EV warning occurs only with a trailer connected

A symptom linked to towing equipment needs the trailer and installation history included. Factory equipment and later wiring kits can present different assessment routes.

How to approach the assessment

Tell the workshop which functions fail and whether the car is approved and configured for the equipment in use. Do not disconnect individual safety functions to see whether a warning disappears. The goal is to establish the cause while preserving the vehicle and trailer systems.

Useful details to send

  • Towbar and wiring-kit details.
  • Trailer type and affected functions.
  • Whether symptoms occur without the trailer.

Arrange the right assessment

This is enquiry guidance, not a high-voltage repair procedure. Do not open battery packs or work on high-voltage equipment. Agree the vehicle assessment and transport arrangements with the receiving workshop first.

Ask AXION about your repair or read our EV and hybrid assessment information. Workshop visits are by appointment in Didcot. Confirm suitability before posting any removed module.

Related reading

Browse all EV, hybrid and collision repair guides.

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