Bus and Truck Mechanics and Diesel Engine Specialists Salary

The median bus and truck mechanics and diesel engine specialists salary in the United States is $61,770 per year ($29.70/hour). Salaries range from $44,530 at the entry level to $88,740+ for the top 10% of earners. There are 289,960 bus and truck mechanics and diesel engine specialists jobs nationwide. Employment is projected to grow 2.4% through 2034.

Last updated: June 2026 Β· Source: U.S. Bureau of Labor Statistics

Also known asDiesel MechanicTruck Mechanic
Median Salary
$61,770
per year
Hourly Rate
$29.70
per hour
Employment
289,960
jobs in the U.S.

Salary Distribution

10th percentile
$44,530
25th percentile
$50,540
Median
$61,770
75th percentile
$75,470
90th percentile
$88,740

Job Growth (2024-2034)

+2.4%
As fast as average

Annual Openings

26,500
jobs/year (growth + replacements)

Education Required

High school diploma or equivalent

Training Needed

Long-term on-the-job training

Bus and Truck Mechanics and Diesel Engine Specialists Career Guide

Interview questions, resume templates, and a career ladder written specifically for bus and truck mechanics and diesel engine specialistss.

Diesel technicians service Class 7-8 trucks, transit buses, school buses, and heavy equipment. Pay is tight to labor market and shop type: entry techs earn $42-58k, established techs earn $62-92k with overtime, master techs at fleet operations or dealer shops earn $85-125k+, and specialty electrical/hybrid/EV techs at OEM dealer networks reach $95-140k. Certified emissions/aftertreatment techs and diagnostic specialists on the newest Cummins/PACCAR/Detroit engines command a 15-25% premium. Nationwide tech shortage is real β€” mobility between shops is high.

Core Skills Hiring Managers Screen For

Diesel engine diagnosis and repair
Diagnose Cummins X15/ISX, Detroit DD13/DD15/DD16, PACCAR MX-13, Volvo D13. Read fault codes with OEM software (Insite, DiagnosticLink, DAVIE, Premium Tech Tool), interpret live data, and pinpoint root cause vs symptom.
Emissions and aftertreatment systems
DPF regen, DEF/SCR faults, EGR, NOx sensors β€” the #1 source of fleet downtime. Understand the difference between an active regen, a parked regen, and a forced service regen.
Electrical and CAN-bus diagnostics
J1939 bus, module wake-up, no-communication faults, and multiplexed body electrical. A voltmeter and a wiring diagram outdiagnose parts-cannon replacement every time.
Preventive maintenance (PM) inspection
DOT annual inspection, brake stroke, tire tread depth, fifth-wheel wear, air-system leakdown. PM is where fleet techs prevent roadside failures.
Hydraulics and drivetrain
Eaton and Allison transmissions, differentials, PTOs, and hydraulic circuits on refuse and construction equipment. Rebuild vs replace decisions drive shop profitability.
Welding, fabrication, and body repair (heavy)
MIG welding on frame and body work, cutting torch, hydraulic press. Not every diesel tech welds, but shops pay a premium for those who do.
EV / hybrid heavy-duty systems (emerging)
Freightliner eCascadia, Volvo VNR Electric, transit BEB (battery-electric buses). High-voltage safety, battery pack diagnostics, and regen brake systems β€” the fastest-growing specialty.

How to Become a Bus and Truck Mechanics and Diesel Engine Specialists

  1. 1
    Complete a diesel/heavy-duty tech program
    AAS at community college or WyoTech / UTI / Lincoln Tech takes 12-24 months. Fleet-sponsored apprenticeships (UPS, Waste Management, transit authorities) pay while you learn.
  2. 2
    Take a tech-1 or entry job at a dealer or fleet shop
    $42-55k. Dealer shops (Kenworth, Peterbilt, Freightliner, Volvo) pay for training and provide structured advancement. Fleet shops (UPS, FedEx Freight, transit) offer steadier hours and union scale.
  3. 3
    Earn ASE Medium/Heavy Truck certifications (T1-T8)
    Master Medium/Heavy Truck Technician = all 8 tests passed. Each cert typically triggers a $1-3/hr pay bump at dealers.
  4. 4
    Specialize in emissions/aftertreatment, electrical, or EV
    OEM-specific training at Cummins College, Detroit Diesel Academy, PACCAR University. These certifications drive the top pay-band jumps.
  5. 5
    Advance to Lead / Foreman / Service Manager, or move to Mobile Diesel / Field Service
    $85-140k. Mobile diesel techs on-call charge $150-225/hr; roadside/fleet foremen earn foreman pay + shift differential. Service manager path exits the wrench work.

