2014 GMC Sierra 1500 AT Starting Problems

[Bigpapa]

Reaching out to see if anyone else has experienced this. I have a 2014 GMC Sierra 1500 All Terrain with the 5.3. I’m having problems with starting this thing from time to time. It will run fine for a few days and fire right up every time I get in it. However some days on a cold start or after driving awhile and stopping, when I get in to start it up I got all dash lights are working, except I notice my MPG history is erased (which tells me we’re in trouble) then I get messages on the dash that reads, service trailer brake system, service stabilitrac, power steering reduced. Then the check engine light will appear. When I try to crank everything goes black and I’m not hearing clicks from the engine. After I let it set for about 5 minutes it will fire right up no hesitation. I run the codes on it and there’s is a laundry list of codes, which the GMC dealership is saying they’re all low voltage codes...so we swap the battery truck, it  runs fine for about a week and a half and then starts doing the same thing. Alternator is ok because I can see it recharging the amps on the truck....any ideas as to why might cause all this? I’m desparate!!! 

Edited February 7, 2020 by Bigpapa
Update

[Lsgun1]

It sounds like a dead battery but kind of odd that it starts up after a few minutes longer.

[Bigpapa]

That’s the weird part it has a brand new battery in it. 

[Spendit]

My 2014 did the same thing, after putting in a new battery - I tracked it down to the negative cable on battery itself. There is a ton with the same issue - the factory crimps are weak, thus loss of power at times.

 

I ran a complete new cable - no issue inside a year now. Some run a 2nd wire to ground as a fix too.

[L86 All Terrain]

Yes Spendit is on it. Some had bad neg cables, mine had a loose terminal and a loose ground by the engine, but some cables themselves are junk. Tighten up that cable and ground, if no luck replace that cable.

 

Could be a BCM issue if none of that works.  

[tlaw91]

My 2014 did the same thing, after putting in a new battery - I tracked it down to the negative cable on battery itself. There is a ton with the same issue - the factory crimps are weak, thus loss of power at times.
 
I ran a complete new cable - no issue inside a year now. Some run a 2nd wire to ground as a fix too.

You got it! Truck needs battery cables all day

May as well be a maintenance item on these trucks


Sent from my iPhone using Tapatalk

[Gearhead1000]

I am having trouble starting my truck when it is warm. Just barly turns over. I will change the negitive cable and report back.