallegos-ontario/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Cmax Commercial maintenance charge for a Clean Truck Check?

Cmax Commercial maintenance has not published prices with us; call (909) 926-1389 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 Cmax Commercial maintenance a CARB-credentialed tester?

Cmax Commercial maintenance 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

- **[Andrew Gallegos](https://ctcfinder.com/tester/andrew-gallegos-ontario/)** — Ontario, CA 91764 — (909) 919-4606 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Mobile 2u Fleet Service LLC](https://ctcfinder.com/tester/mobile-2u-fleet-service-llc-ontario/)** — 337 N Vineyard Ave, Ontario, CA 91764 — (209) 424-4921 — 1 mi. Services: mobile testing, OBD testing.
- **[Mobile Fleet Test](https://ctcfinder.com/tester/mobile-fleet-test-ontario/)** — 1276 E Flora St, Ontario, CA 91764 — (909) 503-2811 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[MVPS Consultants](https://ctcfinder.com/tester/mvps-consultants-ontario/)** — Ontario, CA 91764 — (909) 781-0546 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[SoCal Clean Truck Check Llc](https://ctcfinder.com/tester/socal-clean-truck-check-llc-ontario/)** — 1312 N El Dorado Av, Ontario, CA 91764 — (951) 256-6933 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Center Lane Transportation, LLC](https://ctcfinder.com/tester/center-lane-transportation-llc-rancho-cucamonga/)** — Rancho Cucamonga, CA 91730 — (619) 598-6998 — 2 mi. Services: mobile testing, OBD testing, motorhome testing.