Mobile Diesel Fleet Technician – Field Service Pro

El Pollo Loco, Inc.; Phoenix (AZ); On-site; USD 60,000 - 85,000; Full time

Benefits offered by this job

8 Paid Holidays

Paid time off

Employee Referral Bonus Program

Medical, Dental, and Vision Insurance

401k with Company Match

Company Paid Training

Growth and Leadership Opportunities

Job summary

W.W. Williams is seeking a Mobile Fleet Technician to perform on-site preventive maintenance, inspections, diagnostics, and repairs on diesel engines and heavy-duty trucks at customer locations. You will ensure compliance with DOT standards and repair quality expectations.

The role requires 3+ years in diesel repair, ASE certifications, and strong diagnostic skills. Must be able to work second shift and weekends, with a customer-first mindset and ability to work independently in varied

Qualifications

• 3+ years of diesel repair experience; 5–7 years preferred in fleet, dealership, or mobile tech 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).
• 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 specs.
• Conduct thorough vehicle inspections to identify damaged, worn, or broken parts.
• Create and execute repair plans based on diagnostics, including labor hours and parts.
• Diagnose and repair electrical systems, A/C, emissions controls and other diesel components.
• Complete PM services, DOT inspections, and documentation accurately.
• Use diagnostic software and follow electronic repair procedures.
• Maintain a clean, safe work area on site and in the company vehicle.
• Maintain records for invoicing and warranty claims.
• Utilize company tools and maintain personal tool inventory as policy dictates.
• Support and train junior technicians as needed.
• Adhere to safety, EPA, and company policies.

Skills

Diesel engine repair

Fleet maintenance

Diagnostics

Safety compliance

Customer service

Electronic diagnostics

Education

Technical school certificate

Tools

Diagnostic software

MS Office

DOT compliance software

Job description

W.W. Williams is seeking a Mobile Fleet Technician to perform on-site preventive maintenance, inspections, diagnostics, and repairs on diesel engines and heavy-duty trucks at customer locations. You will ensure compliance with DOT standards and repair quality expectations.

The role requires 3+ years in diesel repair, ASE certifications, and strong diagnostic skills. Must be able to work second shift and weekends, with a customer-first mindset and ability to work independently in varied