AutoNet VIP

EV Battery & High-Voltage Diagnostics in Harlow

Battery and high-voltage faults need specialist diagnosis. A warning light does not automatically mean an entire battery needs replacing, and changing parts before the cause is understood can become very expensive.

AutoNet VIP can evaluate electric and hybrid high-voltage systems, identify faults and advise whether the next step is repair, component replacement or further specialist testing.

High-voltage diagnostic services
  • High-voltage battery diagnostics
  • High-voltage system evaluation
  • Diagnostic reporting / certification where appropriate
  • Battery management system (BMS) fault diagnosis
  • High-voltage contactor and relay diagnosis
  • Pyro-fuse diagnosis and replacement where applicable • DC-DC converter diagnosis
  • 12-volt system diagnosis
  • High-voltage coolant pump diagnosis and replacement
  • Charging and electrical fault investigation

A diagnostic-first approach

The aim is to understand the fault before recommending costly work. We combine electronic diagnostics with system checks so that repair decisions are based on evidence rather than assumptions.

When should you book an EV battery diagnostic?
  • Battery or high-voltage warning shown on the dashboard • Vehicle will not enter ready mode
  • Charging fails or repeatedly stops
  • Unexpected reduction in performance
  • 12-volt battery repeatedly goes flat
  • Cooling system warning
  • A fault has already been diagnosed but you want an independent assessment
  • You need a clearer understanding before committing to a major battery repair
Battery replacement is not always the first answer

Some high-voltage faults relate to supporting components, management electronics, relays, contactors, cooling systems or low-voltage supply rather than the complete battery pack. Accurate diagnosis can help identify the appropriate repair path.

High-voltage work across multiple brands

Our EV and hybrid support covers a broad range of manufacturers. For Tesla vehicles, we also offer a dedicated Tesla battery and high-voltage service covering Model 3, Model Y, Model S and Model X.