A dual-battery isolation module ensures that both batteries are properly charged and that the primary battery always has sufficient charge to start the vehicle. In many 2-battery systems, the auxiliary battery will be located away from the engine compartment, such as in the trunk or under a rear seat.
Why is there a battery in the trunk of my Chevy Impala?
It's generally located under the hood, although some makes and models have the primary battery in the trunk, near the spare tire. This battery's job is simple it provides the electricity needed to start the engine. There's the primary battery under the hood, but there's also an auxiliary battery.
How do you change the battery in a 2014 Chevy Impala?
How much to replace the battery in my Chevrolet? Depending on power, size, and quality, prices for a replacement car battery range from about $45 to $250.
The code p305f meaning on the Chevy Malibu is for dual battery control module performance. This vehicle has two batteries, a primary and a secondary one. The control module is responsible for switching from the first and second one as needed so that one can charge, or so that both can work under heavy load.