The high-voltage system includes more than the battery. A reported insulation problem needs to be located within the actual connected system before a major component decision is made.
What to check next
Review the complete fault record and operating state, then follow the vehicle’s approved diagnostic sequence. Evidence should explain why a particular circuit or component is implicated. This matters when a replacement estimate names the battery without showing how other connected loads were assessed.
Useful information for an enquiry
Send the full diagnosis and any written test results accompanying the estimate. Our EV and hybrid BMS assessment page explains the battery-system information to include before booking.
Do not continue charging or driving against the vehicle’s warning instructions. The next safe action depends on the exact message and condition.
Speak to AXION
For EV and hybrid diagnostic assessment, send your vehicle details and fault report. Workshop assessment is in Didcot, Oxfordshire. Contact us first to agree the assessment and vehicle arrangements; do not send a traction battery by ordinary post.
Technical background from Bender. The referenced design explains the principle; the vehicle-specific procedure determines the repair.
Related reading — EV charge-control signalling and energy conversion are separate stages. Browse all vehicle-electronics diagnostic notes or return to the repair library.