2005 Hyundai Coupe 2 lt Battery drainning

Problem added: Jul 7, 2020 (3 weeks ago)
within 48 hours the battery goes from fully charged to zero.... door locking system not working properly as it sometimes continues to operate on and off when driving. could this problem be drainning battery overnight? I have checked everything else is OFF. thank you for any advice. Ciaran

Car details
Car: Hyundai Coupe
Variant: 2 lt
Model Year: 2005
Category: Electrics, ECU, Warnings & Lights

Recalls: Hyundai Coupe Recalls
More: Hyundai Coupe Problems
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Fixes: 12,473
Jul 7, 2020 (3 weeks ago)
Could be weak / dud cell in battery which means it wont hold a charge . Get it LOAD tested . If not that , check for a parasitic drain .
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