About The Position

Cox Fleet is hiring a Senior Mobile Diesel and Trailer Technician to provide on-site maintenance and repair services for light-, medium-, and heavy-duty vehicles and trailers. The role performs DOT and preventative maintenance inspections, repairs ranging from minor adjustments to advanced mechanical, hydraulic, electrical, and electronic diagnostics, and related duties. The technician is relied upon to diagnose and triage complex repairs for Mobile Diesel Technician I/II and is considered the lead at job sites by customers and technicians, serving as a consultant on the customer's behalf. The position requires compliance with company policies and achievement of performance metrics. The technician works in a mobile/field environment, independently manages a daily schedule and assigned tasks, and maintains the company-issued service vehicle, its equipment, and parts inventory. Work includes documenting repairs and findings using a company-issued iOS device and the TRAIT application, completing DOT forms, communicating with customers and company support, and complying with safety, health, environmental, and applicable federal regulations.

Requirements

  • High school diploma or GED and three years of experience in a related field; alternatively, a different combination such as a related degree or certification beyond high school/GED, or five years of related experience.
  • At least three years of experience with refrigerated equipment.
  • Possess and supply the hand tools necessary to perform the job duties.
  • Participate in and complete all company-required training.
  • Successfully complete and pass a DOT-regulated pre-employment background screening and DOT physical before employment; a current DOT medical card with more than four months remaining may be submitted in lieu of a DOT physical.
  • Be at least 21 years old due to interstate operating authority commerce regulations.
  • Have a valid driver’s license from the state of residence and be able to obtain and maintain a Driver Qualification File.
  • Obtain ASE T8 (PMI) certification and ASE 608/609 certification within 18 months.
  • Ability to lift, bend, climb, stand, and walk for long periods and perform moderately heavy labor.
  • Ability to exert oneself physically for extended periods, including performing repetitive tasks.
  • Communicate information succinctly and in an organized manner and engage in effective two-way communication with individuals and groups.
  • Ability to determine the tools and equipment needed.
  • Ability to judge relative distance and depth accurately.
  • Use logic and reasoning to identify strengths and weaknesses of alternative solutions, conclusions, or approaches to problems.
  • Understand how new information affects current and future problem-solving and decision-making.

Nice To Haves

  • OEM training and certifications are preferred.
  • ASE T2 (Diesel Engines) certification.
  • ASE T3 (Drivetrain) certification.
  • ASE T4 (Brakes) certification.
  • ASE T5 (Suspension) certification.
  • ASE T6 (Electrical and Electronic Systems) certification.
  • ASE T7 (HVAC) certification.
  • ASE A8 (Engine Performance) certification.
  • ASE L1 (Advanced Engine Performance Specialist) certification.
  • ASE L2 (Electronic Diesel Engine Diagnosis Specialist) certification.

Responsibilities

  • Perform scheduled preventative maintenance and DOT inspections, and complete follow-up repairs on light-, medium-, and heavy-duty vehicles in a mobile/field environment.
  • Perform minor adjustments and repairs to truck systems and equipment, including electrical, brake, cooling, starting, charging, engine, steering, transmission, clutch, and differential systems.
  • Diagnose, adjust, and repair truck equipment, including air conditioning and other mechanical, electrical, and electronic systems.
  • Inspect, test, and listen to defective equipment to diagnose malfunctions using instruments such as handheld computers and pressure gauges.
  • Road-test vehicles to diagnose malfunctions and verify proper operation.
  • Identify problems and evaluate information and repair alternatives using sound judgment.
  • Independently manage parts inventory and equipment on the company-issued service truck and periodically reconcile inventory.
  • Maintain and operate the company-issued service vehicle, perform safety checks, and complete daily pre- and post-trip inspections.
  • Listen and respond effectively to clients and customers, assess their needs, provide assistance or information, and resolve problems or meet expectations.
  • Manage concurrent tasks and prioritize work and time effectively.
  • Use hand tools, precision instruments, diesel tools, welding equipment, lifts, and jacks.
  • Document work, parts used, and findings on Repair Orders according to company standards, including uploading photographs using the company-issued iOS device and TRAIT application.
  • Complete DOT and other required documentation accurately and on time.
  • Work independently and manage the daily schedule.
  • Maintain productivity and work within or close to Standard Repair Times.
  • Obtain parts from approved local and national vendors as needed.
  • Communicate with management and support teams by email or phone to obtain estimate approvals and purchase order numbers, and discuss Repair Order findings.
  • Perform work in compliance with company safety, health, and environmental policies and federal regulations, including OSHA, EPA, and DOT requirements.

Benefits

  • Weekly pay, with pay every Friday.
  • Safe driving and technician efficiency bonuses.
  • Safety boots and safety glasses reimbursement.
  • Extreme-weather gear for cold and hot conditions.
  • Uniforms provided, with laundry service where available.
  • Company service truck may be taken home daily.
  • Company tablet and cellphone provided.
  • Technical training to support career advancement.
  • Dedicated career path; over 50% of front-line managers are promoted from within.
  • Health, dental, and vision insurance beginning on the first day of employment.
  • 401(k) matching after 90 days: 100% match up to 6% contribution, plus an additional 2% discretionary company contribution.
  • Accrue up to 200 hours (five weeks) of paid time off based on tenure.
  • Tuition assistance or reimbursement.
  • Adoption and surrogacy assistance.
  • Pet insurance.
  • Employee resource groups and diversity groups, and company-paid volunteer hours.
  • Employee discounts on new vehicle purchases, cellphone plans, ridesharing, home and rental insurance, wellness and fitness incentives, and more.
© 2026 Teal Labs, Inc
Privacy PolicyTerms of Service