Carroll's Automotive Repair
Clean Truck Check tester in Shandon, CA (San Luis Obispo County).
- Mobile testing
- OBD test
- Motorhomes
Carroll's Automotive Repair 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
- 280 S 1st St, Shandon, CA 93461
- County
- San Luis Obispo County
- Phone
- (805) 610-9586
- Mobile testing
- Yes — comes to your yard
- OBD testing
- Yes
- Smoke opacity (non-OBD)
- No
- Motorhomes
- Yes
- Credentialed testers
- 1
- Last verified
Call (805) 610-9586 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 Carroll's Automotive Repair can test
The test CARB requires depends on the engine's fuel and model year. Based on the services Carroll's Automotive Repair 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 Dye's Mobile Diesel Smoke Testing in Paso Robles, about 25 miles away. See listing.
Clean Truck Check testers in San Luis Obispo County
Carroll's Automotive Repair is one of 25 testing businesses in San Luis Obispo County on CARB's public tester list. 22 of them offer mobile testing and 9 do smoke opacity tests. All testers in San Luis Obispo 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 Carroll's Automotive Repair 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 Carroll's Automotive Repair offer mobile Clean Truck Check testing?
Yes. Carroll's Automotive Repair 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 Carroll's Automotive Repair test a 2012 or older diesel truck?
Carroll's Automotive Repair does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is Dye's Mobile Diesel Smoke Testing (about 25 miles). Trucks from 2013 on get an OBD scan instead.
How much does Carroll's Automotive Repair charge for a Clean Truck Check?
Carroll's Automotive Repair has not published prices with us; call (805) 610-9586 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 Carroll's Automotive Repair a CARB-credentialed tester?
Carroll's Automotive Repair 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.
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.