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Lead 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
    Diesel Mechanic, Heavy Equipment Mechanic
Salary/Wage Range or Industry Benchmark: 60000 - 80000 USD Yearly USD 60000.00 80000.00 YEAR
Job Description & How to Apply Below

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. We also service customers via 50+ nationwide service centers, 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.

We are currently hiring a Lead Mobile Diesel Technician
. The Lead Mobile Diesel Technician will be responsible for performing licensed DOT inspections, preventive maintenance inspections, light and advanced repairs, advanced mechanical/hydraulic/electrical and electronic diagnostics, and other duties as assigned. This role requires mastery in multiple technical disciplines, leadership on jobsites, and strong customer interaction. The Lead will mentor and teach other Technicians in the field and may perform duties of Mobile Technician Manager in their absence.

Responsibilities
  • Perform scheduled preventive 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 Systems, Starters/Alternators, Fan clutches, Engine electronics, Diesel steering systems, Engines (gas and diesel), Transmissions (manual and automatic), Clutches, Differentials, etc.
  • Diagnose, adjust, and repair vehicle systems as above, including electrical, air conditioning, fuel, and engine components.
  • 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 verify proper operation.
  • Identify problems, evaluate information, and generate/assess alternatives with sound judgment.
  • Independently manage parts inventory and equipment on the company-issued service truck; perform periodic reconciliation.
  • Maintain and operate the company-issued service vehicle; conduct safety checks and pre-/post-trip inspections.
  • Interact with clients to assess needs, provide information or assistance, resolve problems, and satisfy expectations.
  • Manage concurrent tasks with effective prioritization of work and time allocations.
  • Use hand tools, precision instruments, Diesel tools, welding equipment, lifts, and jacks.
  • Document work according to company standards and upload RO details, parts used, and findings using an iOS device and TRAIT application.
  • Complete DOT forms and other documentation in a timely fashion.
  • Work independently with a productive daily schedule and achieve outcomes within standard repair times.
  • Obtain parts from approved local and national vendors as needed.
  • Communicate with management to obtain approvals on repair estimates and discuss RO findings.
  • Perform work in compliance with safety, health, and environmental policies and federal regulations (OSHA, EPA, and DOT).
  • Support Mobile Diesel Technicians I/II/Sr in inventory reconciliation and mentor on best practices to meet standard repair times.
  • Assist Mobile Tech Manager (MTM) with Quality Control inspections on work performed by Mobile Diesel Technicians I/II/Sr.
Requirements
  • High School Diploma/GED and 7 years of experience, or related combination including higher-level degree/certification with 5 years of experience, or 9 years in a related field.
  • Possess and supply a set of hand tools necessary to perform required duties.
  • Obtain ASE T8 (PMI) within 18 months.
  • Obtain ASE C1 (Service Consultant) within 18 months.
  • Obtain ASE 608/609 certification within 18 months.
  • Comply with DOT/FMCSA regulations and successfully complete pre-employment DOT screening and DOT physical as required.
  • Current and valid DOT medical card or DOT physical completion as applicable based on validity.
  • Be at least 21 years old due to interstate operating authority requirements.
  • Valid driver’s license and ability to maintain a Driver Qualification File.
Certifications to Obtain Within 18 Months
  • ASE T8 (PMI)
  • ASE 608/609
  • ASE C1 (Service Consultant)
Preferred Certifications
  • ASE T2 (Diesel Engines)
  • ASE T3 (Drivetrain)
  • ASE T4 (Brakes)
  • ASE T5 (Suspension)
  • ASE T6 (Electrical and Electronic Systems)
  • ASE T7 (HVAC)
  • ASE A8 (Engine Performance)
  • ASE L1 (Advanced Engine Performance Specialist)
  • ASE L2 (Electronic Diesel Engine Diagnosis Specialist)
Skills & Abilities
  • Understand implications of new information for current and future problem-solving and decision-making.
  • Ability to lift, bend, climb, stand, and walk for long periods; capable of moderately heavy labor.
  • Physically exert oneself for long periods and perform repetitive tasks.
  • Communicate information succinctly and effectively; maintain two-way communication with individuals and groups.
  • Determine…
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