---
title: "Harps Mobile Servcies — Clean Truck Check, Stockton, CA"
description: "Harps Mobile Servcies in Stockton, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and…"
url: "https://ctcfinder.com/tester/harps-mobile-servcies-stockton/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Harps Mobile Servcies

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 | 3412 E Miner Ave, Stockton, CA 95205 |
| County | San Joaquin County |
| Phone | (209) 423-4632 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Harps Mobile Servcies 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 Brannon Tire in Stockton, about 1 mile away. [See listing](https://ctcfinder.com/tester/brannon-tire-stockton/).

## Clean Truck Check testers in San Joaquin County

Harps Mobile Servcies 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 Harps Mobile Servcies offer mobile Clean Truck Check testing?

Yes. Harps Mobile Servcies 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 Harps Mobile Servcies test a 2012 or older diesel truck?

Harps Mobile Servcies does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Brannon Tire](https://ctcfinder.com/tester/brannon-tire-stockton/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Harps Mobile Servcies charge for a Clean Truck Check?

Harps Mobile Servcies has not published prices with us; call (209) 423-4632 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 Harps Mobile Servcies a CARB-credentialed tester?

Harps Mobile Servcies 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

- **[A&A Tow Services Inc](https://ctcfinder.com/tester/a-and-a-tow-services-inc-stockton/)** — 1011 N Broadway Ave, Ste AA, Stockton, CA 95205 — (209) 339-2331 — 1 mi. Services: mobile testing, OBD testing.
- **[Brannon Tire](https://ctcfinder.com/tester/brannon-tire-stockton/)** — 3730 N Wilson Way, Stockton, CA 95205 — (209) 570-9306 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[California's Diesel Mobile Testing LLC.](https://ctcfinder.com/tester/californias-diesel-mobile-testing-llc-stockton/)** — 2245 Learned Ave, Stockton, CA 95205 — (209) 649-1083 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Convenient Truck and Trailer Repair](https://ctcfinder.com/tester/convenient-truck-and-trailer-repair-stockton/)** — 1684 E Alpine Ave, Stockton, CA 95205 — (209) 715-9053 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Diesel Performance INC](https://ctcfinder.com/tester/diesel-performance-inc-stockton/)** — 2804 E Fremont St, Stockton, CA 95205 — (209) 946-0233 — 1 mi. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Fateh Truck Repair](https://ctcfinder.com/tester/fateh-truck-repair-stockton/)** — 2915 Munford Ave, Stockton, CA 95205 — (916) 839-8888 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.