Alternator & ChargingQuestionCommunity Starter

Fast charging slows down earlier than it used to

TorqueNomadCommunity StarterMay 26, 20262024 Tesla Model Y Long RangeTexas
2024 Tesla Model Y Long Range, about 118,000 miles. On road trips the car used to hold a higher charge rate longer. Now it starts tapering sooner even when the pack is warm. Could this be charger-side variation, battery temperature, software, or an actual battery-health issue? If I fix it I'll come back and update the thread.
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HybridDriver42Community StarterCommunity StarterMay 27, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2024 Tesla Model Y, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. Then you'll know the next fork. On “fast charging slows down earlier than it,” that was the fork that mattered for me. This is from a 2024 Tesla Model Y in Texas with 118,000 miles. Did the worksheet show tax yet? This is the filter I use when the thread starts repeating itself. Trying not to diagnose from the couch.
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