The high-voltage system
- Full diagnostic scan of the battery management system (BMS), with state-of-health and cell-level voltage data
- Insulation resistance test on the high-voltage cables and connectors
- Inverter and DC-DC converter diagnostic scan
- Motor controller scan
- Regenerative braking system check (one-pedal driving smoothness, regen efficiency)
- On-board charger fault scan
- Software / firmware updates where the manufacturer or third-party tool allows
Cooling system
- Coolant level + condition check (the battery and inverter are liquid-cooled on most modern EVs)
- Top-up or full flush as required
- Pump and pipework inspection for leaks
- Cooling fan operation check
Conventional mechanical checks
- Brake pads + discs (EVs wear them slower due to regen, but moisture and corrosion build faster too)
- Brake fluid moisture test (recommended every 2 years)
- Tyre tread depth, condition, pressure — and a check for the EV-load rating
- Wheel alignment (heavier kerb weight makes EVs sensitive to misalignment)
- Suspension components: bushes, springs, shock absorbers
- Steering: tie-rod ends, CV joints, rack
- Underbody inspection
12V auxiliary + cabin
- 12V battery health and charging system check (a flat 12V is the #1 cause of "won't start" on EVs)
- Cabin air-conditioning + heat-pump performance
- Pollen filter replacement
- Wipers, washers, lights, horn
- Seatbelt + airbag visual check
Related on The EV Pros
FAQs
How long does an EV service take?
90 minutes to 3 hours depending on the make and whether a battery health diagnostic is included.
Will my service include a brake fluid change?
Usually only every 2 years. EV brake fluid lasts longer due to less heat cycling, but moisture still builds up.
Do I need to bring anything?
Your V5, current service record (digital or paper) and your key card / fob.