Professional semi truck diagnostics and repairs serving Lafourche Parish, Louisiana

Heavy Duty Diagnostics That Get You Moving

When your semi truck won't start or runs rough in Lafourche Parish, you need answers fast. You might see warning lights across the dash, hear unusual engine noise, or notice poor throttle response on the highway. M&M Mobile Repair LLC brings diagnostic equipment and repair tools directly to your location in Lafourche Parish, cutting down the time your truck sits idle and getting you back to your route.


Semi truck diagnostics involve connecting to your vehicle's onboard computer system to read fault codes, checking fuel delivery, testing the air brake system, and inspecting electrical circuits. The process includes physical inspection of the engine bay, exhaust components, and drivetrain to confirm what the codes indicate. Once the problem is identified, repairs are completed on-site when parts and conditions allow, or you receive a clear explanation of what comes next and what parts are needed.


If your semi truck is showing warning lights or running poorly in Lafourche Parish, reach out to discuss what you're noticing and schedule a diagnostic visit.

You start with a conversation about what you've noticed, whether that's a specific code, performance issue, or visible leak. The diagnostic process in Lafourche Parish includes scanning for active and stored codes, testing sensors and actuators, checking fuel pressure, and evaluating air intake and exhaust flow. This step-by-step approach ensures the actual cause is found rather than replacing parts based on guesswork.


After diagnostics are complete, you'll know what component failed, why it failed, and what needs to happen to fix it. You'll see the truck respond normally to throttle input, warning lights go off after repairs, and systems return to proper operating ranges. If a tire is damaged or showing uneven wear, that gets addressed during the same visit to keep you safe on the road.


Some repairs require ordering parts or working in a shop environment, especially if welding or heavy disassembly is involved. Mobile repairs cover most electrical, fuel, brake, and tire issues, along with many engine and drivetrain problems that don't require a lift. The goal is to get your truck running correctly without unnecessary downtime or trips to a distant shop.

How Diagnostics Pinpoint Problems Before Repairs Begin

Car engine bay with front bumper and components removed for repair.


Tire Repair & Replacement Services



Keeping your semi truck’s tires in top condition is crucial for safety, performance, and uptime. At M&M Mobile Repair, we offer comprehensive tire repair and replacement services right at your location — whether you’re on the road or in your yard. Our technicians are equipped to assess tire damage and determine the best solution for your situation.


Our tire services include:

  • On-site tire repair for punctures, flats, and minor damage
  • Professional tire replacement when repairs aren’t viable
  • Mounting and balancing to ensure smooth, safe operation
  • Inspection of tread, sidewalls, and overall tire condition
  • Air pressure checks and adjustments for proper load handling


Whether you need a quick repair to get back on the road or a full tire replacement to meet safety and DOT standards, our team delivers fast, reliable service designed to minimize downtime and keep your fleet rolling safely

You probably have a few questions before scheduling

ASE certification and family ownership combine to deliver mechanical repairs you can trust completely.


  • What does a semi truck diagnostic actually test? The diagnostic scan reads fault codes from the engine control module, transmission, ABS system, and other onboard computers. It also includes physical checks of wiring, sensors, fuel delivery, and air pressure to confirm what the codes indicate.
  • How long does a diagnostic visit usually take? Most diagnostics take between one and two hours depending on the number of codes and the complexity of the system being tested. If repairs can be done immediately, the total time depends on what needs to be replaced or adjusted.
  • What happens if the problem requires a part you don't have? You receive a clear diagnosis with the part number and a timeline for ordering and installation. Many common parts are kept in the service vehicle, but specialized components may need to be sourced from a supplier.
  • Can you handle tire issues during the same visit? Yes, semi truck tire repair and replacement are part of the service. If a tire is damaged, losing pressure, or showing uneven wear, it gets addressed on-site with the tools and equipment brought to your location.
  • Why use mobile diagnostics instead of driving to a shop? Mobile diagnostics save you from driving a truck that may not be safe or legal to operate on public roads. You avoid towing costs and keep your truck where it's parked until the problem is identified and repaired.


M&M Mobile Repair LLC works with semi trucks across Lafourche Parish and understands the pressure to stay on schedule. If your truck is showing codes, running rough, or dealing with a tire problem, get in touch to arrange a diagnostic visit that fits your timeline.