SOUTH GATE, CALIFORNIA | SERVING COMMERCIAL FLEETS SINCE 1990
HEAVY-DUTY TRUCK, TRAILER AND FLEET REPAIR
YOU CAN DEPEND ON
Commercial diesel repair, preventive maintenance, truck and trailer service, aftertreatment diagnostics, and inspection-related repair support for fleet operators, owner operators, and transportation businesses throughout Southern California.
ABOUT INTERSTATE FLEET MAINTENANCE
COMMERCIAL FLEET EXPERIENCE SINCE 1990
Interstate Fleet Maintenance, Inc. began as Interstate Truck and Trailer in 1990. From our South Gate facility, we support fleet operators, owner operators, trucking companies, and transportation businesses with heavy-duty truck repair, trailer service, preventive maintenance, diagnostics, aftertreatment service, and inspection-related repairs.
Learn About Our Facility
WHAT WE DO
HEAVY-DUTY TRUCK, TRAILER AND FLEET SERVICES
Commercial repair and maintenance services focused on dependable workmanship, accurate diagnostics, operational readiness, and clear customer communication.
Heavy-Duty Diesel Engine Repair
Diagnostics, repair, and component service for commercial diesel engines and related operating systems.
Trailer Repair and Structural Service
Trailer brake, suspension, electrical, floor, roof, panel, crossmember, landing-gear, and welding services.
Preventive Fleet Maintenance
Scheduled maintenance support intended to identify developing concerns and reduce unplanned downtime.
Engine, Electrical and Computer Diagnostics
Diagnostic evaluation of fault codes, warning lights, electrical concerns, and engine-performance issues.
DPF, DOC, SCR and One-Box Service
Diagnostics and service for diesel particulate filters, diesel oxidation catalysts, selective catalytic reduction systems, DEF components, and integrated one-box assemblies.
Drivetrain and Transmission Service
Inspection, diagnosis, and repair of transmissions, clutches, driveshafts, carrier bearings, axles, and related components.
Brake, Air and Suspension Repair
Commercial brake service, air-system diagnostics, suspension repair, air-bag replacement, and wheel-seal service.
Inspection Preparation and Corrective Repair
Vehicle evaluation, defect identification, customer-authorized repairs, and documentation support for commercial vehicle inspection requirements.
WHY CHOOSE INTERSTATE FLEET
BUILT AROUND COMMERCIAL VEHICLE SERVICE
More than three decades of commercial vehicle repair and maintenance experience.
Our operation is focused on trucks, tractors, trailers, and fleet equipment rather than passenger vehicles.
Services cover engines, transmissions, drivetrains, brakes, suspension, electrical systems, aftertreatment components, and trailer repairs.
A commercial repair facility serving customers throughout Los Angeles County and Southern California.
Organized parts-storage areas and supplier coordination support vehicle-specific repair operations. Parts availability varies by application.
Customers receive information about identified concerns and recommended work before customer-authorized repairs begin.
COMMERCIAL VEHICLE INSPECTION SUPPORT
CALIFORNIA 90-DAY AND FEDERAL ANNUAL INSPECTION SUPPORT
Interstate Fleet Maintenance helps commercial motor carriers prepare trucks, tractors, and trailers for applicable California vehicle-safety inspection requirements and federal periodic inspection requirements.
Services may include vehicle evaluation, defect identification, customer-authorized corrective repair, reinspection support, and repair documentation.
The motor carrier remains responsible for determining which requirements apply to its operation and for retaining required records. An inspection or repair does not guarantee a future roadside-inspection result or continuing regulatory compliance.
View Inspection ServicesREADY TO SCHEDULE SERVICE?
Contact our South Gate facility to discuss your commercial truck, trailer, or fleet-maintenance needs. Provide your unit information and reported concern, and our team will contact you to review the next steps.
Customer Reviews
What Our Customers Say
5.0
9 Google reviews
jose palacios
May 13, 2021
Danny G
Sep 17, 2025
Interstate Fleet Maintenance alway provides excellent service and this is where I bring in my business's diesel trucks for maintenance and service. I know that they'll do great work and have the expertise and knowledge to handle anything related to our moving trucks! If you're looking for a dependable shop - this is the place!
Bobby Linnes
Aug 20, 2025
Well run commercial truck repair facility. Quick, secure and convenient. Comfortable area to relax you're waiting for truck. Work done as estimated. Thanks guys 😁
Jim David
Jun 13, 2025
Clayton was awesome in helping with a tire issue on our RV in Gallup.
Kage Gill
Apr 1, 2025
Im working on the altadena fire clean up. I need quick repair. They took me in. Repair and out back to work. Very clean Organized Awsome service Professionals in there field
Dejan Jakovljevic
Feb 27, 2025
Great service and very polite and professional staff . Highly recommended.
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Interstate Fleet Maintenance, Inc.