JM Diesel Repairs
Clean Truck Check tester in Sylmar, CA (Los Angeles County).
- Mobile testing
- OBD test
- Motorhomes
JM Diesel Repairs appears on CARB's public list of credentialed Clean Truck Check testers. It lists mobile testing, OBD testing, motorhome testing. Mobile testing means the tester can come to your yard or job site.
- Location
- 14645 Polk St, Sylmar, CA 91342
- County
- Los Angeles County
- Phone
- (909) 438-4353
- Mobile testing
- Yes — comes to your yard
- OBD testing
- Yes
- Smoke opacity (non-OBD)
- No
- Motorhomes
- Yes
- Credentialed testers
- 1
- Last verified
Call (909) 438-4353 Open in Google Maps
Before you call
- Have your VIN, odometer reading and plate number ready.
- Your vehicle must be registered in CTC-VIS and the annual compliance fee paid; the tester submits the result to CARB.
- Ask for the price per vehicle and any mobile trip fee. Typical published prices for an OBD test are $50–$135 per vehicle (see cost guide).
Which trucks JM Diesel Repairs can test
The test CARB requires depends on the engine's fuel and model year. Based on the services JM Diesel Repairs lists on CARB's tester list:
| 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.
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. All testers in Los Angeles County.
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. You can test up to 90 days before a deadline. Get a free email reminder before each one.
How to check a tester's credential
CARB publishes its Clean Truck Check tester list, where JM Diesel Repairs appears as of November 1, 2026. Listing there is optional, so a missing name does not always mean a tester is not credentialed. After the test, check that the passing result shows for your vehicle in CTC-VIS; that is what counts for compliance.
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 (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.
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 near Sylmar
-
ALI Trucking Services
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Clean Truck Check by JS
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Engine Compliance
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Reyes Truck Repair
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Unibilt Collision Center
- Mobile testing
- OBD test
- Motorhomes
-
Champion DPF
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
Source: CARB's public Clean Truck Check tester list, last checked . Listing on CARB's list is optional for testers, so some credentialed testers are not shown. Services, hours and prices change; please confirm with the tester before you go. Something wrong? Send a correction.