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2023 GMC Sierra 1500 — battery dies after the car sits for a weekend — Northern Virginia owner

QuietDaily422Community StarterJun 14, 20262023 GMC Sierra 1500 AT4Northern Virginia
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?
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3 replies

QuietDaily422Community StarterCommunity StarterJun 14, 2026permalink
I checked the easy stuff first on the 2023 GMC Sierra 1500 and found one clue worth chasing before I book a shop.
DailyCommuter815Community StarterCommunity StarterJun 14, 2026permalink
If it were mine, swap the cheap/easy piece first on the 2023 GMC Sierra 1500 and see if the fault follows.
CamberDriverCommunity StarterCommunity StarterJun 15, 2026permalink
One thing that mattered for me: if it is cylinder-specific on the 2023 GMC Sierra 1500, move a coil or plug and see whether the code follows.
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