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Sr Mobile Diesel Mechanic

Job in Phoenix, Maricopa County, Arizona, 85003, USA
Listing for: Fleet Services by Cox Automotive
Full Time position
Listed on 2026-03-01
Job specializations:
  • Trades / Skilled Labor
    Heavy Equipment Mechanic, Diesel Mechanic
Salary/Wage Range or Industry Benchmark: 60000 - 80000 USD Yearly USD 60000.00 80000.00 YEAR
Job Description & How to Apply Below

If you have any questions or to connect with a recruiter while your application is being reviewed, please Text DFS2 to .

Equal opportunity Employer – Disabled/Veterans encouraged to Apply.

Cox Fleet Overview

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.

Position:
Sr. Mobile Diesel Technician

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. Considered the lead on jobsites by customers and technicians. Functions as a consultant on the customer's behalf.

A successful Sr. Mobile Diesel Technician complies with all company policies and achieves high‑level performance metrics.

Duties
  • 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 types of truck equipment including electrical, brake, cooling systems, starters, alternators, fan clutches, engine electronics, diesel steering systems, engines (gas and diesel), transmissions, clutches, differentials, etc.
  • Diagnose, adjust, and repair various types of truck equipment including electrical, brake, cooling systems, starters, alternators, air conditioning systems, fan clutches, engine electronics, diesel steering systems, engines (gas and diesel), transmissions, clutches, differentials, etc.
  • 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 proper operation.
  • Identify problems and generate and evaluate alternatives using sound judgment.
  • Independently manage parts inventory and equipment provided on company‑issued service truck and perform periodic reconciliation.
  • Maintain and operate company‑issued service vehicle, conduct safety checks, and perform pre‑ and post‑trip inspections.
  • Work with and listen effectively to clients and customers to assess their needs, provide information or assistance, resolve problems, and satisfy expectations.
  • Manage concurrent assigned tasks and prioritize work-related activities and time allocations.
  • Use hand tools, precision instruments, as well as diesel tools, welding equipment, lifts and jacks.
  • Document according to company standards and upload pictures of work performed, parts used, and all findings observed on Repair Orders (“RO”) using company‑issued iOS device and the proprietary TRAIT application.
  • Accurately complete DOT forms and all other documentation in a timely fashion.
  • Work with a high degree of independence and manage own daily schedule.
  • Maintain a high level of productivity and work within or close to most standard repair times.
  • Obtain parts from approved local and national vendors as necessary for repairs.
  • Communicate with management and support team 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 and environmental policies and federal regulations, including OSHA, EPA, and DOT.
  • Maintain company‑issued service truck, conduct safety checks and daily pre/post trip inspections.
Requirements
  • High School Diploma/GED and 3 years’ experience in a related field. The right candidate could…
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