Mon – Fri 9:30am – 5:30pm · Sat 10am – 3pm
Advanced fault diagnostics for electric vehicles - ECU/module testing, wiring analysis, HV system fault tracing, CAN-bus diagnostics. From £60.
From
£100
Final quote will be confirmed after vehicle registration and assessment
Estimated 1 hrs
Prices shown are starting prices. Final cost depends on your vehicle's make, model, and condition. We always provide a free estimate before starting work.
EV & Hybrid Vehicle Diagnostics in Dumbarton | Doyen Auto Services
Professional EV and Hybrid Diagnostics in Dumbarton
Electric and hybrid vehicles rely on complex electronic systems to control the high-voltage battery, electric motor, charging system, thermal management, regenerative braking, safety systems and many other vehicle functions.
When a fault develops, the symptoms can range from warning lights and charging problems to reduced performance, reduced driving range or multiple system warnings appearing at the same time.
At Doyen Auto Services in Dumbarton, we use professional diagnostic equipment to communicate with the electronic control modules found in modern electric and hybrid vehicles. Our approach goes beyond simply reading fault codes. We investigate the available diagnostic information, live data, electrical supplies, communication networks and related systems to help identify the underlying cause.
Our EV & Hybrid Diagnostic Services
• High-voltage system diagnostics • EV battery and BMS diagnostics • Charging system fault diagnosis • AC and DC charging problems • Vehicle refusing to charge • Intermittent charging faults • Reduced driving range investigations • Electric motor and inverter-related faults • High-voltage isolation faults • Thermal management and cooling system faults • DC-DC converter diagnostics • On-board charger diagnostics • CAN Bus and communication faults • Vehicle network diagnostics • Warning lights and dashboard messages • Reduced power and performance faults • Regenerative braking system faults • 12V electrical system faults • Wiring and connector faults • Sensor and actuator testing • Module programming and coding where supported • Intermittent electrical and electronic faults
Advanced EV Diagnostics
Modern EVs contain numerous control modules that constantly communicate with one another. A fault within one system can therefore cause several other modules to report secondary faults.
Rather than treating every fault code individually, we investigate the relationship between the different systems to establish where the problem is originating.
Where required, our diagnostic process can include:
• Live-data analysis • Power and earth testing • Wiring and connector inspection • Vehicle network testing • CAN Bus diagnostics • Oscilloscope testing • Electrical signal analysis • Module communication testing • Vehicle-specific wiring diagram analysis
High-Voltage Battery & BMS Diagnostics
The high-voltage battery is one of the most expensive components in an EV or hybrid vehicle. A battery-related warning does not automatically mean that the complete battery pack requires replacement.
Case-by-case pricing. The figures below are starting “from” prices - your final quote depends on your vehicle's make, model, and condition.
Basic EV scan
Advanced EV diagnostics
Live data, oscilloscope, wiring tests
Hourly rates available for complex faults - we'll quote before starting.
We always provide a free, no-obligation quote before any work begins. Call 07760 926245 or WhatsApp 07760 926245.
Here’s what to expect when you bring your vehicle to Doyen Auto Services
We listen to the symptoms, then run a full system scan to capture every fault code.
Live data analysis, oscilloscope work, wiring tests - whatever the fault calls for.
Clear written explanation of what's wrong, what's needed to fix it, and what it'll cost.
We’re a specialist automotive garage in Dumbarton, with the equipment, experience, and honest approach to get the job done right first time.
Manufacturer-level diagnostic kit covering all major EV brands
We've seen most EV faults before - we go straight to the likely cause
Honest second opinions on dealer quotes
Hourly rates available for complex jobs - no surprise bills
Common questions about this service at Doyen Auto Services
Starting from
£75
A comprehensive scan of every module in your vehicle. Find out exactly what's going on - not just the engine, but every electronic system.
Learn moreStarting from
£149
Annual full service for electric vehicles. Battery state-of-health, cooling system, brake fluid, HV cables, software updates - the works. From £149.
Learn moreStarting from
£50
Entry-level health check for electric vehicles - visual inspection of high-voltage components, brakes, tyres, lights and a full diagnostic scan. From £59.
Learn moreStarting from
£250
Specialist HV battery testing, charge port inspection, on-board charger and DC/DC converter checks - keep your range and your charging speeds where they should be. From £109.
Get in touch today to book your ev diagnostics & fault finding at our Dumbarton workshop. Online booking or call us directly.
Unit 8, Levenside Business Court, Dumbarton G82 3PE · Mon–Fri 9:30am–5:30pm, Sat 10am–3pm
The Battery Management System monitors parameters including battery voltage, temperature, state of charge and cell performance.
We can investigate available battery and BMS diagnostic information to help determine whether the issue may be related to the battery management system, sensors, wiring, connections, communication or another component before expensive parts are considered.
EV Charging Fault Diagnosis
If your EV:
• Won't charge • Stops charging unexpectedly • Charges intermittently • Displays a charging warning • Charges slower than expected • Refuses to accept AC or DC charging
Professional diagnosis can help identify whether the fault is within the vehicle's charging system, onboard charger, battery management system, high-voltage system or associated control modules.
EV Communication & CAN Bus Faults
Communication between control modules is critical to the operation of modern electric and hybrid vehicles.
A communication failure can result in multiple warning lights, loss of vehicle functions or several apparently unrelated fault codes.
We can investigate communication faults using diagnostic equipment alongside electrical testing, wiring checks and oscilloscope analysis where required.
Module Programming & Coding
Some repairs require electronic modules to be programmed, coded or configured following component replacement or repair.
Where supported by the vehicle and our available diagnostic equipment, we can perform appropriate programming and coding procedures as part of the repair process.
Independent Second Opinion
Have you been advised by a main dealer that your EV needs an expensive battery, charger, inverter, ECU or other major component?
Before committing to a costly repair, an independent diagnostic assessment can provide additional information about what the vehicle's diagnostic systems are actually reporting.
At Doyen Auto Services, we focus on finding the cause of the fault rather than simply replacing expensive components based on fault codes alone.
Professional EV Diagnostics in Dumbarton
EV and hybrid vehicles require specialist diagnostic knowledge and equipment. At Doyen Auto Services, we use a systematic diagnostic approach to investigate electrical, electronic, communication and high-voltage-related faults.
If your electric or hybrid vehicle has a warning light, charging problem, reduced range, battery warning, communication fault, reduced performance or unexplained electrical issue, contact Doyen Auto Services in Dumbarton to arrange a professional diagnostic assessment.
Doyen Auto Services Ltd Unit 8, Levenside Business Court Dumbarton G82 3PE
Telephone: 0141 467 2904 Mobile: 07760 926245
