GTC Services, LLC

Clean Truck Check tester in Converse, TX.

GTC Services, LLC appears on CARB's public list of credentialed Clean Truck Check testers with 3 credentialed testers at this business. It lists mobile testing, OBD testing. Mobile testing means the tester can come to your yard or job site.

Location
12930 Interstate 10 E, Converse, TX 78109
Phone
(210) 648-0316
Mobile testing
Yes — comes to your yard
OBD testing
Yes
Smoke opacity (non-OBD)
No
Motorhomes
No
Credentialed testers
3
Last verified

Call (210) 648-0316 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 GTC Services, LLC can test

The test CARB requires depends on the engine's fuel and model year. Based on the services GTC Services, LLC lists on CARB's tester list:

Your vehicleTest requiredThis tester
Diesel, model year 2013 or newerOBD scanYes
Alternative fuel (natural gas, propane), 2018 or newerOBD scanYes
Diesel, model year 2012 or older (no OBD)Smoke opacity test (SAE J1667) plus visual inspectionNot listed
California-registered motorhomeSame test as above by engine year, once a yearNot listed

For a 2012 or older diesel, the nearest listed tester with smoke opacity testing is WD Truck and Trailer Care in San Antonio, about 6 miles away. See listing.

Clean Truck Check testers in Texas

GTC Services, LLC is one of 46 testing businesses in Texas on CARB's public tester list. 37 of them offer mobile testing and 18 do smoke opacity tests. Testers outside California.

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 GTC Services, LLC 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 GTC Services, LLC offer mobile Clean Truck Check testing?

Yes. GTC Services, LLC 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 GTC Services, LLC test a 2012 or older diesel truck?

GTC Services, LLC does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is WD Truck and Trailer Care (about 6 miles). Trucks from 2013 on get an OBD scan instead.

How much does GTC Services, LLC charge for a Clean Truck Check?

GTC Services, LLC has not published prices with us; call (210) 648-0316 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 GTC Services, LLC a CARB-credentialed tester?

GTC Services, LLC appears on CARB's public Clean Truck Check tester list with 3 credentialed testers, 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 Converse

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.

Call (210) 648-0316