Field Mobile Diesel Diagnostics Technician - Heavy-Duty

Transwest Mobile Truck & Trailer; Fontana (CA); On-site; USD 75,000 - 110,000; Full time

Benefits offered by this job

Health insurance

Vision insurance

Dental insurance

401(k)

HSA match

Life insurance

Disability insurance

Paid time off

Referral bonus

Overtime opportunities

On-the-job training

Boot allowance

Uniforms provided

Company vehicle

Job summary

Transwest Mobile Truck & Trailer is seeking an experienced Mobile Diesel Technician to diagnose and repair heavy‑duty diesel engines, hydraulics, and electrical systems at customer sites. You will use advanced diagnostic tools and document all work clearly.

This field role includes lifting, driving a company vehicle, and performing on-site repairs across CA. Applicants should have 5+ years hands-on experience, ASE or OEM training preferred, and a strong ability to work under pressure in a

Qualifications

• High school diploma or GED.
• 5+ years hands-on with diesel powertrains, hydraulics, or electrical systems.
• Proficiency with modern diagnostic tooling and service literature.
• Ability to troubleshoot under pressure in fast-paced field environments.
• Own professional tool set for the role.
• Valid driver’s license; comfortable operating a company vehicle.
• Ability to pass background checks.
• Ability to lift 50+ pounds and work indoors/outdoors.
• Field service/mobile repair experience with ASE/OEM training preferred.

Responsibilities

• Perform advanced service and repairs on heavy-duty diesel engines, hydraulic and electrical systems on-site and on schedule.
• Diagnose complex issues using diagnostic tools and OEM service manuals.
• Handle planned maintenance and emergency field repairs with minimal supervision.
• Mentor entry-level technicians and collaborate with peers to improve service quality.
• Document all work thoroughly and accurately.

Skills

diesel powertrains

hydraulics

electrical systems

diagnostic tooling

troubleshooting

tool set

prioritization

driving

background checks

Education

High school diploma or GED

ASE certifications

OEM training

Tools

Diagnostic tools

Job description

Transwest Mobile Truck & Trailer is seeking an experienced Mobile Diesel Technician to diagnose and repair heavy‑duty diesel engines, hydraulics, and electrical systems at customer sites. You will use advanced diagnostic tools and document all work clearly.

This field role includes lifting, driving a company vehicle, and performing on-site repairs across CA. Applicants should have 5+ years hands-on experience, ASE or OEM training preferred, and a strong ability to work under pressure in a