OBD fault memory
Also known as: OBD fault codes · DTC · OBD-Fehlerspeicher
The OBD fault memory is the part of on-board diagnostics that stores a vehicle's standardised trouble codes (DTCs). In the fleet view, open codes show as a warning badge — a pointer to a due workshop check.
On-board diagnostics (OBD) monitors emission- and engine-related systems in a vehicle. When the control unit detects a fault, it stores a Diagnostic Trouble Code (DTC) in the fault memory. DTCs are standardised and start with a system prefix:
- P — powertrain (engine/transmission),
- C — chassis,
- B — body,
- U — network/communication.
In RoadReview the stored OBD trouble codes are transmitted per drive from the RoadReview drive-data system and matched to the vehicle by VIN. In the fleet view a red badge shows the number of open codes plus “last seen”; a detail card lists the code, its frequency and first/last occurrence.
An important boundary: only fault-memory codes are read. RoadReview does not read an odometer value from the vehicle, shows no individual warning lights, no tyre pressure and no roadworthiness (TÜV/HU) dates — there is no manufacturer / connected-car link for that.
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