24/7 Semi Truck Repair & Diagnostics
California Semi Truck Smog & CARB Clean Truck Check Testing
California's Clean Truck Check program generally applies to heavy-duty vehicles over 14,000 lbs GVWR that operate on California roads, and most covered vehicles need emissions testing twice a year. Missing it can mean DMV registration holds and penalties.
100+
Yrs Combined Experience
24/7/365
Dispatch
99%
Back on the Road Without a Tow
100 mi
Radius per Location
We Bring the Shop to Your Semi
Smog and CARB testing is available in California only. Our lead technician is CARB certified, and when a truck doesn't pass, we diagnose and repair the emissions system instead of just handing you a failed result.
Diagnostics included: A failed emissions test is a diagnostic problem. We read the aftertreatment data, find the failed component and repair it.
California Semi Truck Emissions Services
For owner-operators and fleets running in California:
Clean Truck Check Testing
Emissions testing for heavy-duty trucks under California's Clean Truck Check (HD I/M) program.
Emissions Diagnostics
Aftertreatment data and fault codes reviewed to find what's failing.
Emissions System Repair
DPF, DEF, SCR, EGR and sensor repairs to get back into compliance.
Avoid Registration Holds
Keep your California registration clear and your trucks working.
Why Clean Truck Check Compliance Matters
DMV Registration Holds
California can block registration renewal for non-compliant trucks.
Penalties
Operating without a passing test can lead to citations and enforcement actions.
Freight Delays
A truck you can't register is a truck you can't run.
Customer Reviews
What Drivers & Fleets Say
“We use Rapid Truck Repair regularly for road calls, and I honestly don't know what we'd do without them sometimes. They've saved us more headaches than I can count and have proven time and time again that they're people we can count on. They do great work, they're honest, and they genuinely care about taking care of their customers. A huge shoutout to Macie! She's always incredibly helpful, easy to communicate with, and willing to go the extra mile.”
“I've been in the trucking industry for many years, and this is by far the best truck service I've ever received. They were quick to respond and handled everything efficiently. On top of that, their pricing was extremely reasonable which is a huge relief when you're in a bind. I'm definitely sticking with them for any future truck service needs. Highly recommend!”
“I've had Rapid Truck Repair help me out a couple of times during the night with our semi-trucks, and they've always been on time. We broke down in Weed, CA and they went out of their way next day to make sure we had the right parts to get our truck fixed, which was super important for keeping our deliveries on schedule. Really appreciate their quick and reliable service.”
“My EGR pipe completely cracked off on my T680 with an X15 engine. I was in Yreka, California, and it was the weekend. They came out, removed my parts, went to the Kenworth dealer, picked up all the original hoses and clamps, completed the repairs, and got me home. Can't thank them enough!”
Smog & CARB Testing (CA) Service Areas
Available 24/7 from our service hubs and the communities around them:
FAQ
Smog & CARB Testing (CA) FAQs
Do I need a CARB Clean Truck Check, and how often?
It generally applies to heavy-duty vehicles over 14,000 lbs GVWR operating on California public roads. Most covered vehicles need testing twice a year, though exemptions may apply. Check CARB's current rules or call us.
Do you offer smog testing outside California?
No. Smog and CARB testing is a California program and is only available at our California locations.
What if my semi fails its smog test?
We diagnose the emissions system — DPF, DEF, SCR, EGR and sensors — and make the repair needed to pass.
More Semi Truck Services
Mobile Semi Truck Repair
Roadside and on-site semi truck and trailer repair with full diagnostics — we bring the repair to your rig, day or night.
Learn moreTire Repair & Rim Replacement
Blowouts, flats and damaged rims replaced — steer, drive and trailer positions, roadside or at your yard.
Learn moreOnsite & Fleet Repair
We come to your yard or terminal to repair, maintain and inspect multiple trucks — with negotiated fleet rates.
Learn moreSemi Truck Diagnostics
Manufacturer-level diagnostics, derate and limp-mode repair and forced DPF regens — roadside or at your yard.
Learn moreHeavy Duty Semi Truck Repair
Engine, brake, cooling, electrical and suspension repairs plus preventive maintenance for Class 8 trucks and trailers.
Learn moreDOT & BIT Inspections
Annual DOT inspections at every location and California 90-day BIT inspections — at your yard, with sticker and report.
Learn moreSchedule a California Clean Truck Check
Don't wait until your registration is blocked.