Riley Auto Care& Transmissions
Riley Auto Care & Transmissions auto repair shop exterior on TX-123 in San Marcos TX
Riley Auto Care mechanic working on a vehicle in the service bay in San Marcos TX
Riley Auto Care mechanic performing engine and transmission repair in San Marcos TX
Riley Auto Care & Transmissions service bays with vehicles undergoing auto repair in San Marcos TX
Riley Auto Care & Transmissions auto repair shop building on TX-123 in San Marcos TX
Riley Auto Care & Transmissions mechanic team in San Marcos TX — serving Central Texas since 1978
Riley Auto Care & Transmissions logo

Providing Quality Auto Care Solutions in San Marcos, TX
Riley Auto Care & Transmissions

Complete Car Care

OEM Quality Parts

Financing Available

Schedule Service
Riley Auto Care mechanic performing auto repair and maintenance service in San Marcos Texas

⎯ Est. 1978

Serving San Marcos & Central Texas
with Expert Automotive
Care and Repair

At Riley Auto Care & Transmissions, we have been a cornerstone of the San Marcos, TX automotive community since 1978. For nearly five decades, drivers across Hays County and Central Texas have trusted us with their most important investment — their vehicles. That trust was not built overnight. It was earned one honest repair, one transparent estimate, and one satisfied customer at a time. When you bring your car, truck, or SUV to our shop, you are not just another work order. You are a neighbor, and we treat you like one.

Our commitment to the San Marcos community runs deeper than the services we provide. We sponsor local events, support area schools, and take genuine pride in being a locally owned and operated auto repair shop that has watched this city grow. We have serviced vehicles for parents, and now we service vehicles for their children. That kind of multigenerational loyalty is something we never take for granted, and it drives everything we do — from the quality of parts we install to the way we communicate with every customer who walks through our door.

Whether your check engine light just came on, your brakes are grinding, your A/C stopped blowing cold, or your transmission is slipping, our certified technicians have the training and factory-grade diagnostic equipment to find the problem fast and fix it right the first time. We specialize in transmission rebuilds and repairs, full-service auto maintenance, brake service, engine diagnostics, air conditioning and heating repair, and much more. No matter what you drive — domestic, import, gas, or diesel — we have the expertise to keep it running at its best.

We believe that great auto repair starts with honest communication. Before we touch your vehicle, we walk you through exactly what we found, what it will cost, and why it matters. We never recommend repairs you do not need, and we never pad an estimate to increase our bottom line. Our reputation in San Marcos, TX is built on integrity, and we intend to keep it that way. Every repair we perform is backed by a warranty, because we stand behind our work long after you drive off our lot.

Financing is available through trusted partners so that a major repair never has to derail your budget. We also accept all major credit cards and work hard to get your vehicle back to you as quickly as possible, because we know your time matters. From quick oil changes and routine maintenance to complex engine and transmission overhauls, Riley Auto Care & Transmissions is the full-service auto repair shop San Marcos and Central Texas drivers have counted on for generations. Come see us — we would love to earn your trust too.

⎯ Testimonials

Words from our Customers in San Marcos, Texas

4.8
out of 5 on Google
200+ Google Reviews
C
Chris M.
June 2026

Best transmission shop in Central Texas

My F-250 was slipping bad between 2nd and 3rd gear. Riley's diagnosed it same day, gave me a straight quote, and had it rebuilt in under a week. Shifts like new. They even called me twice with updates without me having to ask. This is how a shop is supposed to run.

2017 Ford F-250 Super DutyTransmission Rebuild
S
Sandra L.
June 2026

Honest, fair, and fast

I was quoted $3,800 at another shop. Riley's looked at it, told me it only needed a solenoid pack and a fluid flush — came out to $420. They could have easily told me I needed a full rebuild and I wouldn't have known the difference. That kind of honesty is rare. I'll never go anywhere else.

2015 Chevrolet EquinoxTransmission Service
D
Derek W.
May 2026

Transmission rebuild + HP Tuners tune — incredible combo

Had my 6L80 rebuilt and got an HP Tuners tune done at the same time. The truck pulls harder than it ever did from the factory. The guys here actually know what they're doing — they explained every step and the tune was dialed in perfectly for my mods. Worth every penny.

2019 GMC Sierra 1500Transmission Rebuild + HP Tuners

⎯ Our Story

EST.
1978

Meet Our Founders

Bob and Joan Riley opened Riley Transmissions in San Marcos, Texas in 1978 with a simple promise: treat every customer like family and do the job right the first time. Bob, a U.S. Air Force veteran, brought the discipline and precision of military service to every repair.

Nearly five decades later, that same commitment drives everything we do — still family owned, still rooted in the San Marcos community, and still the most trusted name in transmission and auto repair in Hays County.

Honesty

No surprises, no upsells — just straight talk about what your vehicle needs.

Integrity

Doing the right thing for every customer, every time.

Community

Proudly serving San Marcos and Central Texas for over 45 years.

Riley Auto Care & Transmissions shop exterior on TX-123 in San Marcos TX
Bob Riley — founder of Riley Auto Care & Transmissions in San Marcos TX
Bob and Joan Riley — founders of Riley Auto Care & Transmissions since 1978
Riley Auto Care financing

⎯ Finance Your Repair

Making Auto Care
More Affordable for Drivers in San Marcos, Texas

Easy financing options available — no credit needed options through Kornerstone, or flexible payment plans with Synchrony Car Care.

Apply Now

⎯ Our Blog

From the Owner

More Blog Posts →
July 4, 2026

Happy 4th of July from the Riley Family!

Wishing everyone in San Marcos and the surrounding area a safe and happy Independence Day! Our shop will be closed today so our team can celebrate with their families. We'll be back open Monday, July 7th, ready to take care of all your auto repair and transmission needs. God Bless America! — The Riley Family

Read more
Expert Brake Repair You Can Count On
June 29, 2026

Expert Brake Repair You Can Count On

Brakes aren't just another system — they're your vehicle's most important safety feature. At Riley Auto Care & Transmissions in San Marcos, we take pride in delivering expert brake repair you can count on. Schedule your brake inspection today.

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Auto Electrical Repair & Diagnostics
June 24, 2026

Auto Electrical Repair & Diagnostics

Your vehicle relies on a complex electrical system — from the alternator and starter to the battery and wiring. When one of these fails, you may notice dim lights, trouble starting, or warning lights on your dashboard. Trust an auto technician at Riley Auto Care & Transmissions for expert electrical repair and diagnostics. Reach out today to schedule your appointment.

Read more

⎯ Stay Connected

Stay Connected with Riley Auto Care

Follow us for the latest updates, specials, and community news. Join the Riley family today!

⎯ Service Area

Quality Auto Repair Nearby

Conveniently located in the heart of San Marcos, TX. Riley Auto Care & Transmissions is the trusted destination for expert transmission and auto repair in Central Texas.

Get DirectionsBook an Appointment

⎯ Trusted & Accredited

Recognized for Quality & Integrity

BBB Accredited Business

BBB Accredited Business

24 Month 24,000 Mile Warranty

24 Mo / 24K Mile Warranty

ATRA Member

ATRA Member

4.8200+ Google Reviews

Google Verified

Est.1978

Serving Since 1978

⎯ Careers

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