Expert Duramax Diesel Repair in Pataskala, OH

Built for Power. Repaired with Precision.

When you drive a Duramax-powered Chevy or GMC, you expect serious strength whether you’re towing equipment, hauling loads, or just getting the job done every day. These 6.6L diesel engines are built to work, but when something goes wrong like hard starts, white smoke, or loss of power it’s critical to have techs who know the ins and outs of Duramax systems.

At Tanzillo Automotive, we specialize in Duramax diesel repair. We work on all Duramax-equipped Chevy and GMC trucks from daily drivers to fleet workhorses. With ASE-certified techs and advanced diagnostic tools, we diagnose and repair issues accurately and honestly. No guesswork. No unnecessary parts. Just real answers and long-lasting repairs.

Duramax-Specific Services You Can Count On

Duramax trucks are built for serious work, but like any diesel platform, they need the right tools and training when something goes wrong. At Tanzillo Automotive, we offer targeted Duramax services backed by advanced diagnostics and real diesel experience. Whether it’s an injector issue, fuel pressure problem, or turbo failure, we’ve got it handled.

Advanced Duramax Diagnostics – We use dealer-level scan tools and scopes to track down issues across all Duramax platforms, from check engine lights to drivability concerns.
Injector Testing & Replacement – From rough idle to fuel smell or long crank times, we test balance rates and replace failing injectors with OE or better parts.
Turbocharger & Exhaust Repairs – We inspect VGT turbos, boost pipes, and actuators to fix power loss, lag, or smoke. Repairs or replacements are done to restore full boost.
Fuel System Service – We address fuel restriction, air intrusion, and CP3/CP4 pump problems with complete system diagnostics and high-quality part replacements.
Cooling System Repairs – Overheating? We service radiators, thermostats, water pumps, and degas bottles to keep your Duramax cool and protected under load.

Common Duramax Problems We Fix Every Day

If you’ve owned a Duramax for a while, you know certain issues tend to pop up over time, especially on older models. From high-pressure fuel system faults to cooling issues and turbo trouble, these engines require precision repairs and the right parts to keep going strong. These are just a few of the problems we see regularly in the shop.

Injector Failure

Duramax is known for injector problems, especially on older LB7 models. We test, diagnose, and replace failed injectors to restore smooth starts, power, and fuel efficiency.

Fuel System Problems

From clogged fuel filters to failing CP3 or CP4 pumps, we address fuel delivery issues that can lead to long cranks, poor performance, or engine damage.

Turbocharger Issues

Whining sounds, black smoke, or sluggish acceleration may point to turbo failure. We repair or replace worn turbo components to bring your boost back to life.

Glow Plug & Cold Start Problems

If your truck struggles to start in the cold, the issue could be faulty glow plugs, control modules, or battery voltage. We test the entire cold start system to find and fix the problem.

Cooling & Overheating Issues

From head gasket failure to coolant leaks and fan clutch problems, we diagnose overheating issues quickly and protect your Duramax from long-term damage.

Why Duramax Owners Trust Tanzillo Automotive

Diesel Truck Experts – We work on Duramax trucks every day and understand their unique systems.
Certified Technicians – Our team includes ASE-certified and dealer-trained diesel specialists.
Advanced Diagnostic Tools – We use the same level of equipment as the dealerships without the wait or upsell.
Fleet & Work Truck Ready – Business owners rely on us to keep their trucks running strong.
Strong Warranties – Most repairs are backed by our 2-year/24,000-mile or 3-year/36,000-mile warranty.
We Genuinely Care – Customers keep coming back because they trust our work and how we treat them.

Frequently Asked Questions

What are common issues with Duramax diesel engines?

Common issues with Duramax diesel engines include injector failure, turbo problems, fuel system leaks, glow plug issues, and overheating.

How often should a Duramax diesel be serviced?

A Duramax diesel should be serviced every 5,000 to 7,500 miles, including oil changes, fuel filter replacement, and coolant system checks.

Why is my Duramax losing power under load?

If your Duramax is losing power under load, the issue could be turbo boost loss, dirty fuel filters, injector problems, or a failing CP3/CP4 pump.

What does white smoke from a Duramax usually mean?

White smoke from a Duramax usually indicates unburned fuel or coolant entering the combustion chamber, often due to bad injectors or a head gasket issue.

Keep Your Duramax Running Strong. Book Your Service Today!

If your Duramax diesel isn’t running like it should, whether it’s hard to start, down on power, or showing warning signs, don’t let it turn into a bigger repair. At Tanzillo Automotive, we know what these engines need to stay reliable and powerful.

Our shop is located at 8282 National Rd SW, Pataskala, OH 43062, proudly serving drivers from Reynoldsburg, Etna, Newark, and the surrounding areas. Call 740 919-0830 or request your appointment online today.