Mobile Diesel Fleet Tech: Diagnostics, PMs & Repairs

W.W.Williams; Commerce City (CO); On-site; USD 70,000 - 90,000; Full time

Benefits offered by this job

8 Paid Holidays & 1 Paid Wellness Day

Paid time off

Employee Referral Bonus Program

Medical, Dental, and Vision Insurance

401k with a Company Match

Company Paid Training

Growth and Leadership Opportunities

Job summary

W.W. Williams in Colorado seeks a Mobile Fleet Technician to perform on-site preventive maintenance, diagnostics and repairs on diesel engines and heavy-duty trucks at customer locations.

This role requires 3+ years of diesel repair experience, ASE certifications, a valid CDL, and strong diagnostic skills; you will work off-site at times, train junior technicians, and ensure DOT compliance.

Qualifications

• 3+ years of diesel repair experience; 5–7 years preferred in fleet, dealership, or mobile technician environments.
• Technical school certificate or equivalent hands-on experience.
• Valid Driver’s License and DOT Medical Card (or ability to obtain).
• ASE Certifications: T4 (Brakes), T7 (HVAC), T8 (PM).
• MACS 609 or equivalent mobile A/C certification.
• Strong diagnostic and troubleshooting skills across multiple systems (brake, emissions, electrical, HVAC).
• Proficient in Microsoft Office and diagnostic software.
• Clear written and verbal communication.
• Ability to work in physically demanding environments.

Responsibilities

• Perform quality repairs and preventive maintenance on diesel engines and heavy-duty trucks per manufacturer specifications.
• Conduct thorough vehicle inspections to identify damaged, worn, or broken parts.
• Create and execute job repair plans based on diagnostics, including estimating labor hours and required parts.
• Diagnose and repair electrical systems, A/C systems, emissions controls, and other diesel engine components.
• Complete PM services, DOT inspections, and documentation accurately and thoroughly.
• Use diagnostic software and follow electronic repair procedures.
• Maintain a clean and safe work area, both on customer sites and in the company vehicle.
• Maintain accurate records for invoicing and warranty claims.
• Utilize company tools appropriately and maintain a personal tool inventory per company policy.
• Support and train junior technicians as needed.
• Adhere to all safety, EPA, and company policies.

Skills

Diesel repair

Diagnostics

Communication

Physical stamina

Microsoft Office

Education

Technical school certificate

Tools

Diagnostic software

Microsoft Office

Job description

W.W. Williams in Colorado seeks a Mobile Fleet Technician to perform on-site preventive maintenance, diagnostics and repairs on diesel engines and heavy-duty trucks at customer locations.

This role requires 3+ years of diesel repair experience, ASE certifications, a valid CDL, and strong diagnostic skills; you will work off-site at times, train junior technicians, and ensure DOT compliance.