Cummins Engine Repair in Valencia CA

 

Trusted Diesel Mechanics for Ram Trucks & Work Vehicles Since 1987

 

Cummins-powered trucks are known for reliability, pulling power and long-term performance. But even the best diesel engines need experienced hands for maintenance and repair. At RG Brakes & Alignment, we provide professional Cummins repair in Valencia CA backed by 35+ years of diesel expertise.

BOOK AN APPOINTMENT

If you drive a Ram 2500, 3500 or manage a light-duty commercial vehicle equipped with a Cummins engine, our shop is ready with the tools and experience to keep your vehicle running strong. We handle everything from routine maintenance to complex diagnostics. Our team also specializes in diesel repair in Valencia CA, including Power Stroke and Duramax systems, but we’ve built a loyal base of Cummins owners who count on us for honest, efficient service.

To schedule Cummins engine service, call us at (661) 259-7098 or visit shop at 24309 Creekside Rd #110, Valencia, CA 91355.

Santa Clarita Cummins Diesel Services

Car Engine Diagnostics

Check Engine Light Diagnostics

Cummins engines are controlled by sophisticated electronic modules (ECMs) that monitor sensors across the entire drivetrain. When a warning light appears, we use Cummins-compatible diagnostics to scan, interpret and isolate the issue – from injector faults to turbo boost irregularities or emissions codes.
engine

Turbocharger Inspection and Repair

A properly functioning turbo is key to Cummins performance. If you’re losing power, hearing a high-pitched whine or noticing increased smoke, your turbo may be failing. We inspect turbo systems for shaft play, wastegate problems and boost pressure inconsistencies, and offer full replacement or repair using OEM-spec parts.
DPF and Emissions System Repair

EGR System Service

Exhaust Gas Recirculation (EGR) valves can become clogged with carbon buildup, especially in trucks used for stop-and-go or short trips. A failing EGR can lead to sluggish acceleration, rough idle or DTCs. We clean or replace faulty EGR components to restore performance and emissions compliance.
Tune Up Services

DPF Cleaning and Regeneration Support

The Diesel Particulate Filter (DPF) traps soot and requires periodic regeneration. We inspect DPF health, check for excessive backpressure and can assist with forced regeneration or DPF replacement if needed.
Heating Repair

Glow Plug & Heater Grid Replacement

Hard starts in cold weather often point to worn glow plugs or faulty intake heater grids. These components are critical to ignition timing and fuel atomization. We test, diagnose and replace glow plug systems for reliable cold starts.
Driveline Repair

High-Pressure Fuel System Diagnostics

The Cummins high-pressure common rail system (HPCR) is sensitive to contamination and pressure loss. If you’re experiencing rough idle, misfiring or low fuel economy, we inspect injectors, fuel pumps, sensors and regulators using live data analysis.
Oil Change

Oil and Fuel Filter Service

Keeping clean oil and fuel is crucial to protecting your injectors, turbo and internal engine components. We replace filters at Cummins-recommended intervals using OEM-spec parts and check for signs of contamination during every service.
Cooling System Repair

Cooling System Repairs

We replace worn thermostats, water pumps, radiator hoses and coolant tanks to prevent overheating – especially important in hard-working diesel trucks that carry or tow heavy loads.
Belt and Hose Replacement

Belt and Pulley Inspections

A squealing serpentine belt or worn pulley can cause accessory failure or poor alternator output. We inspect belt tension, replace cracked belts and adjust pulley alignment as needed.
Preventive Car Maintenance

Electrical System Diagnostics

We test charging systems, replace alternators and batteries and resolve wiring faults in Cummins-equipped vehicles. If you’re seeing dim headlights or intermittent starts, we’ll trace the cause and fix it fast.
Transmission Repair

Transmission Diagnostics for Diesel Trucks

Heavy-duty trucks with Cummins engines often pair with 68RFE or Aisin transmissions. We diagnose shifting issues, delayed engagement, fluid leaks and solenoid faults, helping extend the life of your transmission.
Exhaust Repair

Preventive Diesel Maintenance

From fuel system cleaning to fluid flushes and safety inspections, our preventive maintenance services are tailored to Cummins-powered vehicles. We help reduce downtime and keep your truck working when you need it most.

Need fast service for your American car or truck? Call us today at (661) 259-7098 or book an appointment here.

