Apex Diesel Repair | Diesel Mechanic Services

Apex Diesel Repair & Parts operates as a heavy-duty diesel truck repair shop in New Braunfels, Texas, founded in 2014 by Dale Jeff, a disabled veteran who built the business around honesty and hands-on expertise. The shop maintains a team of four master technicians across three service bays plus a mobile repair unit, offering 24/7 emergency roadside assistance and covering New Braunfels, San Antonio, and the surrounding corridor between Austin and San Antonio along I-35 and Highway 46. With 249 customer reviews yielding a 4.3-star average, the shop has earned a solid reputation among commercial fleet operators and individual truck owners alike who need responsive service when breakdowns occur.

What distinguishes Apex from neighboring diesel shops is their mobile service capability paired with comprehensive in-shop diagnostics, a combination that lets technicians repair trucks at customer locations or bring them back to the facility for major work. Their service menu includes DOT federal inspections, engine reprogramming and tuning, EGR and DPF emission system repairs, and specialized heavy equipment and military equipment service. The shop also handles Trailer Repair and Refurbishment, welding and fabrication, and express lube services, making them a single point of contact for fleet operators who otherwise juggle multiple specialty shops.

Customer experiences split sharply: GY's 2025 review describes a breakdown in communication, he paid $250 upfront for a diagnostic call in Bulverde, waited four hours, and received only a photograph without the agreed-upon service. Greg Harris, on the other hand, called at 3 AM during a breakdown and received same-day arrival, fixing both his front bumper and taillight in under 30 minutes. Ryan Profile called on a Saturday with a no-start condition and received remote diagnostic guidance that got his truck running again without a shop visit. Kirill praised the team for fairly pricing a trailer air leak repair and maintaining clear communication throughout.