LG — Equipment Diagnostics & Repair. Keep working.

LGDiag.com · Mobile diagnostics

Find the fault.
Keep working.

Mobile diagnostics for trucks, tractors, and heavy equipment in the Rio Grande Valley and South Texas. We use fault scans, live operating data, and targeted testing to help find the cause and guide the repair.

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Commercial vehiclesOff-highwayAgricultureRio Grande Valley
Agricultural equipment in the field
Diagnostic insight, right at your machine.

Vehicles & equipment we service

On the road.
On the job. In the field.

Diagnostic support for the vehicles and machines that keep South Texas fleets, jobsites, and farms moving, with coverage across multiple makes.

Excavator at a construction siteAvailable now

Off-Highway Diagnostics

Mobile diagnostics for excavators, loaders, skid steers, backhoes, graders, cranes, and other supported heavy and compact equipment. Coverage also includes selected stationary engines and road-maintenance machines.

  • Fault & symptom tracingReview controller faults and operating data to investigate low power, warning lights, and intermittent problems.
  • Electronic system checksUse wiring diagrams and machine-specific technical information to help trace sensor, wiring, and control-system concerns.
  • Aftertreatment supportInvestigate DPF and DEF-system warnings, with supported regeneration procedures when machine conditions allow.
  • Calibrations & maintenanceSupported sensor and actuator calibrations and service procedures to assist repairs and planned maintenance.

Coverage varies by machine, controller, and connection. Send the make, model, year, and serial / PIN plate so we can confirm the requested function.

Check off-highway coverage
Agricultural equipment working in a fieldAvailable now

Agriculture Diagnostics

Diagnostic support for tractors, combines, forage and grape harvesters, sprayers, balers, and supported self-propelled or towed implements. We help track down faults that interrupt field work.

  • Fault scans & live dataRead supported controllers and monitor sensor values to investigate warning lights, power loss, and operating faults.
  • Tractor & implement systemsInvestigate electronic faults and supported ISOBUS communication between tractors and implements.
  • Component tests & calibrationActivate supported components and perform sensor or actuator calibrations using the relevant service procedure.
  • DPF & service functionsInvestigate aftertreatment warnings and carry out supported DPF regeneration and service procedures when appropriate.

Functions depend on the tractor or implement model and installed systems. Send each unit's details so we can confirm coverage before scheduling.

Check agriculture coverage
Blue semi truck and box trailer parked in an open lot at sunset Available now

Now serving commercial vehicles

Commercial Vehicle Diagnostics

Mobile diagnostic support for trucks, buses, trailers, work vans, and commercial pickups. From a single work truck to a fleet, we help identify faults and plan the next repair.

Check your vehicle's coverage
  • Engine & transmissionFault scans, live readings, and targeted performance tests.
  • ABS & trailer systemsInvestigate electronic braking faults and warning lights.
  • DPF, DEF & SCRAftertreatment troubleshooting and supported DPF regeneration when appropriate.
  • Tests & calibrationsSupported component activations, cylinder cutout tests, injector coding, and service resets.

Coverage and functions vary by make, model, year, and installed system. Send your VIN and the service needed so we can confirm support before scheduling.

Let's check your vehicle or machine.

Text the make, model, year, and the VIN or a photo of the serial / PIN plate. We will confirm system coverage and available service functions before scheduling.

Ask about coverage

Diagnostic capabilities

A clearer view
of the problem.

We connect to supported electronic systems, review what the vehicle or machine is reporting, and use targeted tests to guide the next step.

01 /

System scans

Identify fault codes in supported controllers and investigate engine, transmission, braking, hydraulic, and electronic system concerns.

02 /

Live operating data

Review sensor readings, temperatures, pressures, and operating values to understand when and how a problem appears.

03 /

Component tests

Command supported components and check their response to help narrow down the cause of a fault.

04 /

Aftertreatment support

Investigate DPF, DEF, and SCR warnings, including supported regeneration procedures when appropriate for the vehicle or machine's condition.

05 /

Calibrations & resets

Supported sensor and system calibrations, injector coding, and maintenance resets following the relevant service procedure.

06 /

Diagnostic reports

Document detected faults, test findings, and post-repair checks so you understand what was found and the next steps.

Available tests and service functions vary by make, model, year, controller, and connection. We confirm the requested capability for your vehicle or machine before service.

Repair

On-site work guided by the diagnostic findings.

Maintenance

Service planned around operating hours and maintenance schedules.

Verification

Follow-up scans and operating checks to assess the repair.

Recognize the symptoms?

Let's start with
what you're seeing.

Text us the exact fault code and a dashboard photo. A few details help us understand what your vehicle or machine needs.

Text us about your vehicle or machine

DPF & regen problems

Regen failure, soot load, aftertreatment warnings

Derate & low power

Power loss, limp mode, performance faults

No-start & hard start

Cranking, fuel, electrical, or sensor issues

Warning lights & codes

Active faults and intermittent alerts

Electrical & communication faults

Wiring, sensors, CAN networks, power and grounds

Hydraulic & function issues

Slow movement, no lift, intermittent operation

Let's talk diagnostics

Have a question?
Let’s talk.

Ask about your vehicle or equipment, a warning code, or a specific diagnostic function. Text, WhatsApp, or email us to confirm coverage and discuss the next step.

Rio Grande Valley & South Texas

Serving commercial vehicle owners, fleets, farms, ranches, and construction jobsites in Mission, McAllen, Edinburg, Pharr, Weslaco, and surrounding communities.

Commercial vehicles · Off-highway · Agriculture

Before you message

Do you come to my farm or jobsite?

Yes. We provide mobile diagnostic service for vehicle owners, fleets, farms, ranches, and construction jobsites across the Rio Grande Valley and surrounding South Texas communities. Send your location so we can discuss the visit.

Can you diagnose my truck, tractor, or machine?

We support commercial vehicles, off-highway equipment, and agricultural machinery. Coverage depends on the make, model, year, controller, and connection. Send the VIN or a photo of the serial / PIN plate so we can confirm support before scheduling.

What should I send with my message?

Include your make, model, year, city or jobsite, and the symptoms or exact fault code. A dashboard photo and any recent repair history help us understand the next step.

Text LG

956-792-9928

A quick message is all it takes to start the conversation.

Text us for information

Opens your messaging app. On a computer? Text the number above from your phone.

Message us on WhatsApp

Opens a ready-to-edit WhatsApp message. Add your equipment details and photos before sending.

Email info@lgdiag.com

Prefer email? Use the button above or copy info@lgdiag.com into your email app.

Helpful details to include

  • Vehicle or equipment make, model, and year
  • Your question, symptoms, or fault code
  • Your city or jobsite location

Attach a dashboard or fault-screen photo and the VIN or serial / PIN plate if available.