P0A05 – 12v Power Supply Fault

This fault is triggered when the voltage measured by the BMS drops below approximately 9v for 5 to 8 seconds. This code remains set even after the voltage has returned to normal.


Resolving the issue:

Step 1. Ensure that the 12v supply to the BMS remains above 9v.

Note: revision D and newer units can withstand significant voltage transients and brownouts without interruption while earlier revisions are more susceptible to interruptions.

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