Common Vehicles We Service

We repair and maintain all Dodge and Ram trucks equipped with Cummins engines, including both legacy and modern models:

  • Ram 2500 & 3500 (5.9L and 6.7L Cummins)
  • Ram 4500 & 5500 chassis cabs
  • Ram 3500 dually and tow setups
  • Dodge Ram 2500/3500 models from early 2000s and late 1990s
  • Fleet and light-duty commercial vehicles using Cummins ISB, ISF or B-series engines

No matter if your truck is used for towing, hauling, daily driving or commercial work, we provide reliable service that helps extend engine life and improve performance.

I was a walk-in customer, but the people at RG made my job a priority on a Saturday morning, made sure the parts needed to be replaced were available, and finished the work in just a couple hours. I even had time to get some lunch while they did all the work! Other place like the dealer would just tell me to come back on Monday. Great customer service at RG! – Allen Kelly

BEST CUMMINS ENGINE REPAIR IN VALENCIA CA

Why Diesel Owners in Santa Clarita Trust RG Brakes

We’re not a chain or a volume shop. We’re a family-owned diesel repair facility serving Santa Clarita Valley since 1987.

  • Cummins engine diagnostics and repair
  • Full-service diesel and heavy-duty truck capability
  • Transparent quotes and upfront recommendations
  • 2-year warranty on parts and labor
  • Fast turnaround and same-day diagnostics in most cases
  • Located in Valencia near the Town Center – easy access from anywhere in SCV
  • Saturday walk-ins accepted (first come, first served)

ase certified mechanics valencia ca

ABOUT US

#1 Car Repair Shop
in Valencia Since 1987

9119

CARS REPAIRED

24

24 MONTH WARRANTY

2125

HAPPY CUSTOMERS

Book Cummins Mechanics in Valencia, CA Today

If you rely on your Cummins engine for work, towing or daily use, don’t leave repairs to chance. Our technicians understand the unique demands of diesel engines and offer solutions that last. From performance issues and emissions warnings to scheduled maintenance, we’ll diagnose the problem and fix it correctly.

Call us now to schedule a service or bring your truck in and let us take a look. From the latest Ram 3500s to reliable workhorses with 250,000+ miles, we’ll keep your Cummins running like it should.

Call (661) 259-7098 to schedule engine repair or diagnostics
Visit RG Brakes & Alignment at 24309 Creekside Rd #110, Valencia, CA 91355
Mon–Fri: 7:30am–5:00pm, Sat: 8:00am–3:00pm
Online booking available — submit appointment requests at least 24 hours in advance

Note: Appointments at 8:00 AM on Mondays are not available. Saturday appointments are walk-in only and handled on a first-come, first-served basis.

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  • APPOINTMENT DATE & TIME

    NOTE: Please submit your appointments at least 24 hours in advance. Appointments at 8:00 AM on Mondays are not available. Saturday appointments are walk-in only and handled on a first-come, first-served basis.

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Frequently Asked Questions

What are the most common Cummins engine issues?

Cummins owners may experience EGR valve failure, clogged DPF filters, turbocharger wear, injector issues and crankcase pressure problems over time. Regular maintenance and proper diagnostics can catch these problems early and prevent major repairs.

How often should I change the oil in my Cummins engine?

Most 6.7L Cummins engines should have oil changes every 6,000–10,000 miles, depending on use. Short trips, heavy towing or idle time can shorten intervals. We always inspect oil quality and recommend changes based on actual condition, not just mileage.

Why is my Cummins diesel blowing black smoke?

Black smoke often indicates incomplete combustion, which could be caused by dirty injectors, a faulty EGR valve, excessive fueling or a failing turbocharger. We diagnose the cause and fix it to restore fuel economy and clean operation.

Can I perform a forced regen on my truck?

Yes, but it’s important to know why the DPF system failed in the first place. We can initiate a forced regen if needed, but we also test sensors and airflow to find the root cause so you’re not repeating the issue weeks later.

How do I know if my glow plugs are failing?

Hard starting in cold weather or rough idle at startup can point to weak or failed glow plugs. We’ll test the system and replace plugs or heater grids as needed.

Do you use Cummins-approved parts?

Yes. We use OEM or OEM-equivalent parts designed to meet Cummins engine requirements, including filters, gaskets, sensors and fluids.