On-Site Diesel Fleet Technician - Diagnostics & Repairs

W.W.Williams; Rialto (CA); On-site; USD 65,000 - 95,000; Full time

Benefits offered by this job

Paid time off

Health insurance

401k match

Paid holidays

Training programs

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 DOT compliance and uphold repair quality standards while working independently in various conditions.

The role requires 3+ years of diesel repair, ASE certifications, and strong diagnostic skills. You will train others, maintain thorough documentation, and follow safety and EPA policies

Qualifications

• 3+ years of diesel repair experience; 5–7 years preferred.
• Certificate from a technical school 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 components.
• Complete PM services, DOT inspections, and documentation accurately.
• Use diagnostic software and follow electronic repair procedures.
• Maintain a clean, safe work area on customer sites and in the company vehicle.
• Maintain accurate records for invoicing and warranty claims.
• Utilize company tools and maintain a personal tool inventory as required.
• Support and train junior technicians as needed.
• Adhere to safety, EPA, and company policies.

Skills

Diesel repair

Diagnostics

Communication

Microsoft Office

Diagnostic software

Physical endurance

Team training

Electronics diagnostics

Education

Technical certificate

Tools

Diagnostic 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 DOT compliance and uphold repair quality standards while working independently in various conditions.

The role requires 3+ years of diesel repair, ASE certifications, and strong diagnostic skills. You will train others, maintain thorough documentation, and follow safety and EPA policies