Heavy Vehicle Diagnostics & Auto Electrical Maitland & Hunter Region
Keeping Your Fleet Running, Not Waiting
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Advanced Heavy Vehicle Diagnostics — Precision That Saves You Time and Money
When your truck, excavator or heavy machinery grinds to a halt, every hour counts. At East Coast Diesel & Auto Electrical, we specialise in advanced heavy-vehicle diagnostics and mobile auto electrical repairs that get your diesel equipment back on the job quickly and safely.
From ECU and transmission faults to battery, starter and alternator issues, we use dealer-level diagnostic tools and genuine parts to detect, repair and prevent faults before they cause expensive downtime.
Based in Maitland, our fully mobile service covers Rutherford, Kurri Kurri, Cessnock, Thornton, East Maitland and across the Central Coast, supporting fleet operators, civil contractors and agricultural businesses with fast on-site response.
Advanced Heavy Vehicle Diagnostics — Precision That Saves You Time and Money
Modern diesel trucks and machinery rely on complex electronic control systems that require accurate diagnostics to stay reliable. Warning lights, loss of power, or intermittent faults can all trace back to the engine control unit (ECU), ABS, transmission, SRS (airbag), or countless sensors and modules spread throughout the vehicle.
At East Coast Diesel, we provide comprehensive fault scanning, module programming, and system resets for all major heavy-vehicle brands, including Isuzu, Hino, Kenworth, Volvo, Scania, MAN, Komatsu, Caterpillar, and John Deere.
Our advanced diagnostic process includes:
Full ECU, ABS, and transmission scanning using industry-leading tools
Real-time data monitoring to pinpoint intermittent or heat-related faults
Sensor and actuator testing across fuel, turbo, and intake systems
Electrical circuit load testing to identify voltage drops or resistance issues
Module reprogramming and error-code clearing after repair
With a focus on accuracy and transparency, you’ll receive a clear explanation of every finding before we begin any work. Our technicians interpret error codes, cross-reference live data, and verify the root cause so the same fault doesn’t return a week later.
Whether you manage a single tipper or an entire civil-works fleet, our diagnostics give you the certainty to keep vehicles moving without the cost of unnecessary part swaps or tows to a workshop.
When a vehicle refuses to start or electrical systems begin to fail, you need help that comes to you. Our mobile auto electricians operate fully equipped service vehicles capable of diagnosing and repairing a wide range of electrical faults on-site.
Common problems we solve include:
Battery failures and charging system faults
Alternator overcharging or voltage-drop issues
Starter-motor faults and solenoid wear
Blown fuses, damaged relays, or corroded connections
Broken wiring looms and intermittent signal faults
Lighting, indicator, and auxiliary accessory repairs
Our diagnostic process ensures we test before we replace, saving you time and money. We carry a range of heavy-duty batteries, alternators and starter motors suitable for trucks, utes, agricultural equipment, and earthmovers.
Case Example:
A local quarry operator in Kurri Kurri experienced repeated engine-light warnings and stalling in a loader. Our mobile technician arrived within hours, scanned the ECU, and found a failing crank-angle sensor and intermittent wiring fault. The sensor was replaced and wiring repaired on-site, eliminating the issue without towing or workshop delays.
Diesel engines rely heavily on precision electrical control. Small voltage variations can cause performance loss, rough idling, or complete shutdown.
Our qualified diesel auto electricians are specialists in diesel-specific electronics, including:
Injector wiring and pulse-width testing
Glow-plug control modules and circuit faults
Fuel-rail pressure sensors and harness inspections
Turbo actuator testing and boost-control diagnostics
EGR and intake-air temperature sensor analysis
CAN-bus fault tracing and repair
We combine electronic scan data with hands-on testing to confirm failures. This ensures a targeted fix rather than random part replacement.
If your truck struggles under load, produces black smoke, or enters limp mode, our diagnostic tools detect irregularities within the fuel and air systems before they develop into major repairs.
A properly functioning air-conditioning system is vital for comfort and safety, particularly for operators working in hot or dusty conditions. Electrical faults are among the most common reasons A/C systems fail.
Our team provides complete electrical fault-finding and repair for heavy-vehicle HVAC systems, covering:
Compressor clutch and relay circuits
Blower-fan and resistor pack faults
Evaporator temperature sensors and pressure switches
Control-panel, actuator and wiring harness issues
Regassing, leak detection and performance testing
We work on trucks, tractors, excavators and civil machinery across the Hunter region, restoring optimal cooling performance and ensuring reliable operation year-round.
How We Work
We understand that downtime is costly. Our service process is built for speed and simplicity while maintaining thorough workmanship. This process saves time, avoids towing fees, and gets your machinery back into production faster.
