Some battery systems support an alternative communication direction around a ring. Continued access to measurements may therefore coexist with a communication-path fault.

What to check next

Read the system’s diagnostic status and identify whether the alternate path is active. Preserve warnings even if the displayed cell data looks complete. A specialist should establish which path has failed and whether the vehicle’s intended redundancy has been lost.

Useful information for an enquiry

Send the full diagnostic record and the conditions that trigger the warning.

Ring capability is design-specific. It must not be assumed for a vehicle simply because a similar monitor device supports it.

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.