---
title: "JM Diesel Repairs — Clean Truck Check, Sylmar, CA"
description: "JM Diesel Repairs in Sylmar, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and nearby…"
url: "https://ctcfinder.com/tester/jm-diesel-repairs-sylmar/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# JM Diesel Repairs

Clean Truck Check tester in Sylmar, CA (Los Angeles 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 | 14645 Polk St, Sylmar, CA 91342 |
| County | Los Angeles County |
| Phone | (909) 438-4353 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks JM Diesel Repairs 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 ALI Trucking Services in Sylmar, about 1 mile away. [See listing](https://ctcfinder.com/tester/ali-trucking-services-sylmar/).

## Clean Truck Check testers in Los Angeles County

JM Diesel Repairs is one of 516 testing businesses in Los Angeles County on CARB's public tester list. 465 of them offer mobile testing and 190 do smoke opacity tests. In Sylmar itself there are 6 listed businesses, 6 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 JM Diesel Repairs offer mobile Clean Truck Check testing?

Yes. JM Diesel Repairs 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 JM Diesel Repairs test a 2012 or older diesel truck?

JM Diesel Repairs does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [ALI Trucking Services](https://ctcfinder.com/tester/ali-trucking-services-sylmar/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does JM Diesel Repairs charge for a Clean Truck Check?

JM Diesel Repairs has not published prices with us; call (909) 438-4353 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 JM Diesel Repairs a CARB-credentialed tester?

JM Diesel Repairs 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

- **[ALI Trucking Services](https://ctcfinder.com/tester/ali-trucking-services-sylmar/)** — 15036 Florentine St, Sylmar, CA 91342 — (818) 585-4959 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Clean Truck Check by JS](https://ctcfinder.com/tester/clean-truck-check-by-js-sylmar/)** — 13608 Little Tujunga Canyon Rd, Sylmar, CA 91342 — (818) 259-9920 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Engine Compliance](https://ctcfinder.com/tester/engine-compliance-sylmar/)** — 13553 Polk St, Sylmar, CA 91342 — (818) 400-3646 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Reyes Truck Repair](https://ctcfinder.com/tester/reyes-truck-repair-sylmar/)** — 11360 Ruggiero Ave, Sylmar, CA 91342 — (818) 923-7285 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Unibilt Collision Center](https://ctcfinder.com/tester/unibilt-collision-center-sylmar/)** — 12051 Lopez Canyon Rd, Sylmar, CA 91342 — (818) 730-1770 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Champion DPF](https://ctcfinder.com/tester/champion-dpf-san-fernando/)** — San Fernando, CA 91340 — (661) 480-6299 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.