CHEVY MALIBU P305F DUAL BATTERY FAULT DIAGNOSIS PART 1

In today's case study we are working on a 2014 Chevrolet Malibu LT with a 2.5L Ecotech 4 cylinder engine. The customer complaint is that the check engine light is illuminated. Using a scan tool we were able to find trouble code DTC P305F DUAL BATTERY CONTROL MODULE PERFORMANCE, stored in the ecm. After doing some research we find that there is a TSB or technical service bulletin for this code TSB # 18-NA-367. We also learn that this vehicle is equipped with 2 batteries. One primary battery under the hood and an auxiliary battery in the trunk. We also find that the vehicle is equipped with start and stop feature which shuts the engine off during idle. Follow along as I take you step by step through my diagnostic and troubleshooting procedure. We will also use the system description to learn how this system works, so that we can fully understand it.
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Thank you for watching!

[@ADVANCEDLEVELAUTO]

In part 2, we will cover how the module works and how we can test it. Thank you for watching!

[@85Noerdz]

I changed this unit out brand new and still having the same problem.... what next please help!!

[@realrecognizereal7381]

@@85Noerdz Man I did the same thing.I changed that little battery in trunk.A month or so later.. the dam check engine light came on a again.So get it checked out.And that P305F code pops up again.After I had just bought that little battery brand new.....

[@gabrielrivera3928]

Show me images of a dodge charger how to removed heads

[@deandoss2105]

Is part 2 out ?

[@got2getit204]

@@85Noerdz it’s your crank sensor buy the starter which tells the starter to start when you take your foot off the gas when it gose bad you have a kind of jerkyness when driving and a rattling noise upon cold starts only i knew it wasn’t my batteries and keep in mind it won’t throw a code ask me how I know a lot of money to find out that!

[@orangejuice4332]

Module check starts at 32:00. Great information and video.

[@ivandrago2557]

So much effort you are really trying to explain. There are only few channels with that much work for learning. This one is on top

[@renemontez1282]

Have a 2016 Impala. Same code and issue. Replaced the dual battery control module after seeing this video. Code gone and no more issues. Thanks for putting out this video

[@kaisavage3008]

Where did you get the party for your 2016 Chevy Impala

[@TheShop10]

Firing the old parts cannon..eh! Just kidding, that was a very in depth diagnosis and one that 99% of other shops wouldn't have done. This is my favorite channel next to South Main Auto.

[@ADVANCEDLEVELAUTO]

Sometimes we gotta dust off the old parts cannon lol

[@8953147]

Thanks for taking the time to help us understand this system under a huge workload!!

[@The1979B]

cant wait for part II !!! dont care if this was a long video its always good to see the hold process...

[@ADVANCEDLEVELAUTO]

I’m working on it now. Thanks for watching!

[@themadtahder6986]

This is a well constructed step by step analysis of a single code. Unlike other videos on KZbin basically saying I found this. This gives logic and diagnosis to an identified problem vs I have problem I found this and just do this it works... 🙄 Granted some issues all you need is an idea of where a broken wire is or damaged/faulty device is located. This video gives an explanation as to what the problem is including customer concerns, technical diagnosis and viable steps to determine if it is the fault or if there is another issue.

[@amanaseboy]

I skipped many times but your energy and the effort u put in the video made it great. Good job bro.

[@Squidbillies1000]

Your "block of instructions" are stellar!

[@carlosresto4412]

Is nice to see a video in such depth, and you surely make it understandable! Thank You.

[@yuverhidalgo9338]

Soy cubano no se el inglés pero te puedo decir q el mejor q he visto de este carro, aprende y enseña más, aquí voy a estar pendiente a esos videos muy buenos, tengo ese problema, salud y suerte

[@mikechiodetti4482]

You are a Diagnostic Master! There's got to be something in that Dual Battery Module that is not functioning as designed. THAT would be great to diagnose and repair for the future, unless GM wants it as a core charge.

[@spicythai2000]

Thank you for going through all the troubleshooting. I'm a mechanic too and made quite a few videos to help people out. Keep up the good work. Thanks again.

[@loringbush3319]

I just bought a 2011 Chevy Malibu and my check engine is on. Im gonna have to get this checked. It runs great! And yes I have a six mounth warrenty!

[@jamiuajasa2006]

I really appreciate your effort to upload videos like this to this channel. You really did a good job guy! Waiting for the part 2 to learn how to test the Battery Module incase or futures purpose.

[@gelli8999]

0

[@thestick219]

You should do a case study on the start/stop failure with no check engine codes that seems to be plaguing a lot of gen8’s, including my ‘14 LS.

