Auto & Truck Repair & Maintenance,  Semi Truck & Diesel Repair, and Mobile Repair & Roadside Assistance

in Plainfield, IN and the Surrounding Areas

Gloved hands inspecting a car engine under the hood in a garage

Auto & Truck Repair & Maintenance

We provide full service car care for most makes and models of vehicles.

Mechanic working on a metal engine block in a workshop

Semi Truck & Diesel Repair

Our team specializes in diesel repair and maintenance.

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Mobile Repair & Roadside Assistance

We can come to you to fix everything from daily drivers to excavators.

Plainfield Diesel & Auto Repair

Honest Service. Fair Pricing

Locally owned and operated Plainfield Diesel & Auto Repair provides comprehensive in-shop and on-site auto repair, truck repair and diesel repair in Plainfield, IN for all daily drivers, commercial vehicles and heavy equipment.

Full Service Auto Repair

Car & Truck Repair

Semi Truck Repair

Fleet Repair

Heavy Equipment Repair

Gas & Diesel Engine Repair

Plainfield Diesel & Auto Specialist logo with black truck, gear, wrench, and smoke on dark badge

Transmission Repair

Auto Maintenance

Diesel Maintenance

Roadside Services

On-Site Repair & Diagnostics

Call First, Appointment Only

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Honest Auto, Truck & Diesel Repair When You Need It


Whether your commuter is giving you trouble and you need roadside assistance, your big rig requires maintenance, or an excavator is due for hydraulic services at the job site, our team of skilled technicians is ready to help. Based in Plainfield, our local car and truck mechanics are available seven days a week to provide services in our shop or at your location in Hendricks County and beyond. From factory maintenance, including oil changes and fluid services, to complex diagnostics and repairs for engines, transmissions and electrical systems, there is no issue we can’t solve for just about any gas or diesel vehicle. We invite you to give us a call to schedule an appointment or to request a quote for semi truck, fleet vehicle or other auto repair in Plainfield or the surrounding area. We look forward to providing you with honest service at a fair price.

The expert mechanics at Plainfield Diesel & Auto Repair are proud to help local drivers, fleet managers and owner/operators in Plainfield, Avon, Indianapolis and the surrounding areas care for their vehicles. To ensure we can provide the best automotive services for all types of cars, trucks and fleets, our team routinely invests in the latest diagnostic and repair tools, undergoes routine training to stay up to date with the latest technology and techniques, and strives to provide high quality services at affordable rates. We take customer service seriously and will always provide clear communication regarding your vehicle and make honest recommendations regarding services it may require.

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Row of automotive brand logos on a white background
Collage of eight truck and vehicle brand logos on a white background.

Our local auto repair and truck shop services all types of vehicles, including daily drivers, pickup trucks, contractor vehicles, work trucks, diesel trucks, trailers, big rigs and heavy equipment. We aim to provide fast turnaround times that don’t sacrifice quality, because we know that downtime costs you money. From in-house maintenance and repairs to roadside assistance and on-site vehicle services, trust Plainfield Diesel & Auto Repair to keep you moving. Give our Plainfield auto shop a call at 317-758-8099 to learn more about our gas and diesel services or to request an appointment at your convenience.

Customer Reviews

Thanks for trusting Proline Auto Care with your vehicles.

G and stars

Matt and his team were very nice guys, very easy to talk to and care about your vehicle not just mechanics trying to price gouge you and hurry the process along which is huge in my book. I'll definitely use their services again if needed. Thanks gentleman!

- M. B.

Blog

We invite you to monitor our News Blog for informative articles.

By Plainfield Diesel & Auto Repair August 8, 2026
Your vehicle's transmission is one of its most complex and important components. It transfers power from the engine to the wheels, allowing your car to shift smoothly and operate efficiently. Because transmission repairs and replacements can be expensive, taking a proactive approach to maintenance is well worth the effort. By combining routine service with good driving habits, you can help extend the life of your transmission. At Plainfield Diesel & Auto Repair, we provide expert transmission service in the greater Plainfield, IN area. Here are four tips for keeping your transmission in strong health for years to come. Keep the Transmission Fluid Clean and Full Transmission fluid plays a vital role in lubricating internal components, reducing friction, dissipating heat, and providing the hydraulic pressure needed for smooth gear changes. Over time, the fluid can become contaminated with dirt and other debris, reducing its effectiveness. Following your manufacturer's recommended schedule for fluid changes and checking the fluid level periodically can help prevent excessive wear. If you notice a transmission fluid leak, have it repaired promptly to avoid low fluid levels and potential damage. Always Stop Before Shifting Between Drive and Reverse A simple driving habit can make a big difference in the health of your transmission. Always bring your vehicle to a complete stop before shifting between drive and reverse. Shifting while the vehicle is still rolling places unnecessary stress on gears and other internal components. Making a full stop before changing directions helps reduce wear and contributes to a longer-lasting transmission. Avoid Excessive Heat Heat is one of the leading sources of transmission problems. Towing loads that exceed your vehicle's capacity, aggressive driving, and neglected maintenance can all increase transmission temperatures. If you regularly tow trailers or haul heavy cargo, follow your vehicle's towing guidelines and consider more frequent transmission inspections. Address Warning Signs ASAP Warning signs such as delayed shifting, slipping gears, grinding noises, burning smells, or transmission fluid leaks should be inspected as soon as possible. Catching problems early often allows for less expensive repairs and can prevent extensive internal damage. Ignoring these symptoms could turn a minor repair into a complete transmission rebuild or replacement. Transmission Service in Plainfield, IN For expert transmission service in Plainfield and the surrounding area, contact Plainfield Diesel & Auto Repair at  317-758-8099  . We provide top-quality auto repair for commuter vehicles and semi trucks. Feel free to give us a call to schedule an appointment!
By Plainfield Diesel & Auto Repair July 5, 2026
When something goes wrong with a semi truck’s cooling system, it can quickly lead to overheating, breakdowns, and costly repairs. Because of the system’s complexity, many drivers and fleet owners have questions about how it works, what can go wrong, and when repairs are needed. At Plainfield Diesel & Auto Repair, our local diesel mechanics are happy to answer your questions about semi truck cooling system repair in the greater Plainfield, IN area. What Does the Cooling System Do? The cooling system regulates engine temperature by circulating coolant through the engine, radiator, and related components. As coolant absorbs heat from the engine, it flows through the radiator where the heat is released. This continuous cycle prevents the engine from overheating during operation. What Are Common Warning Signs of Cooling System Problems? Common warning signs include rising engine temperatures, visible coolant leaks, low coolant levels, steam coming from the engine bay, or a sweet smell caused by leaking coolant. Drivers may also notice warning lights appearing on the dashboard. What Are Common Causes of Cooling System Failure? Cooling system failures can be caused by a variety of issues including worn hoses, failing water pumps, clogged or damaged radiators, faulty thermostats, or contaminated coolant. Over time, heat, pressure, and constant use can wear down components and reduce system efficiency. Can Cooling System Problems Lead to Major Engine Damage? Yes. If cooling system issues are not addressed promptly, the engine can overheat quickly. Overheating can cause serious damage such as warped cylinder heads, blown head gaskets, and internal engine failure. These types of repairs are typically far more expensive than addressing cooling system issues earlier on. Where Can I Get Semi Truck Cooling System Repair in Plainfield, IN? For expert semi truck cooling system repair in Plainfield and the surrounding area, contact Plainfield Diesel & Auto Repair at  317-758-8099  . At our local truck repair shop, we can properly handle your big rig’s repair and maintenance needs. Feel free to give us a call to schedule semi truck repair or maintenance in greater Plainfield, IN !