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Discussion Starter · #1 ·
2014 Malibu LTZ. Battery was dead this morning. Finally started after charging a while. Check engine came on and set a Code P305F. Battery checked good, and, alternator checked good once, and, bad once. What does the code mean?
 

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Which engine? 2.5 has 2 batteries, 2.0 only one. Both batteries need to be checked if you have a 2.5 engine before looking at the battery module.
What is P305F CHEVROLET code meaning?
This system uses a dual battery configuration which includes the 12 V primary battery and 12 V auxiliary battery. The dual battery control module switches the 12 V primary battery and 12 V auxiliary battery in and out at appropriate times to support vehicle loads and battery charging. During engine crank, the auxiliary battery is switched in to supply voltage to the vehicle loads (except the starter motor which receives voltage from the primary battery) and the ECM monitors the auxiliary battery voltage through the IGN input.
 

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Discussion Starter · #5 · (Edited)
Further examination has determined that it’s the primary battery. Looks like a job to install. Any special precautions I need to take ?
 

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Further examination has determined that it’s the primary battery. Looks like a job to install. Any special precautions I need to take ?
Negative cable comes off battery first then positive. Don't let positive cable touch any part of the car since it's a dual battery vehicle. Negative onto battery last.
 
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