Battery-monitor electronics may communicate along a chain. One interruption can affect access to several downstream devices, so a list of missing units does not necessarily mean they all failed.

Interpreting the evidence

Use the actual system architecture to map which devices remain reachable and which disappear together. Compare that pattern with the fault timeline and recent work. This gives a more useful starting point than ordering multiple monitor boards from a scan list alone.

Keep this evidence

Include the complete battery-system scan and the sequence of units reported unavailable.

Internal battery communication is a specialist high-voltage investigation. Vehicle CAN checks alone may not test the monitor chain inside the pack.

Speak to AXION

For EV and hybrid diagnostic assessment, send your vehicle details and fault report. Workshop assessment is in Didcot, Oxfordshire. Suitable postal or remote work is confirmed before booking.

Technical background from Texas Instruments. The referenced design explains the principle; the vehicle-specific procedure determines the repair.