Top-Rated In-Shop & Onsite Truck Repair Services

Full-Service Truck Repair Shop in Plaistow, NH

Diesel Truck Repair for All Makes & Models
On-Site Fleet Maintenance & Mobile Truck Repair
Trusted, Family-Owned Business – Serving Since 2017
Truck Roadside Assistance – Within 50 Miles
Roadside Service Available Daily Until 10PM – Emergency Support on Nights & Weekends

Call Now (603) 819-5359

Driving Directions

Fast, Reliable, and Certified Diesel Technicians

Founded in 2017 by seasoned technician and military veteran Seth Bubar, Tri-State Diesel Repair was built on one mission: to deliver reliable, honest, and fast truck repair service across New Hampshire, Massachusetts, and Maine. From our shop in Plaistow, NH, we’ve grown into a trusted name for diesel repair, mobile truck repair, and full-scale fleet maintenance.

We know breakdowns don’t wait. That’s why we operate fully equipped mobile units and offer support to keep your trucks moving. Whether you're a fleet operator, independent hauler, or construction crew, you can count on our certified diesel mechanics in Plaistow, NH for quality work—done right the first time.

Our name reflects our reach. Our service reflects our values. If you're searching for a dependable truck repair shop near me, you've found your long-term partner in Tri-State Diesel Repair.

Ready to Get Back on the Road?

Trust the experts at Tri-State Diesel Repair. Call (603) 819-5359 today for dependable truck repair, diesel mechanic service, and fleet maintenance in Plaistow, NH.
Mobile, reliable, and built for your business.

Request Service Now

Call Now (603) 819-5359

Why Choose Us

Built on Skill. Backed by Integrity. Driven by Service.

When it comes to truck repair, diesel diagnostics, and fleet services, Tri-State Diesel Repair stands out as the trusted choice for drivers and businesses across southern New Hampshire and northern Massachusetts.

We offer:

Veteran-founded values and work ethic
Two fully equipped mobile service trucks
From fleet service to roadside help, Plaistow trusts us
Honest pricing & clear communication
Fast turnaround for working professionals
Expert diesel mechanics in Plaistow, NH

Repair Services for Trucks, Trailers, Equipment & RVs

DOT Inspection
Diesel Repair
Truck Preventive Maintenance
Mobile Truck Repair
Roadside Assistance
Heavy Equipment Repair
Trailer Repair
Truck Welding & Fabrication
Semi Truck Maintenance
Mobile Truck Repair
Mobile Truck Tire Repair & Replacement
Mobile Truck Battery Replacement
Forced Regen Services

Fleet Services
Wheel Seal Repair
Performance ECM Tuning
Hydraulic Cylinder Rebuild & Repair
Axle Repair
Brake Repair
Coolant System Repair
Diagnostics & Electrical Repair
Engine Overhaul Services
Cooling System Service and Repair
Scheduled Fleet Maintenance
Radiator Replacement for OTR Trucks
Head Gasket and Front Cover Reseal
Engine Swap – 1998 Chevy 3500 (350 Gas Engine)
Advanced Truck Diagnostics
Diesel Engine Repair

Driveline Repair
EGR & DPF
Express Lube Repair
Exhaust System Repair
HVAC System Repair
Oil & Fluid
Suspension Repair
Tire Repair
Transmission & Clutch Repair
Emission System Repair
ABS Brake System Repair
Electrical System Repair
Check Engine Light Diagnostics
Shock and Strut Replacement

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Trusted for Mobile Truck Repair & Diesel Service in Plaistow, NH

We’re proud to be the diesel repair shop drivers and fleet managers rely on across southern NH and northern MA. See what real customers say about their experience with Tri-State Diesel Repair.

Our Service Area - Serving All Neighboring Areas

Tri-State Diesel Repair is a veteran-owned truck and trailer repair company based in Plaistow, NH, offering expert mobile diesel repair, fleet maintenance, and roadside assistance across Southern NH and Northern MA. Trusted. Fast.

TERMS AND CONDITIONS

Contact Us

147 Mile Hill Rd, Belmont, NH 03220

51 Kingston Rd, Plaistow, NH 03865

Call Us(603) 819-5359