Mobile diesel repair is the industry's fastest-growing business model — and most new operators overspend on the truck and underspend on diagnostics. The sequence below is distilled from operators who made it past year two.
Phase one: the diagnostic core ($3,300)
- Autel MS909CV ($2,795) — the mobile standard: fast, wireless, regens on everything.
- Cable master set ($389) — the connector you forgot is always the one you need.
- DEF test strips, fuses, dielectric grease, jump pack ($150) — the regen enablers.
Phase two: revenue expanders (months 3–9)
- Refurb Toughbook with OEM software for your most-seen brand ($2,500–$4,000) — when programming jobs justify it.
- Battery/electrical tester, quality torque set, air tools — as job mix demands.
- TPMS service capability — if your scanner supports it, it's near-zero marginal cost.
The business side nobody mentions
- Price diagnostics as a service line, not a giveaway — $150–250 for a diagnostic call with documented findings.
- Photo-document everything; fleets pay faster with evidence.
- Know your decline list: programming, internal engine, lift work. Mobile credibility comes from boundaries.
- A remote-support relationship (ours or another) backs you up on platforms you rarely see.
Frequently Asked Questions
How much can mobile diesel techs realistically earn?
Operators we supply report $150–250/hr effective rates on diagnostic and aftertreatment work once established — the diagnostic capability is what separates that from $95/hr wrench work. The tools are the business model.
What vehicle do I need to start?
A reliable pickup with a cap or a used step van — $15–40k. Don't buy the $80k service truck in year one; the diagnostic equipment earns the money, the vehicle just carries it.