[@kelvinwoodsworship]

Great video and great work. I also make my own flow charts but I do absorb information from other techs as we all should from each other when brainstorming. I was very shocked that replacing that unit resolved the issue. It may not be the case always for everyone. I hope others watching don't jump to the conclusion but at least check as you did. Thank you so much for this video!!!

[@movingforward4950]

I'm proud of you brother even though this video is a year old multitasking entrepreneur go-getter that's what you are brother

[@carmendaugherty2486]

Thank you for this video. In my case the trunk negative cable was lose. I had the car in for service then suddenly the check engine light was on throwing this code. The dealership told they would need to schedule a visit to diagnose the problem. And average cost for this problem was around $200. I fixed this in three minutes took longer to watch the video. Thank you so much

[@msvaughn4961]

Hello, I am having this same issue and I wanted to know what did you do to resolve the issue? Thank You

[@juanrobledo9807]

Excellent tutorial. Good job 👏

[@porfiriolopez8937]

Best teacher ever good job men...

[@debrajohnson4871]

Good job tks again for taking the time to show us

[@edwardthayer9386]

Such a great attitude! Thank you!👑

[@thisworldfakeashell4098]

Very nice video bro you deserve a trophy!🍾🏆

[@marinaschmitz4942]

Hey! So how did you replace the DBCM? I looked everywhere and could not find any information about that. I was trying to replace one and it started sparking. Do you remove the battery first? If yes, did you use a memory saver? Thank you so much!

[@alrifainidal]

great video thank you for a good work

[@nicknicu1787]

I’d like to have a chat with the GM engineer who’s decided to place the CEL right where the tachometer needle stays at idle out of all places. Great video,lots of good info! 👍

[@johnturner8829]

They put it there in hopes one doesn't notice and keeps driving to make things worse and spend more money on parts. Obviously I'm being a smartass but.....

[@anonymousinc6330]

Yeah, have a chat with them about how drugs are bad, mm'kay?

[@raulwalker8128]

Amazing work and thank you for your time

[@taraconrad9337]

I just replaced asm fuse box and the light did go off. However, my remote start still won't work. Did I do something wrong? Should I have disconnected the aux battery prior to replacing the fuse box.

[@seftonplayer32]

Just to clarify, I think the Auto-start was the re-start after the engine shuts down at the lights, not the remote start. Similar to the Skyactive/Bluemotion of the Mazda and Volkswagen etc.

[@TheDogLife5225]

2nd time with same code after dealer repaired first time. Under driver's carpet, there is a ground post where 2 wires junction. With firewall leak onto carpet, this junction is corroded. Just replaced connector to one of the lines and my battery voltage just returned to over 14v. Does this junction go to the module?

[@HudsonvilleGarage]

What is the name of that second load tester? The one with the heating element?

[@rondail5675]

Thanks for sharing a hard one!!

[@ADVANCEDLEVELAUTO]

Thanks for watching!

[@benjaminlevi7792]

Thanks for your useful video

[@ADVANCEDLEVELAUTO]

Thanks for watching

[@rafaeltorovip]

great teaching experience. Thanks

[@ADVANCEDLEVELAUTO]

Thank you

[@anonymousinc6330]

Yes, a great teaching experience on why not to buy GM built after 2000.

[@RyanWehr]

I am dealing with this Code. my altinater was only cranking out 12.5 volts. I had it rebuilt. Also after id release the break peddle and the center council would turn off and turn back on and fire the check engine code.. I also found a ground wire, that was exposed and had corrosion on it.. So I was only getting the CE light after the Eco boost would kick in. After fixing the altinater and the wire, the CE light went off on its own, but came on again on its own with no Eco boost.same code. Does the car need to go through a few cycles?

[@CReaper210]

So at 20:58 when you were taking those parts out, is it possible you could explain how you detached the thing to the left of the battery tray and how you got the tray itself out? It was fast-forwarded and I couldn't tell what you were doing even with the vid slowed down. I can't find anything online showing how to take that thing out and I've disconnected everything I see and it's still stuck in there. This video is the only one I can find where it's removed.

[@cabbie737]

Good job mate 👌😁

[@MrBrownCanadian]

Have the same symptoms in the a Malibu in my shop today. Load tested all power feeds and voltage dropped all ground and powers came to same conclusion of battery module but told service manager was unsure if this will fix as there is a lack of info on the module. This video supported my findings a little bit. Great work.

[@justsumguy2u]

Good ol' GM, failed modules after only 5 years

[@feeneysmechanical6215]

I had to replace a chassis module on a 2017 Freightliner tractor. Two years old and only 35,000 miles on the odometer. I couldn't believe it.

