Start with the truck.
Share the engine, year, fault codes, symptoms, and recent repair history.
CASCADIA SYSTEMS. SPECIALIST ATTENTION.
Aftertreatment, maintenance, and electrical diagnostics & repair for Detroit DD13 and DD15 engines. Plus California CARB Clean Truck Check OBD testing.

01 / OUR SPECIALTY
Our repair work centers on Cascadia trucks
with DD13 and DD15 engines.
Four services. A clear direction.
DPF. DEF. SCR. One focused approach.
Explore service ↗02 / DIAGNOSE & CAREKeep the system working. Keep the truck working.
Explore service ↗03 / DIAGNOSE & CARETrace the fault. Repair the cause.
Explore service ↗04 / TEST & COMPLYOBD testing. Repair support. A clearer next step.
Explore service ↗02 / CALIFORNIA CLEAN TRUCK CHECK
OBD testing and repair support in one place. We help you understand the issue and work toward meeting California CARB requirements.
Explore CARB testing ↗Schedule your OBD test
Testing by a credentialed tester for eligible vehicles.
Understand the result
Review a failed or not-ready result and the next steps.
Address the underlying issue
Diagnostic and repair support for emissions-related faults.
Testing and repair do not guarantee a passing result or complete compliance status.
03 / HOW WE WORK
Good repair starts with understanding
what the truck is telling you.
Share the engine, year, fault codes, symptoms, and recent repair history.
We investigate the relevant system and explain the findings and proposed work.
Address the identified issue, check the repair, and discuss maintenance or testing next steps.


A LOCAL TEAM. A SPECIFIC FOCUS.
RJ Truck & Trailer Repair serves owner-operators and fleets with a focused approach to DD13 and DD15 aftertreatment, maintenance, and electrical work.
Whether you’re chasing an intermittent fault, planning maintenance, or working through a Clean Truck Check concern, we start with your truck and your situation.
04 / SERVICE AREA
Serving drivers and fleets in Bakersfield, Shafter, and Kern County, including the I-5 and Highway 99 corridors.
Call with your location and service needs to confirm arrangements.
BEFORE YOU BOOK
Our repair and maintenance focus is Freightliner Cascadia trucks with Detroit DD13 and DD15 engines. For Clean Truck Check OBD testing, call with your engine year and vehicle details to confirm eligibility.
Yes. We can review the result and help diagnose and repair related aftertreatment or electrical issues. The next step depends on the test result and vehicle condition.
We provide CARB Clean Truck Check OBD emissions compliance testing for eligible heavy-duty vehicles. This service is distinct from a passenger-car Smog Check.
Your truck and engine year, DD13 or DD15, fault codes, symptoms, location, and recent repair history. For compliance testing, include your deadline and any prior test result or CARB notice.
LET’S TALK ABOUT YOUR TRUCK
Tell us your Cascadia’s year, DD13 or DD15 engine, and what’s happening. For testing, have your engine year and compliance notice or test result ready.
(661) 386-8090 ↗Call to confirm service arrangements and availability.