Powertrain Diagnostic Tech — Heavy-Duty Diesel

Zūm; Jessup (MD); On-site; USD 60,000 - 78,000; Full time

Job summary

Zûm is seeking a skilled fleet technician to diagnose and repair medium/heavy‑duty fleet vehicles, ensuring every bus or vehicle you touch is safe, compliant, and ready to roll. You will diagnose faults across steering, electrical, cooling, braking, drivetrains, and transmissions.

You must have 2–4 years of fleet maintenance experience, strong diagnostic capability plus electrical and A/C proficiency, a valid state driver’s license (CDL preferred), and ASE certifications are a plus.

Qualifications

• 2-4 years of medium/heavy truck fleet maintenance experience.
• Strong diagnostic capability plus electrical and A/C proficiency.
• Deep knowledge of major vehicle systems and diesel equipment.
• Fleet background with both diesel and gasoline systems.
• Personally owned set of recommended minimum hand tools for diesel work.
• Sound judgment and decision-making skills.
• Valid state driver's license; CDL preferred.
• ASE certifications are a plus, not a requirement.

Responsibilities

• Diagnose faults and complete repairs across steering, electrical, cooling, lubrication, braking systems, drivetrains, suspensions, power steering units, clutches, and transmissions.
• Tune, test, and when needed rebuild engines; service oil, temperature, and fuel regulation components.
• Work within your qualification level and adhere to all applicable federal, state, and local requirements.
• Road-test vehicles to confirm issues are fully resolved.
• Secure required inspections and approvals for major repairs before releasing vehicles from the shop.
• Maintain a safe, organized, efficient workspace and ensure it meets all federal, state/provincial, and local regulations.
• Document labor hours, parts usage, and all maintenance/repair actions on the correct forms.
• Perform road calls and complete on-site roadside repairs as assigned.
• Identify additional repair needs and elevate items that require a higher technician qualification.
• Alert the Lead Technician to any unsafe maintenance practices or signs of vehicle abuse.

Skills

Diagnostics

Electrical systems

A/C proficiency

Fleet maintenance

Diesel equipment

Valid driver's license

CDL preferred

Tools

Diesel hand tools

Job description

Zûm is seeking a skilled fleet technician to diagnose and repair medium/heavy‑duty fleet vehicles, ensuring every bus or vehicle you touch is safe, compliant, and ready to roll. You will diagnose faults across steering, electrical, cooling, braking, drivetrains, and transmissions.

You must have 2–4 years of fleet maintenance experience, strong diagnostic capability plus electrical and A/C proficiency, a valid state driver’s license (CDL preferred), and ASE certifications are a plus.