Mobile Diesel Medic

Mobile Diesel Medic operates as a mobile heavy-duty repair service serving the Raleigh-Durham metro area and the broader Triangle region, including Apex, Cary, and Morrisville. Founded and led by owner-operator Mark Armstrong, the business brings complete truck and equipment repair directly to client locations, eliminating the need to transport disabled vehicles to a fixed facility. With a rating of 4.6 stars drawn from 41 customer reviews, Mobile Diesel Medic has accumulated over a decade of documented service history, primarily maintaining commercial fleets and serving individual owners of diesel-powered RVs, buses, and construction equipment.

What distinguishes Mobile Diesel Medic from traditional shop-based repair operations is their fully-equipped mobile model, their service trucks carry extensive tooling, diagnostic computers, and welding apparatus, enabling repairs to be completed on-site within a single visit rather than holding equipment hostage at a back lot for weeks. Their computer and electrical diagnostics cover modern diesel engines including International, Cummins, and Freightliner platforms, with Mark maintaining current dealer software updates. They additionally offer hydraulic system repair, air conditioning service, and emergency backup generator installations, a particular advantage for commercial operations requiring continuous power availability.

Multiple reviewers specifically commend Mark Armstrong's diagnostic expertise. Stan Kiyota described how Mark contacted Newmar directly to understand the specific starting sequence of a 2020 Newaire motorhome before arriving, then resolved a Cummins ISB start fault through engine computer reset in 90 minutes. A commercial fleet manager noted Mark completed an emergency top-end engine rebuild the day before Thanksgiving and worked through the weekend, calling each morning with progress updates while completing additional minor repairs at no extra charge.