What this fault means
Stored data integrity error is a VU security-breach-attempt event. It means the data stored in the 365-day mass memory has been found to be erroneous. On the motion sensor, it may appear as “Stored data integrity error (MS)”.
This fault, stored data integrity error, means the tachograph cannot treat its stored activity data as trustworthy evidence. It sits alongside security violations and hardware sabotage because corrupted data may also indicate tampering. The severity of this fault is Critical.
What to do now
The official workshop instruction for this fault is:
- Decommission and replace the vehicle unit in the tachograph’s stored data.
- Have the vehicle unit replaced at an approved workshop.
There is no requirement to stop driving. Arrange repair as soon as circumstances permit, and keep manual records while the unit is unserviceable.
If the same fault keeps recurring across several vehicles, tachograph analysis software shows it for the entire fleet in one place.
Your tachograph logs this fault — TAGRA reads it
TAGRA does not repair a stored data integrity error — an approved workshop must decommission and replace the vehicle unit. But once the fault is written to the tachograph’s memory, TAGRA finds it in your downloaded data, evaluates it and documents it. Download whatever the unit still releases before replacement: the old tacho leaves with its mass memory, while you still owe the archive.
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According to the manual, this security-breach attempt has one underlying cause:
- the stored data integrity error means data in the vehicle unit’s 365-day mass memory has been found to be erroneous.
- On the motion sensor, Stored data integrity error (MS)means the motion sensor must be replaced.
Because corrupted mass-memory data may be evidence of tampering, this is a security-breach event. An inspector can see it, and the stored activity data is no longer trustworthy evidence.
Can you keep driving?
Yes. This fault is classified as Critical and the vehicle unit must be decommissioned and replaced by an approved workshop as soon as circumstances permit.
Article 37 does not ban driving, but have the tacho repaired as soon as possible, or en route if the vehicle cannot return within one week. Keep manual records while the tachograph is unserviceable. Download any data the tacho still releases before replacement, as the removed unit retains its mass memory and the operator still owes the archive.
Also displayed as
The same fault appears under several wordings depending on where the corrupted data sits. These are the variants recorded in the official event and fault list:
- Stored data integrity error — vehicle unit, 365-day mass memory
- Stored data integrity error (MS) — motion sensor variant, sensor is replaced
- Card data input integrity — different and milder: card communication failed
- 80 00 002452 — integrity error of distance sensor, a separate DTC
Related faults
Frequently asked questions
What does Stored data integrity error mean on a tachograph?
Stored data integrity error is a VU Security Breach Attempt. It means data held in the tachograph's 365-day mass memory has been found to be erroneous, so the stored activity data can no longer be trusted as evidence.
Can I keep driving with a Stored data integrity error?
Yes. Article 37 does not ban driving, but this is a Critical fault. Have the tacho repaired by an approved workshop as soon as circumstances permit, and keep manual records while the unit is unserviceable.
Does Stored data integrity error affect my driver card data?
It affects the vehicle unit's mass memory, not necessarily the driver card. An inspector will see the security-breach event, and the 365 days of tacho activity data behind it are no longer trustworthy evidence.
What should I do if Stored data integrity error keeps coming back?
Download any data the unit still releases before replacement, then have an approved workshop decommission and replace the vehicle unit. For the motion sensor version, replace the motion sensor. The operator must still archive available data.