Jump to content

Dead battery and check engine light

2020gmc
 Share

Recommended Posts

Shiva Enthusiast

Shiva

Posted
Posted
On 9/1/2020 at 12:38 PM, JohnTz said:

Just checked mine. About 1 turn each bolt to tighten. Never had any problems but wanted to be proactive on this. Thanks for the heads up. 

Going to check mine in the morning!  Did you have to disconnect the neg battery terminal or can you just tighten it with a ratchet?

  • Replies 83
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

Tomato
Tomato

Thanks for the fix!  Tripped both P0700 and U0100 today and found this.  Those 4 bolts were only at about 15 inch-pounds, and the green indicators were up.  Talked to my service rep at the dealer to c

2020gmc
2020gmc

Lol! Thanks. Must admit this is my first gm product and it takes the prize for spending some time in service so soon. Got my truck back! They put a new battery and cleared codes. Plus they took care o

Colossus
Colossus

Well she'll not be too troublesome from here on out.  Chances are, she sat for quite a bit after being built and the battery went bad. 

Posted Images

JohnTz Enthusiast

JohnTz

Posted
Posted
4 hours ago, Shiva said:

Going to check mine in the morning!  Did you have to disconnect the neg battery terminal or can you just tighten it with a ratchet?

I just tightened them. 

  • 3 weeks later...
John Bro Enthusiast

John Bro

Posted
Posted

Wow, guys - thanks for posting all of this. The battery in my 2020 Sierra is dead with no explanation but with lots of warning lights and guess what -  because of YOU, I was able to find this and relay the information to the dealer.

 

Why does it have to be me to come to the rescue? Granted, it is not yet fixed - but it sounds exactly like the issue at hand.

 

Yes, this needs to be recall.

USAFRET Enthusiast

USAFRET

Posted
Posted

Mine went back to the dealer Monday on a rollback for the second time with this issue. I also informed them of this problem but still have not got my truck back. I also told them I wanted a new battery since this was the second time and this time the battery was drained down to 2 volts.

John Bro Enthusiast

John Bro

Posted
Posted
21 hours ago, John Bro said:

Wow, guys - thanks for posting all of this. The battery in my 2020 Sierra is dead with no explanation but with lots of warning lights and guess what -  because of YOU, I was able to find this and relay the information to the dealer.

 

Why does it have to be me to come to the rescue? Granted, it is not yet fixed - but it sounds exactly like the issue at hand.

 

Yes, this needs to be recall.

Okay, I just got my vehicle back BUT - the UBEC bolts were already at 53lb. They could not find what drained the battery. And, given what I am reading here, it is just a matter of time before it happens again. This sucks so hard - got a new vehicle because I have no time for such problems right now at all. Like several of you.

 

But will report back with anything further. I plan to drive by there in a couple weeks and have them check the battery.

RossEGCA Enthusiast

RossEGCA

Posted
Posted (edited)

I have a 2020 AT4HD and its now in the shop for the 7th time since March.  This the 4th time the battery has died.  Actually already had an appointment for squealing brakes for the 3rd time (separate post).  I just called them about tightening the fuse box bolts and gave them the service bulletin number.  I had to give them the service bulletin number about the brakes too.  Why are we having to tell GMC mechanics how to do their job.  This is ridiculous.  I expect they will tell me...again....that the battery is fine and there is nothing they found to cause it.  I hope its the bolts....still hoping to get rid of the brake squeal too.  

 

UPDATE:  I picked up my truck yesterday and as I suspected the mechanic said he could not reproduce the squeal on the brakes.  I had showed a video of it to the service tech.  They also said battery tested fine and they could not find the problem.  I showed them the service bulletin reference posted above, but they couldn't find it in their system.  I got home and checked the bolts on the fuse box and mine were one full turn lose as well.  I hope that resolves the issue with the battery.  

Edited by RossEGCA
Colossus Senior Enthusiast

Colossus

Posted
Posted

because issues that are not very common are not going to be known by all the service departments and there are so many service bulletins out there for all the vehicles that no one memorizes them.  This forum allows for the very few people experiencing the issues you are to come together and ****** and complain and look for help, thus the bulletins come up in conversation and we get to inform the dealer service departments.   The REAL good mechanics will look for TSBs while the others will just shrug their shoulders and say "can't duplicate issue."  or "Issue is normal" 

  • Haha 1
forest Enthusiast

forest

Posted
Posted

just tightened my bolts after having electrical issues ... they were all 1/2 turn shy of TSB recommended torque and green indicators were popped ... guessing this was engineering torque miscalculation ... wonder what manufacturer torque specs were ... will see if this addresses issue

