⚡ High‑Voltage or Isolation Fault Triggered? Mobile EV & PHEV Specialist in London
HV Safety Fault Diagnostics • Isolation Testing • On‑Site Repairs Across Greater London
A high‑voltage or isolation fault is one of the most serious warnings an EV or plug‑in hybrid can display. When this fault is triggered, the vehicle shuts down charging, disables the drivetrain, or locks out high‑voltage components to prevent electrical risk.
These faults require a trained EV specialist — not a general mechanic.
As London’s dedicated mobile hybrid & EV technician, I diagnose and repair HV and isolation faults at your home, workplace, roadside, or charging hub.
No towing. No delays. No guesswork.
🔧 Specialist Repair for High‑Voltage & Isolation Faults
This applies to all EVs and plug‑in hybrids, including: Tesla, Nissan, Kia, Hyundai, BMW, Mercedes EQ, VW ID, Renault, Peugeot, Vauxhall, Toyota, Lexus, Audi, Jaguar, Volvo, Polestar, MG, BYD, Mitsubishi, Ford, Land Rover, and more.
Common Symptoms
- “High Voltage System Fault”
- “Isolation Fault Detected”
- “Electrical System Malfunction”
- “Service EV System”
- Vehicle refuses to charge
- Vehicle won’t go into Drive
- Charging stops immediately
- Rapid charging fails to start
- Warning appears after plugging in
Typical Causes (Diagnosed On‑Site)
- Moisture intrusion in HV components
- Damaged HV cables or connectors
- Failing OBC (On‑Board Charger)
- DC‑DC converter internal fault
- HV battery isolation breakdown
- BMS detecting unsafe voltage leakage
- Charge port contamination or water ingress
- HV contactors not closing
- 12V battery voltage collapse during HV checks
- Software lockout after failed charging attempt
On‑Site Repairs & Solutions
- Full EV/PHEV diagnostic scan
- HV insulation resistance testing
- Charge port inspection & cleaning
- HV cable and connector checks
- 12V battery replacement (EV‑safe)
- Software resets & module calibrations
- HV system resets
- BMS, inverter, OBC, DC‑DC converter fault tracing
- Moisture detection & drying procedures
- Charging compatibility testing
🚗 Why EV & Plug‑In Hybrid Drivers Across London Choose This Service
True EV & PHEV Specialist
Deep knowledge of HV and isolation‑fault systems across all brands.
Fully Mobile
I come to you anywhere in Greater London — home, work, roadside, or charging hub.
Dealer‑Level Diagnostics
OEM‑grade tools, EV‑safe procedures, and high‑voltage certification.
Transparent Pricing
Clear quotes before work begins.
Fast Response
Same‑day or next‑day appointments available.
📍 Coverage Area
All London boroughs, including: Central London, North London, South London, East London, West London, Croydon, Bromley, Barnet, Enfield, Ealing, Hillingdon, Kingston, Richmond, Wandsworth, Lambeth, Lewisham, Greenwich, Hackney, Camden, Islington, Haringey, Brent, Harrow, Redbridge, Newham, Barking & Dagenham, Havering, Sutton, Merton, Hounslow, Tower Hamlets, Kensington & Chelsea, Westminster.
📞 Book Your High‑Voltage Fault Specialist
If your EV or PHEV has triggered a high‑voltage or isolation fault, I’ll diagnose and repair the issue quickly and safely.
Call / WhatsApp: 07448 457247 Fast mobile EV & PHEV diagnostics anywhere in London.