Diesel Truck Repair & Maintenance in Moscow Mills, MO
Dependable Service for Ford Powerstroke, Ram Cummins & Chevy/GMC Duramax Diesels Along the US-61 Corridor
Whether you rely on your diesel pickup for heavy towing, farm and contractor work, or daily commuting across Lincoln and St. Charles Counties, downtime isn't an option. At Certified Performance & Auto Repair, our ASE-certified technicians provide thorough, accurate diesel diagnostics, routine factory maintenance, and heavy-duty mechanical repairs right off Highway 61 in Moscow Mills, MO.
As a NAPA Gold Certified AutoCare Center, we back qualifying diesel repairs with a nationwide 36-Month / 36,000-Mile Peace of Mind Warranty—giving you dealership-level diagnostic capability with honest, local service.
Diesel Engines We Service
We service and repair light-duty and medium-duty diesel trucks, commercial work vans, and fleet vehicles, including:
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Ford Powerstroke Diesel: 6.7L, 6.4L, 6.0L, and 7.3L (F-250, F-350, F-450, F-550 Super Duty & E-Series)
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Ram / Dodge Cummins Turbo Diesel: 6.7L and 5.9L (Ram 2500, 3500, 4500 & 5500) and 3.0L EcoDiesel
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Chevy & GMC Duramax Diesel: 6.6L (L5P, LML, LMM, LBZ, LLY, LB7) and 3.0L Duramax (Silverado & Sierra 2500HD / 3500HD)
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Light-Duty & Commercial Fleet Diesels: Sprinter vans, box trucks, and commercial utility trucks
Computer Diagnostics &
Check Engine Light Troubleshooting
Modern diesel engines rely on complex high-pressure fuel systems, turbochargers, and emissions sensors. If your truck is experiencing hard starts, loss of pulling power, excessive exhaust smoke, rough idling, or "Limp Mode," we use factory-grade scan tools to pinpoint the exact root cause before recommending repairs.
Fuel Injection & High-Pressure Fuel System Service
Contaminated fuel or worn components can quickly damage expensive diesel fuel systems. We test, service, and replace:
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High-pressure fuel injection pumps (including CP4 and CP3 systems)
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Diesel fuel injectors and return lines
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Lift pumps, water separators, and dual fuel filter replacements
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Fuel system contamination flushing and cleaning
DPF, EGR & Diesel Emissions System Repair
Issues with your truck's aftertreatment system can derate your engine and leave you stranded. We diagnose and repair:
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DPF (Diesel Particulate Filter): Forced regenerations, pressure sensor diagnostics, and DPF cleaning or replacement
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EGR (Exhaust Gas Recirculation): EGR valve and EGR cooler testing, cleaning, and replacement
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DEF & SCR Systems: DEF heater, injector, pump, and NOx sensor troubleshooting
Turbocharger, Intercooler & Boost System Repair
From sticking Variable Geometry Turbo (VGT) vanes and worn actuators to boost leaks in charge air cooler (intercooler) boots and up-pipes, we restore lost boost pressure and towing performance.
Cooling System, Head Gaskets & Engine Repair
Heavy towing puts massive thermal stress on diesel cooling systems. We handle water pumps, thermostats, radiators, oil coolers, glow plugs and controllers, serpentine belts, and upper/lower engine reseals.
Heavy-Duty Steering, Suspension, Brakes & Lift Kits
A heavy diesel engine takes a toll on front-end components. We eliminate "death wobble" and uneven tire wear with heavy-duty ball joints, tie rods, track bars, steering stabilizers, hydroboost brake repairs, and custom suspension lift kit installations.
Preventative Diesel Maintenance & Fleet Service
Routine maintenance is the best way to protect a 300,000+ mile diesel engine. Our preventative services include:
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Heavy-duty diesel oil and filter changes (meeting exact OEM API CK-4 / FA-4 specs)
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Primary and secondary diesel fuel filter changes (every 10,000–15,000 miles)
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Transmission, transfer case, and front/rear differential fluid service
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Commercial fleet maintenance scheduling to minimize work truck downtime
Why Diesel Owners Trust Certified Performance
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36-Month / 36,000-Mile NAPA Gold Warranty: Qualifying parts and labor are covered nationwide at over 14,000 NAPA AutoCare locations. (Learn more on our Warranty page.)
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20+ Years Serving Local Truck Owners: Independently owned and operated since 2005 with a 4.9-star rating across 600+ customer reviews and an A+ BBB Accreditation.
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Upfront Communication: We inspect your truck thoroughly, explain what needs immediate attention versus what can wait, and never perform repairs without your approval.
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Flexible Payment Options: We accept NAPA EasyPay and CarCare ONE financing to help manage major diesel repairs.
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Convenient Drop-Off: Early bird / night drop box available right off Hwy 61 at 1030 Industrial Ct.
Frequently Asked Questions About Our Diesel Service
How often should I change the fuel filters on my diesel truck?
Most Powerstroke, Cummins, and Duramax trucks require fuel filter changes every 10,000 to 15,000 miles (or every other oil change). Clean fuel filters and regular water separator draining are the #1 defense against costly high-pressure fuel pump and injector failure.
Can you diagnose a diesel truck that is in "Limp Mode" or shows a "Service Exhaust System" warning?
Yes. We perform full OEM-level diagnostics on DPF, DEF, EGR, and turbocharger systems to clear fault codes properly, perform forced regens when appropriate, and replace only the failed sensors or components.
Do you work on commercial diesel work trucks and local business fleets?
Absolutely. We partner with contractors, landscapers, agricultural operations, and commercial fleets across Lincoln and St. Charles Counties to provide priority maintenance and repair turnaround.
Do you perform Pre-Purchase Inspections on used diesel trucks?
Yes! Buying a used diesel pickup is a major investment. Before you buy, bring it in for our comprehensive Pre-Purchase Inspection so we can check for blow-by, hidden diagnostic trouble codes, fluid leaks, emissions tampering, and front-end wear.
Schedule Your Diesel Repair or Maintenance Today
Proudly serving diesel truck owners in Moscow Mills, Troy, Wentzville, Flint Hill, Old Monroe, Winfield, Hawk Point, and throughout Lincoln and St. Charles Counties along the US-61 corridor.
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Hours: Monday – Friday: 8:00 AM – 5:00 PM (Night Drop Available)