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ELE290 BMS DTC Judgement Logic Improvement (P1AA600)

1228 Views 4 Replies 3 Participants Last post by  alansh42
This bulletin provides information to update the software logic of the Battery Management System (BMS) on some 2022-2023MY EV6 (CV) vehicles produced from November 17, 2021 through February 3, 2023 which have a stored DTC P1AA600. The BMS ECU monitors voltage deviation; if over-voltage deviation between battery cells, poor insulation, abnormal cell voltage changes after charging, abnormal current change during charging, over-voltage, low voltage battery temperature deviation or average cell deviation during driving is detected, the BMU sets DTC P1AA600. This BMS DTC logic improvement will expand DTC P1AA600 into multiple DTCs to aid in proper diagnosis, which reduces the required time and steps outlined in the ‘DTC Inspection’ on KGIS to determine the fault using ‘freeze frame’ data (refer to table below).

** This update is also included in ELE291; it does not require a separate update. They both update the BMS software version to 5500 or 5508.


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Interestingly, this TSB isn’t available in Sweden :unsure:
It changes a generic DTC code to be more descriptive of the problem. You don't need it unless you're getting P1AA600. However, the software update for preconditioning includes this fix.
A minor update to the TSB. The dealer is no longer required to get authorization before applying this update.

It's still the same software version, and it's still also included in ELE291.


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