Sr Mobile Diesel Mechanic - M-F

Contact Information

If you have any questions or to connect with a recruiter while your application is being reviewed, please Text DFS3 to  ***.

Veterans encouraged to apply.

Cox Fleet keeps your fleet moving! Headquartered in Indianapolis, Cox Fleet has grown to become one of the largest fleet maintenance companies in the country.

Cox Fleet is the leading provider of on‑site mobile maintenance and repair services nationwide, offering mobile on‑site fleet service for light, medium, and heavy‑duty trucks and trailers. Cox Fleet also services customers utilizing its 50+ nationwide service centers; each offering accident repair, painting, refurbishment, and heavy mechanical repair. We are supported by a 24/7 in‑house call‑center and provide scheduled maintenance services and unscheduled services to fleets anywhere, anytime.

The Sr. Mobile Diesel Technician will be responsible for performing licensed DOT inspections, preventative maintenance inspections, light and advanced repairs, advanced mechanical/hydraulic/electrical and electronic diagnostics, and other duties as assigned. Heavily relied upon for advanced diagnostics and triage of complicated repairs by Mobile Diesel Technician I/II, the role is considered the lead on jobsites by customers and technicians, functioning as a consultant on the customer's behalf.

• 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 adjustment and repairs on various truck equipment: electrical, brake, cooling systems, starters/alternators, fan clutches, engine electronics, diesel steering systems, engines (gas and diesel), transmissions (manual and automatic), clutches, differentiates, etc.
• Diagnose, adjust, and repair truck equipment across similar system groups.
• Inspect, test, and listen to defective equipment to diagnose malfunctions, using test instruments such as handheld computers and pressure gauges.
• Road test vehicles to diagnose malfunctions and ensure they are working properly.
• Identify problems, evaluate alternatives using sound judgment.
• Independently manage parts inventory and equipment on the company‑issued service truck, performing periodic reconciliation.
• Maintain and operate the company‑issued service vehicle, conduct safety checks and pre/post‑trip inspections.
• Work with and listen effectively to clients and customers to assess their needs, providing assistance, resolving problems, or satisfying expectations.
• Manage concurrent assigned tasks, prioritizing work activities and time allocations.
• Use hand tools, precision instruments, diesel tools, welding equipment, lifts, and jacks.
• Document work according to company standards, uploading pictures and details on Repair Orders (RO) via the company‑issued iOS device and the TRAIT application.
• Accurately complete DOT forms and all other required documentation in a timely fashion.
• Work independently, managing own daily schedule.
• Maintain high productivity within or near standard repair times.
• Obtain parts from approved local and national vendors as necessary.
• Communicate with management and support teams via email or phone for repair estimates, purchase order numbers, and RO findings.
• Perform all work in compliance with safety, health, environmental policies, and federal regulations (OSHA, EPA, DOT).
• Maintain the company‑issued service truck with safety checks and daily pre/post‑trip inspections.

• High School Diploma/GED and at least 3 years’ experience in a related field (or other qualifying combinations).
• At least 3 years of experience with refrigerated equipment.
• Possess and supply a set of hand tools necessary for job duties.
• OEM training and certifications are preferred.
• Participate in and complete all company‑required training.
• Pass a DOT‑regulated pre‑employment background screening and DOT physical (or provide a valid DOT medical card with >4 months validity).
• At least 21 years old due to interstate operating authority regulations.
• Valid state‑of‑residence driver’s license and ability to obtain and maintain a Driver Qualification File.