Inconsistent long term RAM data
No action is needed if DTC is set a few times (1-5). If set frequently, check electrical installation in vehicle for non-certified third party equipment(*) and disconnect these. Thereafter, replace ECU if problem remains. (*) The sensitivity, for equipment with high EMC radiation, is increased in an EMC emitting environment. This could for example be radar stations (airport/military), distribution plants, electrical switch towers, transformer stations, steel works, "electric" welding, etc.
What you'll see
No driver-visible symptom recorded.
System reaction
System reset
Diagnostic depth
A portion of the internal RAM is used to store configuration data. At system start, compressed information is read from a non-volatile memory. The compressed information is expanded and stored in the portion of RAM used for configuration data. After this initial store, the configuration data should be available for reading only. No change of the information is permitted. The consistency of the data is controlled with a checksum. If the checksum test fails, this DTC is set.
Exposure to extensive electro-magnetic radiations Software flaws.