Career Progression

Tech 1 / Apprentice Diesel Technician
0-2 yrs$42-58k
  • β€’Preventive maintenance and DOT inspections
  • β€’Tire, brake, and basic electrical work
  • β€’Assist master techs on major repairs
  • β€’Complete OEM factory training modules
Next: Tech 2 / Journeyman at 2-4 years with ASE T1-T3.
Tech 2 / Journeyman Diesel Technician
2-8 yrs$62-92k + OT
  • β€’Diagnose and repair engines, transmissions, drivelines
  • β€’Own emissions/aftertreatment diagnostic work
  • β€’Read wiring diagrams and troubleshoot electrical faults
  • β€’Mentor apprentices on PM procedures
Next: Master Tech at 6-12 years with ASE Master Truck + OEM certs.
Master Tech / Lead Diagnostic Technician
8-15 yrs$85-125k + OT (top mobile/field service $135k+)
  • β€’Handle the hardest diagnostic tickets in the shop
  • β€’Lead major engine and transmission rebuilds
  • β€’Own OEM warranty documentation and callback resolution
  • β€’Train apprentices, sign off on Tech 1 work
Next: Foreman / Service Advisor at 12-20 years.
Shop Foreman / Service Manager / Field Service Manager
12+ yrs$95-165k (dealer service managers with bonus $135-215k)
  • β€’Shop scheduling, tech assignments, OT approval
  • β€’Warranty processing and OEM relationship management
  • β€’Customer/fleet-account relationship management
  • β€’P&L accountability at dealer service departments
Next: Regional service manager, fleet maintenance director, or independent shop owner.

Interview Questions & Answers

5 free questions below. Career Kit unlocks 13 total plus resume bullets for every level.

Q1. Walk me through diagnosing a truck stuck in derate.technical
Start with the active fault codes on the OEM tool. Common derate causes: DEF quality/level fault, SCR NOx efficiency fault, or DPF soot overload. Confirm which system is calling the derate, verify sensor readings match physical conditions (don't parts-cannon a NOx sensor if the DEF pump is dead). Run a forced regen only after you've confirmed the aftertreatment can support it. Log every step for the warranty claim.
Q2. How do you approach a repeat comeback on the same truck?situational
Own the ticket. Pull the previous repair order, see what was done, and don't repeat the same test. Interview the driver directly β€” 'when does it happen, hot or cold, loaded or empty?' β€” then let the truck fail while you're on it. Comebacks kill shop reputation faster than any bad repair; foreman track candidates are the ones who take the comeback ticket voluntarily.
Q3. Tell me about the hardest diagnostic you've solved.behavioral
STAR: intermittent no-start on a fleet Kenworth T680, 4 comebacks. Cummins Insite showed no faults; DVOM'd the crank sensor circuit and found intermittent open at the connector after heat-soak. Repinned the connector, added heat-shrink, no comeback in 90 days. Interviewers screen for methodical over lucky.
Q4. How do you handle a driver who thinks the truck is fine but the fault log says otherwise?situational
Show them the data. Print the fault log with timestamps and freeze-frame data, walk through what the codes mean in plain language. Drivers who don't trust the shop become part of the problem. If they still push back, escalate to the fleet manager with the report attached β€” don't argue in the bay.
Q5. Where do you see your career in 5 years?closer
Master certified across Cummins, Detroit, and PACCAR, with EV/hybrid factory training, and moving into a Lead Diagnostic Tech or Field Service role. I want to stay on the wrench for now β€” service management is a great path but I'm at my best troubleshooting.

Resume Template β€” Journeyman Diesel Technician (2-8 yrs)

Copy these bullets into your resume as a starting point. Career Kit includes bullets for every level of the ladder.

Journeyman Diesel Technician (2-8 yrs)
  • β–ΈDiagnose and repair Cummins X15, Detroit DD15, and PACCAR MX-13 engines across a 320-unit sleeper fleet at [Fleet].
  • β–ΈASE Master Medium/Heavy Truck (T1-T8) + Cummins Level 3 factory training.
  • β–ΈReduced average diagnostic time on emissions/aftertreatment tickets from 4.2 hrs to 2.6 hrs via updated shop procedures.
  • β–Έ$78k base + $12k overtime + $4k tool allowance + full benefits. Zero warranty comebacks in FY24.

