2019 Silverado radio and instrument cluster staying on. Can’t turn off keyless pushbutton switch. Intermittently

Peter Owner/Technician Michigan Posted   Latest   Edited  
Unsolved
Electrical
Programming
2019 Chevrolet Silverado 1500 High Country 6.2L (L L87) 8-spd (8L90)
Radio And Dash Won't Shut Off Intermittently
Dead Overnight
  • History: began occurring very intermittently, and then began to be more frequent.
  • Letting the vehicle run with the fob out of the vehicle leads to a complete shut down after 10 or so minutes. Then the vehicle behaves alright for a while, sometimes quite a while.
  • Figured BCM malfunction was a likely culprit based on research and experience of 2.5 days.
  • New BCM from dealer seemed to be programming ok until the progress bars were all filled and the message to turn the ignition off and on. It would not turn on to begin with. All accessories were black, and pushing the Start/Stop button had no effect.
  • Reinstalling the old BCM restored normal function (basically with the strangeness already mentioned).
  • Hours spent observing scan data and vehicle behavior patterns did not reveal any further clues.
  • The friendly dealer who provided the new BCM is going to defect it and let me try again.
  • Any contributions of thought or experience that may help in understanding this vehicle’s malady would be appreciated. I’ve been programming GM vehicles since removable PROMs and ain’t never seen anything like it.
  • I hope you’re having a better day.
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Missing Tests
Ali Diagnostician
Texas
Ali
 

Any codes? Even if history from the initial full scan.

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Peter Owner/Technician
Michigan
Peter
 

The only code present when initially presented was a B3110 (key fob battery low voltage). Changed out the battery. No more codes.

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Allan Owner
Virginia
Allan
   

Does it show its in park in the tcm, pcm and BCM when it acts up? Doesn’t see park won’t turn off.

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Peter Owner/Technician
Michigan
Peter
 

It shows it's in park on the PRNDL and the DIC when it's acting up or not. I never got a look at those PIDs when it was acting up. I just checked, but the truck chooses not to act up currently. If I get another chance when she's acting up, I'll check. Thank you.

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William Technician
Illinois
William
   

There is a TSB for this… #PIT5750A. Also, I would update the radio firmware via USB (make sure it is by USB flash drive as it is different from regular radio programming). Those radios have lots of software issues for staying on after RAP cancelation. I have my doubts that the BCM is faulty… it has so many inputs if one is wrong or a LIN is staying awake it would cause this.

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Peter Owner/Technician
Michigan
Peter
 

What you offer sure seems relevant to this truck's problem. I found the bulletin you've referenced. i'll look into it. Thank you.

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Cory Owner/Technician
Texas
Cory
 

Are there any solenoids installed under the hood by any chance? Or are there any signs of it being a fleet/work truck?

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Peter Owner/Technician
Michigan
Peter
 

This truck has no apparent mods under the hood or elsewhere. It also has been owned by a wealthy couple since new. Thank you for your input.

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Martin Instructor
British Columbia
Martin
 

Hi Peter. Conditions such as you mention can often be caused by network issues. I actually demonstrate one in class which causes the ignition not to be able to be turned off and exterior lights and more stay illuminated. Any DTCs, seemingly related or not? Did you check bulletins first? See #19-NA-228: Malfunction Indicator Lamp (MIL) Illuminated, Shift to Park Message on Drivers Information…

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Agree
Peter Owner/Technician
Michigan
Peter
 

I'm getting the message re communication issues causing weird problems from you and other posters, and thank you all. That bulletin you offer may be a fit. I'll look into that. As to trouble codes, the only one set when I received the vehicle was a B3110 low voltage fob battery which I corrected with a new battery. Thank you for your input.

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William Owner/Technician
Kentucky
William
 

Use a wiring diagram to check the fuses for the pcm, do they have any voltage on them with the key off? I recently had a gm that would get water leaking into a dash fuse box leaking voltage into a air bag ignition circuit, With the ignition relay removed there was voltage on the pcm fuse until removing the air bag fuse. Even when not acting up it might show 3 to 5 volts on the fuses with the key…

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Interesting
Peter Owner/Technician
Michigan
Peter
 

I'll look into the areas of concern you​.​ve brought to my attention. Thank you for your input.

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Rudy Technician
Utah
Rudy
 

Floors me how some of you guys just “figured” a part was bad and replace it. It would probably help to take a look at a wiring diagram and start from there. Input/outputs related to starting and running is a good place to start.

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Sid Technician
Ontario
Sid
 

Read an article on this on another forum, seems there is a micro switch in the steering column that may be causing the problem

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Peter Owner/Technician
Michigan
Peter
 

What forum would that be?

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Sid Technician
Ontario
Sid
 

gm-trucks​.​com/forums/topic/2…

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