Medium & Heavy Duty Truck Repair and Diagnostics in
Illinois

Medium and heavy duty trucks endure constant stress, high mileage, and tough working conditions. Even minor issues can escalate quickly if they’re not addressed properly, leading to costly downtime, reduced efficiency, or even catastrophic failures on the road. That’s why early, accurate diagnostics and expert repairs are so important for truck owners and fleet managers. Common problems like faulty sensors, transmission issues, brake wear, or suspension failures need immediate, professional attention to keep operations smooth and prevent expensive breakdowns.

At J&R Service Center, we take truck repair seriously. Our ASE Certified Master Technicians use advanced diagnostic tools tailored for medium and heavy duty trucks to identify problems precisely. We don’t believe in guesswork—only informed repairs based on solid testing and experience. From engines and transmissions to braking systems and driveline components, we service all major truck systems with attention to detail and a focus on long-term reliability. Plus, with our 3-year/50,000-mile warranty on most repairs, you can trust that your investment is well-protected. Whether you manage a fleet or operate a single workhorse vehicle, we are your trusted partner for keeping your trucks running strong.

Why Choose Us:

J&R Service Center has been a trusted name in medium and heavy duty truck repairs since 1996. Our Diamond and Gardner, IL locations are staffed with ASE Certified Master Technicians who understand the complexity of modern truck systems. We are proud to offer honest diagnostics, expert repairs, and a 3-year/50,000-mile warranty on most services to ensure you get reliable performance and peace of mind.

Service Process:

When you bring your truck to J&R Service Center, we start with a complete diagnostic scan using advanced equipment built for heavy duty vehicles. We carefully evaluate your engine, transmission, suspension, braking systems, and driveline for faults. After identifying any issues, we present clear repair options and timelines. Once approved, our skilled technicians perform all necessary repairs using high-quality parts, followed by final system testing to confirm full functionality before your truck returns to the road.

Key Benefits:

• Medium and heavy duty truck specialists with ASE Certified Master Technicians
• 3-year/50,000-mile parts and labor warranty on most repairs
• Advanced diagnostic capabilities for accurate problem identification
• Fast, reliable service designed to minimize your downtime
• Family-owned shop focused on honest communication and quality workmanship

When your truck needs expert service you can depend on, J&R Service Center is here to help. We provide full-service medium and heavy duty truck repair and diagnostics for drivers and fleets throughout Diamond, Gardner, and surrounding Illinois communities. Our ASE Certified Master Technicians deliver accurate diagnostics, professional repairs, and trusted advice—all backed by our 3-year/50,000-mile parts and labor warranty for added confidence.

Don’t let minor problems turn into major setbacks. Schedule your medium and heavy duty truck repair or diagnostics with J&R Service Center today. Whether it’s a single repair or comprehensive fleet maintenance, we’re ready to keep your vehicles operating at peak performance. Visit our Diamond or Gardner location and experience the difference expert truck service makes.