Sr Mobile Diesel Mechanic

About Cox Fleet

Headquartered in Indianapolis, Cox Fleet is one of the largest fleet maintenance companies in the country, providing on‑site mobile maintenance and repair services for light, medium, and heavy‑duty trucks and trailers. The company also serves customers through over 50 nationwide service centers that offer accident repair, painting, refurbishment, and heavy mechanical repair. Cox Fleet is supported by a 24/7 in‑house call center and offers scheduled and unscheduled maintenance services to fleets anywhere, anytime.

We are an Equal Opportunity Employer, including disability and veterans.

Sr. Mobile Diesel Technician

The Sr. Mobile Diesel Technician will perform licensed DOT inspections, preventative maintenance, light and advanced repairs, and advanced mechanical, hydraulic, electrical, and electronic diagnostics in a mobile field environment. The role requires advanced diagnostics, triage of complicated repairs, and leadership on jobsites as a consultant for customers and technicians. Successful technicians meet company policies and high performance metrics.

• Perform scheduled preventative maintenance (“PM”), DOT inspections, and follow‑up repairs on light, medium, and heavy‑duty vehicles in a mobile/field environment.
• Perform minor adjustments and repairs on truck equipment, including electrical, brake, cooling, starters, alternators, fan clutches, engine electronics, diesel steering systems, engines (gas and diesel), transmissions, clutches, and differentials.
• Diagnose, adjust, and repair various truck systems, identifying malfunction causes using diagnostic instruments such as handheld computers and pressure gauges.
• Road‑test vehicles to confirm proper operation after repairs.
• Identify problems, evaluate alternatives, and apply sound judgment in diagnostic and repair decisions.
• Manage parts inventory and equipment on company‑issued service trucks, performing periodic reconciliation.
• Maintain and operate company‑issued service vehicles, including safety checks and pre/post‑trip inspections.
• Communicate effectively with clients to assess needs, provide information, resolve problems, and satisfy expectations.
• Prioritize concurrent tasks and allocate time efficiently.
• Use hand tools, precision instruments, diesel tools, welding equipment, lift‑and‑jacks as required.
• Document work in company standards, upload pictures and parts used on Repair Orders (“RO”) via the TRAIT application on an iOS device.
• Complete DOT and other required documentation in a timely fashion.
• Work independently, managing daily schedule and productivity within or near standard repair times.
• Source parts from approved local and national vendors as needed.
• Communicate with management and support teams via email or phone for repair estimates, purchase orders, and RO notes.
• Perform all work in compliance with safety, health, environmental policies, and federal regulations (OSHA, EPA, DOT).

• High School Diploma or GED with at least 3 years of related experience. Candidates with alternative education or higher degree may be considered.
• At least 3 years of experience with refrigerated equipment.
• Supply a set of hand tools necessary for the duties.
• OEM training and certifications preferred.
• Complete all company‑required training.
• Support DOT regulations; successful completion of DOT‑regulated background screening and DOT physical before employment.
• Valid DOT medical card with more than 4 months remaining or a DOT physical if validity is ≤4 months.
• Minimum age 21 due to interstate operation regulations.
• Valid driver’s license and ability to maintain a Driver Qualification File.

• A.S.E. T8 (PMI) certification
• A.S.E.…