A timeout means the expected exchange did not complete within the tool’s timing. A negative response is an actual reply explaining why a request was not completed as asked.

What to check next

Preserve the precise error wording and raw log where available. Establish whether any response was received and whether the failure occurred at transport or application level. This helps direct the next check towards timing, connection, prerequisites or the requested operation.

Useful information for an enquiry

Include the full error, operation and interface details.

Do not collapse all communication errors into a single no-communication diagnosis. The distinction can change the appropriate repair path.

Speak to AXION

For CAN-bus and vehicle-network diagnostics, 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 python-can-isotp. The referenced design explains the principle; the vehicle-specific procedure determines the repair.