Electrics, electronics and diagnostics for construction machinery
Comprehensive electrical and electronic systems service. Installation diagnostics, wiring harness repair, controller programming and sensor service.
We offer mobile diagnostics and repair of electrics and electronics on construction machinery: computer diagnostics and fault code reading, wiring harness and connector repair, starting and charging systems. We work at the machine, so it does not need to be taken to a workshop.
On a modern construction machine the controller decides how the engine, hydraulics and exhaust aftertreatment work. A faulty sensor or a chafed wire can disable a function or put the machine into limp mode even though everything is mechanically sound. That is why electronics are the starting point of most of our diagnoses.
At a glance
- Scope
- Computer diagnostics, controller, harness and connector repair, sensors and actuators, starting and charging, lighting.
- Machines
- Excavators, loaders, backhoe loaders, rollers, pavers, cold planers, agricultural and industrial machines with electronic control.
- Brands
- Caterpillar, Volvo CE, JCB, Komatsu, Liebherr, Doosan, Hitachi, Takeuchi, Bobcat, Bomag, Hamm, Dynapac, Wirtgen, Vögele and others. We are an independent service, not a brand dealer.
- Response time
- Mon–Fri 7:00–17:00. Standard requests are usually handled within 24–48 business hours; for a breakdown that stops the machine we aim to arrive the same working day; regular customers get 24/7 emergency support. Enquiries in English by form, e-mail or WhatsApp; the phone number is Polish (+48).
- Area
- The whole of Poland, the Czech Republic and Slovakia. We come to the machine; parts that need rebuilding go to our workshop.
- Prices
- We agree the cost before work starts. What the price of diagnostics, labour and travel depends on: pricing and travel principles.
Scope of Services
Electrical installation diagnostics
Wiring harness repair
Controller and onboard computer service
Sensor and actuator replacement
CAN/LIN system repair
Installation of additional components
Professional machinery service - Why Voltscan?
Voltscan is your reliable partner for professional construction and industrial machinery service. For over 20 years we have specialized in comprehensive diagnostics, repair and maintenance of heavy construction equipment. Electrical and electronic repair for construction machinery is one of our core specialisations. Our mobile service, equipped with modern diagnostic tools, comes directly to your machine's location in Poland, the Czech Republic, Slovakia and beyond, so there is no need for costly and time-consuming transport. We offer a full range of services - from simple repairs to complex regeneration of electronic, hydraulic and electrical systems. We work with all leading brands: Wirtgen, Vögele, Hamm, Bomag, Dynapac, Ammann, John Deere, New Holland, Claas, Fendt, Valtra, Steyr, Doosan, Liebherr, JCB, Volvo, Komatsu, Caterpillar, Takeuchi, Bobcat, Doppstadt, Terex and many others. Every repair is performed with the utmost care by certified specialists with many years of industry experience.
Years of experience
Machines repaired annually
Working hours
Breakdown support for regular customers: 24/7
Report a Fault
Fill out the form and we will contact you
Writing after hours? We'll call you back by 8:00 on the next working day.
Computer diagnostics for construction machinery
We read and analyse fault codes, watch live operating data and run actuator tests, using testers compatible with manufacturers' diagnostic systems such as CAT ET. A fault code points to the circuit with the problem, not always to the failed part, so we confirm every reading with measurements.
Controller and wiring harness repair
Most electrical faults on machines are moisture and corrosion in connectors, harnesses chafed at joints and edges, and mechanical damage. We locate open circuits and shorts, repair the harness at the damaged spot instead of replacing it whole, and check CAN bus communication between controllers.
Mobile machine electrician
- the machine will not start or cranks too slowly: batteries, starter, relays, earth connections,
- no charging: alternator, voltage regulator, wiring,
- sensors, display, camera or work lights not working,
- joystick, solenoid valve and pressure sensor faults in the hydraulic control (see hydraulic repair),
- DPF, AdBlue/SCR and EGR faults on the sensor and wiring side (see DPF cleaning and AdBlue repair).
What do you gain by choosing our service?
Specific benefits for your business
Fast response
For urgent breakdowns we aim to be on site the same working day. We understand that every hour of downtime means financial losses.
Computer diagnostics
We use professional diagnostic tools compatible with systems from all manufacturers. Precise reading of error codes and operating parameters.
Mobile service
You don't need to transport the machine to the workshop. We come with complete equipment directly to your workplace or construction site.
Spare parts
We encourage customers to buy parts themselves - they can use the discounts they get from their own suppliers. We advise on what needs replacing.
Experienced team
Our technicians have certificates and training from machine manufacturers. They constantly improve their qualifications by participating in specialized courses.
Competitive prices
Transparent price list and clear billing terms. Before starting work we present a detailed estimate of repair costs.
Advanced technical capabilities
Professional diagnostic equipment and service tools
Electronics diagnostics
Professional testers and oscilloscopes for analysis of control systems, ECU, sensors and actuators. Programming and calibration of controllers.
Electrical measurements
Multimeters and insulation testers. Diagnostics of electrical installation, alternator, starter, batteries.
Hydraulics
Pressure gauges, flow meters, pressure tester. Diagnostics of pumps, valves, hydraulic cylinders, control systems.
Oil analysis
Testing cleanliness and condition of hydraulic, engine oil. Detection of contamination and wear products.
Temperature measurements
Thermal cameras for detecting component overheating, leaks, cooling problems.
Load tests
Verification of power, torque, pump output after repair under actual load conditions.
