Diesel Technician (CNG & Road Service Technician)

Gabrielli Truck Sales Ltd.; South Brunswick (NJ); Hybrid; USD 28,000 - 76,000; Full time

Job summary

Gabrielli Truck Sales in Dayton, NJ is seeking an experienced Diesel Technician with CNG experience to diagnose, repair, and maintain medium- and heavy-duty trucks both in shop and at customer locations.

The role requires strong diagnostic skills, safety focus, and commitment to excellent customer service while minimizing downtime. Road service and on-site repairs are a key part of the job, with opportunities for ongoing training.

Qualifications

• High school diploma or GED required.
• Minimum of 3 years of diesel repair experience on medium- or heavy-duty trucks.
• Previous CNG vehicle repair experience required.
• Road service/mobile technician experience preferred.
• Experience with Mack, Volvo, Ford, Hino, Isuzu, or other commercial truck brands preferred.

Responsibilities

• Diagnose, troubleshoot, and repair diesel-powered medium- and heavy-duty trucks.
• Perform preventative maintenance services according to manufacturer and company standards.
• Diagnose and repair engine, transmission, drivetrain, suspension, steering, brake, electrical, HVAC, hydraulic, and emission systems.
• Perform repairs and maintenance on CNG fuel systems following safety regulations and manufacturer guidelines.
• Respond to customer locations for roadside service calls and mobile repairs.
• Communicate repair status and recommendations to customers and service advisors.
• Complete electronic repair orders, inspections, and warranty documentation accurately.

Skills

Diesel repair

CNG repair experience

Road service experience

Education

High school diploma or GED

Tools

Diagnostic software

Electronic diagnostic equipment

Job description

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

Dayton, NJ, US

Salary Range: $20.00 To $55.00 Hourly

Position Summary

Gabrielli Truck Sales is seeking an experienced Diesel Technician with Compressed Natural Gas (CNG) experience and the ability to perform road service repairs. This position is responsible for diagnosing, repairing, and maintaining medium- and heavy-duty commercial trucks both in the shop and at customer locations. The ideal candidate is safety-focused, self-motivated, and committed to delivering exceptional customer service while minimizing vehicle downtime.

• Diagnose, troubleshoot, and repair diesel-powered medium- and heavy-duty trucks, including Mack, Volvo, Ford, Hino, Isuzu, and other commercial vehicles.
• Perform preventative maintenance services according to manufacturer and company standards.
• Diagnose and repair engine, transmission, drivetrain, suspension, steering, brake, electrical, HVAC, hydraulic, and emission systems.
• Perform repairs and maintenance on Compressed Natural Gas (CNG) fuel systems while following all applicable safety regulations and manufacturer guidelines.
• Conduct inspections and repairs on CNG tanks, fuel lines, regulators, valves, and related components.
• Respond to customer locations for roadside service calls, emergency breakdowns, and mobile repairs.
• Operate a company road service vehicle safely and professionally.
• Accurately diagnose vehicle issues in the field and perform repairs to return equipment to service whenever possible.
• Communicate repair status, recommendations, and estimated completion times with customers and service advisors.
• Complete electronic repair orders, inspections, and warranty documentation accurately and on time.
• Utilize manufacturer diagnostic software, service manuals, and electronic diagnostic equipment.
• Maintain a clean, organized, and safe work environment.
• Follow all OSHA, DOT, EPA, and company safety policies and procedures.
• Participate in ongoing manufacturer and company training programs.
• Assist other technicians as needed and support overall shop productivity.

Qualifications

• High school diploma or GED required.
• Minimum of 3 years of diesel repair experience on medium- or heavy-duty trucks.
• Previous CNG vehicle repair experience required.
• Previous road service/mobile technician experience preferred.
• Experience with Mack, Volvo, Ford, Hino, Isuzu, or other commercial truck brands is preferred.
• Strong understanding of diesel engines, electrical systems, aftertreatment systems, and diagnostics.
• Ability to read wiring diagrams, service manuals, and repair procedures.
• Strong troubleshooting and problem-solving skills.
• Excellent customer service and communication skills.
• Ability to work independently with minimal supervision.

Preferred Certifications

• ASE Medium/Heavy Truck Certifications
• CNG Fuel System Certification
• EPA Section 609 Certification (preferred)

License Requirements

• Valid driver's license with a clean driving record.
• CDL Class A or B preferred or the ability to obtain one.
• Ability to meet company driving requirements for operating road service vehicles.

Physical Requirements

• Frequently lift up to 75 pounds.
• Ability to stand, kneel, bend, crawl, climb, and work in confined spaces.
• Ability to work indoors and outdoors in varying weather conditions.
• Ability to respond to roadside service calls during scheduled shifts and participate in an on-call rotation if required.

Why Join Gabrielli Truck Sales?

Gabrielli Truck Sales has been a trusted name in the commercial truck industry for decades. We invest in our employees through ongoing manufacturer training, state-of-the‑art diagnostic equipment, and opportunities for career advancement. Our technicians are an essential part of delivering the exceptional service our customers expect.

Gabrielli Truck Sales is an Equal Opportunity Employer. We value a diverse and inclusive working atmosphere. In furtherance of our culture, all qualified applicants will receive consideration for employment without regard to pregnancy, race, national origin, gender, age, religion, disability, sexual orientation, veteran status, marital status or any other characteristics protected by law. Gabrielli Truck Sales provides reasonable accommodations for employees and applicants with disabilities or pregnant consistent with applicable law. If you need a reasonable accommodation during the application process, please let us know.