Serving Tyngsboro & The Merrimack Valley Since Day One

Commercial Truck &
Auto Diagnostics
You Can Count On.

From Class 8 diesel engines to daily drivers — we diagnose the problem, explain it plainly, and get it fixed right the first time. No guesswork. No upselling. Just honest, experienced hands on your vehicle.

Call Now — (978) 726-8705 View Our Services
15+ Years Experience
4.8★ Google Rating
3,000+ Vehicles Serviced
Mechanic working on a commercial truck engine in a professional repair shop
Close-up of diesel engine diagnostics being performed
ASE-Certified
Technicians
What We Do

Comprehensive Repair
For Every Fleet & Family Vehicle

Whether you run a delivery route or commute in a pickup, we provide the same level of care and precision — because your time on the road matters.

Engine Diagnostics & Repair

Computerized diagnostics for gas and diesel engines. We read codes, trace root causes, and fix them — not just clear the check engine light.

  • OBD-II & Heavy-Duty Scanning
  • Engine Performance Tuning
  • Timing Belt & Chain Service
  • Turbo & Supercharger Repair

Brake Systems

Complete brake inspection, repair, and replacement for cars, trucks, and commercial vehicles. Safety-focused, always.

  • Pad & Rotor Replacement
  • Brake Fluid Flush
  • ABS System Service
  • Commercial Air Brake Repair

Transmission & Drivetrain

From automatics to manuals, transmissions to differentials — we handle the power transfer that keeps you moving.

  • Transmission Rebuild & Service
  • Clutch Replacement
  • Transfer Case Repair
  • CV Axles & Half Shafts

Commercial Truck Service

Dedicated heavy-duty repair for Class 3–8 trucks. We keep your fleet on the road and your DOT compliance in check.

  • Class 4–8 Diesel Engines
  • DOT Inspection Prep
  • Fleet Maintenance Programs
  • DEF & Emissions Systems

Suspension & Steering

Ride quality and vehicle control start here. We diagnose noise, vibration, and alignment issues before they become expensive problems.

  • Strut & Shock Replacement
  • Wheel Alignment
  • Power Steering Repair
  • Ball Joints & Control Arms

Oil & Preventive Maintenance

Regular service prevents catastrophic failure. We follow manufacturer schedules and then some — because prevention is cheaper than repair.

  • Conventional & Synthetic Oil Changes
  • Fluid Exchange & Top-Off
  • Filter Replacement
  • Multi-Point Inspections
Interior of Rondon Truck and Auto Repair shop showing clean, organized workspace
Close-up of mechanic's hands using professional diagnostic equipment
15+ Years of
Hands-On Experience
About Us

Built on Trust,
Powered by Expertise

Rondon Truck & Auto Repair started with a simple belief: every driver — whether behind the wheel of a semi or a sedan — deserves a mechanic who treats their vehicle like their own.

Located on Middlesex Road in Tyngsboro, we've spent over 15 years building a reputation for honest diagnostics, fair pricing, and work that lasts. We service everything from compact cars to Class 8 heavy-duty trucks, and we don't cut corners to fit a schedule.

Transparent Pricing Upfront estimates before any work begins — no surprises on the bill.
ASE-Certified Technicians Our team holds industry certifications and trains continuously.
Warranty on Repairs We stand behind every job with a solid parts and labor guarantee.
Schedule a Service
Why Choose Us

The Rondon Difference
Is in the Details

01

You Call. We Listen.

Describe your issue, and we'll give you a straight answer — not a sales pitch. If we can't help, we'll tell you who can.

02

Diagnose First, Fix Second.

We don't throw parts at problems. Every repair starts with a thorough diagnosis so you only pay for what's actually needed.

03

Quality Parts, Every Time.

We use OEM or equivalent-quality components. Cheap parts fail fast — we build for the long haul.

04

Turnaround You Can Plan Around.

We communicate timelines clearly and stick to them. Your vehicle won't sit on a lift longer than necessary.

What Our Customers Say

Trusted by Drivers
Across the Valley

"I've been bringing my delivery vans here for three years. They're fast, honest, and they explain exactly what's wrong before they touch a wrench. That's rare."

M
Michael T. Local Delivery Fleet Owner

"My truck broke down on Route 127 and they took me in the same day. Found the problem quickly, gave me a fair price, and had me back on the road by afternoon."

S
Sandra R. Independent Contractor

"Finally, a shop that doesn't make you feel like you're in over your head when you ask questions. They take the time to walk you through everything. Highly recommend."

J
James K. Local Resident
Ready to Get Started?

Your Vehicle Deserves
Honest, Expert Care

Give us a call or stop by the shop. We'll diagnose the issue, explain your options, and get you back on the road — no pressure, no confusion.

Call (978) 726-8705 Send a Message
Get in Touch

Visit the Shop or
Give Us a Call

We're conveniently located on Middlesex Road in Tyngsboro. Walk-ins are welcome during business hours, but calling ahead helps us prepare for your visit.

Address

33 Middlesex Rd
Tyngsboro, MA 01879-2021

Business Hours

Mon–Fri: 8:00 AM – 5:00 PM
Saturday: 8:00 AM – 1:00 PM
Sunday: Closed

Send Us a Message

Tell us about your vehicle and the issue you're experiencing. We'll get back to you as soon as possible.

Message Sent!

Thanks for reaching out. We'll get back to you within one business day. For urgent matters, call us directly at (978) 726-8705.

Is this your business?This is my business