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I was told by onstar diagnostics that driving short distances could drain battery but what about longer distances?
Vehicle: Chevrolet malibu I believe 4 cylinder

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P305F Dual battery isolation performance

When this code set it means the ECM see a lower voltage during cranking , you can have a battery drain and the if it goes below , the start is disabled. If the code clear during the drive , this mean the voltage went to normal. if not , it a very short drive.
asked Jan 14, 2018 by (101 points) Will it effect the emissions?
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P305F CHEVROLET - Dual Battery Control Module Performance

Read more: https://www.autocodes.com/p305f_chevrolet.html

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