Mobile Diesel & Trailer Mechanic II

Cox Fleet is headquartered in Indianapolis and is one of the largest fleet maintenance companies in the country. With a nationwide presence, we provide on‑site mobile maintenance and repair services for light, medium, and heavy‑duty trucks and trailers, as well as support customers through our 50+ service centers. We operate a 24/7 call center and deliver scheduled and unscheduled maintenance for fleets worldwide.

Mobile Diesel Technician Level II – The successful candidate will perform licensed DOT inspections, preventative maintenance, light and follow‑up repairs, mechanical/hydraulic/electrical diagnostics, and other responsibilities under the supervision of a senior technician. The role emphasizes independence, safety compliance, and consistent achievement of 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 various 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 truck equipment across electrical, braking, cooling, air‑conditioning, clutch, differential, and other systems.
• Inspect, test, and analyze defective equipment using handheld computers, pressure gauges and other test instruments.
• Road test vehicles to diagnose malfunctions and confirm proper operation.
• Identify problems, evaluate alternatives, and use sound judgment to determine accurate solutions.
• Independently manage parts inventory, equipment on the company‑issued service truck, and perform periodic reconciliations.
• Maintain and operate the company‑issued service vehicle, conducting safety checks and pre‑/post‑trip inspections.
• Work with and listen effectively to clients and customers to assess needs, provide information, resolve problems, and meet expectations.
• Manage concurrent tasks, prioritizing work‑related activities and time allocations.
• Use hand tools, precision instruments, diesel tools, welding equipment, lifts and jacks.
• Document work according to company standards, uploading pictures of work performed, parts used and findings on Repair Orders (“RO”) via a company‑issued iOS device and the TRAIT application.
• Accurately complete DOT forms and all other required documentation in a timely manner.
• Operate independently, managing one’s daily schedule.
• Maintain a high level of productivity, working within or close to standard repair times.
• Obtain parts from approved local and national vendors as necessary.
• Communicate with management and support teams via email or phone to obtain approvals on repair estimates, retrieve purchase order numbers, and discuss RO findings.
• Perform all work in compliance with organizational safety, health, environmental policies and federal regulations, including OSHA, EPA and DOT.
• Maintain the company issued service truck, conducting safety checks and daily pre‑/post‑trip inspections.

• High School Diploma/GED and 3 years of experience in a related field (or a higher degree or 5 years of experience).
• Possess and supply a set of hand tools necessary for job duties.
• Obtain Automotive Service Excellence (ASE) certification T8 (PMI) within eighteen (18) months.
• Pass a DOT‑regulated pre‑employment background screening, DOT physical or have a valid DOT medical card with more than four (4) months remaining.
• Be at least 21 years old in accordance with interstate operating authority regulations.
• Hold a valid state‑of‑residence driver’s license and maintain a Driver Qualification File.

• ASE T8 (PMI) certification

• ASE T3 (Drivetrain)
• ASE T4 (Brakes)
• ASE T5 (Suspension)
• ASE T6 (Electrical and Electronic Systems)
• ASE T7 (HVAC)
• ASE 608/609

• Understand implications of new information for problem‑solving and decision‑making.
• Lift, bend, climb, stand, walk for long periods and perform moderately heavy labor.
• Exert physically over long periods without tiring, including repetitive tasks.
• Communicate succinctly and…