Battery drain issue 16 Yukon Denali

[Zimmermann Danton]

Hi all. I have a 2016 Yukon Denali I just purchased recently with 71k miles for just about 2 weeks now. Test drive was great and vehicle drives great. 3-4 days after purchasing vehicle the battery was dead after sitting all day. Gave it a good slow charge thinking maybe the battery was low after sitting on the lot. Ran great for a couple of days and then dead battery again. Battery is new and tests good. Been having a major battery drain issue. Any suggestions or experience with this issue? Responses would be greatly appreciated!

[Russ Swift]

Any luck so far?  I’d like to what the problem was when you find it.  Thanx.

[Zimmermann Danton]

I haven’t figured it out yet. Some other odd things it does. When off, the fan in the dash will blow for about a minute intermittently. I also see the stereo screen and DIC screen light up. And the transmission control module has a high pitch noise coming from it. All when vehicle is off and locked.

[silveradosid]

this was for pickups but might be related to your yukon

MC-10154263-9999.pdf

[Ralph Watty]

Looking for help or feedback on a similar issue too.

I have a battery drain issue happening right now as well: 2017 Silverado 1500 RCSB 4wd (manual transfer case) WT. Among other electrical gremlins.  I think they may all be related to the BCM.  I'm currently in the process of troubleshooting. It has been raining and storming for several days, and my community just got hit with a tornado, so its hard to work on stuff in the driveway in between squalls.

 

Issues I'm having: battery drains after sitting for 3 days; front differential will not engage into 4wd; Steering is jerky - pulls right then left when accelerating or decelerating (I think electric power steering is over-reacting).

 

Troubleshooting so far:

1.) verified that transfer case is engaging properly. It is.

2.) checked to see if the front diff actuator is engaging the front diff. It is not.

3.) checked 4wd Trec fuse visually and with continuity test. It is perfect.

4.) performed amperage draw test at the battery negative terminal and found 5 amp draw with key off. 2.5 amp draw constant. 2.5 amp draw cycles on and off every minute or so.

5.) disconnected the 3 fuse boxes - under hood, left side, right side - to pinpoint which fuse box has the circuit drawing power. Right side fuse box is drawing 2.5 amps constant. Left side fuse box is cycling 2.5 amps on and off (Onstar?).

 

My next steps are to locate the 2.5 amp constant draw by pulling each fuse in the right fuse box and testing for current draw. When I locate the culprit I will report back. Or, if anyone has any feedback on what other things to look for, I'm open for ideas.

[Riklimoguy]

Man, my drain is different thank yours. But certainly aggravating to say the least!! I hope you’ve found the solution. 
if you can, take a look at my post!! I’d appreciate it!! 

[Russ Swift]

Check out this forum for a similar problem & comments posted by a Rick 2-3 days ago.  Som good info and suggestions

[gat0r]

On 6/7/2020 at 6:51 PM, Zimmermann Danton said:

I haven’t figured it out yet. Some other odd things it does. When off, the fan in the dash will blow for about a minute intermittently. I also see the stereo screen and DIC screen light up. And the transmission control module has a high pitch noise coming from it. All when vehicle is off and locked.

FYI, the fan blowing is called - afterblow.    GM enabled this to dry out the evaporator of the HVAC system... so it doesnt get a musty smell.

[Russ Swift]

Someone else on this site had a similar battery problem, turned out to be the starter motor and/or the connections to that motor.  Also speculated it was the reserve power system, the system that gives you about 15 minutes of power after you turn off the key, that goes fully off when you open the door.