Diesel Mechanic

Paylocity; Leesburg (VA); On-site; USD 55,000 - 85,000; Full time

Job summary

Paylocity in Leesburg, VA is seeking a Diesel Mechanic to diagnose, repair, and maintain diesel-powered commercial vehicles and towing equipment. You will use diagnostic software, engine codes, and repair tools, performing preventive maintenance and field service as needed.

The role emphasizes safety, quality workmanship, and timely repairs in shop and on-road settings. Ideal candidates have 2+ years in diesel mechanics, strong troubleshooting skills, and the ability to read manuals and repair

Qualifications

• High school diploma or GED preferred.
• Possess or be eligible for DCJS certification if required.
• Minimum 2 years of diesel mechanic experience; towing/heavy-duty repair preferred.
• Strong knowledge of diesel engines, transmissions, brakes, suspensions, steering, fuel and DEF systems.
• Proficient in diagnosing and troubleshooting mechanical, electrical, and electronic vehicle systems.

Responsibilities

• Diagnose, troubleshoot, repair, and maintain diesel trucks and commercial vehicles.
• Perform preventive maintenance such as oil changes, brake inspections, alignments, and wheel balancing.
• Complete welding, fabrication, hydraulic repairs, and other mechanical work as needed.
• Ensure repairs are completed accurately and efficiently while meeting productivity standards.
• Maintain documentation and ensure vehicles pass safety inspections.
• Respond to roadside service calls and adhere to safety and DOT regulations.

Skills

Diesel mechanics

Diagnostics

Teamwork

Safety compliance

Customer service

Reliability

Education

High school diploma or GED

DCJS certification (if required)

Tools

Diagnostic software

Engine code readers

Fleet management systems

Welding/fabrication tools

Job description

Description

POSITION SUMMARY

Perform mechanical repairs on commercial vehicles using technical expertise, diagnostic skills, and teamwork. Deliver professional, timely, and safe service to customers while maintaining a clean work area, completing accurate documentation, and following company procedures. Demonstrate professionalism, dependability, safety, and quality in all aspects of the job. Be safe and take pride in your work!

ESSENTIAL FUNCTIONS

Mechanical Diagnostics & Repairs

• Diagnose, troubleshoot, repair, and maintain diesel trucks and commercial vehicles, including engines, transmissions, brakes, suspensions, steering, fuel, air, and DEF systems.
• Perform preventive maintenance services such as oil changes, brake inspections, wheel balancing, and alignments.
• Complete welding, fabrication, hydraulic repairs, clutch replacements, lighting repairs, and other mechanical work as needed.
• Complete repairs accurately and efficiently while meeting company productivity standards.
• Maintain a high first-time repair success rate and minimize repeat repairs.
• Ensure all vehicles pass operational and safety inspections before release. Test drive vehicle to gauge performance.

Technical Knowledge & Problem Solving

• Utilize diagnostic software, engine code readers, and computer systems to identify and resolve mechanical issues.
• Apply mechanical knowledge, mathematical skills, and sound judgment to evaluate repair needs and determine corrective actions.
• Accurately diagnose vehicle failures and recommend appropriate repairs.
• Complete repair documentation with minimal errors.
• Demonstrate current knowledge of diesel engine technology and industry best practices.

Customer Service & Professionalism

• Provide professional, courteous service while communicating repair findings, timelines, and recommendations clearly.
• Maintain a professional appearance and represent the company positively during shop and roadside interactions.
• Maintain positive customer feedback and professional interactions.
• Respond to customer and team inquiries promptly and respectfully.
• Consistently adhere to company appearance and conduct standards.

Dependability & Teamwork

• Report to work on time and ready for duty; attend meetings, training sessions, and safety briefings as required.
• Collaborate effectively with coworkers, dispatch, and management to support efficient operations.
• Maintain acceptable attendance and punctuality standards.
• Complete assigned work orders within established timeframes.
• Demonstrate reliability in fulfilling commitments and job responsibilities.

Roadside Service & Emergency Response

• Respond to roadside breakdowns and emergency service calls to diagnose and repair equipment in the field when possible.
• Meet company response-time expectations for service calls.
• Safely restore vehicles to operation or determine next repair steps.
• Maintain accurate field service records and repair reports.

Safety & Compliance

• Follow all company safety procedures, DOT requirements, and shop policies.
• Maintain a clean, organized work area and use tools and equipment safely.
• Maintain a safe work environment with no preventable safety violations.
• Consistently comply with company, OSHA, and DOT regulations.
• Complete required documentation accurately and on time.

