On-Site Diesel Fleet Technician — Diagnostics & Repairs

W.W.Williams; Auburn (WA); On-site; USD 65,000 - 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 is seeking an on-site Mobile Fleet Technician to perform preventive maintenance, diagnostics, and repairs on diesel engines and heavy‑duty trucks at customer locations. You will follow manufacturer specs, complete DOT inspections, and maintain accurate service records.

The role requires 3+ years of diesel repair experience, ASE T4/T7/T8, MACS 609 or equivalent, and strong diagnostic skills. Expect a second‑shift schedule, physical work, and safety compliance.

Qualifications

• 3+ years of diesel repair experience; 5–7 years preferred in fleet, dealership, or mobile technician environments.
• Certificate from a technical school or equivalent hands‑on experience.
• Valid Driver’s License
• 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).
• Familiarity with repair planning and parts reuse.
• 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 engine repair

Diagnostics

Electrical systems

HVAC systems

DOT compliance

Customer service

Communication

Repair planning

Tool inventory

Microsoft Office

Diagnostic software

Education

Technical school certificate or equivalent hands-on experience

ASE Certifications: T4 (Brakes), T7 (HVAC), T8 (PM)

MACS 609 or equivalent mobile A/C certification

DOT Medical Card

Tools

Diagnostic software

MS Office

Job description

W.W. Williams is seeking an on-site Mobile Fleet Technician to perform preventive maintenance, diagnostics, and repairs on diesel engines and heavy‑duty trucks at customer locations. You will follow manufacturer specs, complete DOT inspections, and maintain accurate service records.

The role requires 3+ years of diesel repair experience, ASE T4/T7/T8, MACS 609 or equivalent, and strong diagnostic skills. Expect a second‑shift schedule, physical work, and safety compliance.