Code 34 appears when the tachograph cannot eject the card because certain operating conditions are not met. Most commonly, this happens while the vehicle is moving, during an active data download, or while the tachograph is actively reading from or writing to the card. On ADR versions, the message can also appear if the ignition is switched off. In some cases, the message is shown when a card ejection is requested immediately after the card has been read correctly, such as straight after insertion or following a restart during activation.
Before taking further action, the driver should check whether the vehicle is still in Trip mode and, if so, stop safely before attempting to eject the card again. It is also important to confirm that no data download is currently in progress and, for ADR vehicles, that the ignition is switched on. In many cases, simply repeating the procedure once these conditions are met will resolve the issue.
If the message continues to appear despite these checks, the issue should not be ignored. Operators should arrange for the vehicle to be inspected by an approved tachograph workshop https://www.gov.uk/find-approved-tachograph-centre-at