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Diesel & Truck Repair Shops in San Marcos, TX

6 of the 60 auto repair shops we list in San Marcos have diesel engine or heavy truck repair.

Diesel engines and heavy trucks need different tools, parts and training than passenger cars, and many shops turn them away. Every shop here names diesel, semi, heavy-duty or commercial truck work in its business name, listing or on its own website — a shop that services “cars, trucks and SUVs” is not enough.

  1. Hastings Diesel Performance

    119 Hp Business Dr, San Marcos, TX 78666

    Mon-Fri 9am-6pm

    Diesel & truck
    Call Website Directions

  2. CC Diesel and Automotive

    3600 N State Highway 123, San Marcos, TX 78666-2178

    Diesel & truck
    Call Website Directions

  3. APREMIER Auto Shops

    1418 S I-35 South Frontage Rd, San Marcos, TX 78666

    Transmission repairDiesel & truckBody & collisionFree estimatesTowing
    Call Website Directions

  4. Hwy 123 Diesel & Auto Repair

    15898 TX-123, San Marcos, TX 78666

    Mon–Fri 8:30am–5:30pm

    Diesel & truck
    Call Directions

  5. All Makes Automotive

    1000 River Rd Ste K, San Marcos, TX 78666

    Transmission repairDiesel & truckA/C repairBody & collision
    Call Website Directions

  6. Atx Fleet Services Truck And Trailer Repair

    222 Wonder World Dr, San Marcos, TX 78666-5937

    Mon-Fri 8am-5pm

    Mobile mechanicDiesel & truckFinancingFree estimates
    Call Directions
Say what you drive. A shop that works on diesel pickups (Duramax, Power Stroke, Cummins) is not always set up for semi trucks, and fleet shops may put contract customers first. If you run a commercial vehicle, ask whether they do DOT inspections.

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Diesel & Truck Repair Shops near San Marcos

Good to know

Do I need a diesel specialist for my pickup?

Most shops can handle routine maintenance, but fuel injection, turbochargers, diesel emissions systems (DPF, DEF, EGR) and engine repairs are best done by a shop that works on diesels every day.

Where can I get a DOT inspection?

Commercial truck shops and some diesel repair shops perform annual DOT inspections with a qualified inspector. Call ahead — not every truck shop offers them.