2020 2500 SLT DEAD

[DNHMIKE]

So Saturday I back the truck out of the garage,do a few errands and put it back in the garage. I go out Sunday and truck is totally dead, no lights, no horn, nothing.  I call GM road side, tow truck comes he hooks a jump box to it and it fires right off. After it starts there is NO code, NO warnings, the clock is the correct time, even all my radio channels are OK. So I drive it to my dealer, they take it in to check it out, after 45 minutes they come out and say they can't find anything and hand my a piece of paper, ( #13-08-166-001E Aftermarket ALDL or DLC interface devices causing multiple issues). Then they want to do a drain test on the battery, so I say OK, after another 2 hours they come back out and say everything is fine. They state that my problem is the AMP power steps that are plugged into the OBD port under the dash. I find that hard to believe, that after sitting over night the battery would go totally dead. The truck has less than 1500 miles on it and has sat for up to 4 days straight before all this and started with no problem. Any ideas?

Edited September 14, 2020 by DNHMIKE

[shadow gray 2020 hd]

Dunno, but if you have a meter you might try checking the voltage on your battery at night and then again in the morning.  If your truck has 2 batteries check both.  See if there is a difference and how significant.  Then do the same again with the steps dc/d for one night.  See what if any difference there is in a drain.  If there is a significant difference there may be something wrong with your steps interface that is draining the battery.

 

 

[cNate]

I had AMP steps on my last truck for 3.5 years with no issue with the battery.


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[shadow gray 2020 hd]

1 hour ago, cNate said:

I had AMP steps on my last truck for 3.5 years with no issue with the battery.


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Not saying I agree with the dealer, but at least if you check for yourself you can know if it is or isn't the issue.  Just saying what I would do if it were mine.  Of course your issue may be an intermittent glitch.  

[Njmurvin]

After reading this topic, I have started wondering what I will do if I find my truck dead in my garage. I park it pretty close to the end wall of my garage to get it to fit - so close that I don't think I can get the hood open if needed. If the batteries are completely dead (for any reason), can I get into the truck get it out of park and into neutral to push it back far enough to get the hood open?

Edited September 15, 2020 by Njmurvin

[Tomato]

Check the under hood fuse box TSB...

[Colossus]

All new vehicle owners especially truck owners would be wise to carry around one of these:

https://www.amazon.com/DEWALT-DXAEJ14-Jump-Starter-Compressor/dp/B06XD6XBCM/ref=zg_bs_318336011_14?_encoding=UTF8&psc=1&refRID=1YTXTFGNT9G775WVBS31

 

This big one for the diesels especially. 

 

Go visit other forums out there, You'll see many issues related to the damn battery/charging system and batteries going dead. 

[shadow gray 2020 hd]

 

53 minutes ago, Colossus said:

All new vehicle owners especially truck owners would be wise to carry around one of these:

AND KEEP them charged.  I have bought several over the years, one of the first gifts I gave my oldest daughter after she started driving.  Every once in a while sams club runs the stanley fat max 1000 amp starter for like $59.  Had to use it a couple times on my tractor in cold weather and it rolled it fine.    

[bowtie2007]

Well, add me to the club. My truck was completely dead after sitting for about 12 hours. I don't have a jump box big enough so i have to wait until monday. I'll call roadside and then get it to the dealer. I do not have amp steps or anything else that should be draining the battery. I'll update with results when i find out.

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[DNHMIKE]

Well after doing some research,  what I've come up with is that, the fuse box under the hood, is held together with 4 silver color bolts that are to be torque to 56 inch pounds. Mine were only maybe 10 inch pounds.  There is also a green color indicator by each bolt that tells if it is tight, it's green but there not tight! I hope this helps.

Edited September 28, 2020 by DNHMIKE
wrong measurement given

[bowtie2007]

I got my truck jump started and i drove it to the dealer yesterday around 11am. The diesel mechanic was out so they didn't touch it. I'm supposed to find out more today hopefully.

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[Tomato]

2 hours ago, DNHMIKE said:

Well after doing some research,  what I've come up with is that, the fuse box under the hood, is held together with 4 silver color bolts that are to be torque to 56 foot pounds. Mine were only maybe 10 foot pounds.  There is also a green color indicator by each bolt that tells if it is tight, it's green but there not tight! I hope this helps.

Inch-pounds!!!

[shadow gray 2020 hd]

This thread kind of raises a question, does it matter which battery you jump with the duramax 2 battery system?

[MTU Alum]

For those that have had dead batteries, did your infotainment screen go blank before your dead battery? 

 

#iworkforGM 

[Colossus]

I always jump the primary.