COMPETENCIES

Skilled diesel mechanic with expertise in diagnosing, repairing, and maintaining commercial vehicles and equipment. Demonstrates strong mechanical aptitude, troubleshooting ability, and proficiency with diagnostic software, engine codes, and repair tools. Committed to delivering safe, high-quality workmanship while responding effectively to roadside emergencies and time-sensitive repairs. Exhibits professionalism, dependability, sound judgment, and strong customer service skills through clear communication, teamwork, and a commitment to company standards. Maintains compliance with safety regulations and continuously applies industry knowledge to maximize vehicle performance, reliability, and customer satisfaction.

Requirements

QUALIFICATIONS

Minimum Qualifications

• High school diploma or GED preferred.
• Possess or be eligible to apply for a DCJS certification, if required.
• Minimum of 2 years of diesel mechanic experience; towing or heavy-duty truck repair experience preferred.
• Strong knowledge of diesel engines, preferably Cummins, transmissions, brakes, suspensions, steering, fuel systems, air systems, A/C, tires, hydraulic systems, and DEF systems.
• Proficiency in diagnosing and troubleshooting mechanical, electrical, and electronic vehicle systems using diagnostic software and tools.
• Ability to read and interpret repair manuals, technical documents, schematics, and work orders.
• Basic computer skills with the ability to use diagnostic and fleet management systems.
• Welding and fabrication experience preferred.
• Ability to perform roadside and emergency repairs in various weather and field conditions.
• Must possess and maintain a complete set of tools necessary to perform assigned duties.
• Strong problem-solving, decision-making, and critical-thinking skills.
• Ability to work independently while maintaining effective communication and teamwork.
• Excellent customer service and professional communication skills.
• Demonstrated commitment to safety, quality workmanship, and company standards.
• Valid driver's license required; CDL preferred or ability to obtain one, if required.
• Ability to lift, carry, push, and pull up to 75 pounds and perform physical tasks including standing, bending, kneeling, climbing, and working in confined spaces.
• Reliable attendance, punctuality, and flexibility to work overtime, weekends, on-call shifts, or emergency response assignments as needed.

PHYSICAL REQUIREMENTS

The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this job. Reasonable accommodation may be made to enable individuals with disabilities to perform the essential functions.

While performing the duties of this job, the employee is regularly required to use hands to fingers, handle or feel and talk to or hear. The employee is frequently required to stand; walk; reach with hands and arms and stoop, kneel, crouch or crawl. The employee must be able to perform significant amount of driving, bending, lifting, twisting, climb or lance, and listen to and respond to radio and telephone communications.

This job requires the FULL USE OF the following body parts AT ALL TIME:

Both hands

Both arms

Both eyes

The back

Both legs

Both Knees

Both hips

While performing the duties of this job, the employee is regularly exposed to moving mechanical parts. The employee is infrequently exposed to outside weather conditions. The employee is occasionally exposed to fumes. The noise level in the work environment is usually moderate.

WORK ENVIRONMENT

The Diesel Mechanic works in both shop and field environments, performing maintenance and repairs on commercial trucks, heavy-duty vehicles, and towing equipment. Work is performed indoors and outdoors in varying weather conditions, including extreme heat, cold, rain, and humidity. The position requires frequent exposure to moving mechanical parts, diesel fuel, lubricants, hydraulic fluids, fumes, noise, vibration, and other shop-related hazards.

Mechanics regularly operate hand tools, power tools, diagnostic equipment, welding equipment, lifts, jacks, and other repair machinery. The role requires standing for extended periods; walking, bending, kneeling, crouching, reaching, climbing, and working in confined spaces; and lifting or moving heavy equipment and vehicle components.

This position may require responding to roadside breakdowns and emergency service calls at various locations, often under time-sensitive conditions and in active traffic environments. Employees must consistently follow safety procedures, wear required personal protective equipment (PPE), and maintain a clean and organized work area.

Work Environment Expectations:

• Work in shop, yard, and roadside service settings.
• Exposure to varying weather, noise levels, dust, fumes, and mechanical hazards.
• Frequent lifting, carrying, pushing, and pulling of up to 75 pounds.
• Ability to work flexible schedules, including overtime, weekends, holidays, and on-call assignments as business needs require.
• Adherence to all company safety policies, OSHA requirements, and DOT regulations.
• Commitment to maintaining a safe, professional, and customer-focused work environment.

PERFORMANCE EXPECTATIONS

• Diagnose, troubleshoot, repair, and maintain diesel-powered commercial vehicles and towing equipment.
• Complete repairs accurately, safely, and efficiently while meeting quality standards.
• Maintain a high first-time repair rate and minimize repeat repairs.
• Perform preventive maintenance and inspections according to company standards.
• Respond promptly to roadside service and emergency breakdown calls.
• Complete work orders, inspection reports, and repair documentation accurately and on time.
• Follow all company standards and policies, including work punctuality and attendance.