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Sidney:(937) 658-9412
Brookville (Dayton):(937) 991-3050

Cummins Engine Service & Repair

Expert diagnostics, maintenance, and repair for all Cummins diesel engines at our Sidney and Brookville, Ohio locations

About Cummins Inc.

Cummins is a global power leader that designs, manufactures, distributes and services diesel and natural gas engines. Known for reliability and innovation, Cummins engines power everything from pickup trucks to 18-wheelers.

Headquarters:

Columbus, Indiana, USA

Founded:

1919

Specialties:

Diesel EnginesNatural Gas EnginesTurbochargersEmission Solutions

Cummins Engine Models We Service

ISX15

Displacement:15L
Power:400-605 HP
Torque:1450-2050 lb-ft
Years:2013-present

Applications:

  • Heavy-duty trucks
  • Vocational trucks

X15

Displacement:15L
Power:400-605 HP
Torque:1450-2050 lb-ft
Years:2017-present

Applications:

  • Heavy-duty trucks
  • Coach buses

ISL9

Displacement:8.9L
Power:260-450 HP
Torque:720-1250 lb-ft
Years:2007-present

Applications:

  • Medium-duty trucks
  • Vocational trucks

ISB6.7

Displacement:6.7L
Power:200-360 HP
Torque:520-800 lb-ft
Years:2007-present

Applications:

  • Medium-duty trucks
  • School buses
  • RVs

L9

Displacement:8.9L
Power:260-450 HP
Torque:720-1250 lb-ft
Years:2017-present

Applications:

  • Medium-duty trucks
  • Vocational applications

B6.7

Displacement:6.7L
Power:200-360 HP
Torque:520-800 lb-ft
Years:2017-present

Applications:

  • Medium-duty trucks
  • Pickup trucks

Common Cummins Fault Codes

SPN 3597 FMI 2

EGR Valve Controller - Data Erratic

Symptoms:

  • Reduced power
  • Black smoke
  • Poor fuel economy

Possible Causes:

  • Faulty EGR valve
  • Wiring issues
  • ECM problem

SPN 3251 FMI 0

DPF Differential Pressure - High

Symptoms:

  • Frequent regenerations
  • Reduced power
  • Check engine light

Possible Causes:

  • Clogged DPF
  • Faulty pressure sensor
  • Exhaust restriction

SPN 5246 FMI 0

SCR System - Abnormal Update Rate

Symptoms:

  • Derate condition
  • Poor NOx conversion
  • Increased DEF usage

Possible Causes:

  • SCR catalyst issue
  • DEF quality problem
  • Sensor failure

SPN 1569 FMI 31

Engine Protection Torque Derate

Symptoms:

  • Limited power
  • Reduced speed
  • Limp mode

Possible Causes:

  • High coolant temp
  • Oil pressure issue
  • Multiple active faults

Experiencing a fault code? Our certified technicians can diagnose and repair any Cummins engine issue.

Get Diagnostic Help

Cummins Maintenance Schedule

Oil & Filter Change

Every 15,000-25,000 miles

Use CES 20086 approved oil for X15/ISX15, CES 20081 for ISL9/L9

Critical

Fuel Filter Replacement

Every 15,000-25,000 miles

Replace both primary and secondary fuel filters

Critical

DEF Filter Replacement

Every 200,000-300,000 miles

Prevents DEF system contamination and injector issues

Recommended

Valve Adjustment

Every 150,000-200,000 miles

Maintain proper valve lash for optimal performance

Critical

DPF Cleaning

Every 200,000-400,000 miles

Professional cleaning extends DPF life and prevents restrictions

Recommended

Coolant System Service

Every 250,000-300,000 miles

Replace coolant and check for cavitation/corrosion

Critical

Cummins Emission Systems

DPF System

Diesel Particulate Filter captures and burns off soot particles

Maintenance Tips:

  • Allow proper regeneration cycles
  • Use low-ash CJ-4 oil
  • Avoid excessive idling
  • Monitor differential pressure

Common Issues:

  • Frequent regeneration requests
  • Face plugging from coolant leaks
  • Ash accumulation requiring cleaning
  • Cracked filter elements

SCR System

Selective Catalytic Reduction converts NOx to nitrogen and water

Maintenance Tips:

  • Use only API certified DEF
  • Keep DEF tank above 1/4 full
  • Replace DEF filter as scheduled
  • Check for crystallization at injector

Common Issues:

  • DEF quality sensor faults
  • Injector clogging
  • NOx sensor failures
  • DEF pump issues

DEF System

Diesel Exhaust Fluid (32.5% urea solution) for NOx reduction

Maintenance Tips:

  • Store between 12°F and 86°F
  • Use within 1 year of manufacture
  • Never add additives
  • Keep containers sealed

Common Issues:

  • Contamination from improper handling
  • Crystallization in cold weather
  • Degradation from heat exposure
  • Wrong concentration

EGR System

Exhaust Gas Recirculation reduces combustion temperatures and NOx

Maintenance Tips:

  • Clean EGR cooler regularly
  • Check for carbon buildup
  • Inspect EGR valve operation
  • Monitor coolant flow through cooler

Common Issues:

  • Carbon buildup in cooler
  • Stuck EGR valve
  • Cooler efficiency loss
  • Cracked cooler causing coolant loss

Expert Cummins Engine Service at Two Convenient Locations

With over 15 years of experience, Wayne Truck & Trailer is your trusted partner for all Cummins engine repairs and maintenance.

Sidney Location

2151 S Vandemark Rd

Sidney, OH 45365

Call (937) 658-9412

Brookville Location

6455 Brookville Salem Rd

Brookville, OH 45309

Call (937) 991-3050

Serving Sidney, Brookville, Dayton, Piqua, Troy, Bellefontaine, and surrounding areas