Senior Diesel Mechanic – Heavy-Duty Truck Diagnostics

Saia Inc.; Phoenix (AZ); On-site; USD 93,699,000 - 107,310,000; Full time

Job summary

Saia Inc. in Phoenix, AZ, is seeking a skilled diesel mechanic to perform maintenance, repair and diagnostics on Class 6–8 trucks.

You will diagnose failures, perform repairs, and support safety inspections to ensure reliable operation and regulatory compliance. 18+ years, high school diploma or GED, and U.S. work authorization required. Preferred candidates have 2 years of diesel experience and diagnostic software proficiency.

Qualifications

• Must be at least 18 years old.
• High school diploma or GED required.
• Authorized to work in the United States.
• Must provide and maintain personal maintenance tools.
• Read, write, and understand English for communications, instructions, and records.

Responsibilities

• Repairs and maintains systems and parts on class 6, 7, and 8 powered tractors.
• Diagnoses failures and repairs mechanical, electrical, and systems.
• Uses hydraulic jacks to access underneath vehicles.
• Assists in replacements of engines, transmissions, differentials, and springs.
• Troubleshoots repairs of heavy-duty truck engines, braking, electrical, and exhaust systems.
• Documents repairs, inspections, and maintenance tasks.
• Collaborates with partners for training and assistance on complex repairs.
• Tests vehicles after repairs to ensure proper function.

Skills

Diesel mechanic

Diagnostic software

Education

High school diploma or GED

Tools

Tools provided

Job description

Saia Inc. in Phoenix, AZ, is seeking a skilled diesel mechanic to perform maintenance, repair and diagnostics on Class 6–8 trucks.

You will diagnose failures, perform repairs, and support safety inspections to ensure reliable operation and regulatory compliance. 18+ years, high school diploma or GED, and U.S. work authorization required. Preferred candidates have 2 years of diesel experience and diagnostic software proficiency.