Dead battery...2020 L5P

[Colossus]

I have been told and do believe that there are multiple modules/things that still run even when the truck is off.  What they are exactly, I do not know.  I see posts on various forums (not just GM, but other manufacturers) about similar issues with batteries going dead after sitting for as little as 3-4 days, but what concerns me is the fact that the HDs have 2 batteries.  I haven't had any issues thus far on my 2018 Duramax.  But if I did and the service department could not figure it out, I'd probably start pulling a few fuses at a time, to see if I can narrow down where the drain is coming from and go from there.  In the mean time, carry a good jumper pack (I'm getting me one) and keep it maintained as it will likely come in handy.  In fact even with the battery drain issues we are seeing on the light duty trucks and in some cases, cars- I'm recommending to everyone that they carry around a good battery/jumper pack.  Cars don't need as big of one as we do for our heavy duty trucks which need some serious amps to get them going when cold.. those little cell phone sized boxes won't start a HD. 

https://www.trucker.com/technology/article/21747639/new-compact-booster-pack-can-jumpstart-16l-diesel

[DuramaxJ]

So I to have been having the dead battery issue.  Dealer changed the DVD players in the headrest as they said that was the parasitic draw that was killing the batteries.  Drove the truck for a day and everything was functioning normal.  Didn't last even 24 hours sitting and I try to start the truck with the fob and nothing.  I go outside and its completely dead.  Had to use the key to open the door.  Fob wouldn't work.  I guess that wasn't the only draw.  Back to the dealer it goes.  

[Likarok]

By about 2030 if you say this in a GM truck you better be close to a charging station!

[Beast ZL1]

I had both batteries replaced in my 2020 2500 HD Diesel under warranty. The truck was totally dead after sitting for two weeks.

My trailer lights flash every 30ish seconds when parked at night with a trailer. I thought it was a “safety feature.”


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[JamesR125]

I had the cameras stop working on my 2021 3500, took it in the first time and they disconnected the control module and reset everything. The second time they told me a battery had gone dead so they replaced it with a larger capacity battery. I drive every day and I have 2 batteries and dual alternators, so I suspect there is something going on with the batteries, not a draw. The dealership had to call the GM TAC line to get advice as they hadn't seen this issue before

[Felipe borunda]

I have a 2020 gmc sierra denali 2500hd duramax I live in colorado and my truck currently has 16k miles and I got my truck in August of 2019 well one day I went to start my truck and I heard a click while starting indications of low battery so I took the battery's to test and tested good just low so I had them charged truck started fine drove it 2 months battery still were acting low here and there so I just figured the cold and low usage is draining my battery's took a trip to California made it just fine 3rd day after being in California wanted to go LA one hour oway from where we were and stopped to fuel up and the truck would not start showed the low battery indications and truck would not start screens would turn off but would restart once intented to restart ignition.. whent to the autopart store bought 2 battery's and the truck started drove it back it back 5 minutes oway and left it parked next morning started drove to Vegas stayed the night truck would not start after shutting the ignition have it at gmc dealership hope gmc dealership can figure it out 

[lee bradford]

i believe i just joined all of you guys driving chevy silverado.i have 3500 hd duramax high country and this morning wanted to go somewhere but my truck was dead.called dealer and they say i should have truck towed to them at my expence.$80,000 truck with a new car warrenty and i have to get it towed to them whats wrong with that picture.at this point im so mad i have to hang up.so i get wifes car and jump itand i get it started.now it has been running for 20 minutes and it starts again with no problem.only thing in pass few days is ive been getting messages about trailering but i have not been towing anything its like im towing something every time i start my truck i get messages like i have a trailer in tow.hope it makes it till wed. thats when ill be taking it back to chevy dealer.

[papadop]

Hey all, was doing a Google search that brought me here. I have a 2020 Silverado 1500 high country. I went to go start it and was completely dead. Now before this happened I noticed that the parking sensors switch was disabled. Every time I tried to enable it would enable and quickly disable. Also noticed when I start the truck with the remote start, the headunit would be black when I get inside the vehicle and hit push to start. So I would literally have to turn the truck off then on for it to come back up. Just about 2 days later the vehicle was dead. I jumped everything was back to normal. I called the dealership to notify them that this was happening and had them check it out. Dealership said no issues with the battery and etc. It was about a week, all over again except the parking sensors were working fine. So I said maybe I left something on which is impossible but let the second time go but closely monitored to see if anything was out of the norm. Finally, about a week or two go by, and the headunit issue starts again. Black screen after I go into the vehicle after it was remote started and hit the push to start button to leave. I knew it right away that it was going to once again drain the battery. New thing I noticed was that the wifi hotspot, after the truck was off for HOURS was still on. I noticed this because my phone was connected to it. This was at least 16 hours where the truck was not touched. I planned on the next day for it to be dead, and there it was completely drained. I made another appointment and I will update you guys on what I find. What I would recommend is see if your vehicle has a hotspot and if it does see if it stays on for hours after your vehicle has been turned off. I use my hotspot but there is a way to turn it off. Whether that works or not I'm not sure. I will further troubleshoot though because the dealership is probably going to give me the run around again. Good luck 

[x31]

I had the same sequence of events just happen to me on my 2020 Sierra 1500 5.3 as papadop has had.  I wound up here on an internet search and I am glad I did because it helped me remember how this all went down.  This morning I went to start the truck and it was dead in my garage. I remember now I did something different yesterday, I had used the remote start for the first time in a long time because the truck was going to be really hot inside and wanted to precool.  Once I got in and turned it on I immediately noticed that the head unit was black, I tried to turn it on with the power button but noting happened.  I had to shut the vehicle and restart it to get the head unit to work.  I got home and parked it as usual then I went to go for a drive this morning and it had a dead battery.  This issue has happened to me one other time as I recall and I assumed I left something on.  I am charging it now and will call the dealer tomorrow because it is Sunday now and see what they have to say, I'll be back to let you know.  I am going on vacation next week and I will not be using the keyless start no matter what.  The new saying is If the screen is black your gonna make tracks lol

[x31]

When the dealer took it in they found it had a scavenger power drain on the battery but the problem is that  it is an intermittent problem.  In the off position It was drawing 3.5 amps when they took it in but now that condition has gone away so I am left with an unknown.  Not a comforting feeling wondering if your truck is going to start tomorrow.  Not sure what to think at this point, they said I can pick it up because there is noting they can do at this point and asked for my help in monitoring any unusual activity in the vehicle.  The adviser did add that a discharged or low battery will make the computer and its systems do allsorts of strange things so in my case we need for the problem to show itself long enough for them to locate it.

 

[doverarjim]

Welcome to my world!!!!  I've got a 2019 3500 SLT, truck has been perfect except for not knowing if it will start.  GM has replaced 3 thats Three sets of batteries in it.  Last set took 6 days until it had to be jumped.  This has been going on for me about 2 years now.  Dealer can't spend the time to find the problem, because it does not happen all the time, truck has spent 10 days or more at dealer over this.  Got some information about setting it into shipping mode was told that only imporant running stuff will be powered up, would not start next morning!!!  Dealer said EMF's could be problem so parked in the middle of 40 acres with nothing with in 400 feet of truck still would not start.  I have a 2022 on order now!!!!

 

[swathdiver]

You fellas ought to get the dealer level scan tools and frequently do parasitic draw tests to find the problems.  Or pick another dealer who will endeavor to find the problem.