5.9L CUMMINS • 6.7L CUMMINS
Ram Cummins trucks have earned their reputation as workhorses, but even a Cummins needs the right diagnosis when something goes wrong. Hard starts, low power, fuel pressure concerns, turbocharger problems, emissions warnings, steering issues, and transmission concerns can have several possible causes.
Knox Performance Diesel & Offroad specializes in Cummins diagnostics, maintenance, repair, and performance in Killeen, Texas. We work on 5.9L and 6.7L Cummins-powered Ram trucks, using proper testing to identify the problem before recommending repairs.
From fuel systems and injectors to turbochargers, DEF/DPF/EGR systems, cooling systems, transmissions, oil leaks, electrical concerns, steering and suspension, and major engine repairs, our goal is to find the problem and fix it right.
Check engine lights, hard starts, loss of power, drivability concerns, electrical faults, warning messages, and intermittent problems all start with proper testing. We diagnose the concern before recommending repairs or replacing parts.
From injector and fuel contamination concerns to lift pump failures, low fuel pressure, hard starts, and common rail fuel system issues, we test the system to identify the cause before recommending repairs.
Turbocharger and actuator faults can cause low power, poor towing performance, and check engine lights. We diagnose the root cause before recommending repairs.
Cooling system issues can lead to costly engine damage. We diagnose coolant leaks, water pump failures, radiator concerns, and overheating conditions.
Cummins engines are known for their longevity, but oil leaks can develop over time. We identify the source of the leak and recommend the appropriate repair.
We diagnose and repair DEF, DPF, EGR, SCR, NOx sensor, regeneration, derate, and emissions-related concerns on modern 6.7L Cummins trucks.
From minor repairs to complete engine replacement and rebuild projects, our team can help keep your truck on the road
Ram trucks are known for front-end wear. We diagnose and repair steering, suspension, and handling concerns to help keep your truck driving safely and confidently.
Fuel system upgrades, turbos, injectors, lift pumps, towing upgrades, and supporting modifications built around your goals and intended use
Modern Ram trucks rely on complex electronics and communication systems. We diagnose wiring, sensor, and electrical concerns before replacing parts
Oil changes, fuel filters, transmission services, coolant flushes, differential services, and mileage based maintenance designed to keep your truck reliable.
Whether you're towing, hauling, or daily driving, we diagnose and repair transmission, transfer case, driveline, and drivetrain concerns
Schedule your Cummins diagnostic, repair, or maintenance appointment with Knox Performance Diesel & Offroad in Killeen, Texas.
Knox Performance Diesel and Off Road
126 South Park Street, Killeen, Texas 76541, United States