---
title: "On Site CTC — Clean Truck Check, Manteca, CA | CTC Finder"
description: "On Site CTC in Manteca, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and nearby testers."
url: "https://ctcfinder.com/tester/on-site-ctc-manteca/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# On Site CTC

Clean Truck Check tester in Manteca, 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 | 343 Cowell Ave, Manteca, CA 95336 |
| County | San Joaquin County |
| Phone | (760) 698-0797 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks On Site CTC 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 Apex Mobile Truck & RV Check in Manteca, about 1 mile away. [See listing](https://ctcfinder.com/tester/apex-mobile-truck-and-rv-check-manteca/).

## Clean Truck Check testers in San Joaquin County

On Site CTC 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 Manteca itself there are 19 listed businesses, 17 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 On Site CTC offer mobile Clean Truck Check testing?

Yes. On Site CTC 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 On Site CTC test a 2012 or older diesel truck?

On Site CTC does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Apex Mobile Truck & RV Check](https://ctcfinder.com/tester/apex-mobile-truck-and-rv-check-manteca/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does On Site CTC charge for a Clean Truck Check?

On Site CTC has not published prices with us; call (760) 698-0797 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 On Site CTC a CARB-credentialed tester?

On Site CTC 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 Stagno](https://ctcfinder.com/tester/aaron-stagno-manteca/)** — Manteca, CA 95336 — (209) 595-6971 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Apex Mobile Truck & RV Check](https://ctcfinder.com/tester/apex-mobile-truck-and-rv-check-manteca/)** — 1230 Higton St, Manteca, CA 95336 — (925) 216-5330 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[ASR Truck Trailer Repair](https://ctcfinder.com/tester/asr-truck-trailer-repair-manteca/)** — 11151 Venture Way, Manteca, CA 95336 — (209) 905-4427 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Best Fleet Care INC](https://ctcfinder.com/tester/best-fleet-care-inc-manteca/)** — 578 Commerce Ct, Manteca, CA 95336 — (209) 414-1817 — 1 mi. Services: not listed.
- **[CARB Testing & Compliance](https://ctcfinder.com/tester/carb-testing-and-compliance-manteca/)** — 616 Birchwood St, Manteca, CA 95336 — (209) 880-9940 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[David F Beltran](https://ctcfinder.com/tester/david-f-beltran-manteca/)** — Manteca, CA 95336 — (510) 760-1204 — 1 mi. Services: mobile testing, OBD testing.