GMC Auto Repair Shop in Smithtown, NY

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Service and Repair of GMC Vehicles

GMC vehicles are designed for strength, durability, and comfort, making them a top choice for drivers who demand more from their trucks and SUVs. At A & R Auto Repair in Smithtown, NY, we specialize in providing complete service and repair solutions for GMC owners. Whether you drive a Sierra, Yukon, Acadia, or Terrain, our ASE-certified technicians deliver expert care using modern diagnostic tools supported by Worldpac and Technet.

Our GMC services cover everything from preventive maintenance to major repairs. We understand the importance of keeping your vehicle in top condition, especially for those who depend on it for family use or heavy-duty work. By combining Certified Auto Repair recognition with our 12-month/12,000-mile warranty, we ensure lasting results and complete confidence in every repair.

When you bring your GMC to A & R Auto Repair, you’ll experience transparent communication, honest recommendations, and high-quality workmanship. Drivers in Smithtown, NY trust us to deliver dependable service that extends the life of their vehicles and keeps them performing at their best year after year.

GMC Sierra, Yukon & Acadia Service in Smithtown, NY

From the Sierra and Canyon pickups to the Yukon, Acadia, and Terrain SUVs, our ASE-certified technicians service GMCs that work for a living as well as the ones that handle school runs. We handle oil changes, brake service, check-engine diagnostics, suspension repair, and engine and drivetrain work, plus routine maintenance to keep a truck earning instead of sitting. Every job is backed by our 12-month/12,000-mile warranty and quality parts from Worldpac and Technet.

Frequently asked questions

  • Do you service GMC Sierra, Yukon and Acadia models in Smithtown?

    Yes. Our ASE-certified technicians service GMCs at our Smithtown, NY shop — the Sierra pickup, the Yukon and the Acadia — covering oil changes, brakes, suspension, diagnostics, and engine and drivetrain repair. Every repair carries our 12-month/12,000-mile warranty.

  • My Sierra or Yukon has a tick from the engine or is using oil — what causes that?

    On GM V8s with cylinder deactivation, a tick or rising oil consumption often traces back to a collapsed lifter or the deactivation hardware itself. These are two different repairs with very different costs, so we test to establish which one you have before quoting anything.

  • Do you service GMC four-wheel drive and towing setups?

    Yes. We service transfer cases and differentials, inspect brakes and cooling under towing loads, and check trailer wiring. If you tow regularly with a Sierra or Yukon, we will set a maintenance interval based on how you actually use the truck rather than the generic schedule.

  • Does the Acadia's V6 have timing chain problems?

    The 3.6-liter V6 used in the Acadia can develop timing chain wear as mileage builds, and it usually announces itself with a rattle at startup and a stored engine code. We verify it properly before recommending the work, because the same noise can come from cheaper causes.

  • Do you offer a warranty on GMC repairs?

    Yes — all of our work is covered by a 12-month/12,000-mile warranty, using quality parts sourced through Worldpac and Technet.

Rely on the Word of Others

Trusted by your neighbors for honest repairs in Smithtown, NY

Reviews Stars Rating | A & R Auto Repair

5-star Review by Skylar Cain

"They have a great system that you can see what needs to be done or should be done soon with pictures for each one so you know exactly where the problem is coming from. I have brought my car in many times and it is very fairly priced for the amount of work done. I have always been greeted and treated very well. I can not thank and recommend A&R enough!"

Reviews Stars Rating | A & R Auto Repair

5-star Review by M M

"I wish I can add 100 more stars! The team at A&R were all super helpful and accommodating when I had a last minute issue with my car. All pricing was explained up front and they helped set up a tow truck to pick up my car. They kept me informed every step of the way and made life easier knowing my car was in good hands. I will definitely be coming back for all my mechanical needs for my car. Thanks again!"

Comprehensive Automotive Care for Every Driver

Quality Repairs and Maintenance Designed to Keep You Moving

Need brake service, an oil change service, or wheel alignment in Smithtown? Our ASE-certified team has you covered.

Wheel Alignment

Our namesake specialty since 1977, we perform precise 2-wheel and 4-wheel alignments that correct pulling, uneven tire wear, and steering issues.

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NY State Inspections

Our team performs accurate New York State inspections, ensuring your vehicle meets safety and emissions standards before hitting the road.

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Oil Changes

Keep your engine running smoothly with affordable oil change services, whether you choose full synthetic, blend, or European import packages.

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Brake Repair

We diagnose and repair brake systems with precision, restoring stopping power and giving you confidence and safety while driving daily.

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GMC Repair Nearby

Expert GMC Repair and Maintenance in Smithtown, NY and the Surrounding Areas

Situated in the heart of Smithtown, A & R Auto Repair is proud to serve as a trusted destination for drivers seeking reliable and affordable automotive care. With ASE-certified technicians and a 12-month/12,000-mile warranty, our team ensures every vehicle receives expert attention—whether it’s routine maintenance or complex repairs. Conveniently located on East Main Street, our shop is easily accessible to residents throughout the area and neighboring communities.


We’re honored to serve customers not only in Smithtown but also in many surrounding towns across Long Island.

  • Lake Grove
  • Ronkonkoma
  • Central Islip
  • Deer Park
  • Dix Hills
  • Brentwood
  • Huntington
  • Northport
  • Islandia
  • Holbrook