[@justsumguy2u]

@Truth Defender You obviously don't know much about things automotive. A Toyota or Honda can go 20 years and 300K without ever needing modules replaced

[@finncampeau4922]

@@justsumguy2u you are correct!

[@andybub45]

I have a 99 Tahoe, all modules and computers have never failed.

[@larryholcombe4817]

You explained it very well ! Great job !!👍🏼 ….. but i have a question when you was testing the auxiliary battery shouldn’t you have unhooked one of the batteries cable to get a accurate reading ? Like you would testing batteries in a Diesel truck ?

[@JeffBrown1966]

should you have disconnected the main battery before testing the trunk battery?

[@mikesmith3316]

Thanks for great video. Did this part have to be programmed? Thank you!

[@nayeliramos1355]

Hello! Nice video btw I have the same code right now but my question is what if after both batteries being checked they came out as good , what could the problem be then?? Thanks I hope to get an answer

[@rrmech11]

Nice job

[@robertg.1765]

Is that a 4 awg positive wire that connects rear battery to the front?

[@justinhayward5027]

Nice video man. U wanna separate those batteries main and aux battery when testing those u can get false readings cause those batteries are connected. Keep up the vids man!!

[@larryholcombe4817]

I just posted a comment about disconnecting one of the battery cables while testing the batteries lol 👍🏼

[@ericabertagnoli5469]

Good for you!dealership would have just said they can’t recreate the problem and tell you to trade it

[@bilalpakstni9704]

Good job 👍 bro

[@aceautonewportky]

This is just how manufacturers are making our jobs harder, I bet that alot of these down the road have this issue. Ones without the stop start feature probably won't have this issue.

[@anonymousinc6330]

Stop start feature is one of the MANY reasons I got rid of my 2016. Absolutely refuse to buy GM manufactured after 2005 again.

[@downeastoutdoors8713]

Awesome video, new subscriber here. I was curious on how you get service information i see it says on demand, would that be mitchell? Just trying to figure out how to get the service/repair info. Thanks for the great content!

[@jonathanrios9267]

It’s a program called alldata you can get a subscription I believe for a single vehicle or if u have a shop they got different options

[@tamiaadams8049]

I have had the engine light cut on temporarily but it does not stay on long. I’ve had issues with the car cutting off for a second at red lights, then it cuts back on right away. Then in other instances, once the engine cuts off, it will shut my car completely off and sometimes won’t even allow me to start it until time passes. I have a 2018 malibu LT. Other times, I go outside to start my car and it won’t start at all but the car will turn on, my engine just won’t start. So idk

[@jaimeleyva2661]

Will that module drain the auxiliary battery if it's not working right?

[@foolietv1994]

One thing they don't tell you is make sure you have the right primary battery. If u have auto start stop feature yours primary battery should be 1000 cca and not 650cca

[@YPCRaul]

is that for the 2013 chevy malibu eco 2.4L ?

[@hypersomrizz]

Thank you!!!

[@LH81633]

I’d like to see you do a video on throttle body? What causes it to fail! Is it carbon build up that promos computer to constantly adjust and burn up or is it just faulty.

[@lugasatadmin]

Hello, please write me where I can find this schemes? Like in this video. Thank you

[@aliciaeramo]

Does the control module have to be synced to the car according to the VIN number because that's what it says are you can just order the part cuz I'm having the same problem my car is dead in the water it cranked it died on me at a red light and then start back up that cranks for a whole week and now it's dead in the driveway the key won't even work to lock and unlock the car and I'm going to order me a new key

[@yuverhidalgo9338]

Sigo viendo tus videos ojalá sigas así y ya te sigo traduzco tus palabras pero eres bueno en lo tuyo y quiero eso nadie más q tu sabe hablar de este carro y no puede ser ya vi 3 mecánicos y aquí en west Palm beach Florida fueras millonario

[@deandoss2105]

So what battery cranks and starts the car on an initial first start up the auxiliary if I’m understanding correctly? But I don’t think I am…

[@aarondavis154]

I can’t seem to find out where to order one from and I am in Orlando Florida. Any suggestions?

[@jamesdanner7850]

Yo. Would you mind if I reference you in a coming up video that's either mine or my brother's? Most likely his. I haven't posted in probably 6 years. Anyway, I have 2 of these cars with this issue and the first one im tacking has 2 new batteries . Probably needs that dual battery fuse box. I wanna run ur tests from the 2nd video and see what we see. Plus a couple more. Just like you , I'm a shop owner and would love to be able to share what I see but never any time. Respect u just for that. Honestly, I saw the bulletin and side stepped this car for 2 weeks now. Late at night with a beer, u did alot of work for me. Probably saved me that 1.5 hours or more of endless flow charts and diagrams just to figure out the system and test the way I and you wanna test. Either way great job and thanks

[@billrimmer5596]

Shouldn’t u have isolated the aux battery when testing?