What Gets You Rejected

  • βœ—Parts-cannon diagnostician β€” replaces sensors and modules without confirming root cause.
  • βœ—Won't invest in OEM factory training or ASE certs β€” signals stagnation and hurts shop labor rate.
  • βœ—Sloppy paperwork on warranty claims β€” kills dealer warranty recovery revenue.
  • βœ—Weak with wiring diagrams and CAN-bus β€” modern trucks are 60% electrical work.
  • βœ—History of tool theft, missed shifts, or safety violations β€” instant screen-out at fleet shops.
  • βœ—Won't take on-call or road-call rotation at fleet operations.

Salary Negotiation Levers

  • βœ“ASE Master Medium/Heavy Truck certification bumps hourly rate $2-4/hr at most dealers.
  • βœ“OEM factory training (Cummins Level 3, Detroit Master, PACCAR PRO) triggers pay-band jumps.
  • βœ“Tool allowance $2-5k/yr is negotiable and often forgotten at signing.
  • βœ“Shift differential (2nd shift +$2-4/hr, 3rd shift +$3-6/hr, weekend premium) is common at fleet shops.
  • βœ“Mobile/road-call flat rate or overtime multiplier β€” negotiate the callout minimum.
  • βœ“Signing bonus $3-15k common in tight labor markets, especially for master-certified techs.
  • βœ“Continuing education budget for OEM training days and travel to factory schools.

Bus and Truck Mechanics and Diesel Engine Specialists Resume Review β€” $29

Personalized resume review from someone who has hired bus and truck mechanics and diesel engine specialistss. Purchase, email your resume to support@weblabra.com, and receive detailed written feedback within 7 days.

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Bus and Truck Mechanics and Diesel Engine Specialists Career Kit β€” $19

  • βœ“ All 13 interview questions with expert answers
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  • βœ“ Resume bullets for every level of the career ladder
  • βœ“ 30–60–90 day plan for your first role
  • βœ“ Cover letter templates specific to this occupation
  • βœ“ Detailed salary negotiation script
  • βœ“ Ranked list of certifications with cost + ROI
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Bus and Truck Mechanics and Diesel Engine Specialists Salary by State

Best Cities (cost-adjusted) β†’

Salary Map β€” Click a state for details

$47K
$80Kβ–  No data

Top Paying States

Hawaii
$80K
+30%
Washington
$78K
+26%
Alaska
$76K
+22%
Maryland
$75K
+21%
California
$74K
+20%
Massachusetts
$73K
+19%
New Jersey
$72K
+17%
New Hampshire
$71K
+16%
Colorado
$70K
+14%
New York
$70K
+13%
Vertical line = national median. Click a state for full details.
StateMedianvs. National
Hawaii$80,080+29.6%
Washington$77,900+26.1%
Alaska$75,580+22.4%
Maryland$74,790+21.1%
California$73,950+19.7%
Massachusetts$73,270+18.6%
New Jersey$72,340+17.1%
New Hampshire$71,390+15.6%
Colorado$70,480+14.1%
New York$70,100+13.5%
1–10 of 51

Bus and Truck Mechanics and Diesel Engine Specialists Salary by Metro Area

Metro AreaMedianvs. National
San Jose-Sunnyvale-Santa Clara, CA$88,980+44.1%
Urban Honolulu, HI$85,040+37.7%
Seattle-Tacoma-Bellevue, WA$82,330+33.3%
San Francisco-Oakland-Fremont, CA$82,100+32.9%
Bremerton-Silverdale-Port Orchard, WA$80,450+30.2%
Boulder, CO$79,030+27.9%
Olympia-Lacey-Tumwater, WA$78,960+27.8%
Paducah, KY-IL$78,900+27.7%
Bellingham, WA$78,330+26.8%
Napa, CA$78,070+26.4%
1–10 of 390
Data Source: U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics (OEWS). Data reflects the most recent annual survey.
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A bus and truck mechanics and diesel engine specialists earning $61,770/year would need 965 years to match Stephen Curry's NBA salary, or 1036 yearsto match Patrick Mahomes' NFL contract.
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View Bus and Truck Mechanics and Diesel Engine Specialists salary trend (2011–2024) β†’