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Monday - Friday 8:00 AM - 5:00 PM
Call Now (210) 598-7043

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At Tri-County Diesel Svc, we deliver expert care for diesel and heavy-duty trucks, specializing in Cummins engines, Freightliner, Kenworth, Peterbilt, and Isuzu models. Our ASE-certified team excels in diesel repair, brake service, suspension repair, and fleet maintenance. Whether you’re managing warning lights or needing advanced diagnostics, we provide reliable repairs and maintenance for all vehicles, ensuring your fleet’s peak performance.

  • Skilled in medium and heavy-duty repairs

 

  • Trusted by local businesses for fleet services

 

  • Equipped with certified parts and advanced tools 

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Specialized Diesel Repair

Tri-County Diesel Svc is your trusted destination for diesel repair on trucks, including Cummins, Freightliner, and Peterbilt models. We address all aspects from engine diagnostics to full-service engine rebuilds, ensuring your diesel-powered vehicle performs at its best.

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Brake and Suspension Services for Safe Journeys

We provide high-quality brake repair, ensuring safety with prompt diagnostics and repairs. Our suspension services optimize stability and comfort, ideal for long-haul and local drivers alike.

Reliable Fleet Maintenance and Diagnostics

Our skilled technicians offer proactive fleet maintenance to reduce downtime and extend the life of your vehicles. Utilizing advanced tools, we identify issues early, ensuring consistent reliability for your entire fleet.

Diesel engine & repair services:

  • Diesel engine repairs and overhauls  

  • Diesel particulate filter (DPF) cleaning and regeneration  

  • Electrical system diagnostics and repairs  

  • Emission system repairs and compliance checks  

  • Engine diagnostics and troubleshooting  

  • Exhaust system repairs and upgrades  

  • Performance enhancements and tuning  

  • Routine maintenance and oil changes  

  • Transmission repairs and servicing  

  • Turbocharger and fuel system repairs  

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WHAT CUSTOMERS SAY ABOUT US

My dad has been coming here for years to get his 18 wheeler fixed. Truman has always been so good to our family. Michelle, the office assistant is really great and so nice! We will continue to come here for diesel service. ❤️

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Google User Review

No other place I would take my truck to to get worked on... from the receptionist to the mechanic's they are very professional and they also have a sense of humor...if you are in need of getting your equipment fixed and fixed right Tri county is the place to get it done the right way .

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Google User Review

Good and fast service here.. my husband always brings his work truck here when needed and they fix issues fast.

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Google User Review

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