We service all leading brands
Wirtgen
Vögele
Hamm
Bomag
Dynapac
Ammann
John Deere
New Holland
Claas
Fendt
Valtra
Steyr
Doosan
Liebherr
JCB
Volvo
Komatsu
Caterpillar
Takeuchi
Bobcat
Doppstadt
Terex
Hitachi
Hyundai
How does the repair process work?
Breakdown report
Phone contact or through form. Describe the problem, the location and the machine type. We get back to you to agree the details.
Initial diagnostics
Based on problem description we prepare for repair: select parts, tools, plan arrival time.
Service arrival
Our mobile team arrives on site with complete diagnostic equipment and most commonly used spare parts.
Detailed diagnostics
We perform computer tests, electrical and hydraulic measurements. Precisely determine the cause of failure.
Repair quote
We present detailed cost calculation: labor, parts, travel. We start work after your approval.
Repair
Replacement of damaged components, calibration, tests. We document all performed activities.
Final tests
We verify repair correctness: load tests, parameter control, error clearing.
Report
We provide detailed service report and photographic documentation of completed work. We give operational recommendations.
Professional service equipment
OBD diagnostic testers
Professional scanners compatible with CAT ET, Volvo VCADS, JCB Service Master, Komatsu KOMTRAX systems
Digital oscilloscopes
Analysis of electrical waveforms, sensor diagnostics, CAN/LIN signal quality testing
Hydraulic pressure testers
Precise pressure gauges and flow meters for measuring pump and valve performance
Thermal cameras
Detection of overheated components, leaks, cooling problems
Multimeters and insulation testers
Voltage, current, resistance measurements, high-voltage installation insulation tests
Specialized tools
Torque wrenches, hydraulic hose crimping equipment, pullers
Fast response time
We work Monday to Friday, 7:00–17:00. Standard requests in Poland, the Czech Republic and Slovakia are usually handled within 24–48 business hours. For breakdowns that stop the machine, we aim to arrive the same working day. Regular customers get 24/7 emergency support, including weekends and public holidays. After you call or send the form, we get back to you to agree the details and the arrival time.
Warranty and service quality
All work is documented with detailed service reports describing work performed, parts used and operational recommendations. We offer service packages for regular customers and technical consulting.
Frequently asked questions
How much does computer diagnostics of a construction machine cost?
It depends on the diagnostic time and travel. We agree the scope and price when you report the fault and quote the repair before starting. See our pricing principles.
The machine will not start or has gone into limp mode. Will you come out?
Yes. For a breakdown that stops the machine we aim to arrive the same working day. On site we read the fault codes, measure the supply and check the affected circuits.
Do you repair wiring harnesses instead of replacing them?
Yes, when the damage is local. We replace the damaged section of wire or the connector and protect the repair against moisture and chafing.
How quickly can you arrive in case of breakdown?
We are available Monday-Friday 7:00-17:00. For standard breakdowns - 24-48 business hours. For urgent breakdowns causing machine downtime we offer express service - same business day arrival.
Is the service mobile?
Yes, we have fully equipped mobile service teams. We come directly to the construction site or machine location with complete diagnostic equipment.
What machine brands do you service?
We service all leading brands: Wirtgen, Vögele, Hamm, Bomag, Dynapac, Ammann, John Deere, New Holland, Claas, Fendt, Valtra, Steyr, Doosan, Liebherr, JCB, Volvo, Komatsu, Caterpillar, Takeuchi, Bobcat, Doppstadt, Terex and many others.
Do you use original spare parts?
We encourage customers to purchase required parts themselves - this way they can build their own discount packages with their suppliers and maximize benefits from regular purchases. We focus on professional diagnostics and repairs.
How does the repair process work?
Report → Initial diagnostics → Service arrival → On-site diagnostics → Quote → Repair → Tests.
Can I schedule a preventive inspection?
Yes, we offer comprehensive preventive inspections according to manufacturer recommendations. For companies with larger machinery fleets we prepare dedicated service packages.
What is the cost of service travel?
We calculate travel cost individually depending on location. We will provide the exact amount before the visit.
Do you work on weekends?
We normally work Monday-Friday 7:00-17:00. For regular customers in case of breakdowns we provide emergency support 24/7, including weekends and holidays.
How can I get a repair quote?
You can get a quote after initial diagnostics by phone or after detailed on-site diagnostics. We always present transparent calculation before starting work.
What it costs and how we charge for travel
Every repair is quoted before work starts: diagnostics, labour, parts and travel separately. Details: Pricing and quoting principles
Machine electrics and electronics: where we travel
We work across Poland, the Czech Republic and Slovakia. Below are the countries and regions we cover; we travel to any location there on the same terms.
Did you know that...
Regular maintenance noticeably extends the life of construction machinery. Changing hydraulic oil at the manufacturer's intervals prevents costly pump and valve repairs.
Many electronic system failures in construction machinery result from wiring and connector problems. Regular electrical connection checks can prevent most failures.
Hydraulic oil temperature above 80°C ages it many times faster. An efficient cooling system is the foundation of long-term hydraulic operation.
Computer diagnostics can detect many problems in electronic control systems before they lead to serious failure. Regular error reading is key to predictable operation.
Hydraulic filters should be replaced at the machine manufacturer's intervals. Contaminated oil is one of the most common causes of hydraulic system failures.
Batteries in construction machinery should be checked every 3 months. Weak battery is the most common cause of starting problems, especially in winter.
Need help with your construction machinery?
Contact us today - we work Mon-Fri 7:00-17:00, with 24/7 breakdown support for regular customers
+48 504 536 966