---
title: "Mad Dog — Clean Truck Check, Stockton, CA | CTC Finder"
description: "Mad Dog in Stockton, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing…"
url: "https://ctcfinder.com/tester/mad-dog-stockton/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Mad Dog

Clean Truck Check tester in Stockton, CA (San Joaquin 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 | Stockton, CA 95212 |
| County | San Joaquin County |
| Phone | (559) 806-4244 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Mad Dog 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 | Yes |

## Clean Truck Check testers in San Joaquin County

Mad Dog is one of 124 testing businesses in San Joaquin County on CARB's public tester list. 111 of them offer mobile testing and 53 do smoke opacity tests. In Stockton itself there are 50 listed businesses, 43 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 Mad Dog offer mobile Clean Truck Check testing?

Yes. Mad Dog 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 Mad Dog test a 2012 or older diesel truck?

Yes. Mad Dog 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 Mad Dog charge for a Clean Truck Check?

Mad Dog has not published prices with us; call (559) 806-4244 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 Mad Dog a CARB-credentialed tester?

Mad Dog 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

- **[Clean Truck Test Near Me](https://ctcfinder.com/tester/clean-truck-test-near-me-stockton/)** — 4255 E Morada Ln, Stockton, CA 95212 — (209) 687-3383 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Five Rivers Smog (Clean Truck Check)](https://ctcfinder.com/tester/five-rivers-smog-clean-truck-check-stockton/)** — 3739 Silvana Ln, Stockton, CA 95212 — (209) 407-7417 — 1 mi. Services: mobile testing, OBD testing.
- **[Mohammad Waseem](https://ctcfinder.com/tester/mohammad-waseem-stockton/)** — Stockton, CA 95212 — (209) 712-3087 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Prabhnoor Brar](https://ctcfinder.com/tester/prabhnoor-brar-stockton/)** — Stockton, CA 95212 — (209) 981-1946 — 1 mi. Services: OBD testing.
- **[Julian Flores](https://ctcfinder.com/tester/julian-flores-stockton/)** — Stockton, CA 95210 — (209) 910-8422 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Khizar rehman](https://ctcfinder.com/tester/khizar-rehman-stockton/)** — Stockton, CA 95210 — (571) 474-8660 — 4 mi. Services: mobile testing, OBD testing, motorhome testing.