[@zzzzzzz1178]

🇮🇶Thank you very much professor of sincere greeting to you

[@ADVANCEDLEVELAUTO]

Thank you for watching

[@robramsay3878]

I thought the aux. battery ground strap was loose or metal base deflected when you were tugging it at about 10.05. Hard to tell on small tablet . Thanks for making good content and sharing

[@ADVANCEDLEVELAUTO]

The body just deflected when I pulled on it. The ground was secure. Thanks for watching!

[@bigchief1658]

Where can you get this part

[@iwaazi624]

so i have a 2013 with the auto stop feature that was supposdly removed? is it possible the auxiliary battery is still in the trunk and never replaced hence forth why the car randomly dies after 40 50 minutes of driving?

[@iplayeasy2933]

I checked both batteries and they both checked out good under a full load meter. I thought I might try to replace the module, but then when I went to leave at night, the main battery was too low to start the car. I jumped started the car, and then drove it for a bit, and then shut it off and the battery was dead again. I replaced both batteries, the main and the aux battery, and erased the check engine light, and then drove it through six western States, and it ran perfectly including the auto shut-off when stopped in gear. The main battery checked bad at Walmart, and it was only two years old of a five year battery warranty so they gave me a new one. Just to be safe, I replaced the aux battery as well, and now everything runs fine and in more than a week, the check engine light remains off where it would come on in less than ten miles before. Just thought this might help before replacing the $200 plus module. I checked all the wires as well, and found no bad ones where suggested. It was the batteries.

[@stefanyromo9110]

Does the accessory system control turn signals through one of the IPFuses?

[@westganighttrain5166]

Did you figure it out?

[@fredrickblank216]

I usually never comment but it is sad this vid has 70k views. Starting my P305F error journey. Wish me luck.

[@automotivediagramsreading9711]

Thanks for the video..can you tell me what can i find the second battery tester that you used...thankss erick..

[@OscarHTX]

I'm getting a P058D code on my 2014 Malibu and just ordered a new DBCM. Hoping it fixes the issue. I took it into a mechanic and he put a new battery in and charged me $500 and obviously didn't fix the issue. Going to try and install the new part myself once it comes in. Thanks for the video, nice to see a Houstonion on here.

[@TheLocaChica05]

I have the same code on my 2015 Malibu. Did changing the DBCM work for you?

[@OscarHTX]

@TheLocaChica05 it did, no issues since. Easy install.

[@TheLocaChica05]

@@OscarHTX thanks sooo much!

[@evebydesigns]

Thank you

[@kdmq]

Isn't your aux. battery test invalid because you haven't isolated it from the main battery?

[@kaisavage3008]

Where did you get the battery control module part ?

[@brevooo]

My car is doing the same thing ny auto start isn’t working and my radio turns off whje the auto stop is activated then when the engine come back on my radio turn off so that means i need another auxiliary battery ?

[@fredsalter1915]

Your were juggling two terms: DBCM and DBIM (dual battery control module & dual battery isolation module).

[@user-wj8pq7vm4v]

My2019 malibu turns of at reds lights and won't restart for a while. Could this be the the problem? Any advise would help.i have been putting the car in neutral when i stop so the engine doe not turn off but i still don't now if this is going to be a temporary solution.

[@TheChadls]

Do you have a part number for the dual battery control module

[@dashtyATG]

Hy thanks alot for your Great leson I'm getting this cod's and I need help please help dc/dc converter output voltage 1 performance P3055 output & p3056 input

[@alexsolis5685]

Has anyone had an issue with a rough idle along with this issue? My 2014 malibu has these same issues but also has a rough idle on any gear other than park. Also the thermostat moves to Hot while driving at low speed, 1-2k RPM. PLEASE HELP

[@HypeTv100]

hey sir does this have to be program to the car ?

[@deionhughes6867]

I can see already that the main battery underneath the hood was replaced with the wrong battery size and type. That battery is supposed to be a 49 "AGM" battery. You can see the hold down block on the side is not even touching the battery. Battery in that vehicle is H5/47 flooded lead acid battery, which is way too small and wrong type. Looks like it was installed at walmart from the label which explains a lot.

