Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
There is a factory service bulletin for the following models:
2014-2016 Chevrolet Impala
2014-2016 Chevrolet Malibu
2014-2016 Chevrolet Impala, Malibu Factory Service Bulletin OBDII Code P305F
Condition
There may be several different causes of this code setting and before any component replacements, please follow the recommendations below.
Inspect the Following:
- Inspect for loose unsecured electrical ground.
- Verify the engine harness is not pinched underneath the main battery tray.
- Inspect both main and auxiliary battery cables for being secured.
- Perform the battery inspection/test in SI to the auxiliary battery.
To diagnose the P305F Chevrolet code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
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.
Need more information on how to fix the P305F Chevrolet code? Get Access to Factory Service Manuals
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