Locally owned diesel shop in Billings, Montana – select your truck to see what we can do for it.

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Diesel Tuning - Diagnostics - PCM Programming

Diesel expertise. Honest service.

Performance you can trust.

Locally owned in Billings, Montana. We find the real problem, explain your options, and help you decide without the upsell.

Cummins - Power Stroke - Duramax

What we do

Services

Stop guessing

Diesel Diagnostics

Professional scan tools and real troubleshooting to find the root cause of stubborn issues.

Book a diagnostic

Built around your truck

Custom Tuning

Tuning set up for how you work, tow, haul and drive, with realistic expectations up front.

Ask about tuning

Specialized tools

PCM Programming

Specialized electronic programming for Cummins, Power Stroke and Duramax control modules.

Get programming

Upgrade with a plan

Performance Solutions

Performance upgrades matched to your goals, explained clearly before any work starts.

Plan your build

Platforms we specialize in

Shop by platform

Dodge / Ram

Cummins

Ford

Power Stroke

Chevrolet / GMC

Duramax

406

Diesel Works

Billings, Montana - Independently owned

About 406 Diesel Works

Your truck deserves more than guesswork

At 406 Diesel Works, we believe your truck deserves more than guesswork. Whether you rely on your diesel for work, towing, recreation, or everyday driving, you deserve knowledgeable service, honest answers, and solutions tailored to your needs.

Locally owned and operated in Billings, Montana, 406 Diesel Works specializes in diesel diagnostics, custom tuning, PCM programming, and performance solutions for Cummins, Power Stroke, and Duramax platforms.

We’re passionate about diesel technology and understand that every truck, every customer, and every situation is different. That’s why we focus on identifying the problem, explaining your options, and helping you make informed decisions without unnecessary upselling.

Built on knowledge. Driven by integrity.

We believe trust is earned through quality work, clear communication, and doing what we say we’re going to do.

As an independently owned business, we take a personal approach to every vehicle that comes through our doors. You’re not just another repair order or a number on a schedule. Your truck matters, your time matters, and your confidence in our work matters.

From advanced diagnostics to specialized electronic programming and performance tuning, our goal is to provide dependable, professional service with the attention to detail your investment deserves.

The difference

Why choose 406 Diesel Works?

Diesel-Focused Expertise

Specialized services for Cummins, Power Stroke, and Duramax trucks.

Honest Communication

Straightforward explanations and realistic expectations.

Personalized Service

Individual attention from a locally owned and operated business.

Advanced Technology

Professional diagnostic equipment and specialized tuning and programming tools.

Commitment to Quality

A focus on getting the job done correctly, not simply getting it done quickly.

Locally owned

Billings, Montana

Diesel only