Cummins Repair in Merrillville & Hobart IN
Driving a Ram truck with a Cummins engine under the hood? Then you already know it’s built for serious work. Whether you’re towing heavy loads, running a fleet, or just love the feel of raw diesel power, your truck deserves specialized care. That’s exactly what we offer at M&M Car Care Center. We provide expert-level Cummins repair in Merrillville & Hobart IN—with certified diesel techs, cutting-edge tools, and a reputation for honest, high-quality service.
What Makes Cummins Engines Different?
Cummins engines are some of the most reliable diesel engines on the road. Known for their torque, longevity, and heavy-duty performance, they’ve powered Ram trucks, commercial vehicles, and even RVs for decades. But even a Cummins engine isn’t bulletproof—it needs proper maintenance and occasional repairs from a diesel technician who understands the details.
These engines feature high-pressure fuel systems, variable geometry turbos, and complex emissions systems. They’re tough—but complicated. That’s why our team at M&M Car Care Center stays on top of training, diagnostics, and repair methods specifically for Cummins powerplants.
Common Cummins Problems We Fix
Even the most durable diesel engine will show signs of wear eventually. At M&M Car Care Center, we’re constantly fixing common Cummins issues like:
- Injector Failure
Rough idling, misfires, and white smoke are all signs you may need new injectors. - Turbo Problems
Whistling noises, laggy acceleration, and excessive exhaust smoke could mean your turbo needs repair or replacement. - EGR Valve Malfunction
A stuck or faulty EGR can cause check engine lights, poor fuel economy, and loss of power. - Diesel Particulate Filter (DPF) Clogs
Short trips and frequent idling can clog your DPF, leading to performance issues and possible limp mode. - Head Gasket Issues
Overheating or coolant loss could point to a failing head gasket, especially in older 5.9L models. - Lift Pump Failure
Without a functioning lift pump, your injection pump is at risk—this can cause hard starts and major performance loss.
We’ve seen it all, from the classic 5.9L to the newer 6.7L Cummins engines, and we’ve got the parts and expertise to fix it right the first time.
Complete Cummins Repair Services
Your Cummins engine deserves more than just a quick fix. At M&M Car Care Center, we provide full-service repair and preventative maintenance to keep your truck running strong—whether it’s your daily driver or your business’s most important tool.
Our Cummins Services Include:
- Full engine diagnostics & troubleshooting
- Injector testing and replacement
- Turbocharger repair and replacement
- EGR & DPF cleaning or replacement
- Fuel system repairs (lift pump, injection pump, filters)
- Cooling system service (radiators, thermostats, water pumps)
- Cylinder head & head gasket repair
- Glow plug and sensor replacement
- Preventative maintenance packages
- Emissions-compliant repairs
- Transmission service (if equipped)
We use OEM or high-performance aftermarket parts and back our work with a satisfaction guarantee. Your truck is in good hands.
Which Cummins Engines Do We Work On?
We service all generations and configurations of Cummins-powered vehicles. Whether it’s a weekend hauler or a fleet workhorse, we know what it takes to keep it on the road.
We repair all popular Cummins diesel platforms:
- 5.9L 12-Valve (1989–1998)
- 5.9L 24-Valve (1998.5–2007)
- 6.7L Cummins (2007.5–Present)
Our team is equipped to handle everything from old-school mechanical injection to today’s electronically controlled common-rail systems.
Cummins Maintenance: Key to Longevity
Want to keep your Cummins running past 300,000 miles? Then routine maintenance is a must. We make it easy to stay ahead of costly repairs with scheduled service, fluid changes, and inspections designed specifically for your engine type.
Here’s a quick guide to maintaining your Cummins diesel:
- Oil & Filter Change – Every 5,000–7,500 miles
- Fuel Filter Replacement – Every 15,000 miles
- Transmission Fluid & Filter – Every 30,000–60,000 miles
- Coolant Flush – Every 100,000 miles or 5 years
- Valve Adjustment – Every 150,000 miles (5.9L/6.7L)
- Air Filter – Inspect every oil change
Need help tracking your service intervals? We’ll build a custom maintenance plan that fits your driving style and keeps your Cummins engine running strong.
FAQs
How do I know if my Cummins injectors are going bad?
If your truck smokes a lot, struggles to start, or loses power under load, you might be dealing with worn-out injectors. We can test and replace them if needed.
Is the 6.7L Cummins better than the 5.9L?
Both engines are solid. The 5.9L is known for its simplicity and reliability, while the 6.7L offers more power, better emissions control, and smoother performance.
Why is my Cummins blowing black smoke?
Black smoke usually points to excess fuel or poor combustion—could be your turbo, injectors, air filter, or EGR system.
Can you clean or replace the DPF on a Cummins engine?
Yes—we offer DPF cleaning, diagnostics, and replacement if needed, all while staying within emissions compliance.
Do you service Ram 2500 and 3500 diesel trucks?
Absolutely. We work on all Ram heavy-duty models with Cummins engines, no matter the year.
Why Choose M&M Car Care Center?
You rely on your Cummins engine for tough jobs and big miles. Don’t trust it to just anyone. At M&M Car Care Center, we offer real diesel expertise backed by the kind of local customer service you won’t find at big dealerships.
Here’s why customers trust us:
- 4 Convenient Locations:
Serving Merrillville, Schererville, Dyer, Hammond, & Hobart IN—there’s always a shop close to you. - ASE-Certified Diesel Techs:
Our crew knows Cummins engines inside and out. - State-of-the-Art Diagnostics:
We invest in cutting-edge tools so we can find the problem fast and fix it right. - Honest, Transparent Pricing:
No surprises. No upsells. Just straight talk and fair quotes. - Fleet Service Available:
We work with local businesses to keep their Cummins-powered trucks moving without downtime.
Book Your Cummins Repair in Merrillville & Hobart IN
If your Ram truck is acting up or your check engine light is on, don’t wait for the problem to get worse. M&M Car Care Center is your trusted source for reliable, fast, and affordable Cummins repair in Merrillville & Hobart IN.
Give your nearest location a call today to schedule service or use our easy online booking tool. Need after-hours drop-off or quick turnaround for a work truck? We’ve got you covered. Come see why local diesel drivers trust M&M with their Cummins engines—and let’s get you back on the road with power and peace of mind.