Joemahma New Member

Joemahma

Posted
Posted (edited)


Hello, all. I found this forum looking for the same issue that happened to me today. i have a 2020 sierra denali with the 6.2. I was slowing at a light and as soon as I came to a full stop the truck jerked and everything went blank. no power to anything. no hazards nothing. it was rush hour and everyone was blasting their horn blah blah blah.. anyway. (oh no onstar since no power) I got the dealer on the line and they came and dropped off a loaner and had the truck towed to their shop but it was late so they will look at it in the AM. I suspect the battery issue too or the ground terminal mentioned in another post but I have only had it 3 days. 200 miles and only 50 of them are mine.. anyway, the tow driver tried to jump it so he could get it out of gear and nothing at first then he used a different jump pack and the lights kicked on but still not enough power to start it, at least he got it out of gear so he could put it on the truck... 

 

Its a lease, I traded my 2017 sierra denali lease in for this. the 2017 never had one issue. I hope I dont have trouble with this thing, I am scared to drive it any distance out of fear it will do it when Im far from home or on the highway.. I had no lights or power brakes, steering no brake lights, no hazards it was completely dead, if that happend at night on a busy road It could have caused an accident.. scary stuff. 

Edited by Joemahma
Shiva Enthusiast

Shiva

Posted
Posted
10 hours ago, Joemahma said:


Hello, all. I found this forum looking for the same issue that happened to me today. i have a 2020 sierra denali with the 6.2. I was slowing at a light and as soon as I came to a full stop the truck jerked and everything went blank. no power to anything. no hazards nothing. it was rush hour and everyone was blasting their horn blah blah blah.. anyway. (oh no onstar since no power) I got the dealer on the line and they came and dropped off a loaner and had the truck towed to their shop but it was late so they will look at it in the AM. I suspect the battery issue too or the ground terminal mentioned in another post but I have only had it 3 days. 200 miles and only 50 of them are mine.. anyway, the tow driver tried to jump it so he could get it out of gear and nothing at first then he used a different jump pack and the lights kicked on but still not enough power to start it, at least he got it out of gear so he could put it on the truck... 

 

Its a lease, I traded my 2017 sierra denali lease in for this. the 2017 never had one issue. I hope I dont have trouble with this thing, I am scared to drive it any distance out of fear it will do it when Im far from home or on the highway.. I had no lights or power brakes, steering no brake lights, no hazards it was completely dead, if that happend at night on a busy road It could have caused an accident.. scary stuff. 

It's extremely alarming that GM has not had a fix for this issue.  These trucks have been having this issue since they the first one was sold.  I don't have anymore fate in mine.  Every time I drive I keep waiting for something to go wrong to the point where I don't enjoy driving it.

 

I had a 2018 F-150 Platinum Ecoboost with no issues.  Just liked the Denali styling better.  Will drive this until the warranty period is up and probably go back to Ford or see what the new Tundra looks like.

Pinnacle Enthusiast

Pinnacle

Posted
Posted
13 hours ago, Shiva said:

It's extremely alarming that GM has not had a fix for this issue.  These trucks have been having this issue since they the first one was sold.  I don't have anymore fate in mine.  Every time I drive I keep waiting for something to go wrong to the point where I don't enjoy driving it.

 

I had a 2018 F-150 Platinum Ecoboost with no issues.  Just liked the Denali styling better.  Will drive this until the warranty period is up and probably go back to Ford or see what the new Tundra looks like.

Ya I bought a brand new tundra even though its flawless Id love to get this new one. 

KevinSr1 New Member

KevinSr1

Posted
Posted

Found this thread after 2020 Silverado 5.3L Trail Boss 7500 miles was totally dead.  Built 01/2020. Took forever to jump it. All the codes tripped. Theft, anti lock brakes, traction control, etc... Drove it home and the engine light stayed on. Started next morning and afternoon with no problem but the check engine light was still on. Parked in my driveway and popped the cover to the fuse box under the hood and found the 4 bolts mentioned in this thread were approximately 3/4 of a turn loose. Tightened them up. The very first start up, the next afternoon, no problem and the check engine light was out! Still took it to the stealer that day and they couldn't duplicate the problem. Cleared the codes, checked battery and connections. All was good. Didn't mention the fuse box bolts just in case they'd void my warranty. Stealer didn't mention they checked the fuse box bolts so they must not be aware of the problem. Thanks to all of you who post and help! Others like me truly appreciate the time you spend sharing your knowledge. Kevin. 

