CARB Smog Check Diesel: Mobile Services for Fleet Compliance

Stop losing billable hours hauling heavy-duty trucks to repair shops or waiting in line at testing stations. We bring the official California Air Resources Board (CARB) Clean Truck Check testing directly to your truck yard, fleet depot, or job site across Greater Los Angeles.

Call Our Fleet Desk Directly: (213) 334-5626

2026 Commercial Fleet Compliance At-a-Glance:

Applies To: All diesel and alternative-fuel commercial vehicles with a Gross Vehicle Weight Rating (GVWR) over 14,000 lbs operating on California highways (including out-of-state fleets).

Mandatory Testing Schedule: Semi-Annual (2x per year) compliance testing tied to your California DMV registration date (or VIN last digit for out-of-state vehicles).

Early Testing Window: Tests can be submitted up to 90 days prior to your compliance deadline.

On-Site Capacity: Our mobile diesel testing service can accommodate 10 to 40+ trucks per visit with zero driver intervention required.

The 2026 CARB Regulatory Reality for Commercial Fleets

Warning for Fleet Operators: CARB's Heavy-Duty Inspection and Maintenance (HD I/M) regulation is now fully enforced. Failure to submit passing OBD or opacity test results into the state's CTC-VIS database results in automatic DMV registration holds, port/railyard access bans, and fines exceeding $1,000 per day per vehicle.

Why Southern California Fleet Managers Choose Mobile Testing

Managing semi-annual testing for 5, 20, or 50+ trucks individually presents an administrative nightmare. Sending drivers to off-site testing facilities consumes fuel, wastes labor hours, and takes revenue-generating assets off the road.

We Test While Your Trucks Are Parked: Schedule mobile diesel testing during planned yard downtime, weekends, or shift changes (between loads or early morning).

Instant CTC-VIS Portal Synchronization: As CARB-credentialed testers, we upload passing OBD diagnostic data and smoke opacity test results to the state system directly from our mobile rigs on-site.

Bulk Fleet & B2B Volume Pricing: Benefit from tiered pricing designed for commercial fleets, drayage operators, and logistics hubs.

Proactive Deadline Tracking: We monitor your entire fleet's semi-annual compliance renewal dates so you never face a surprise DMV hold.

How Our Mobile Fleet Testing Process Works

Send Us Your Fleet Roster: In just 5 minutes, provide your vehicle list (VINs, engine years, and yard locations). We audit your compliance dates in the CARB CTC-VIS database and create a customized, zero-downtime testing schedule.

On-Site Yard Testing Visit: Our CARB-credentialed mobile technician arrives at your facility equipped with official diagnostic scanners and opacity meters. For 2013+ engines, we run electronic OBD scans; for 2012 and older engines, we perform visual and smoke opacity tests.

Immediate CTC-VIS Data Upload: Enjoy real-time compliance logging. Test results are transmitted directly to the state's CTC-VIS system from the field. You receive instant digital certificates for every passing vehicle in your fleet.

Pre-Diagnostic Fault Clearance: Prevent compliance failures. If a vehicle triggers a pending emissions fault code, we provide the exact diagnostic trouble codes (DTCs) immediately so your shop mechanics can address the repair within your 90-day window before re-testing.

Commercial Vehicles We Service (GVWR Over 14,000 lbs)

Commercial Vehicle Category: Common Fleet Examples, Required Testing Method

Class 7 & 8 Heavy Duty: Port Drayage, Semi-Tractors, Dump Trucks, Ag Transports - 2013+: OBD Electronic Scan, 2012 & Older: Opacity / OVI Test

Class 4–6 Medium Duty: Box Trucks, Delivery Vans, Stake Beds, Tow Trucks - 2013+: OBD Electronic Scan, 2012 & Older: Opacity / OVI Test

Specialized & Municipal: Utility Vehicles, Waste Haulers, Transit Buses, Shuttles - On-site diagnostic scan & visual inspection

Out-of-State Fleets: Long-haul interstate trucks operating in California - VIN-digit schedule OBD/Opacity verification.