P305F Chevy Malibu

P305F Chevy Malibu – What Does Chevrolet Code P305F Mean

P305F Chevy Malibu could only appear as a collection of numbers if you don’t know what they mean. Owners and mechanics of Chevy Malibu vehicles have found On-Board Diagnostics, or OBD, to be very helpful in troubleshooting issues.

What does P305F Chevy Malibu mean then?

Simply put, your dual battery control module is malfunctioning. More specifically, you should probably check the tiny battery in your car’s trunk.

What should I do about that, and why is there a second battery in the trunk in the first place? These are likely your current questions.

We address the queries below, along with a step-by-step explanation of how to handle code P305F Chevy Malibu. Read on.


P305F Chevy Malibu

One of the most common OBD2 error codes is this one. To learn what it means, how to fix it, and what other codes might show up in connection with it, keep on reading…


“OBD-II code P305F stands for Dual Battery Control Module Performance.”

A P305F code is a diagnostic trouble code (DTC) that is manufacturer-specific and indicates that a system uses a dual battery configuration with a 12 V primary battery and a 12 V auxiliary battery.

Most Chevrolet models, including the Malibu and Impala, have this code.

To support vehicle loads and battery charging, the dual battery control module alternates between the two in and out at the appropriate times.

At the beginning of the engine turn, the auxiliary battery activates to supply voltage to the loads in the vehicle (except for the starter motor, which receives electricity from the primary battery).

Through the input IGN, the ECM keeps track of the voltage in the auxiliary battery. P305F Chevy Malibu is set if the signal is outside of the range.

P305F Chevy Malibu – Why Does The Chevy Malibu Have Two Batteries

The Chevy Malibu has an automatic shutoff function. Your engine will automatically shut off to conserve fuel, fluids, and wear and tear if you’re idling for a lengthy period of time or if certain other conditions are met.

This increases the number of miles your Malibu can travel.

Your car will use the main battery to do that when it restarts.

While your primary battery sends all of the power to the engine to start it, the second battery keeps your interior lights, radio, and other electronics running.

A useful little feature to ensure you don’t miss your favorite song while your car restarts, it is a basic quality-of-life issue.

The trunk is simply a convenient location for a small battery that is out of the way, which is why it is there (as is the case when you’re trying to perform a battery replacement on a Prius, or are wondering about where’s the battery in a Toyota Prius).

P305F Chevy Malibu – I’m Getting Code P305F, What Do I Do

Either your trunk battery or the wiring around your primary battery could be the source of the issue.

Look under the hood for any loose or missing parts before purchasing a new trunk battery. What you seek is as follows:

  1. An exposed loose ground directly in front of your main battery.
  2. Make sure your vehicle’s body is not rubbing against the wiring harness near your battery.
  3. You might discover that the fuse nuts are loose underneath the fuse block.
  4. This video (attached above) will show you exactly where to look and what to look for if you’re having trouble locating any of these parts.
  5. If everything appears to be in working order, pop the battery panel by opening the trunk. Testing the battery will be the next step if it hasn’t somehow come undone.
  6. You can loosen the nut using a ten-millimeter nut drive. The mounting bolts should come first, then the cables.
  7. After removing the battery and the vent tube from the battery’s back right corner, remove the cables, starting with the negative.
  8. You can check the battery if you have a battery tester. To find out more, head over to our write-up on how to test a car battery.

The most common cause of P305F Chevy Malibu, if there isn’t an issue with the engine, is a bad auxiliary battery, so replacing it is probably the best course of action if you can’t test the battery.

Dual Battery Control Module

P305F Chevy Malibu – Condition/Concern

The Engine Control Module (ECM) of some 2014–2016 Malibu models with the 2.5L 4-cylinder engine (RPOs LKW, LCV) may also have the following DTCs set and an illuminated Check Engine MIL: Performance of the P305F Chevy Malibu Dual Battery Control Module

P305F Chevy Malibu – System Description

A primary battery is located in the front of the vehicle, and an auxiliary battery is located in the back.

When necessary to support vehicle loads and battery charging, the dual battery control module switches the primary battery and the auxiliary battery in and out.

With the exception of the starter motor, which receives power from the primary battery, the auxiliary battery activates during engine cranking, and the ECM tracks the voltage of the auxiliary battery via the IGN input.

P305F Chevy Malibu – Code P305F Meaning

Through the IGN input, the ECM keeps track of the voltage of the backup battery. To learn more about the latter, do check our guide on how many amps is a 12-volt battery. The PCM sets code P305F Chevy Malibu and illuminates the MIL if there is a discrepancy with the registry values.

