Diesel Diagnostics and After-Treatment Services in Southern California

Modern diesel engines depend on advanced electronic controls and emissions systems to operate efficiently and remain compliant. California Mobile Fleet provides professional diesel diagnostics and after-treatment services for semi-trucks, commercial fleets, and diesel powered vehicles throughout Southern California. Our mobile technicians bring manufacturer level diagnostic capabilities directly to your location, helping you identify issues accurately and reduce costly downtime.

Whether you’re dealing with warning lights, derates, poor performance, or emissions faults, accurate diagnostics are the first step toward a reliable fix.

Advanced Mobile Diesel Diagnostics

Today’s diesel engines generate detailed fault data that must be interpreted correctly. Guesswork leads to unnecessary parts replacement and repeat failures. California Mobile Fleet uses professional diagnostic tools and OEM-level software to analyze engine and system data on site.

Our mobile diesel diagnostics allow us to pinpoint electrical, sensor, control module, and performance issues without transporting the vehicle to a shop. This approach speeds up repairs and helps fleets make informed maintenance decisions.

Engine and Transmission Diagnostic Support

We provide diagnostic support for major diesel engine platforms commonly used in commercial operations, including Cummins, Detroit Diesel, Volvo, Mack, International, PACCAR, Hino and Isuzu. Our technicians are also equipped to diagnose and repair Allison and Eaton transmissions.

By accurately identifying faults within engines, transmissions, and related control systems, we help restore proper operation while preventing unnecessary component replacements

After-Treatment System Diagnostics and Repair

After-treatment systems are essential for emissions compliance but are also a frequent source of breakdowns. Issues within DPF, DEP, and SCR systems can trigger warning lights, derates, and engine shutdowns if not addressed promptly.

California Mobile Fleet provides mobile diagnostics and repair support for after treatment systems helping identify the cause of emissions faults and determine the appropriate corrective action. Early intervention helps prevent escalation into more costly repairs or compliance issues.

Emissions Compliance and Clean Truck Check Readiness

Diesel diagnostics and after-treatment service play a critical role in maintaining compliance with California emissions regulations. Our services support CARB Clean Truck Check readiness by ensuring emissions systems are operating correctly and fault codes are addressed before inspections are due.

Integrating diagnostics into routine maintenance and fleet diesel repair programs helps reduce the risk of failed inspections, fines, and out of service orders.

Reducing Downtime with Accurate Diagnostics

Accurate diagnostics shorten repair times and improve reliability. By identifying the root cause of issues quickly, our technicians help fleets avoid repeat breakdowns and extended downtime.

When mobile repairs can be completed on site, we focus on restoring safe operations as efficiently as possible. If additional service is required, we coordinate next steps to minimize disruption.

Mobile Service for Fleets and Owner-Operators

California Mobile Fleet provides diesel diagnostics and after-treatment services for fleets and independent owner-operators alike. Fleet managers benefit from clear diagnostic reporting and actionable recommendations, while owner-operators receive straightforward service focused on keeping their vehicles compliant and road ready.

Our mobile diesel repair service model delivers consistent quality without the delays associated with traditional repair facilities.

Why Choose California Mobile Fleet for Your Diesel Diagnostics and After-Treatment Services?

Accurate diagnostics are essential for reliable diesel operation and emissions compliance. We combine technical expertise with mobile convenience, delivering dependable diagnostic support where it’s needed most.

Our focus on accuracy, compliance, and efficiency helps fleets and owner-operators reduce downtime and maintain confidence in their equipment.

Schedule Diesel Diagnostics or After-Treatment Service Today!

If your truck or fleet is experiencing warning lights, derates, or emissions related issues, California Mobile Fleet is ready to help. Our diesel diagnostics and after-treatment services are available throughout Southern California.

Contact us today to schedule your service or discuss diagnostic support for your diesel truck!