Need urgent assistance? Contact Our Roadside Team Today
Initial Contact
Call or send an online enquiry describing the fault or warning lights.
Rapid Dispatch
A mobile technician is sent directly to your site across Maitland, Rutherford, Cessnock or the Central Coast.
On-Site Diagnosis
We perform complete scanning, voltage tests, or mechanical inspections to isolate the cause.
Immediate Repairs
Most electrical and diagnostic repairs are completed on-site. For complex issues, we provide a clear plan and quote before proceeding.
Verification & Reporting
After repairs, we re-test all systems and clear error codes, ensuring the issue is resolved.
Why Fleet Managers & Operators Choose East Coast Diesel
When you operate heavy diesel machinery, you need a partner who understands the pressure of keeping equipment running. That’s where East Coast Diesel stands apart.
- Specialist Knowledge: Our technicians hold Cert III qualifications in Heavy Commercial Vehicle Mechanical Technology and Automotive Electrical Technology, along with full air-conditioning licences.
- Experience You Can Trust: Owner-operator Dillon James has been servicing trucks and heavy machinery since 2010, bringing over 15 years of hands-on experience to every callout.
- Fully Mobile Service: We come to you — whether you’re on a job site, depot, or rural property. Our service vehicles carry the tools, scanners, and parts required to handle most repairs immediately.
- Transparent Communication: Before any work begins, we explain the findings and costs in plain English so you know exactly what’s being done.
- Commitment to Downtime Reduction: We treat every job with urgency, understanding that operational delays cost more than repair bills.
By combining diagnostic accuracy with responsive service, East Coast Diesel has become the trusted choice for fleet managers, contractors, and machinery owners throughout Maitland and the Hunter region.
Service Areas Across Maitland & Central Coast NSW
Our mobile service network covers a wide region, ensuring quick response wherever your vehicles operate.
Primary Areas: Maitland, Rutherford, East Maitland, Thornton, Kurri Kurri, Gillieston Heights, Lochinvar, Telarah, Bolwarra Heights, Cessnock.
Extended Coverage: Newcastle, Central Coast, Singleton, Muswellbrook, and nearby rural and agricultural zones.
Wherever you’re based, we bring dealership-level diagnostics directly to your site — no workshop delays, no towing, no wasted time.
Frequently Asked Questions
Here are some frequently asked questions we receive regarding heavy vehicle diagnostics:
Can you diagnose engine lights and fault codes on heavy trucks?
Yes. We use professional-grade diagnostic scan tools compatible with all major heavy-vehicle makes. Our technicians interpret live data and freeze-frame results to identify the exact cause behind engine-light warnings, not just clear the code.
How quickly can you attend a breakdown?
Response times vary by location, but in most cases we can arrive the same day within the Maitland, Rutherford and Kurri Kurri areas. For emergency jobs, our roadside assistance team prioritises rapid dispatch to minimise downtime.
Do you handle both electrical and mechanical faults?
We focus on electrical and electronic diagnostics — the components that connect to or control mechanical systems. If a repair requires mechanical follow-up, we’ll advise clearly and coordinate with your preferred workshop.
Can diagnostics prevent breakdowns?
Absolutely. Routine diagnostic scans detect early faults such as failing sensors, weak batteries or voltage irregularities that, if ignored, lead to roadside breakdowns. Preventive diagnostics save money and extend equipment life.
Do you service fleets as well as individual owners?
Yes, we provide flexible arrangements for fleet managers including scheduled maintenance visits, pre-trip inspections and ongoing diagnostic support. Whether you run one truck or twenty, we tailor solutions to your operational needs.
What types of heavy vehicles do you work on?
Our experience covers trucks, utes, excavators, loaders, tractors, graders, dozers and other diesel-powered machinery used in transport, civil construction, agriculture and mining.
Are your repairs guaranteed?
Yes, all workmanship is guaranteed. We stand by every repair we complete and use only quality, tested components suitable for heavy-duty applications.
What payment options are available?
We accept card, EFT and account invoicing for established clients. Transparent quotes are provided before any job begins, so there are no surprises.
Your Local Heavy Vehicle Diagnostics Specialists
Electrical and diagnostic issues don’t wait for a convenient time — and neither do we. Whether it’s a truck that won’t start, a machine stuck on site, or a warning light that just appeared, our mobile team is ready to respond.
With 15+ years’ industry experience, modern diagnostic tools, and a strong reputation across Maitland and the Hunter, East Coast Diesel is the trusted name for heavy-vehicle electrical and diagnostic repairs.
Don’t lose another day to downtime.
Book a Diagnostic Service Today ›