P305F Chevy Malibu – Causes And Diagnostics

  1. A loose ring terminal at the negative battery terminal is one of the possible causes.
  2. A defective front or back battery.
  3. Reduced battery power (Charge).
  4. The battery harness is open or shorted.
  5. The battery circuit’s electrical connections are subpar.
  6. Female terminal pins in the 4-pin connector with corrosion or fretting.
  7. A problematic module for isolating the two batteries.

P305F Chevy Malibu

To try and diagnose this, you should:

  1. Obtain a battery check and replacement if necessary.
  2. Inspect and tidy up all grounds.
  3. Check for component connector terminals that are damaged, bent, or pushed out, or if you have any battery terminal corrosion.
  4. Inspect the associated wiring harness visually and check all aftermarket additions.
  5. Replace the DBIM (dual battery control module) if none of these conditions are present. The Battery Distribution Fuse Block and wiring harness connector must be replaced because the DBIM is situated on the fuse block assembly.

P305F Chevy Malibu – Auxiliary Battery For A 2015 Chevrolet Malibu

How much does an auxiliary battery replacement cost? Based on available data, an auxiliary battery replacement on a Chevrolet Malibu typically costs $247, which includes $152 for parts and $95 for labor.

Prices may vary based on your location.

But, what is the purpose of the auxiliary battery?

Most passenger cars on the road today have just one large battery. You can typically find the primary battery under the hood, though some makes and models may have it in the trunk next to the spare tire.

This battery’s simple job is to provide the engine with the electricity it needs to start. All additional power that you need during operation to run the radio, signal lights, and other accessories is provided by the alternator.

However, some vehicles have multiple batteries, most notably high-end luxury cars. A primary battery and an auxiliary battery are located underneath the hood.

You cannot directly power additional automotive systems that require 12 volts of power from the alternator. These will power them.

In these circumstances, the alternator is required to charge both the primary and auxiliary batteries.

Role Of The Auxiliary Battery

The auxiliary battery powers some or all of the car’s accessories while the primary battery supplies voltage when the engine is running.

Like other batteries, auxiliary batteries will eventually degrade or stop functioning. If this happens, you will need to replace them.

Remember: You can check your auxiliaries batteries while performing maintenance, but you’ll need to work with a mechanic who is familiar with your car’s configuration.

A dead accessory battery will typically not prevent you from driving, but it will result in problems like broken accessory features.

Batteries vary greatly in size, location, and cost between vehicles.

How to do it:

  1. The auxiliary battery needs to be changed, it has been determined. Accessories are removed when access is needed.
  2. Cut the power and remove the bad auxiliary battery.
  3. After the battery connections have been cleaned, the new auxiliary battery is mounted, fastened, and connected.
  4. Any accessories that were removed to gain access should be put back in. The auxiliary battery’s operation is investigated.
  5. The vehicle is tested to make sure the auxiliary battery is operating properly.

Using your battery frequently causes it to deteriorate over time. It will eventually crumble completely. This is only an estimate, though. Five to seven years is the typical lifespan.

The rest of your system will be under stress when your auxiliary battery fails, and some of your accessories might not work at all or not in a reliable way.

Obtain a professional diagnosis from skilled mechanics because electrical problems aren’t always the result of a dead battery.

What typical signs point to the possibility that the Auxiliary Battery needs changing? Well, these include:

  • The dash’s AUX Battery light is on.
  • Inadequate performance of some or all accessories

P305F Chevy Malibu – How Significant Is This

Even though a dead auxiliary battery won’t prevent your car from moving, it can still cause serious problems, such as important accessories malfunctioning or not working at all.

It might also put more strain on the other components of your charging system. You should change the auxiliary battery as soon as possible.

Bad Auxiliary Battery Symptoms

Most diesel engines need two batteries because there are so many different parts that need power.

The main battery, which operates continuously, will trickle charge the primary auxiliary battery.

When the primary battery runs out, the auxiliary battery will take over and keep the car charged as needed.

Like the main battery, the auxiliary battery will eventually start to have issues and will need replacing.

Usually, these batteries give you enough advance warning before needing to be replaced. Prior to your batteries running out and leaving you stranded on the side of the road, it’s critical to pay attention and act.

Without a properly functioning charging system, a car won’t be able to run as it should.

1. The Vehicle Won’t Crank

You won’t be able to start the car when you need to if your battery is dead. Normally, the car will start up after being jumped, but it will quickly shut off after turning off.

This is because the vehicle’s alternator provides it with the necessary charging while the engine is running.

The battery’s cells won’t be able to maintain a charge after the alternator stops, so they will shut off.

2. Noticeable Leaks Around The Battery

The fluid in the battery of your car is crucial because, without it, the battery’s cells will burn out.

