Mobile Diesel Technician - Field Service & Diagnostics

FirstLine Road Solutions; San Jose (CA); On-site; USD 70,000 - 90,000; Full time

Job summary

FirstLine Road Solutions in California is seeking a skilled Mobile Mechanic to diagnose, repair, and perform preventive maintenance on diesel trucks, trailers, and heavy equipment at customer sites or roadside locations.

The ideal candidate has 5+ years of diesel or heavy‑duty experience, strong knowledge of engines, hydraulics and electrical systems, and proficiency with diagnostic tools; CDL preferred and ability to lift 50+ lbs.

Qualifications

• 5+ years’ experience as a diesel technician or heavy-duty mechanic; mobile experience preferred.
• Strong knowledge of diesel engines, hydraulics and electrical systems.
• Valid driver’s license; CDL preferred; ability to lift 50+ lbs and work in all weather.

Responsibilities

• Perform diagnostic inspections and repairs on Class 6–8 trucks, trailers, and heavy equipment at job sites or roadside.
• Service and repair engines, transmissions, drivetrains, brakes, hydraulics, air systems, electrical systems, suspensions, and DEF systems.
• Conduct DOT inspections and ensure repairs meet FMCSA and OEM standards.
• Troubleshoot using diagnostic software (e.g., Cummins Insite, Detroit, CAT ET, Bendix ACom).
• Maintain organized service truck and accurate records of all work performed.
• Communicate effectively with dispatch and customers on estimated repair times and cost.
• Uphold safety standards and adhere to OSHA and DOT regulations.
• Provide excellent customer service and represent the company professionally in the field.
• All other duties assigned by Supervisor

Skills

Heavy-duty systems

Diagnostic tools

Customer communication

Time management

Education

High school diploma; ASE certification preferred

Tools

Cummins Insite

Detroit Diesel ET

CAT ET

Bendix ACom

Job description

FirstLine Road Solutions in California is seeking a skilled Mobile Mechanic to diagnose, repair, and perform preventive maintenance on diesel trucks, trailers, and heavy equipment at customer sites or roadside locations.

The ideal candidate has 5+ years of diesel or heavy‑duty experience, strong knowledge of engines, hydraulics and electrical systems, and proficiency with diagnostic tools; CDL preferred and ability to lift 50+ lbs.