Mobile Diesel Mechanic

H&H Diesel Services is seeking an experienced, dependable, and motivated Mobile Diesel Mechanic to join our growing team. We specialize in heavy-duty truck and commercial fleet maintenance and repair, providing both shop-based and mobile repair services throughout San Antonio and South Texas. We are looking for a skilled technician who can work independently, diagnose mechanical and electrical problems accurately, and perform high-quality repairs in the field. This position is ideal for an experienced diesel mechanic who takes pride in their work, enjoys troubleshooting challenging problems, and wants to be part of a growing company that values its employees. Responsibilities Diagnose, troubleshoot, and repair heavy-duty diesel trucks and commercial vehicles at customer locations. Perform engine diagnostics and repairs on Cummins, Detroit Diesel, PACCAR, Caterpillar, and other diesel engines. Diagnose and repair electrical systems, wiring, sensors, and electronic components. Troubleshoot and repair aftertreatment systems, including DPF, DEF, EGR, and SCR systems. Perform repairs on air brake systems, suspension, steering, cooling systems, and drivetrain components. Perform preventive maintenance, DOT inspections, and general fleet maintenance. Utilize diagnostic software such as Cummins INSITE, Detroit Diesel DiagnosticLink, TEXA, JPRO, or similar programs. Respond to customer breakdowns and perform roadside repairs when required. Accurately document repairs, labor hours, diagnostic findings, and parts used. Maintain an organized, clean, and properly stocked mobile service truck. Communicate professionally with customers, dispatchers, and management. Follow company safety procedures and maintain high standards of workmanship. Qualifications Required: Minimum 3 years of hands-on heavy-duty diesel repair experience preferred. Strong mechanical, electrical, and diagnostic troubleshooting abilities. Experience working on Class 7 and Class 8 commercial trucks. Ability to diagnose and repair vehicles independently without constant supervision. Must have a valid driver's license and an acceptable driving record. Must have personal hand tools necessary to perform repairs. Ability to work outdoors and in varying weather conditions. Strong work ethic, reliability, and attention to detail. Ability to complete accurate repair documentation. Preferred: Experience with Cummins, Detroit Diesel, PACCAR, and Caterpillar engines. Proficiency with electronic diagnostic equipment and software. Experience diagnosing emissions and aftertreatment systems. ASE certifications. Previous mobile repair or roadside service experience. Experience with commercial fleet maintenance. Compensation & Benefits H&H Diesel Services offers: Competitive hourly compensation based on experience and skill level. Overtime opportunities. Company-provided mobile service truck for work-related use. Health insurance with the company paying 50% of employee-only premiums. Paid time off. Biweekly payroll. Stable, year-round employment. Opportunities for advancement as the company continues to grow. Supportive, team-oriented work environment. What We're Looking For We are not looking for someone who simply changes parts. We want a mechanic who can diagnose the problem, determine the proper repair, and get the customer back on the road. The ideal candidate is self-motivated, takes ownership of their work, can make sound repair decisions in the field, and understands the importance of minimizing customer downtime. We take pride in providing dependable, professional diesel repair services and expect our technicians to represent that same level of quality. Pay: $28.94 - $42.50 per hour Expected hours: 35.0 – 60.0 per week Benefits: Flexible schedule Health insurance Paid time off Work Location: In person

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