Peterbilt Truck Repair in Austin, TX
Owner-operator pride or a working fleet unit — we service Peterbilt trucks in full-size bays, not a parking lot.
Peterbilt service at an independent Austin shop
A Peterbilt down is money not moving, so the work has to be right the first time. We handle PACCAR MX and Cummins power, the air systems, and the front-end and suspension work that keeps a long-nose tracking straight — with a shop full of lifts, alignment equipment, and parts instead of a service van.
Peterbilt models and drivetrains we service
- 379 & 389 — The classic long-nose trucks — steering, front axle and suspension work, and engine service.
- 567 & 579 — Current vocational and highway trucks with PACCAR MX-13 power and modern aftertreatment.
- PACCAR MX engines — Diagnostics, aftertreatment faults, and engine repair on MX-11 and MX-13.
- Cummins-powered Petes — ISX and X15 service — fuel systems, turbos, and emissions.
What we see fail on Peterbilt
- Aftertreatment derates — DPF loading, DEF quality and dosing faults, and SCR problems that shut a truck down mid-haul.
- Air system leaks — Slow build, dragging brakes, and leaks that show up on a DOT inspection.
- Front-end wear — Kingpins, tie rods, and steering slop that eats steer tires and wanders on the interstate.
- Suspension and alignment — Air bags, ride height, and alignment on both the truck and what it pulls.
- Electrical and sensor faults — Intermittent faults chased with live data rather than replaced on a hunch.
Peterbilt work we handle
- Engine diagnostics and repair on PACCAR MX and Cummins power
- Air brake service, including full brake jobs and air-system leaks
- Front-end, steering, kingpin, and suspension work
- Heavy-duty alignment for tractors and trailers
- Annual DOT/FMCSA inspections
- Aftertreatment work — DPF cleaning, DEF systems, and derate faults
Modern Diesel is an independent, Christian, veteran-owned shop — we service Peterbilt trucks but are not a dealer or affiliated with the manufacturer. Warranty coverage on our work is set with your service advisor at the time of service.
Related services
Other makes we service
Kenworth · Freightliner · Volvo · Mack · International · Isuzu · Hino
Bring it to the shop
We work on Peterbilt at our shop at 2900 N FM 973, Austin, TX 78725, serving the Greater Austin Area (Travis, Bastrop, Williamson, Hays) — Austin, Del Valle, Manor, Elgin, Pflugerville, Round Rock, and the surrounding counties. Call 512-717-2777 and tell us what it's doing, or send us the details and we'll get back to you.
Common questions
Can you do a DOT inspection on my Peterbilt?
Yes. We perform annual DOT/FMCSA inspections on trucks and trailers, and if something fails we can usually repair it in the same visit instead of sending you somewhere else and starting over.
My Peterbilt is in a derate from the aftertreatment. Can you clear it?
We diagnose why it derated — DPF loading, DEF quality or dosing, SCR efficiency, or a sensor — and repair the cause. Clearing a code without fixing what caused it only means the truck derates again, usually somewhere less convenient.
Do you have bays big enough for a long-nose truck?
Yes. Our shop at 2900 N FM 973 in Austin is set up for full-size trucks with lifts, alignment equipment, and parts on the shelf — which is what makes it possible to do big jobs that a mobile service van cannot.
Ready when you are.
Drop by the shop at 2900 N FM 973, Austin, TX 78725 or call and we’ll get you scheduled.