This code indicates that the tachograph card in slot 1 (driver 1) was not detected, or could not be read or written during a software upgrade.
What does it mean?
The integrity of the software upgrade module or security key cannot be guaranteed, so the upgrade has been cancelled.
Possible causes:
Driver card not properly inserted or not recognised
Card read/write issue
Fault during software upgrade process
Internal issue
What should you do?
Drivers can be instructed to:
Check that the driver card is correctly inserted in slot 1
Remove and reinsert the card to ensure proper connection
Repeat the software upgrade process
If the issue continues, this is not something that can be resolved at driver level.
Next step:
The vehicle should be referred to an approved tachograph centre for inspection and possible DTCO 1381 replacement.
🔗 Find an approved tachograph centre: https://www.gov.uk/find-approved-tachograph-centre-atc
