Siemens VDO DTCO 1381 Technical Description page 258

13.4 Messages and troubleshooting measures
DTCO 1381 display
Picto. AP Error text
1)
These warning messages will be displayed repetitively every hour until the cause is withdrawn.
2)
These warning messages are not saved in the date memory during calibration mode.
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MC Error code Meaning, cause and measures
4000000400 Communication fault with inserted tachograph cards.
4000000500
A communication fault has appeared during reading or
writing of card data.
Measures
– Check the tachograph card's contact points.
– Check tachograph card.
– Check DTCO 1381.
Replace any defective components.
Comment
The inserted tachograph card will be ejected.
© Siemens VDO Automotive AG
Events and faults
Edition 07/2007