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Public Transit
MTA New York City Transit, SEPTA, Los Angeles Metro
Bus and Truck Mechanics and Diesel Engine Specialists
These mechanics keep buses, delivery trucks, and other diesel-powered vehicles safe and road-ready by fixing engines, brakes, electrical systems, tires, and suspension parts. The work stands out because diagnosis matters as much as wrench-turning: one bad sensor, wiring fault, or fuel issue can take a vehicle out of service. The tradeoff is steady hands-on work with decent pay, but it is physical, time-sensitive, and increasingly tied to newer fuel systems that demand constant retraining.
Also known as Diesel MechanicDiesel TechnicianHeavy Duty Truck MechanicFleet MechanicTruck Technician
Median Salary
$60,640
Mean $62,480
U.S. Workforce
~287K
26.5K openings per year
10-Year Growth
+2.4%
319.9K to 327.7K
Entry Education
High school diploma or equivalent
+ None experience
What This Role Looks Like in Practice
Bus and Truck Mechanics and Diesel Engine Specialists sits in the Trades category. In practical terms, this role combines day-to-day execution, cross-team coordination, and consistent decision-making under real business constraints.
U.S. employment is currently about ~287K workers, with a median annual pay of $60,640 and roughly 26.5K openings each year. Based on BLS projections, total employment is expected to grow from 319.9 K in 2024 to 327.7K in 2034.
Most hiring paths start with Post-secondary certificate in diesel or heavy vehicle technology, and employers typically expect none of related experience. Many careers in this track begin around Diesel Mechanic Apprentice and can progress toward Lead Technician or Shop Foreman. High-value skills usually include Repairing, Troubleshooting, and Operations Monitoring, paired with soft skills such as Attention to detail, Problem-solving, and Time management.
Core Responsibilities
- Handle routine service jobs like oil changes, battery checks, and lubrication so buses and trucks keep running on schedule.
- Track down engine, ignition, wiring, and dashboard problems and repair the parts that are causing the failure.
- Take vehicles on test drives to confirm a repair worked or to narrow down what is still wrong.
- Fix brake problems, straighten wheels, and tighten or reassemble parts after repairs.
Keep exploring: more Trades careers or browse all job titles.
A Day in the Life
01 Handle routine service jobs like oil changes, battery checks, and lubrication so buses and trucks keep running on schedule.
02 Track down engine, ignition, wiring, and dashboard problems and repair the parts that are causing the failure.
03 Take vehicles on test drives to confirm a repair worked or to narrow down what is still wrong.
04 Fix brake problems, straighten wheels, and tighten or reassemble parts after repairs.
05 Replace worn tires and adjust steering and suspension parts so the vehicle handles correctly.
06 Inspect safety guards and devices, and service vehicles that use biodiesel, hybrid, or compressed natural gas systems.
Industries That Hire
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Freight and Logistics
UPS, FedEx Freight, Schneider
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School Transportation
First Student, Durham School Services, Student Transportation of America
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Municipal Fleet Operations
United States Postal Service, New York City Department of Sanitation, City of Chicago
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Truck Dealerships and Service Centers
Penske Truck Leasing, Rush Truck Centers, TA Truck Service
Pros and Cons
Advantages
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The pay is solid for a trade, with a median wage of $60,640 and a mean of $62,480.
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Demand is steady, with about 26.5 thousand annual openings and 287,230 jobs already in the field.
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You can enter with a high school diploma, and many workers build skills through long-term on-the-job training instead of a four-year degree.
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The work is hands-on and varied, so you are not stuck doing the same task all day.
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Skills with hybrid, biodiesel, and compressed natural gas systems can make you more valuable as fleets update their equipment.
Challenges
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Growth is only 2.4% through 2034, so this is not a fast-expanding field.
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The work is physically demanding, dirty, and often done in cramped spaces under large vehicles.
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Breakdowns create pressure to diagnose problems quickly because every truck or bus out of service costs money and disrupts schedules.
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There is a ceiling in many shops unless you move into lead, foreman, or supervisor roles.
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The long-term shift toward electric and other low-emission vehicles means diesel specialists have to keep retraining to stay relevant.
Career Progression
Diesel Mechanic Apprentice
0-2 years
$34K-$44K
Learns shop procedures, does basic service work, and helps experienced mechanics with inspections, parts removal, and cleanup.
Diesel Mechanic
2-5 years
$45K-$57K
Handles common repairs and maintenance on trucks and buses with less supervision and starts diagnosing more routine problems independently.
Bus and Truck Mechanic and Diesel Engine Specialist THIS ROLE
5-10 years
$58K-$72K
Diagnoses harder engine, brake, suspension, and electrical problems, and keeps commercial vehicles moving on tight schedules.
Lead Technician or Shop Foreman
10+ years
$73K-$90K
Oversees difficult repairs, checks work for quality, helps train newer techs, and may coordinate jobs to reduce vehicle downtime.
Education Paths
Post-secondary certificate in diesel or heavy vehicle technology
The most common route, held by 39.49% of workers in the O*NET distribution.
High school diploma or equivalent plus long-term on-the-job training
A very common entry route, held by 36.89% of workers; BLS also lists a high school diploma as the typical entry level.
Associate degree in diesel or automotive technology
A smaller path, held by 0.67% of workers in the O*NET distribution.
Key Skills
Technical
Repairing 75%
Troubleshooting 75%
Operations Monitoring 63%
Equipment Maintenance 60%
Critical Thinking 56%
Quality Control Analysis 56%
Equipment Selection 53%
Judgment and Decision Making 53%
Soft Skills
Attention to detailProblem-solvingTime managementCommunicationTeamworkSafety awareness Job Outlook and Trends
+2.4%
Projected growth (2024-2034)
26.5K
Annual job openings
Employment is projected to rise from 319.9K to 327.7 K over the next decade, representing 2.4% growth. Around 26.5 K openings per year include both newly created roles and replacement hiring from turnover.
Remote availability is currently Rare. Demand remains strongest where employers need practical domain knowledge plus modern workflow and data skills.