---
title: "John Thorpe — Clean Truck Check, Colton, CA | CTC Finder"
description: "John Thorpe in Colton, CA is on CARB's Clean Truck Check tester list. Offers OBD testing, smoke opacity (non-OBD) testing, motorhome testing. Phone, address…"
url: "https://ctcfinder.com/tester/john-thorpe-colton/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# John Thorpe

Clean Truck Check tester in Colton, 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 | Colton, CA 92324 |
| County | San Bernardino County |
| Phone | (209) 298-3552 |
| Mobile testing | No |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks John Thorpe 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 |

If you need a tester at your yard, the nearest listed tester that offers mobile testing is Aaron Gutierrez in Colton, about 1 mile away. [See listing](https://ctcfinder.com/tester/aaron-gutierrez-colton/).

## Clean Truck Check testers in San Bernardino County

John Thorpe 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 Colton itself there are 15 listed businesses, 13 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 John Thorpe 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 [Aaron Gutierrez](https://ctcfinder.com/tester/aaron-gutierrez-colton/) (about 1 mile).

### Can John Thorpe test a 2012 or older diesel truck?

Yes. John Thorpe 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 John Thorpe charge for a Clean Truck Check?

John Thorpe has not published prices with us; call (209) 298-3552 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 John Thorpe a CARB-credentialed tester?

John Thorpe 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

- **[Aaron Gutierrez](https://ctcfinder.com/tester/aaron-gutierrez-colton/)** — Colton, CA 92324 — (951) 241-5693 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing.
- **[Alan Hernandez](https://ctcfinder.com/tester/alan-hernandez-colton/)** — Colton, CA 92324 — (323) 841-4518 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[CDS](https://ctcfinder.com/tester/cds-colton/)** — 310 Rexford St, Colton, CA 92324 — (805) 833-1604 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Chris Lanning](https://ctcfinder.com/tester/chris-lanning-colton/)** — Colton, CA 92324 — (714) 719-7127 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Clean Diesel Specialist - Coton](https://ctcfinder.com/tester/clean-diesel-specialist-coton-colton/)** — 310 Rexford St, Colton, CA 92324 — (909) 430-0018 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Connie Silvia](https://ctcfinder.com/tester/connie-silvia-colton/)** — Colton, CA 92324 — (909) 206-9046 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.