Our Mission
At DWCC DWCC LLC provides CARB Clean Truck Check–compliant mobile emissions testing for diesel vehicles over 14,000 pounds, supporting fleet operators with accurate OBD, visual, and opacity testing performed on-site. With over 16 years of hands-on diesel truck experience, we understand real-world engine systems, fault codes, and compliance requirements—allowing us to deliver efficient testing, reliable documentation, and reduced vehicle downtime across California fleets.
About DWCC LLC
About DWCC LLC
About DWCC LLC
DWCC LLC is a California-based mobile diesel emissions testing company specializing in Clean Truck Check compliance for heavy-duty diesel vehicles over 14,000 pounds. We help fleet owners, operators, and businesses stay compliant with California emissions regulations through accurate, on-site testing designed to minimize downtime and disruption.
With over 16 years of hands-on diesel truck experience, our team understands diesel systems beyond the test itself—from real-world engine operation to compliance requirements. This technical background allows us to perform efficient testing, identify issues quickly, and provide reliable documentation fleets can trust.
Our mission is simple: make Clean Truck Check compliance straightforward, dependable, and efficient—without taking trucks off the road longer than necessary.
Service Areas
DWCC LLC provides mobile emissions testing throughout Southern California, including:
- Orange County
- Los Angeles County
- San Diego County
Mobile service allows us to test vehicles directly at your yard, job site, or facility. Travel fees apply per visit based on location.
If you operate outside these areas, contact us to discuss availability.
Scheduling & Appointments
Scheduling with DWCC LLC is designed to be simple and transparent.
- Appointments are scheduled in advance to reserve your service window
- A deposit is required to secure your scheduled visit and is applied toward the final service total
- Arrival times are provided as an arrival window to account for traffic and site access
- The remaining balance is due at the time of service
Fleet, multi-vehicle, and repeat service scheduling is available upon request.
To schedule service or request a quote, contact us directly or use our online booking option.
Client success stories
Contact Us
Call or email now to Schedule
Darren@DWCCLLC.com & (503) 932-8657
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