Expert Duramax Repair for Carbondale and Beyond

When your Duramax isn’t pulling its weight, bring it to a team that knows diesel inside and out. At JW Diesel & Automotive, we specialize in Duramax diesel repair with dealer-level diagnostics, high-quality parts, and expert care that keeps your truck running at its best. Whether it’s routine service or major engine work, we’re the trusted shop for Duramax owners across the Western Slope.

Duramax Diesel: Proven Power, Built to Perform

Introduced by GM in 2001, Duramax diesel engines quickly earned their place in heavy-duty trucks with impressive horsepower, torque, and fuel economy. Designed for demanding work and reliable towing, Duramax powertrains combine cutting-edge technology with robust engineering. But like any high-performance platform, expert care is key to long-term performance.

Popular Duramax Models We Service:

LB7 (2001–2004): No EGR system, known for injector failures.
LLY (2004.5–2006): Improved design with EGR, but prone to overheating.
LBZ (2006–2007): Highly sought after for performance and reliability.
LMM (2007.5–2010): Added emissions controls, and common DPF/EGR issues.
LML (2011–2016): Stronger injection system, potential CP4 pump failures.
L5P (2017–present): Advanced performance, requires precision diagnostics.

Whether you use your Duramax for work or play, our team helps you get the most out of every mile.

Duramax Diesel Problems We See (and Fix)

Even the toughest trucks need maintenance. At JW Diesel, we’re trained to handle common Duramax issues with precision and speed:

Injector Failures: Especially on LB7s, worn injectors can lead to smoke, fuel dilution, and misfires.
Overheating Issues: Common in LLY models due to inadequate cooling systems, especially under load.
EGR & DPF Failures: Clogged exhaust components reduce power, fuel economy, and can trigger warning lights.
Turbo & Boost Leaks: Loss of power or strange noises can point to leaking intercooler boots or turbo wear.
CP4 Pump Failure: Found in LMLs, the high-pressure fuel pump can fail catastrophically if not addressed early.
Glow Plug & Sensor Faults: Sensor misreads and glow plug failure can cause hard starts and reduced performance.

Complete Duramax Diesel Repair Services

Our team is equipped with the tools, training, and parts to handle any Duramax job, from preventative maintenance to major engine repairs and replacements.

Duramax Engine Diagnostics

We use advanced, dealer-level scan tools to read manufacturer-specific codes and pinpoint exact issues. No guesswork, just precise diagnostics that lead to reliable, long-lasting repairs the first time around.

Turbocharger Inspection & Replacement

We test for boost leaks, evaluate VGT actuator performance, and replace failed units with OE-grade or better turbos. Whether it’s a power loss or sluggish throttle on your Duramax, we’ll get your performance back where it should be.

Fuel System & Injector Services

We test fuel pressure, flush contaminated systems, and replace failing injectors, CP3/CP4 pumps, and fuel filters. A clean, functioning fuel system is critical to your Duramax’s performance and longevity.

EGR, DPF & SCR Services

From deep cleaning to full replacement, we service your Duramax emissions systems to reduce soot buildup, restore performance, and keep you compliant with emissions standards.

Cooling System Repairs

Overheating can lead to serious engine damage. We inspect and repair radiators, thermostats, and water pumps to keep your Duramax running cool, especially during heavy towing, high-altitude driving, or under performance tuning.

Head Gasket & Top-End Repairs

We tackle head gasket failures, valve train problems, and other upper engine repairs with the precision your diesel demands. Our team uses premium components and thorough diagnostics to restore power, efficiency, and long-term reliability, without cutting corners.

Preventative Maintenance

We don’t just follow a checklist, we tailor services to how you use your truck. Oil changes, fuel filter swaps, and full fluid flushes are all matched to your Duramax’s workload, keeping you on the road and out of the shop.

Diesel Is Our Specialty, and Duramax Is No Exception

We don’t just service Duramax trucks, we know them. Here’s why truck owners across the Western Slope trust JW Diesel & Automotive:

Trained on All Duramax Generations

From LB7 to L5P, we understand every model’s unique needs and quirks.

OEM-Quality Parts & Dealer-Level Tools

We use the right parts and equipment for the job, no shortcuts or guesswork.

Diesel-Focused Shop Culture

Our shop was built for diesel trucks. It’s what we do all day, every day.

Fleet Priority Service

We make it easy for business owners with flexible scheduling, fast turnaround, and invoicing options.

Warrantied Work You Can Trust

Every repair is backed by our 12-month/12,000-mile guarantee for peace of mind.

Backed by Warranty

We stand behind our work with a 12-month / 12,000-mile warranty on parts and labor.

JW Diesel & Automotive

Diesel strong. Fleet ready. Driven to be the best.

Get Back on the Road, Schedule Duramax Service Today

If your Duramax is down on power, throwing codes, or just overdue for service, let JW Diesel & Automotive take care of it. We offer honest, expert Duramax diesel repair that’s done right the first time.

Visit us at JW Diesel & Automotive, 794 Industry Place, Carbondale, CO 81623 call (970) 510-5157 or text (970) 510-6344 to schedule your Duramax diesel repair today. Proudly serving Carbondale, Glenwood Springs, New Castle, Grand Junction, Eagle, Aspen, and beyond.

Driven to be the best.