Diesel Shop Foreman (Master Diagnostic Lead)

Job Description

Job Description

Western Truck Exchange is rebuilding and growing our service department, and we’re hiring a hands-on Diesel Shop Foreman (Master Diagnostic Lead) with the skills and respect to run the floor. As the Shop Foreman , you’ll be the shop’s technical authority—advanced diagnostics, dispatch/workflow, and quality control—so repairs get done right the first time. You’ll also have support from Service and Parts leadership to remove bottlenecks (parts, approvals, tooling, scheduling) and keep production moving. 

This role is the communication hub between technicians, advisors, and parts, ensuring repairs are completed properly, efficiently, and safely.

• Real authority and ownership: diagnostics + dispatch + quality + shop workflow.

• Leadership seat in rebuilding the department—your impact will be immediate 
• Strong perks, including: 

  • Profit sharing plan.

  • Quarterly incentive opportunities.

  • Paid training.

  • Employee referral bonus.

  • CDL reimbursement support (as applicable for renewals/endorsements).

• Perform advanced diesel engine diagnostics and electrical troubleshooting

• Triage incoming commercial truck repair work and build the repair plan 

• Assign jobs based on technician skill level and job complexity

• Coach, support, and assist technicians as needed to get repairs completed correctly

• Drive first-time-fix accuracy and reduce comebacks

• Own workflow and daily communication between technicians, service advisors, and parts

• Run daily production meetings (10–25 minutes)

• Monitor open repair orders, promised times, and parts availability

• Walk the floor regularly to remove bottlenecks

• Adjust priorities in real time to keep production on track

• Final review and sign-off on repair orders

• Confirm documentation accuracy and proper road testing when required

• Enforce a no-comeback mindset

• Ensure technician notes clearly document root cause and repair performed

• Coordinate with Parts on warranty and core returns

• Maintain a safe, and organized shop environment

• Ensure diagnostic tools and shop equipment accountability

• Support technician recruiting, interviewing, and onboarding

• Coach and develop Diesel Technician

• Participate in performance management and staffing decisions (including discipline when needed)

• Build a high-performing commercial truck repair team that does quality work

• Utilize modern diagnostic software and AI-assisted diagnostic tools to improve troubleshooting speed and root-cause accuracy

• Apply strong mechanical judgment and safe repair practices

• Valid Class A CDL ( or willing to obtain if not currently held ) to road test tractors as needed.

• 5+ years of medium/heavy-duty truck repair experience.

• Strong technical knowledge and diagnostic problem-solving ability.

• Strong communication and organization skills; ability to lead and support technicians.

• Ability to road test vehicles as needed to diagnose and verify repairs.

• Ability to speak Spanish fluently.

• Familiarity with OEM and warranty processes and dealership operations.

• Comfort driving workflow discipline: clear documentation, daily planning, and real-time floor management.

• Familiarity with CDK.

Who We Are

At Western Truck Exchange, we believe our people are the driving force that keeps our customers — and the trucking industry — moving forward. We foster a culture of respect, appreciation, and opportunity, recognizing every employee’s contribution to our shared success.

Western Truck Exchange is the leading retailer of used and new medium-duty commercial trucks in Los Angeles. Established in 1922, we’re one of California’s oldest licensed dealerships—and we’re proud to be an International dealership with a service team focused on doing the job right, safely, and professionally. We are fully certified for CAT and Cummins repairs , and qualified to provide  Allison maintenance and rebuild services.  

We’re always looking for motivated, hardworking professionals who are passionate about helping fleets stay on the road. If you’re ready to bring your skills to an industry where reliability matters most, we’d love to hear from you.

We are an equal opportunity employer and prohibit discrimination/harassment in accordance with applicable laws.