Negative response code 0x73 concerns the block sequence counter during a data transfer. It points to the exchange sequence rather than directly identifying a damaged vehicle component.

Interpreting the evidence

Review the complete transfer log for retries, interruptions or a restarted session. Confirm that the supported tool and interface are being used with the correct software. The diagnostic aim is to establish how the sequence became inconsistent before another attempt.

Keep this evidence

Include the tool and interface versions and the point at which transfer stopped.

Do not edit transfer blocks manually or bypass the approved update process. Recovery must follow the controller’s supported procedure.

Speak to AXION

For module programming and coding support, 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 py-uds. The referenced design explains the principle; the vehicle-specific procedure determines the repair.