  • 1 month later...
Chevy owner New Member

Chevy owner

Posted
Posted

2020 Trailboss, 6.2L with 7200 miles, owned it 4 months and battery was completely dead overnight. Was able to jumpstart and drive to dealer where they replaced it with a new AC Delco battery. Hopefully, that won't happen again for at least several years....

Fsu96 Enthusiast

Fsu96

Posted
Posted

2020 Sierra AT4 5000 miles. Today was the second time my truck was completely dead. First time was over night,  battery wasn’t able to be jumped or changed had to get towed to the dealership. They replaced battery and said it was a bad cell. This time the truck was sitting for 3 days, once again completely dead and can’t jump or charge battery enough to even shift from P to N.  Looks like it’s getting towed again tomorrow morning. 

steve841 Enthusiast

steve841

Posted
Posted

F me... just joined this club.

 

2020 3.0 totally dead.  3 hours on a charger, not even a light.  Tow guy had the industrial jumper.  Got it in N and hauled it off.

 

can’t wait to hear the BS from service advisor..

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • jgaudet99
      Tire psi

      By jgaudet99 · Posted

      Yes that's right, it's the upgrade that includes the overload spring and all that stuff.   Someday when I'm empty and going by a scale I'm going to stop in and get some weight readings.   Exactly  you should have the ability to change individual settings, in in Canada so I'm driving with kph but then I'm stuck with kpa when I want psi lol    
    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      You must have that upgraded gvw package which is only available or at least was in 2025 with the diesel engine for the 3/4 ton and that gave the truck physically the larger 12.0 ring gear rear diff and the 3500 rear spring pack. There is a difference in what the diff housing looks like externally as one tell tale and also your truck should have the upper overload spring pack and the frame pads that the pack goes up against.    The pressure the tpms system kicks the alarm in on a stock setting truck, that is a good question and was just from what I recall but I doubt I made any notes on it as I knew for the rear that it was not at all what I was after regardless either. Being that you have a diesel and if running on stock tires the minimum pressure on an empty truck seems to be around 50 psi from hearing of those that have weighted the front axle but the rear axle is very similar in weight to a gas truck and again a near empty truck on the rear could go down to 35 pounds at minimum. However the weigh scale is the proper way to know for sure as a guide.    As to changing the readings on the dash from metric to the US measuring system, oh yes that is done easily but what I was attempting to explain was that I can't pick and choose items I want to have in US and those I still want in the metric system at the same time as its either all or none. For example lets say you drove into Canada and switched your dash over to metric so your speedometer read in km an hour, well then your reading kilopascals on your tpms readout and your wife looks over and says what the hell is that saying in the tpms screen and you say "darned if I know, I think its Chinese" !
    • Chuck FB
      Some Assembly is Required

      By Chuck FB · Posted

      This is partly why I decided to have switched over to Amsoil SS as a way of hopefully preventing the buildup of the sludge/carbon on the pistons and clogging of the oil control rings and the carbon that would cause the compression rings to stick in their grooves as well as stay cleaner up top of the heads in the valve train in the first place, an oil that has tested better by third party testing over typical shelf oil and also doing my best to run relatively short OCI. However in saying that I don't think there is any way to easily prove the oil I was using prior allowed for a buildup at the OCI I was doing, nor in the other direction to make claims the Amsoil is keeping everything clean either. There really isn't a window into the engine is there to know anything for certain even if oil samples were taken for example that showed still healthy oil being dropped out of the oil pan other than engine tear downs that extensive and expensive testing of oils does to actually visually see what is really going on inside the engine. I wish there was some easy method of seeing what is going on but I don't happen to be aware of that if there is.  
    • jgaudet99
      Tire psi

      By jgaudet99 · Posted

      My truck is a ¾ ton but my placard also says 80 for the rear tires, I think I might have the upgraded suspension to the 3500 series maybe.   I put my air down to 60 and the light was still on, and there was no way I was putting over 60 psi in the rear empty and not towing because I knew the actual number Toyo gave me and I didn't wanna ruin the center of my tires!   And you actually can change it in the settings from metric or is and it will show kph or mph then when you go into your tire settings it will be either psi or kpa, but it would be nice to just change it directly on the tire psi page 
    • Grumpy Bear
      Some Assembly is Required

      By Grumpy Bear · Posted

      Common Sense Assembly   Your driveline is forgiving of the occasional mistake. It will even often forgive the random serious blunder. But it will not forgive a continuous bad habit.      What? Not everything needs to be a five thousand word essay.       

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...