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2024 Acura MDX — battery dies after the car sits for a weekend

BoostHunter990Community StarterJun 3, 20262024 Acura MDX Type SWestchester
2024 Acura MDX Type S, about 27,500 miles. Battery passes a quick test and charging voltage looks normal, but after two or three days parked the car sometimes will not crank. What is the cleanest parasitic-draw test on a modern car that takes time to go to sleep? I am in Westchester. I would rather test this logically than replace parts.
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4 replies

OldSchoolShopperCommunity StarterCommunity StarterJun 3, 2026permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2024 Acura MDX so service can see what you saw. That's where I'd start. This is from a 2024 Acura MDX in Westchester with 27,500 miles. Verbal 'we'll take care of it' is not a plan. I'd rather be boring and correct. This is me being the wet blanket on purpose.
HighwayDetailer589Community StarterCommunity StarterJun 3, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2024 Acura MDX, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. That's where I'd start. On “battery dies after the car sits for,” that was the fork that mattered for me. Did the worksheet show tax yet? I'll update if anything new shows up.
ProjectNomad253Community StarterCommunity StarterJun 3, 2026permalink
I'd treat 12V warnings as a no-ignore. On the 2024 Acura MDX, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. That's where I'd start. On “battery dies after the car sits for,” that was the fork that mattered for me. Write the result down so the next test isn't a repeat of the last one. This is the filter I use when the thread starts repeating itself. If it repeats twice more I'll book time.
BoostHunter990Community StarterCommunity StarterJun 4, 2026permalink
Tried a second charger / second scan and the story on the 2024 Acura MDX didn't change. Heat soak after errands is the other window.
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