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Sr Mobile Diesel Mechanic

Job in Modesto, Stanislaus County, California, 95351, USA
Listing for: Fleet Services by Cox Automotive
Full Time position
Listed on 2026-01-02
Job specializations:
  • Trades / Skilled Labor
    Heavy Equipment Mechanic, Diesel Mechanic
Job Description & How to Apply Below

Sr Mobile Diesel Mechanic

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Veterans encouraged to apply.

Fleet Services – A Cox Automotive Company keeps your fleet moving! Headquartered in Indianapolis, Fleet Services by Cox Automotive has grown to become one of the largest fleet maintenance companies in the country.

Fleet Services 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 using our 50+ nationwide service centers, each offering accident repair, painting, refurbishment, and heavy mechanical repair. With a 24/7 in‑house call center, we provide scheduled maintenance services and unscheduled services to fleets anywhere, anytime.

Position Overview

We are currently hiring a Sr. Mobile Diesel Technician who 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. The Sr. Mobile Diesel Technician is heavily relied upon for advanced diagnostics and triage of complicated repairs by Mobile Diesel Technician I/II, is considered the lead on jobsites by customers and technicians, and 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.

Responsibilities
  • 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 types of 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 various types of truck equipment, using test instruments such as handheld computers and pressure gauges.
  • Inspect, test, and listen to defective equipment to diagnose malfunctions.
  • Road‑test vehicles to diagnose malfunctions and ensure proper operation.
  • Identify problems, determine accuracy and relevance of information, and generate and evaluate alternatives using sound judgment.
  • Independently manage parts inventory and equipment provided on a company‑issued service truck, performing periodic reconciliation.
  • 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 their needs, provide information or assistance, resolve problems, or satisfy expectations.
  • Manage concurrent assigned tasks, prioritizing work‐related activities and time allocations.
  • Use hand tools, precision instruments, 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 a company‑issued iOS device and proprietary TRAIT application.
  • Accurately complete DOT forms and all other documentation in a timely fashion.
  • Work independently and manage a 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.
  • Communicate with management and support team via email or phone to obtain approvals on repair estimates, retrieve purchase order numbers, and discuss RO findings and notes.
  • Perform all work in compliance with safety, health, environmental policies, and federal regulations, including OSHA, EPA, and DOT.
Requirements
  • High School Diploma/GED and 5 years’ experience in a related field. Alternative educational combinations may be accepted, such as a higher degree or certification plus 3 years’ experience, or 7 years’…
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