---
title: "Cornerstone Diesel Compliance — Clean Truck Check, Ventura, CA"
description: "Cornerstone Diesel Compliance in Ventura, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address…"
url: "https://ctcfinder.com/tester/cornerstone-diesel-compliance-ventura/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Cornerstone Diesel Compliance

Clean Truck Check tester in Ventura, CA (Ventura 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 | 1569 Raccoon Ct, Ventura, CA 93003 |
| County | Ventura County |
| Phone | (661) 932-6468 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Cornerstone Diesel Compliance 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 Abdullah Kwara in Ventura, about 1 mile away. [See listing](https://ctcfinder.com/tester/abdullah-kwara-ventura/).

## Clean Truck Check testers in Ventura County

Cornerstone Diesel Compliance is one of 68 testing businesses in Ventura County on CARB's public tester list. 61 of them offer mobile testing and 21 do smoke opacity tests. In Ventura itself there are 14 listed businesses, 14 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 Cornerstone Diesel Compliance offer mobile Clean Truck Check testing?

Yes. Cornerstone Diesel Compliance 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 Cornerstone Diesel Compliance test a 2012 or older diesel truck?

Cornerstone Diesel Compliance does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Abdullah Kwara](https://ctcfinder.com/tester/abdullah-kwara-ventura/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Cornerstone Diesel Compliance charge for a Clean Truck Check?

Cornerstone Diesel Compliance has not published prices with us; call (661) 932-6468 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 Cornerstone Diesel Compliance a CARB-credentialed tester?

Cornerstone Diesel Compliance 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

- **[Abdullah Kwara](https://ctcfinder.com/tester/abdullah-kwara-ventura/)** — Ventura, CA 93003 — (805) 823-3984 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[RAM Truck And Trailer Repair](https://ctcfinder.com/tester/ram-truck-and-trailer-repair-ventura/)** — 6952 Malta PL, Ventura, CA 93003 — (323) 420-9398 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[SAM Hill and Sons](https://ctcfinder.com/tester/sam-hill-and-sons-ventura/)** — 2627 Beene Rd, Ventura, CA 93003 — (805) 761-8998 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Macias Mobile Repair](https://ctcfinder.com/tester/macias-mobile-repair-ventura/)** — Ventura, CA 93004 — (760) 560-6523 — 3 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Michael Attema](https://ctcfinder.com/tester/michael-attema-ventura/)** — Ventura, CA 93004 — (805) 797-0570 — 3 mi. Services: mobile testing, OBD testing.
- **[MP Enterprises](https://ctcfinder.com/tester/mp-enterprises-ventura/)** — 9059 Neath St, Ventura, CA 93004 — (805) 797-4438 — 3 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.