---
title: "GDM Services — Clean Truck Check, Santa Maria, CA"
description: "GDM Services in Santa Maria, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome…"
url: "https://ctcfinder.com/tester/gdm-services-santa-maria/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# GDM Services

Clean Truck Check tester in Santa Maria, CA (Santa Barbara 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 | 1322 Arabian Trl, Santa Maria, CA 93455 |
| County | Santa Barbara County |
| Phone | (805) 699-8232 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks GDM Services 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 Santa Barbara County

GDM Services is one of 31 testing businesses in Santa Barbara County on CARB's public tester list. 30 of them offer mobile testing and 13 do smoke opacity tests. In Santa Maria itself there are 21 listed businesses, 20 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 GDM Services offer mobile Clean Truck Check testing?

Yes. GDM Services 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 GDM Services test a 2012 or older diesel truck?

Yes. GDM Services 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 GDM Services charge for a Clean Truck Check?

GDM Services has not published prices with us; call (805) 699-8232 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 GDM Services a CARB-credentialed tester?

GDM Services 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

- **[Travis Gomez](https://ctcfinder.com/tester/travis-gomez-orcutt/)** — Orcutt, CA 93455 — (831) 206-1643 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Cetti_Services Unlimited, Inc](https://ctcfinder.com/tester/cetti-services-unlimited-inc-santa-maria/)** — 1341 W McCoy Ln, Santa Maria, CA 93455 — (805) 207-8602 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Coast Diesel Service](https://ctcfinder.com/tester/coast-diesel-service-santa-maria/)** — 1104 Via Pavion, Santa Maria, CA 93455 — (805) 310-1182 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Deadline transit inspection](https://ctcfinder.com/tester/deadline-transit-inspection-santa-maria/)** — 522 Drake Dr, Santa Maria, CA 93455 — (805) 598-8228 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Diesel Injection Systems](https://ctcfinder.com/tester/diesel-injection-systems-santa-maria/)** — 1021 Tama Ln, Santa Maria, CA 93455 — (805) 680-5901 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Esteban Luna Solis](https://ctcfinder.com/tester/esteban-luna-solis-santa-maria/)** — Santa Maria, CA 93455 — (805) 868-9219 — 1 mi. Services: mobile testing, OBD testing.