Fleet Maintenance & Repair in Rowland Heights, CA and the Surrounding Areas

As a local business, we take great pride in helping other area companies keep their fleet vehicles running strong. Our professional fleet mechanics service all makes and models of light, medium and heavy duty fleets, ranging from rental cars to big rigs. Whether you’ve got a single delivery van or a whole fleet of work trucks, you can rely on Diesel Zone Diagnostics for professional fleet vehicle maintenance in Rowland Heights and the surrounding communities. Give us a call to learn more about our fleet management services or to request an appointment for expedited fleet repair or scheduled service.
- Commercial Vehicle Repair
- Commercial Vehicle Maintenance
- Fleet Management Services
- Light, Medium & Heavy Duty Fleets
- Semi Truck Repair & Maintenance
- Fleet Oil Change & Tune Up
- Fleet Engine & Transmission Services
- DOT Inspections
- Diesel Fleet Repair
- Glow Plug Replacement
- Fleet Brake Repair
- Emissions Services
- Delivery Van Repair & Maintenance
- Rental Car Fleet Maintenance
- Delivery Vehicle Maintenance
- Expedited Fleet Services
Semi Truck Repair & Maintenance
Our diesel mechanics provide full service semi truck repair in Los Angeles County. Whether your tractor trailer is giving you sudden semi engine trouble, semi truck transmission problems or big rig brake issues, or requires routine big rig maintenance, we’re here to help. We also provide trailer repair services, including electrical repairs and chassis services, ensuring your semi and trailer is safe from the headlights to the rear doors. To learn more about our extensive Rowland Heights semi repair shop, don’t hesitate to give us a call or stop by at your convenience.

Light & Medium Duty Fleet Repair & Maintenance
Diesel Zone Diagnostics is staffed by skilled technicians who can provide exceptional care for your light duty and medium duty fleets. This includes servicing gas and diesel rental cars, delivery vans, shuttle buses, emergency vehicles, government vehicles and diesel work trucks. From engine repairs and transmission services to routine oil changes and other factory fleet maintenance, count on us to keep your business on the road.

Heavy Duty Fleet Repair & Maintenance
We are proud to be the truck shop in our community that is trusted to keep heavy duty fleet vehicles performing like new day after day. Our fleet mechanics provide expert service for semi trucks, refuse trucks, cement mixers, dry vans, dump trucks, fire engines, city buses and other large vehicles. We know how valuable these vehicles are to your operation, which is why we work fast to minimize downtime and maximize performance. At the first sign of trouble, or when you need heavy duty fleet maintenance in Rowland Heights, please give us a call.
Diesel Engine Repair & Maintenance
If you’re searching for a diesel mechanic near me, you’ve found the best in the area. Our certified diesel techs service all makes and models of diesel engines and vehicles. We care for diesel engines and diesel vehicles such as Cummins, PowerStroke, Duramax, International, Caterpillar, Volvo diesel, John Deere, Kenworth, Freightliner, Peterbilt, Mack and more. Don’t let performance problems end your work day, visit us for professional diesel repair in Rowland Heights and we’ll get you back on the road fast.
DOT Inspections
Federal law dictates that any vehicle that weighs more than 10,000 pounds must have an annual Department of Transportation inspection to remain legally licensed. Our team offers DOT semi truck inspections, as well as inspections for other heavy duty vehicles. This service ensures that all parts and components of the vehicle are in good condition and that the rig is safe to drive. During an inspection, we’ll check parts such as the brakes, exhaust, lights, tires and suspension. If you need a DOT inspection in Rowland Heights, we’ve got you covered.

Our team is grateful for the chance to help truckers and local businesses keep their owner-operated and corporate fleet vehicles healthy. If you'd like to inquire about fleet vehicle management or schedule an appointment for commercial vehicle maintenance in Rowland Heights, please call Diesel Zone Diagnostics at (323) 834-9858. We look forward to assisting with your light, medium and heavy duty vehicle service needs.