You must act quickly to have the battery replaced if you start to notice that this liquid is leaking out.

The corrosion that this battery fluid can cause makes it dangerous to get it on other engine components.

3. The Battery Light Is On

A fully charged battery will allow all of the components of a vehicle to function properly. When the battery lacks a full charge, there are several things that wouldn’t work or will only perform below full capacity.

The Battery Light will usually come on when there is an issue with the charging system of a car.

Getting both the battery and alternator checked will help you to narrow down where the problem lies.

Chevy Malibu Problems

Do you have the Chevrolet Malibu in mind? If so, you should be aware that the mid-size sedan is reasonably priced, comfortable, and has good handling.

We previously discussed the Chevy Malibu’s lifespan, the common problem that many Chevy Malibu owners face, in addition to the Chevy Malibu model years to avoid, as well as some interesting information and figures about the various Malibu models.

Elsewhere, our previous discussions also included listing the motor oil type used in the 2013 Chevy Malibu, as well as the ‘service ESC’ error message noted on the Chevy Malibu.

It’s time to examine some of the most prevalent issues that people encounter.

But like all vehicles, it has a few well-known problems.

1. Failed Passlock Sensor

A common complaint involves the pass lock sensor failing in Chevy Malibu models from 1997 to 2016.

When this sensor malfunctions, the car may not start, and you might encounter other odd issues.

It might be impossible to start the car with either of these problems.

Probable Causes And Solutions

Usually, to fix the issue you’ll only need to replace the ignition lock cylinder as well as the Passlock sensor.

Otherwise, you could also consider trying to permanently disable the GM Passlock system altogether.

2. Power Door Lock Problems

The 2009 Malibu is the model that experiences power door lock issues the most, but other models have also been affected.

Locks that won’t unlock or lock on command are symptoms of this issue.

The keyfob and manual attempts to lock or unlock the doors will both fail.

The issue typically arises during the sweltering summer months. The windows will work again when it gets cooler outside.

However, in the interim, you won’t be able to lock the car and the anti-theft system could malfunction.

Probable Causes And Solutions

The most common cause of doors that don’t lock or unlock when they should is a broken door lock component.

The issue can be resolved by replacing the broken door lock part.

If the problem isn’t fixed, you might end up locked out of your car or unable to start it because of a security problem (you can learn more in our guide on how to get into a locked car as well as how to unlock car with keys inside).

If you need a more extensive guide, head over to our write-up on troubleshooting a faulty door lock actuator.

Should you be concerned with how to disengage the anti-theft system, as well as how do I get my car out of anti-theft mode, our explainers there might help.

3. Turn Signal Switch Failure

The hazard or turn signal lights may continue to flash after the turn signal switch has been turned off.

Most Malibu models from 1997 to 2006 and the 2010 model have the issue.

By moving the signal switch, the problem can be momentarily fixed, but it won’t be resolved. Additionally, it might keep happening sporadically.

Probable Causes And Solutions

The turn signal switch needs to be changed in order to solve this issue effectively. The problem will gradually happen more frequently once it starts.

The turn signal could eventually stop functioning altogether.

4. Broken Front Coil Spring

1999 Owners of the Chevy Malibu have complained about turning noises that bang and clunk. The sound might also be heard when you abruptly accelerate or stop.

It is an alarming noise that must not be disregarded.

Probable Causes And Solutions

Your Chevy Malibu’s front coil springs may be having a problem if you hear banging or clunking noises coming from them. You can be certain that a qualified mechanic can identify the issue for you.

If this is what’s making the noise, changing the front coil and struts should take care of the problem. Just be wary of the cost of a replacement coil spring.

5. Headlights Burning Out Quickly

The headlights on the 2009 Chevy Malibus frequently burn out and have problems with the low beams.

The issue may develop gradually or suddenly. There are a few possible causes for this.

And if you need to know how much is a headlight bulb, we’ve covered that, too.

Probable Causes And Solutions

Check first the headlight assembly or switch and wiring harness connector on the sedan.

Both of these parts are prone to shorting out or having loose wires.

Usually, replacing these parts will take care of any issues with the low-beam lights or the headlights wearing out too quickly.

You might end up without lights if you don’t fix the issue isn’t.

6. Power Steering Malfunctions While Driving

Around 81,000 miles into their ownership, 2004 Malibus owners began to experience power steering issues.

Drivers reported that while driving, the power steering would occasionally fail or stop working altogether.

If the power steering fails, driving the Malibu might be challenging and risky.

Probable Causes And Solutions

Checking the power steering fluid is the first thing a Malibu owner should do if they suspect a power steering issue.

