THE BLUE FEETPorsche Taycan aborting DC fast-charging — the heat-triggered fault the chargers got blamed for
Public DC rapid-charging crawls or quits at random — but only once the battery is warm after a hard drive. Home AC charging is flawless. The owner blamed the public chargers; three different sites told the same story.
What the diagnosis found
The platform cross-referenced every derate against pack temperature and the 800-volt isolation log, and found a single high-resistance HV junction that only opened up once the pack crossed a thermal threshold — collapsing the charge rate while passing every cold self-test.
Ranked probable causes
How the system reasoned
AC charging working while DC fails only when hot is the giveaway: the fault lives on the high-current DC path and is governed by temperature, not state of charge. By correlating each derate with pack temperature rather than the charger, the platform isolated a thermally-sensitive HV joint — invisible to any test run on a cold car.
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