Medium​/Heavy Truck Diagnostic Technician (Chassis, Hydraulics & Electrical

Position: Medium/Heavy Truck Diagnostic Technician (Chassis, Hydraulics & Electrical)
Own the Diagnosis. Elevate the Fix.

Custom Truck One Source (CTOS) supports essential industries with purpose-built trucks and equipment—and we need a diagnostics-driven technician who thrives on complex problems and clean solutions. Grow your career through our STEP Technician Training Program while working on diverse platforms that keep communities powered and connected.

Your impact

Lead end-to-end troubleshooting across diesel engines, drive trains, hydraulics, electrical systems, and truck-mounted utility equipment

Execute preventative maintenance and compliance inspections with attention to detail

Operate diagnostic software and scan tools to pinpoint, validate, and document faults

Service boom/bucket trucks, digger derricks, dump and service trucks, forestry units, and aerial devices

Produce precise repair documentation, submit work orders for approval, and ensure cost accuracy

Champion safe work practices and participate in monthly safety meetings

Support team objectives with additional duties as needed

Bring these competencies

Advanced diesel engine diagnostics and repair (mechanical and electrical)
Preventative maintenance discipline and thorough visual assessments

Proficiency with scan tools and software; strong data and fault-code interpretation

Working command of diesel engines, drivetrain, hydraulics, and electrical circuits

Technical stack

Cummins INSITEDetroit Diesel Diagnostic Link (DDDL)
OEM and aftermarket diagnostic tools

Electrical and hydraulic troubleshooting methodologies

Minimum profile5+ years as a Service Technician / Diesel Mechanic on medium- and heavy-duty trucks

High school diploma or equivalent

Experience across diesel, medium/heavy trucks, or adjacent sectors (construction, agriculture, military)
Mechanical aptitude spanning hydraulics, electrical, and heavy equipment

Basic computer skills for documenting repair activity

Valid driver’s license and the ability to furnish your own tools

Preferred

Vocational/Technical schooling or Military Wheeled Mechanic background3+ years repairing utility trucks or heavy equipmentCDL Class A or BSchedule and physical requirements

Monday–Friday day shift; overtime as needed (occasional Saturdays)
Lift and move tools/equipment as required

Frequent bending, stooping, kneeling, standing

High manual dexterity

Compensation and benefits

Competitive pay based on experience

Health benefits
401(k) with company match

Paid time off (up to 25 days)
Tool discount programSTEP Technician Training Program and advancement opportunities

Proficiency areas

Heavy Equipment Repair Motor Replacement/Repair/Maintenance Diesel Engine Systems Engine Repair Light Vehicle Diesel Engines Lift Truck Repair & Maintenance Ground Support Equipment (GSE) Maintenance Diesel & Heavy Equipment Systems Hydraulic Systems & Components Electrical Systems & Diagnostics (Heavy Equipment)
Equipment Diagnostics & Troubleshooting Power Take-Off (PTO) & Auxiliary Systems Crane & Lifting Equipment Systems Aerial & Utility Equipment SystemsDOT & Equipment Inspection Compliance Compliance Custom  Truck One Source is an Equal Opportunity Employer and provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state, or local laws.

Please note that we do not offer sponsorship for work authorization. Only candidates authorized to work in United States without the need for sponsorship will be considered for this position.
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