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:
Cummins Engine Models We Service
ISX15
Applications:
- Heavy-duty trucks
- Vocational trucks
X15
Applications:
- Heavy-duty trucks
- Coach buses
ISL9
Applications:
- Medium-duty trucks
- Vocational trucks
ISB6.7
Applications:
- Medium-duty trucks
- School buses
- RVs
L9
Applications:
- Medium-duty trucks
- Vocational applications
B6.7
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 HelpCummins Maintenance Schedule
Oil & Filter Change
Every 15,000-25,000 miles
Use CES 20086 approved oil for X15/ISX15, CES 20081 for ISL9/L9
Fuel Filter Replacement
Every 15,000-25,000 miles
Replace both primary and secondary fuel filters
DEF Filter Replacement
Every 200,000-300,000 miles
Prevents DEF system contamination and injector issues
Valve Adjustment
Every 150,000-200,000 miles
Maintain proper valve lash for optimal performance
DPF Cleaning
Every 200,000-400,000 miles
Professional cleaning extends DPF life and prevents restrictions
Coolant System Service
Every 250,000-300,000 miles
Replace coolant and check for cavitation/corrosion
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.
Serving Sidney, Brookville, Dayton, Piqua, Troy, Bellefontaine, and surrounding areas