[@davidjoegamez5901]

How I test modules. 🔨🔨 sometimes it works again, sometimes it stops working. 🤷🏻‍♂️ 🧏🏻‍♂️

[@lawrencekarr6954]

I have to jump my car every time to start. I replaced the main battery and the battery module and still no change. I checked all fuses and loose connections. My meter on my dash shows between 14 to 13.8. when I turn the car off the meter on my dash shows between 11.7 to 12. Which causes me to jump it. I've tested the alternator and it's good... I'm at my whits end. I need help!!!

[@gameplayer222]

I have a 2013 eco with the BIG battery in the trunk in passenger side.

[@JemosharkJemo]

Nice jop man

[@john1240able]

How many miles on the Malibu

[@victornilo765]

Hello, good afternoon, my vehicle has that problem. I would like to know HOW CAN I BUY THAT PART CAN YOU GET IT?

[@lizardbrains100]

Same here! Have you found it?

[@levicarter890]

Is this on all 2.5 Malibu LTs?

[@dashtyATG]

Sorry 1 more thing what website and diagram is it?

[@janjackson4802]

I had the very same thing happened and code. All fuses and wires connections were good. But I had low main battery charge so I replace both batteries and BOOM the engine light went off and problem solved. Simple as that.

[@johnmarks7243]

Those vehicles use a much larger group size AGM battery on start stop engines. That's what all that extra space is for. That smaller battery is for the non start stop2.0L

[@charliemagoo7943]

Type b fails twice before code sets and mil is requested. Type a is immediate. Type a are usually emissions high like misfires

[@buahahaxitsxME]

Hi. I have a 2016 Malibu LT. The auto stop basically shuts my car off BUT my issue is actually that if I do not drive my car within 6-8 hours (10 if i am lucky) my car will not start without a jump. It shows service stabilitract message and it used to say shift to park on occasion. I took it to the chevy dealer where they said my battery is good and they dont know what thw problem is other then replacing the parking sensor. I got that fixed but my car still doesn't start reliably. Would this be related to the module ypu talk about? Or any other suggestions? Like I said chevy didn't know the issue. -_- i have 43k miles. (Edit. Does not show check engine light and I also get a message about battery saver active when cranking the car. Push to start, no key)

[@maddenchamp33]

You ever figure it out?

[@buahahaxitsxME]

@@maddenchamp33 bad/dead battery! They don't last over a year parked in the desert sun apparently lol

[@buahahaxitsxME]

@@maddenchamp33 also the sexond place I sent it too said the chevy dealer read good bc I drove over there and they tested without letting it cool and sit a while. 🤷🏻‍♀️

[@maddenchamp33]

@@buahahaxitsxME which battery was bad the main battery or the auxiliary battery? “Small on in the trunk” and if it was the small one was that causing your main battery to drain?” I just bought a new main battery and it dies sitting over night.

[@buahahaxitsxME]

@@maddenchamp33 oh that sucks... no just the main ! Can you exchange it. So the first battery that replaced ours only worked like 2 months.... took it back to see what was wrong and they replaced it for free bc it had a faulty cell. Hope you just got a crap battery and it isn't something more major.

[@nosoymecanicoperoleintento4521]

My alternator is not putting charge to the battery I replace the battery and alternator and still nothing check the fuses everything seems to be good what else could it be

[@mike1411000]

Auto start is auto stop start. If any gm car has a check engine light the remote start function will not work.

[@orencomputerelectronics8751]

The relay in bat module fault , it dont connect to aux positive +

[@ADVANCEDLEVELAUTO]

Yes. Replacing the module fixed the problem. In part 2 we go over how the module works and how to test it.

[@samanthaclemens5693]

My car is literally at chevy right now for this exact issue. Come to find out its covered under the emission warranty for 15 years or 150000 miles. More people need to know. It seems like the most common issue for 2014-2017 model Malibu

[@alexsolis5685]

Where you having any issues with a rough idle along with the auto stop problems?

[@samanthaclemens5693]

@@alexsolis5685 you know not necessarily a rough idle, but when I was dring it it would kinda kick back a little if that is the right word like aging 55 and all of a sudden you would feel like a hesitation. The car never died but so far since I got it back from Chevy yesterday the issue "seems" to be gone

[@mwartist]

@@samanthaclemens5693 Is there any more info you could offer about this? Bought new and dealing with this issue currently, at 70k on my '15 ls. Like what exactly they did, and just covered under "emission warranty"?

[@samanthaclemens5693]

@@mwartist it's in your warranty booklet

[@samanthaclemens5693]

@@mwartist I bought brand new too. This was the last warranty I had. It covers the whole auto stop system. And my rental car. The battery had went bad, the one on the trunk. It's around $200 for the battery. So my check engine light was on. When the pulled the code and it came with that issue I wasn't responsible for any of it. But if it didn't pull that code then I would have had to pay for that diagnostic also