When you’re searching for expert diesel truck repair in Colorado, you’re not just looking for a shop that works on diesel. You’re looking for people who truly understand it. At Branch Automotive, we’re not generalists who dabble in diesel. We’re True Diesel Specialists.
Located in Littleton, CO, just minutes from Highlands Ranch, our team is built on deep factory training, real-world experience, and a passion for diesel engines. We work on the platforms we know and believe in, Duramax, Cummins, and Powerstroke, and we treat every truck like it’s our own. Whether you’re hauling loads through the Rockies or using your diesel as a daily driver, we understand what it takes to keep your truck running strong in Colorado conditions.
Why We Call Ourselves True Diesel Specialists
We didn’t pick that slogan just to sound impressive. We chose it because it defines exactly who we are. At Branch Automotive, diesel trucks are not part of what we do. They are the only thing we do.
We don’t work on every make and model. We focus on the vehicles we know best. That allows us to go deeper into the details of your platform. It means we’re not learning on your truck; we’re applying years of focused experience to fix problems quickly and correctly.
Specializing in diesel repair allows us to offer better value, faster turnaround times, and more consistent results. It also helps us keep the shop running efficiently. We stock the right parts, use the right tools, and know the repair procedures inside and out.
Our Technicians Know Diesel
Our shop is staffed by some of the most qualified diesel professionals in the region. Most of our team has factory training from GM and Ford, and several are ASE Certified Diesel Technicians, including Master Technicians and a GM World Class Master Diesel Mechanic, a distinction held by only a few elite technicians nationwide.
What Does “GM World Class” Really Mean?
Being a GM World Class Technician means completing hundreds of hours of specialized training and passing rigorous testing in electrical systems, drivability, engine performance, HVAC, and more. It’s a certification that takes years to earn, and only a small percentage of technicians ever achieve it. For you, it means your diesel is in the hands of someone who’s reached the top of their field.
Our Ongoing Commitment to Training
Every technician at Branch Automotive completes annual continuing education, keeping them up to date with emerging diesel technologies. From updated emissions systems to new factory service procedures, we make sure we’re never behind the curve. That’s why diesel truck owners from Highlands Ranch to Littleton trust us to get things right the first time.
Integrity Is at the Core of Our Team
Skill and training are essential, but so is character. One of the things that truly defines Branch Automotive is the integrity of our team. We trust our technicians completely, and so do our customers.
We don’t believe in upselling or scare tactics. We believe in giving our clients honest assessments, explaining our findings clearly, and recommending only what’s truly necessary. It’s how we build relationships, not just service tickets.
We understand that your diesel truck is how you get things done. Our job is to keep it reliable so you can stay focused on work, family, and everything else life demands.
Common Diesel Issues We See and Solve
Thanks to our experience and specialization, we’re able to quickly identify and solve many of the most common and costly diesel truck problems. Here are a few examples we see regularly:
Turbocharger Failures
Colorado’s altitude and steep grades put extra strain on turbos. We often see power loss or whistling noises that signal turbo problems. Our diagnostics pinpoint issues fast, and our OEM-level parts and procedures ensure long-lasting repairs.
EGR and DPF System Trouble
Diesel emissions systems are sensitive and prone to clogging, especially for trucks doing frequent short trips. We provide full diagnostics and cleaning or replacement services to keep your truck compliant and running clean.
Fuel Injector and High-Pressure Pump Failures
If you’re experiencing rough starts, hard acceleration, or excessive smoke, we’ll inspect your fuel delivery system using precise pressure testing and factory scan tools.
Electrical and Sensor Malfunctions
Today’s diesel engines rely on dozens of sensors. We use manufacturer software to read real-time data and identify electrical gremlins that universal scan tools often miss.
Built for Colorado Diesel Drivers
You can’t fix what you can’t diagnose accurately. That’s why Branch Automotive uses manufacturer-grade scan tools for GM, Ford, and Dodge diesel platforms. These allow us to interface with your vehicle just like a dealer would, but with more personalized service and better turnaround times.
We also use a chassis dynamometer, which lets us simulate driving conditions under load right inside our shop. This is essential for identifying performance issues that might not appear during a typical test drive.
These tools, combined with expert knowledge, mean faster repairs and fewer repeat visits.
Maintenance Advice from Diesel Experts
Preventative maintenance is the foundation of diesel reliability. Skipping it doesn’t save money — it turns into bigger repair bills later. Here’s what we recommend:
- Oil changes every 5,000 miles to protect critical engine components and support proper emissions operation
- Transmission flushes and filter changes especially if you tow or drive in mountain terrain
- DPF and EGR cleaning to avoid regeneration problems and keep emissions in check
- Cooling system inspections to prevent overheating
- Filter replacements for fuel, air, and cabin systems
- Use of OEM parts only — we strongly advise against tuners, aftermarket intakes, or fuel system modifications
Regular maintenance is the key to extending the life of your truck and preventing costly repairs. Our team works with you to build a schedule that fits how you drive and what your truck needs.
Full-Service Diesel Repairs at Branch Automotive
We offer a wide range of diesel-specific services, including:
- Full diagnostics
- Emissions testing (state-certified)
- Turbo and injector repair
- Transmission services
- Fuel system diagnostics and repair
- Engine repair and rebuilds
- DPF and EGR system service
- Drivetrain inspection
- Tires, brakes, and alignments
- Oil and fluid services
- Factory maintenance programs
As one of Colorado’s few certified diesel emissions testing facilities, we also help keep your truck compliant with state regulations.
Trusted Diesel Shop in Highlands Ranch and Littleton
Branch Automotive is proud to be a NAPA AutoCare Center and offer a 3-year / 36,000-mile nationwide warranty on most repairs. We are trusted throughout the South Denver metro because we back up our work with real accountability.
We also live by our shop philosophy: Better Value. Better Industry. Better Life. That means better communication, better practices, better technicians, and better results for you.
We’re proud of what we do, and we take pride in doing it right.
Frequently Asked Questions About Diesel Truck Repair in Colorado
What are the most common signs that my diesel engine needs repair?
The most common signs include loss of power, rough idling, excessive smoke, or unusual noises under load. These symptoms often point to issues with fuel injectors, turbochargers, or emissions systems. Getting diagnostics early can prevent major repairs.
How often should I service my diesel truck’s fuel system?
You should service the fuel system every 15,000 to 25,000 miles, depending on manufacturer recommendations and driving conditions. Filters, fuel lines, and injectors are parts that commonly degrade under heavy load or after long idle periods in cold weather.
Why does my diesel truck emit excessive smoke?
Excessive smoke usually results from incomplete combustion, often caused by clogged air filters, dirty injectors, or problems with the fuel delivery system. Different smoke colors (black, white, blue) can point to distinct issues. Identifying which helps mechanics diagnose correctly.
Schedule Expert Diesel Truck Repair in Highlands Ranch, CO
At Branch Automotive, you’re not just another repair ticket. You’re part of a diesel-driving community that deserves the highest level of care. We take the time to understand how you use your truck and tailor our services to match.
If you’re ready to work with True Diesel Specialists who are trained, trusted, and passionate about what they do, we’d be honored to serve you.
Visit us at:
6030 E County Line Road, Littleton, CO 80126
Call:
(303) 771-2224
Or schedule your diesel service online now
Choose Branch Automotive, trusted by diesel owners across Colorado for expert service, clear communication, and dependable results.
