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
Electric and hybrid vehicles use highly advanced electronic systems to control the high-voltage battery, electric motor, charging system, thermal management, braking systems, safety systems and numerous other vehicle functions.
When something goes wrong, the symptoms can be very different from those found on a conventional petrol or diesel vehicle. You may see a warning message, experience a charging problem, notice reduced driving range, lose a vehicle function, experience reduced performance or have multiple warning lights appear at the same time.
Proper diagnosis requires specialist equipment and knowledge of EV and hybrid vehicle systems. A basic generic code reader may only provide limited information and may not be able to communicate with all of the vehicle's control modules.
At Doyen Auto Services in Dumbarton, we use professional diagnostic equipment designed to communicate with the electronic control systems found in modern electric and hybrid vehicles. This allows us to investigate faults across multiple modules rather than concentrating on a single control unit.
Our EV and hybrid diagnostic services can include:
• High-voltage system diagnostics • EV battery and Battery Management System (BMS) diagnostics • Charging system fault diagnosis • AC and DC charging problems • Vehicle charging refusal • Reduced driving range investigations • Electric motor and inverter-related faults • High-voltage isolation and system faults • Thermal management and cooling system faults • DC-DC converter faults • On-board charger diagnostics • Communication faults between control modules • CAN Bus and vehicle network faults • Warning lights and dashboard messages • Reduced power and performance problems • Regenerative braking system faults • 12V electrical system problems • Wiring and connector faults • Sensor and actuator problems • Module programming and coding where supported • Intermittent electrical and electronic faults
Advanced EV Diagnostics
Electric vehicles contain numerous interconnected control modules that constantly exchange information over the vehicle's communication networks.
A fault in one system can sometimes cause several other modules to report communication or system-related faults. This can make diagnosis particularly challenging if the fault codes are viewed individually without understanding how the systems interact.
We analyse the vehicle's complete diagnostic information and investigate the relationship between the different systems to identify the underlying cause.
Where necessary, we can carry out additional electrical testing, examine live data, check power and earth supplies, inspect wiring and connectors, and use an oscilloscope to analyse electrical signals and communication networks.
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
High-Voltage Battery and BMS Diagnostics
The high-voltage battery is one of the most important and expensive components in an electric or hybrid vehicle. Battery-related warning messages do not automatically mean that the entire battery pack needs to be replaced.
The Battery Management System monitors battery voltage, temperature, state of charge, cell performance and other operating parameters. A fault may be caused by a battery management issue, sensor, connection, wiring fault, communication problem or another component within the system.
We can investigate battery and BMS-related faults and determine what information is available from the vehicle before major components are considered for replacement.
EV Charging Fault Diagnosis
Charging problems can be caused by several different systems. If your vehicle refuses to charge, stops charging unexpectedly, charges intermittently or displays a charging-related warning, professional diagnosis may be required.
We can investigate faults involving the vehicle's charging system, onboard charger, charging communication, battery management system, high-voltage system and related control modules.
Where appropriate, we can also investigate whether the issue is associated with the vehicle itself or another part of the charging setup.
EV Communication and CAN Bus Faults
Modern EVs rely heavily on communication between electronic control modules. If communication is interrupted, several systems may stop operating correctly or multiple warning messages may appear.
Using professional diagnostic equipment and electrical testing methods, we can investigate communication faults, network errors, wiring problems and module-related issues.
When required, wiring can be checked using vehicle-specific wiring diagrams, electrical measurements and oscilloscope testing to establish whether the problem is caused by the wiring, network, power supply or control module.
Module Programming and Coding
Some EV and hybrid faults may require module programming, coding, configuration or software-related procedures after a component has been replaced or repaired.
Where supported by the vehicle and diagnostic equipment, we can carry out appropriate programming and coding procedures as part of the diagnostic or repair process.
Second Opinion on Expensive EV Repairs
If you have been advised by a main dealer that your EV requires an expensive battery, charger, control module or other major component, it can be worthwhile obtaining a professional second opinion before committing to the repair.
We can carry out an independent diagnostic assessment and explain what the available diagnostic information shows.
Our approach is based on identifying the actual fault rather than automatically replacing expensive components or recommending unnecessary work.
Professional EV Diagnostics in Dumbarton
At Doyen Auto Services, we understand that EV and hybrid faults require a different approach from conventional vehicle diagnostics.
Our aim is to provide accurate fault finding, clear explanations and practical repair advice based on the condition of the vehicle and the evidence available from the diagnostic process.
If your electric or hybrid vehicle has a warning light, charging problem, reduced range, communication fault, battery-related warning or unexplained electrical issue, contact Doyen Auto Services in Dumbarton to arrange a professional diagnostic assessment.
