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Gernentz Automotive, LLC

"Car Care You Can Trust"

About Us

Gernentz Automotive, L.L.C. is built on more than 65 years of hands-on experience, family pride, and a commitment to doing every job the right way. What began as a small hometown repair shop in Royal, IL has grown into a trusted automotive partner for drivers throughout St. Joseph, Ogden, Gifford, Penfield, and the surrounding communities. As a family-owned and operated business, we believe every customer deserves honest guidance, dependable workmanship, and the confidence that their vehicle is in capable, caring hands.

Over the years, we’ve expanded our capabilities to meet the demands of today’s vehicles—offering full-service auto and light-truck repair, tire services, brake maintenance, diagnostics, collision repair, and more. Even as technology evolves, our core values never change: treat people with respect, fix the problem right the first time, and stand behind every repair we make.

At Gernentz Automotive, we’re proud to be a familiar and trusted name in the community—known for transparency, reliability, and a level of service that goes beyond the repair bay. Whether you’re here for routine maintenance or a more complex issue, our skilled technicians are dedicated to keeping you safe on the road, mile after mile.

Areas Served

Our Professional Associations

National Federation of Independent Business (NFIB)
Maxxis Authorized Dealer
Better Business Bureau Accredited Business

Our Certifications

Certified
Insured
Bonded

What We Offer

Our Specialties include:

At Gernentz Automotive, L.L.C., their specialty lies in delivering complete, dependable care for both cars and light trucks—combining the precision of advanced diagnostics with the hands-on craftsmanship of full-service mechanical and collision repair. Whether it’s restoring a vehicle after an accident, fine-tuning engine performance, servicing brakes and suspensions, or keeping tires, batteries, and essential systems in top condition, the team approaches every job with skill, integrity, and a deep commitment to safety. From routine maintenance to complex repairs, Gernentz Automotive prides itself on being the shop drivers can trust for honest guidance, quality work, and long-lasting results.

Our Services include:

Full-Service Auto & Light Truck Repair: From routine maintenance to major repairs, Gernentz Automotive provides comprehensive care for most makes and models of cars and light trucks. Their skilled technicians handle everything under the hood and under the frame, ensuring your vehicle stays dependable, efficient, and ready for the road.
Collision Repair & Body Work: Accidents happen—but Gernentz Automotive is there to restore your vehicle with precision. Their collision repair services include structural work, dent repair, panel replacement, and refinishing. The goal is simple: return your car to its pre-accident condition with quality craftsmanship you can trust.
Brake Services: Safety starts with reliable brakes. Whether it’s pads, rotors, calipers, or full-system service, Gernentz Automotive offers thorough brake inspections and repairs to keep your stopping power strong.
Tire Services (Repair, Rotations, Mounting & Balancing): From fixing punctures to installing new tires, the team ensures your vehicle is riding safely and smoothly. Rotations and precision balancing help extend tire life and improve handling, giving you confidence on every drive.
Oil Changes & Preventative Maintenance: Regular oil changes are the foundation of a healthy engine. Gernentz Automotive provides quick, quality oil changes alongside routine maintenance checks to keep your vehicle running clean, cool, and efficient.
Air Conditioning & Heating Repair: When temperatures rise or fall, your comfort matters. The shop services A/C and heating systems—from refrigerant charging to component replacement—so your cabin stays comfortable year-round.
Tune-Ups & Engine Optimization: If your vehicle feels sluggish or less fuel-efficient than usual, a tune-up can bring it back to life. Gernentz Automotive inspects and replaces key components like spark plugs, filters, and ignition parts to restore smooth performance.
Suspension & Steering Repair: For a smooth, controlled ride, the health of your suspension system is essential. The team diagnoses and repairs shocks, struts, bushings, ball joints, and steering components to eliminate shaking, bouncing, or uneven tire wear.
Advanced Diagnostics: Modern vehicles require modern solutions. Using advanced diagnostic equipment, the shop pinpoints electrical and mechanical issues accurately—saving you time, money, and guesswork.
Battery Testing & Replacement: Whether your car won’t start or your battery is showing signs of weakness, Gernentz Automotive provides reliable testing and replacement to ensure dependable starts in every season.

Our Brands include:

AC Delco Professional Service Center
Interstate Batteries
Sea Foam
Good Year
Maxxis
Kumho
FS Lubricant
AND MORE

Our Products include:

Tires
Batteries
Wiper Blades
Ice
Candy
Chips
Soda

Testimonials

On 5/31/2026 Lance L. had this to say:
Called Gernentz to see if they could look at car to check why tire kept loosing air. They said if we dropped it off, they would look at it that afternoon. We dropped car off at approximately 11:30 am & told them we didn't want to spend a lot because car was old with 270,000+ miles. We asked them to call before doing anything. They called within 2 hours and said it was simply a cracked valve stem and it was $30 to replace it. They had the car ready for us to pick up by 2:00. We appreciate they kept the repair simple and inexpensive and didn't try to say it needed more than was necessary. Will definitely go back and would definitely recommend!!!

On 1/24/2026 samia woodward had this to say:
I only wish I had known about this shop 6 years ago. Truly has been a God send. It takes a while to get in, but it's well worth the wait! They always know what they are doing and they do it with excellence!

On 1/16/2024 jason williams had this to say:
Great place, friendly people

On 12/15/2023 Anita Lieb had this to say:
had a flat tire, and it was fixed promptly and reasonable.

On 3/10/2023 Deb Siuts had this to say:
They know what they are doing, do a great job, are kind, and all around great people! Highly Recommend! Testimonial written by Deb Siuts on this site.

Contact Us

Gernentz Automotive, LLC
102 E. Main St. Royal, IL 61871
Phone: (217) 583-3200
Email: gernentzautomotive@gmail.com

Parking Lot

Where To Find Us

Payment Types Accepted

Debit & Credit Cards, Checks

Our Hours

Holiday Hours May Vary. Please Call For Details.

Monday: 8:00 AM - 5:00 PM
Tuesday: 8:00 AM - 5:00 PM
Wednesday: 8:00 AM - 5:00 PM
Thursday: 8:00 AM - 5:00 PM
Friday: 8:00 AM - 5:00 PM

News

A smooth ride makes all the difference 🚘🛞 From tire repairs, rotations, mounting, and balancing to suspension and steering repairs, we help your vehicle handle better and last longer. If you’re experiencing shaking, bouncing, or uneven tire wear, our team will diagnose the issue and get you back to a controlled, comfortable drive.
#TireService #SuspensionRepair #SteeringRepair #GernentzAutomotive #SmoothRide

FAQ

Can you service electronic parking brakes on newer model cars?

Yes, we can service electronic parking brakes on most newer model cars.

Do you offer computer programming for car systems?

Yes, we now offer computer programming for most makes and models of cars. Please call us for questions and further inquiries.

What types of cars do you service? Can you do body work or alignments?

We service both foreign and domestic cars. We do not offer auto body work or alignments.

Can I walk in for car repairs, or do I need an appointment?

Repairs are by appointment only, but walk-ins are welcome for smaller repairs if we have availability.

What do you charge for diagnostics?

The cost for diagnostics can vary based on complexity and time. Please give us a call for more details.