Who knows; you might be experiencing the symptoms of a power steering fluid leak. If so, you might find our detailed guides on whether can you use power steering fluid as brake fluid, as well as whether can you use transmission fluid for power steering fluid handy.

If the power steering fluid is in good condition but the issue persists, there may be a more serious power steering problem.

You should change the steering column as the best solution to this problem.

Another component that’s worth checking to make sure it’s working fine is the symptoms of a bad power steering pump. If so, you might then have to consider the cost of a replacement power steering pump.

7. Key Stuck In Ignition

The key getting stuck in the ignition is a frequent problem with Chevy Malibus models with automatic transmissions from 1997 to 2016. Usually, the issue arises after 100,000 miles.

We’ve also covered similar and relevant issues before, such as when your key won’t turn in the ignition, or if you’re wondering about how to turn the ignition without a key.

You won’t be able to lock the car and the security system of the car may malfunction if the key is stuck in the ignition.

Probable Causes And Solutions

It might be an issue with the automatic transmission shifter if the ignition key becomes stuck in the ignition lock cylinder.

The ignition lock cylinder needs replacement (bearing in mind the cost to replace the ignition lock cylinder) the most frequently for this sedan.

You should get a diagnosis from a professional if the key keeps sticking in the ignition.

8. Unexplained Check Engine Light Due To Gas Cap Issue

Nobody likes to experience an unexpected check engine light on. Some owners of Chevy Malibu models from 1997 to 2016 have reported an unexplained engine check at around 90,000 miles.

You can explain the check engine light code by a quick diagnostic test.

A loose or worn-out gas cap is one typical issue that sets off this light. This is otherwise referred to as the gas cap check engine light.

Probable Causes And Solutions

A worn-out gas cap is one cause of an unexplained check engine light in a Malibus that satisfies the criteria.

Usually, changing the gas cap will solve the problem. If the gas cap is loose, the light might suddenly come on as well.

The first thing you should do if your check engine light is on the gas cap is to take it off and then tighten it back on.

The cap might not be in properly if the engine check light comes on right away.

For more insight on questions such as what to do when the check engine light comes on, or how to reset a check engine light, why the check engine lights comes on and off, why is the check engine light flashing, as well as how to turn off the check engine light, do refer to our resources attached there.

9. Engine Power Reduced Warning

Malibu drivers have reported a sudden loss of power followed by an “engine power reduced warning” on the dash. Lack of acceleration or a complete loss of power could be the issue.

For more detailed clarification, you can check out our guide on the ‘engine power reduced’ issue on the Chevy Silverado, as well as the ‘engine power reduced’ problem on the Chevy Malibu.

P305F Chevy Malibu

The car problem is simple to fix but can be frightening when it occurs, especially when turning in an intersection or merging onto a highway.

Probable Causes And Solutions

This issue, in accordance with Chevrolet, is related to a flaw in the electronic throttle control and accelerator pedal sensor. These car components connect by a cable, in contrast to older Malibus.

A complex network of wires powers the system which could fail electrically.

You can resolve the issue by changing the defective electrical components.

If the issue is with the throttle control, a diagnostic test can reveal this.

10. Delayed Acceleration Problems

A noticeable delay in acceleration is not only annoying, but it can also be risky.

These are situations where your car hesitates when accelerating from a stop.

You must rely on your Malibu to accelerate quickly enough to get you in your lane when you need to merge onto a freeway.

Probable Causes And Solutions

Malibu may experience throttle lag for a number of reasons. You can narrow down the issue and determine whether adding another throttle controller will solve it by going to a Chevrolet dealership for a diagnostic test.

Adding an additional throttle controller has helped some drivers solve the issue.

To solve the issue, some people replaced the throttle wire controller.

Chevrolet problems reliability

Frequently Asked Questions

What Does The Battery Control Module Do

The hybrid battery control module’s job is to continuously determine the high-voltage battery’s state of charge in a hybrid car. The high-voltage control unit uses this data to decide whether to charge or discharge the high-voltage battery after receiving it.

Meaning Of Battery Saver Active On Chevy Malibu

The Chevrolet Malibu’s “battery saver active” indicator denotes a critical voltage drop in the electrical system. Vehicles typically operate at 13+ volts with the engine running or 12 volts when the vehicle is stationary. The level has fallen below 11.7 volts.

Are Chevy Malibus Good Cars

The Chevy Malibu model can last much longer than owners may anticipate if they take proper care of it, according to websites like RepairPal and J.D. Power. This model received a reliability rating of four out of five from RepairPal, and the 2021 edition received an estimated reliability score of 89 out of 100 from J.D. Power.

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